JP2006109683A - Rotary electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotary electric machine that is improved in reliability at high rotation. <P>SOLUTION: In a magnet-embedded motor which is equipped with a stator 2, having winding wound around a plurality of teeth 7 and with a rotor 3 and uses reluctance torque, the rotor is equipped with a rotor core 11, having a plurality of magnet storage holes 16, 17 which are arranged in the peripheral direction and extending axially and with permanent magnets 18, 19, where each is embedded in the magnet storage holes. The rotor core 11 is provided with resin-filling portions 50, 51, 52 wherein a resin is filled in the space between the rotor core 11 and the permanent magnets 18, 19 that are embedded in each magnet storage hole 16, 17. Thereby, the permanent magnets 18, 19 are suppressed from moving in the magnet storage holes 16, 17 during the rotation of the magnet-embedded motor, preventing the permanent magnets from cracking or broken and the permanent magnets from projecting out. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a rotating electrical machine that uses reluctance torque, such as a motor that uses both magnet torque and reluctance torque, and a motor that uses only reluctance torque.

  Examples of motors that use reluctance torque include embedded magnet type motors that use both magnet torque and reluctance torque. The embedded magnet type motor includes a stator in which a winding is wound around a plurality of teeth arranged in the circumferential direction, and a rotor in which a plurality of permanent magnets are embedded in a magnet housing hole.

Conventionally, an embedded magnet type motor using a rotor as shown in FIG. 21 is known (for example, see Patent Document 1).
The rotor 140 shown in FIG. 21 is used for an internal rotation type interior magnet type motor. The rotor 140 is provided with a plurality of sets of two V-shaped magnet receiving holes 141 and 142 in the circumferential direction. Permanent magnets (not shown) are embedded in the two magnet housing holes 141 and 142 of each set. The two magnet housing holes 141 and 142 of each set are open on the air gap side (radially outer side) between the stator and the anti-air gap side (radially inner side) with the reinforcing bridge portion 143. The rotor 140 has a magnetic path forming portion 144 on the side closer to the air gap than the two magnet receiving holes 141 and 142 and other magnetic path forming on both sides of the two magnet receiving holes 141 and 142 of each set. Bridge portions 146 that connect the portions 145 are provided.

  Such an embedded magnet type motor is generated by reluctance torque generated by the magnetic flux generated by the stator passing through the rotor and the magnetic flux generated by the permanent magnet interlinks with the stator winding through the magnetic path forming portion 144. The magnet torque to be used is used as the motor torque.

On the other hand, a rotor structure of a synchronous motor using a rotor without a bridge portion is known (see, for example, Patent Document 2). In this rotor structure, as shown in FIG. 22, a plurality of magnets 151 magnetized in the circumferential direction and a plurality of laminated rotor cores 152 sandwiching each of the plurality of magnets 151 in the circumferential direction are alternately arranged around the shaft 153. It is arranged.
JP 2002-345189 A Japanese Patent Publication No.8-17543

  By the way, in the conventional embedded magnet type motor shown in FIG. 21, a part of the magnetic flux generated by each permanent magnet embedded in the two magnet housing holes 141 and 142 flows from the magnetic path forming portion 144 to the left and right bridge portions 146. Leakage magnetic flux is generated. As a result, the magnetic flux is closed in the rotor 140, and the magnetic flux of the permanent magnet cannot be used effectively. Therefore, the magnet torque is reduced by the amount of the leakage magnetic flux, and a high torque cannot be obtained. It was. Similarly, the magnetic flux generated by the stator that passes through the rotor in the above-described path may generate a leakage magnetic flux that partially flows through the bridge portion 146 to the magnetic path forming portion 144. In this case, there is a problem that the reluctance torque is reduced by the amount of the leakage magnetic flux, and a high torque cannot be obtained.

On the other hand, in the conventional rotor structure shown in FIG. 22, the rotor 1 of the embedded magnet type motor shown in FIG.
Since there is nothing to hold a permanent magnet like the bridge portion 146 at 40, there is a problem that it cannot cope with high rotation.

This invention is made | formed in view of such a situation, The objective is to provide the rotary electric machine which improved the reliability at the time of high rotation.
Another object of the present invention is to provide a rotating electrical machine that can reduce the leakage magnetic flux in the bridge portion to obtain a high torque and improve the reliability at the time of high rotation.

  In order to solve the above-mentioned problem, an invention according to claim 1 is a rotating electrical machine that uses a reluctance torque and includes a stator having a winding wound around a plurality of teeth arranged in a circumferential direction and a rotor. The rotor includes a rotor core having a plurality of magnet housing holes arranged in the circumferential direction and extending in the axial direction of the rotor, and a permanent magnet embedded in each of the plurality of magnet housing holes, and a gap between the rotor core and the permanent magnet The gist is that the resin is filled in.

  The “rotary electric machine using reluctance torque” here is used to include a rotary electric machine that uses only reluctance torque and a rotary electric machine that uses both reluctance torque and magnet torque.

  According to this, since the resin is filled in the gap between the rotor core and the permanent magnet embedded in each of the plurality of magnet housing holes, each permanent magnet moves within each magnet housing hole during the rotation of the rotor. It is suppressed. For this reason, it is possible to prevent the permanent magnet from cracking and chipping, and to prevent the permanent magnet from jumping out. Therefore, it is possible to realize a rotating electrical machine with improved reliability during high rotation.

  According to a second aspect of the present invention, there is provided a rotating electrical machine including a stator having a winding wound around a plurality of teeth arranged in a circumferential direction and a rotor, wherein the rotor is arranged in the circumferential direction. A rotor core having a plurality of magnet housing holes extending in the axial direction of the rotor, and a bonded magnet filling portion in which the plurality of magnet housing holes are filled with bond magnets, and the filled bond magnets are magnetized to form magnets. The gist is that the gap between the rotor core and the bonded magnet filling portion is filled with resin.

  According to this, each magnet accommodation hole of the rotor core is filled with a bond magnet, and each of the filled bond magnets is magnetized to form a magnet, and a resin is provided in the gap between the rotor core and the bond magnet filling portion. Therefore, it is suppressed that each bonded magnet filling part moves in each magnet accommodation hole during rotation of the rotor. For this reason, the bond magnet filling part can be prevented from cracking and chipping, and the bond magnet filling part can be prevented from popping out. Therefore, it is possible to realize a rotating electrical machine with improved reliability during high rotation.

  According to a third aspect of the present invention, in the rotating electrical machine according to the first or second aspect, the rotor core includes a magnetic path forming portion on the side closer to the magnet accommodation hole and an air gap between the stator and the other magnet. A plurality of bridge portions connected to the path forming portion, the plurality of bridge portions having a bridge cutting portion or a bridge cutting portion for making the thickness or cross-sectional area of each bridge portion smaller than that of the other portions. The gist is that the bridge cutting part or the bridge cutting part is filled with resin.

According to this, since the bridge cutting part or the bridge cutting part for making the thickness or the cross-sectional area of each bridge part smaller than the other part is provided, the magnetic resistance in each bridge part becomes large. Thereby, in the rotary electric machine which utilizes only reluctance torque, the amount of magnetic flux leakage by which the magnetic flux by a stator leaks through each bridge part can be reduced. In a rotating electrical machine that uses both reluctance torque and magnet torque, reduce both the amount of magnetic flux leakage that the magnetic flux from the stator leaks through each bridge part and the amount of magnetic flux leakage that the magnetic flux from the permanent magnet leaks through each bridge part. Can do. Therefore, the reluctance torque or both the reluctance torque and the magnet torque can be used effectively, and a high torque can be obtained.

  In addition, since the bridge cutting part or the bridge cutting part of the rotor core is filled with resin, it is possible to compensate for the strength reduction of the rotor core due to cutting or cutting a part of each of the plurality of bridge parts, and the outer periphery of the rotor core is It becomes a shape with higher roundness, and the air resistance at the time of rotor rotation can be reduced by the roundness.

  According to a fourth aspect of the present invention, in the rotating electrical machine according to the third aspect, the rotor core is rotatably accommodated inside the stator, and each of the plurality of magnet accommodation holes is provided for each magnetic pole. At least one magnet receiving hole continuous in the circumferential direction, and the plurality of bridge portions include a plurality of outer bridge portions provided for each of the magnetic poles on the outer peripheral side of the rotor core, The gist of the bridge portion on the outer peripheral side is to connect the magnetic path forming portion and the other magnetic path forming portion that are radially outward from the magnet receiving hole on both sides of the at least one magnet receiving hole. .

  According to this, in a rotary electric machine of a type having a bridge portion only on the outer peripheral side of the rotor, high torque can be obtained and the reliability of the rotary electric machine at high rotation can be increased.

  According to a fifth aspect of the present invention, in the rotating electrical machine according to the third aspect, the rotor core is rotatably accommodated inside the stator, and each of the plurality of magnet accommodation holes is circumferentially arranged for each magnetic pole. Two or more magnet housing holes provided independently along the outer periphery of the rotor core, and the plurality of bridge portions are provided on the outer peripheral side of the rotor core, and a plurality of outer peripheral bridge portions are provided for each of the magnetic poles. One or more reinforcing bridge portions that connect the two or more magnet housing holes, and the outer peripheral bridge portions of the magnetic poles are arranged on both sides of the two or more magnet housing holes. The gist is that the magnetic path forming part radially outside the hole is connected to the other magnetic path forming part.

  According to this, in the type of rotating electrical machine having a plurality of outer peripheral bridge portions for each magnetic pole and one or more reinforcing bridge portions connecting the two magnet housing holes of each magnetic pole, Both the amount of magnetic flux leakage leaking through the bridge portion on the side and the amount of magnetic flux leakage leaking through each reinforcing bridge portion can be reduced. Thereby, while being able to obtain a high torque, the reliability of the rotary electric machine at the time of high rotation can be improved.

  The invention according to claim 6 is the rotating electrical machine according to claim 5, wherein the two or more magnet housing holes of the magnetic poles have the air gap side opened and the anti-air gap side connected by the reinforcing bridge portion. The gist is to include two magnet housing holes arranged in a V shape.

  According to this, a high torque can be realized in an interior magnet type rotating electrical machine that is an inversion type and has a V-shaped permanent magnet and uses both reluctance torque and magnet torque.

  The invention according to claim 7 is the rotating electrical machine according to any one of claims 1 to 6, wherein the rotor core of the rotor is a laminated core in which a plurality of core sheets are laminated, and the plurality of core sheets are The gist is provided with a plurality of magnet housing holes forming a plurality of magnet housing holes and the plurality of bridge portions having the bridge cutting portions.

According to this, in a rotating electrical machine using a rotor core as a laminated core, high torque can be obtained and reliability at high rotation can be improved.
The invention according to claim 8 is the rotary electric machine according to claim 7, wherein the laminated core includes a plurality of bridge portions on the outer peripheral side provided for each of the magnetic poles on the outer peripheral side of the rotor core, and each of the magnetic poles. One type of core sheet obtained by cutting at least one of the one or more reinforcing bridge portions connecting the two or more magnet housing holes at a predetermined angle, and the axial direction of each of the bridge portions on the outer peripheral side. The thickness of each of the reinforcing bridge portions and the thickness in the axial direction of each of the reinforcing bridge portions are laminated so as to be shifted one by one or plural in the rotational direction of the rotor. Is the gist.

  According to this, the thickness of each of the outer peripheral bridge portions provided for each magnetic pole and the thickness of each of the one or more reinforcing bridge portions connecting two or more magnet housing holes of each magnetic pole are different. A laminated core that is smaller than this part can be produced easily and at low cost by using one kind of core sheet.

  The invention according to claim 9 is the rotating electrical machine according to claim 7, wherein the laminated core has the entire bridge portion on the outer peripheral side and a part or all of the reinforcing bridge portion is cut. Two or more types of core sheets including a core sheet and a second core sheet that has all of the reinforcing bridge portions and a part or all of the bridge portions on the outer peripheral side are cut into each of the bridge portions on the outer peripheral side. The thickness in the axial direction and the thickness in the axial direction of each of the reinforcing bridge portions are alternately stacked one by one or every plurality so that the thickness is smaller than the other portions. And

  According to this, the thickness of each of the outer peripheral bridge portions provided for each magnetic pole and the thickness of each of the one or more reinforcing bridge portions connecting two or more magnet housing holes of each magnetic pole are different. The laminated core made smaller than this part can be easily produced using two or more types of core sheets including the first core sheet and the second core sheet.

  The invention according to claim 10 is the rotating electrical machine according to any one of claims 7 to 9, wherein the rotor core that is the laminated core is configured such that each of the plurality of core sheets is shifted by a certain angle. The gist is that a core sheet is laminated and the magnet accommodation hole in which the magnet accommodation hole portion of each core sheet is continuously formed is twisted with respect to the rotation center of the rotor.

According to this, the cogging torque and the ripple are reduced, and the rotation unevenness of the rotor can be reduced.
The invention according to claim 11 is the rotating electrical machine according to any one of claims 7 to 10, wherein the rotor core, which is the laminated core, is filled with the resin in the gap at both ends in the axial direction. The gist is to include a plate-shaped resin-molded core end portion that is resin-molded integrally with the resin-filled portion.

  According to this, the rotor core is formed by resin molding integrally with the resin filling portion, and the plate-shaped resin molding core end portions provided at both end portions in the axial direction are arranged on both sides of the laminated core composed of a plurality of laminated core sheets. It has a structure to hold from. For this reason, the rivet used in order to hold down the core laminated conventionally can be abolished, and the number of parts can be reduced. Therefore, the manufacturing cost can be reduced.

According to a twelfth aspect of the present invention, in the rotating electrical machine according to the eleventh aspect, at least one of the two resin molded core end portions provided at both axial end portions of the rotor core is from the rotation center side of the rotor. The gist is to have a large number of fins formed radially toward the outer diameter side.

  According to this, an air-cooling effect can be provided when the rotor is rotated by a large number of fins formed on at least one end of the two resin-molded cores of the rotor core, thereby suppressing the heat generation of the rotor core and reducing the performance due to the heat generation. Can be suppressed.

  The invention according to claim 13 is the rotating electrical machine according to any one of claims 1 to 6, wherein the rotor core of the rotor is a powder core obtained by sintering a predetermined material, and the powder core is The gist is provided with the bridge cutting portion that is partially cut so that each of the plurality of bridge portions is not completely divided by the powder core and the cross-sectional areas of the plurality of bridge portions are equal to each other. To do.

According to this, since each bridge part is partially excised so that the powder core is not completely divided, a powder core (rotor core) having sufficient strength can be obtained.
The invention according to claim 14 is the rotating electrical machine according to claim 13, wherein the bridge cut portion of the powder core is a portion obtained by cutting both axial sides or one side of each of the plurality of bridge portions. The gist.

According to this, the powder core which made the cross-sectional area of each of the some bridge | bridging part smaller than another part can be produced.
The invention according to claim 15 is the rotating electrical machine according to claim 13, wherein the bridge cut portion of the powder core is a portion in which one or more holes are partially formed in an outer peripheral portion of each of the plurality of bridge portions. It is a summary.

  According to this, since one or more holes are partially opened in the outer peripheral portion of each bridge portion, a powder core (rotor core) having sufficient strength can be obtained.

  ADVANTAGE OF THE INVENTION According to this invention, the rotary electric machine which improved the reliability at the time of high rotation is realizable. In addition, it is possible to realize a rotating electrical machine that can reduce the leakage magnetic flux in the bridge portion and obtain a high torque, and improve the reliability at the time of high rotation.

  Embodiments of an embedded magnet motor embodying the present invention will be described below with reference to the drawings. In the description of each embodiment, similar parts are denoted by the same reference numerals, and redundant description is omitted.

(First embodiment)
The embedded magnet type motor according to the first embodiment will be described with reference to FIGS.
The embedded magnet type motor as a rotating electrical machine shown in FIG. 1 includes a housing 1, a stator 2 in which windings are wound around a plurality of teeth arranged in the circumferential direction, and a rotor 3, and includes magnet torque and reluctance. This is an adder motor that uses torque as rotational torque.

The feature of the embedded magnet type motor according to the present embodiment is that it has the following configuration.
The rotor 3 includes a rotor core 11 having a plurality of magnet housing holes arranged in the circumferential direction and extending in the axial direction of the rotor 3, and permanent magnets 18 and 19 embedded in the plurality of magnet housing holes 16 and 17, respectively. The gap between the rotor core 11 and the permanent magnets 18 and 19 is filled with resin.

The rotor core 11 includes a plurality of bridge portions 21 that connect the magnetic path forming portion 14 on the side closer to the magnet housing holes 16 and 17 to the air gap 13 between the stator 2 and the other magnetic path forming portion 15. . The plurality of bridge portions 21 have bridge cutting portions (openings) 21B and 21B for making each bridge portion 21 thinner (smaller) than other portions.

-Each bridge cutting part 21B is filled with resin.
As shown in FIG. 1, the housing 1 includes a bottomed cylindrical case 4 and a lid 5 that closes an opening of the case 4. The stator 2 is fixed to the inner peripheral surface of the case 4. The rotor 3 is rotatably accommodated inside the stator 2 by supporting the rotating shaft 6 by a bearing 4 a and a bearing 5 a provided on the case 4 and the lid 5, respectively.

  As shown in FIGS. 1 to 3, the stator 2 is formed in a cylindrical shape and includes a stator core 8 having a plurality of teeth 7 formed to extend toward the axis center at equal angles in the circumferential direction, and each tooth 7. And a winding 10 wound through an insulator 9. In addition, the stator of this embodiment is a 12-slot stator having 12 teeth 7. 2 and 3, illustration of the insulator 9 and the winding 10 is omitted. The winding 10 is wound around the tooth 7 by concentrated winding.

  As shown in FIGS. 1 and 2, the rotor 3 includes a rotating shaft 6, a rotor core 11, and two permanent magnets 18, 19 as one set, and eight sets of permanent magnets 18, arranged at equal angles in the circumferential direction. 19 is an 8-pole rotor. The rotor core 11 is a laminated core formed by laminating a plurality of disk-shaped core sheets (see FIGS. 3 and 4). In addition, illustration of the boundary line of a some core sheet | seat is abbreviate | omitted to the rotor core 11 of the rotor 3 shown in FIG. A central hole 11 a into which the rotary shaft 6 is fitted is formed at the axial center of the rotor core 11.

  2 and 3, the rotor core 11 of the rotor 3 includes eight sets (two in each circumferential direction, two in each magnetic pole, a total of 16) of magnet housing holes 16 and 17 and a plurality of ( 2 × 8 = 16) bridge portions 21. Two bridge portions (outer peripheral side bridge portions) 21 and 21 of each set (each magnetic pole) are air gaps between the stator 2 on both sides of the two magnet housing holes 16 and 17 of each set (each magnetic pole). 13 is connected to the eight magnetic path forming portions 14 on the side closer to the magnet housing holes 16 and 17 and the other magnetic path forming portions 15.

  In the rotor core 11, since the outer peripheral bridge portion 21 is formed in each of the 16 magnet housing holes 16, 17, the rotor core 11 is provided with 16 bridge portions 21 as a whole. That is, the rotor core 11 is provided with two bridge parts (outer bridge parts) 21 and 21 every 180 ° (each magnetic pole) in electrical angle in the case of three-phase driving.

  The “air gap 13” is formed at the tip end portion (rotation center side end portion) of each tooth 7 of the stator 2, and the inner peripheral surface of the tip portion 7 a having a wide width in the circumferential direction and the outer peripheral surface of the rotor core 11. It is a gap that can be made between each.

The rotor core 11 of the rotor 3 has a configuration in which the thickness of each of the plurality of outer peripheral bridge portions 21 is made thinner than the other portions.
As shown in FIGS. 2 and 3, the two magnet housing holes 16, 17 of each magnetic pole are opened on the air gap 13 side (radially outer side) and on the opposite air gap side (radially inner side) with a reinforcing bridge portion 23. It has a connected V-shaped arrangement. Two permanent magnets 18 and 19 are embedded in the two magnet housing holes 16 and 17 of each magnetic pole.

Each of the permanent magnets 18 and 19 has a rectangular parallelepiped shape, and both end portions in the axial direction of the rotor 3 are magnetic poles. And the two permanent magnets 18 and 19 of each magnetic pole, as shown in FIG.
In the same set, the end portions of the same magnetic pole are arranged, and in the adjacent set, the end portions of different magnetic poles are embedded. That is, two permanent magnets 18 and 19 in one set have N pole ends, and two permanent magnets 18 and 19 of each magnetic pole on both sides thereof have S pole ends aligned. Eight sets of permanent magnets, one set of the permanent magnets 18 and 19, are arranged. Thus, the 8-pole rotor 3 is configured.

  The eight magnetic path forming portions 14 are triangular magnetic regions formed between two V-arranged magnet receiving holes 16 and 17. The other magnetic path forming portion 15 is a magnetic region formed radially inward from the eight sets of magnet housing holes 16 and 17.

  As described above, the embedded magnet type motor according to the present embodiment has eight sets of magnets embedded in the eight sets of magnet housing holes 16 and 17 that are V-shaped independently along the circumferential direction for each magnetic pole. Permanent magnets 18 and 19 are included. In addition, the rotor 3 has a plurality of bridge portions, 16 outer peripheral side bridge portions 21 provided two for each magnetic pole on the outer peripheral side, and two magnet housing holes 16 and 17 of each magnetic pole. Eight reinforcing bridge portions 23 for connecting the two are provided. The bridge portions 21 and 21 on the outer peripheral side of each magnetic pole include magnetic path forming portions 14 and other magnetic path forming portions 15 that are radially outward from the magnet receiving holes on both sides of the two magnet receiving holes 16 and 17. Connected.

  One of the features of the embedded magnet type motor according to the present embodiment is that, as described above, the thickness of each of the plurality of outer peripheral side bridge portions 21 in the rotor core 11 of the rotor 3 is made thinner than the other portions. is there. In order to obtain this configuration, as a plurality of (in this example, 16) disk-shaped core sheets constituting the rotor core 11 which is a laminated core, the 16 outer peripheral side bridge portions 21 are cut at every electrical angle of 360 °. One kind of core sheet 25 (see FIG. 5) is used.

  In this core sheet 25, as shown in FIG. 5, two bridge portions 21A and 21A and two bridge cut portions (openings) 21B and 21B formed by cutting the two bridge portions have an electrical angle of 180 °. It is provided alternately every time. As shown in FIGS. 6A and 6B, the sixteen core sheets 25 having such a shape have the same thickness of each of the sixteen outer peripheral bridge portions 21 in the rotor core 11 and other portions. The rotor core 11 is configured by laminating one sheet at a time by an electrical angle of 180 ° in the rotation direction of the rotor 3 so as to be thinner (see FIG. 4). The “thickness of each bridge portion 21” refers to the thickness of the rotor core 11 in the axial direction (direction perpendicular to the paper surface in FIG. 3).

  By laminating each core sheet 25 with an electrical angle of 180 ° shifted in the rotational direction of the rotor 3, the two bridge portions 21A and 21A and the two bridge cutting portions 21B and 21B in the laminated core sheets 25 coincide with each other. (See FIGS. 6A and 6B). In the rotor core 11 manufactured as described above, the thickness of each of the 16 bridge portions 21 is thinner than the other portions.

  Moreover, in this rotor core 11, as can be seen from FIG. 6 (a), the magnet housing holes 16a and 17a (see FIG. 5) of the 16 core sheets 25 (only 4 are shown in the figure). The magnet receiving holes 16 and 17 formed continuously are rectangular parallelepiped spaces extending parallel to the rotation center of the rotor 3 so that the rectangular parallelepiped permanent magnets 18 and 19 can be accommodated.

In the magnet-embedded motor of this example, as shown in FIGS. 2 to 4, the gap between the rotor core 11 and the permanent magnets 18 and 19 is filled with resin.
There are the following three types of gaps between the rotor core 11 and the permanent magnets 18 and 19.

(1) In the rotor core 11, a gap formed between the outer end portions (radially outer end portions) of the two permanent magnets 18 and 19 of each magnetic pole and each bridge portion 21 </ b> A of the 16 core sheets 25. The portion where the gap is filled with resin is the resin filling portion 50 (see FIGS. 2 to 4).

  (2) In the rotor core 11, gaps formed between the inner ends (radially inner ends) of the two permanent magnets 18 and 19 of each magnetic pole and the eight reinforcing bridge portions 23 of the 16 core sheets 25. . A portion in which the gap is filled with resin is a resin filling portion 51 (see FIGS. 2 to 4).

  (3) A gap formed in each bridge cutting portion 21 </ b> B in the rotor core 11. That is, in the rotor core 11, a gap formed between the outer end portions of the two permanent magnets 18 and 19 of each magnetic pole and the bridge cutting portions 21 </ b> B of the 16 core sheets 25. A portion in which the gap is filled with resin is a resin filling portion 52.

In addition, as resin of the said resin filling part 50,51,52, various resins, such as thermoplastic resins, such as thermosetting resins, such as an epoxy resin, and ABS resin, can be used, for example.
In FIGS. 6A and 6B, only four core sheets 25 out of the 16 core sheets 25 are shown to simplify the illustration. 2 to 6, reference numeral 26 denotes a rivet (not shown) when the rotor core 11 is manufactured by laminating a plurality of core sheets 25 and then fixing these core sheets 25 by rivet caulking. It is a through hole provided in each core sheet 25 for insertion.

According to 1st Embodiment comprised as mentioned above, there exist the following effects.
(A) The rotor core 11 includes resin-filled portions 50, 51, 52 in which the gaps between the rotor core 11 and the permanent magnets 18, 19 embedded in the two magnet housing holes 16, 17 of each magnetic pole are filled with resin. Is provided. For this reason, the permanent magnets 18 and 19 are restrained from moving in the magnet housing holes 16 and 17 during rotation of the embedded magnet type motor, and the permanent magnets are prevented from cracking and chipping. Can be prevented. Therefore, it is possible to realize an embedded magnet type motor with improved reliability at high rotation.

  (B) Since the bridge cutting portion 21B is provided in each of the plurality of bridge portions 21 of the rotor core 11 and the thickness of each bridge portion 21 is made thinner than the other portions, the magnetic resistance in each bridge portion 21 is increased. Thereby, both the amount of magnetic flux leakage by which the magnetic flux by the stator 2 leaks through each bridge part 21 and the amount of magnetic flux leakage by which the magnetic flux by the permanent magnets 18 and 19 leaks through each bridge part 21 can be reduced. Therefore, both reluctance torque and magnet torque can be used effectively, and high torque can be obtained (see FIG. 20).

  FIG. 20 shows torque characteristics when the conventional embedded magnet type motor shown in FIG. 21 and the embedded magnet type motor according to the first embodiment are driven with the same exciting current. In FIG. 20, a curve 31 indicates a torque obtained by a conventional embedded magnet type motor, and a curve 32 indicates a torque of the embedded magnet type motor according to the present embodiment. In addition, the torque shown by each curve 31 and 32 has shown the torque which added reluctance torque and magnet torque.

As can be seen from FIG. 20, the embedded magnet type motor according to the present embodiment can obtain a higher torque than the conventional embedded magnet type motor.
(C) Accordingly, it is possible to realize an embedded magnet type motor that can reduce the leakage magnetic flux in each bridge portion 21 and obtain a high torque, and improve the reliability at the time of high rotation.

(D) Since the rotor core 11 has the resin filling portions 52 in which the bridge cutting portions 21B are filled with resin, the rotor core 11 compensates for the strength reduction of the rotor core 11 caused by cutting a part of each of the plurality of outer peripheral side bridge portions 21. be able to.

  (E) Since the rotor core 11 is provided with the resin filling portions 52 in which the bridge cutting portions 21B are filled with the resin, the outer periphery of the rotor core 11 has a more round shape, and the roundness makes it possible to rotate the motor. The air resistance can be reduced.

  (F) The rotor 3 is rotatably housed inside the stator 2. The two permanent magnets 18 and 19 of the magnet accommodation holes 16 and 17 of each magnetic pole have the same magnetic pole ends aligned in the same set of magnet accommodation holes 16 and 17 and adjacent sets of the magnet accommodation holes 16. , 17 are embedded so that the ends of the different magnetic poles are aligned. With such a configuration, a high torque can be realized in an embedded magnet type motor that uses an inversion type and has a V-shaped permanent magnet and uses both reluctance torque and magnet torque.

(G) In the embedded magnet type motor using the rotor core 11 of the rotor 3 as a laminated core, high torque can be obtained and the reliability at high rotation can be improved.
(H) As a plurality of core sheets constituting the rotor core 11, two bridge portions 21A and 21A and two bridge cut portions 21B and 21B formed by cutting the two bridge portions are alternately arranged at every electrical angle of 180 °. One type of core sheet 25 provided in the above is used. The core sheets 25 are stacked by being shifted by one electrical angle of 180 ° in the rotation direction of the rotor 3 so that the thicknesses of the bridge portions 21 in the rotor core 11 in the axial direction are equal and thinner than other portions. Thus, the rotor core 11 is configured. Therefore, a laminated core in which the thickness of each bridge portion 21 is made thinner than other portions can be easily produced at a low cost by using one kind of core sheet 25.

  (Li) After laminating a plurality of core sheets 25, the core sheets 25 are fixed by rivet caulking to produce the rotor core 11, whereby the strength of the rotor core 11 can be improved.

(Second Embodiment)
Next, an embedded magnet type motor according to a second embodiment will be described with reference to FIG.
FIG. 7 shows a rotor 3A of an embedded magnet type motor according to the second embodiment.

  The rotor core 11A of the rotor 3A is a laminated core having the same configuration as the rotor core 11 of the interior magnet type motor according to the first embodiment shown in FIG. 4, and resin filled portions 50, 51, 52, plate-like resin-molded core end portions 60 and 61 molded integrally with resin.

The rotor core 11A is a laminated core obtained by laminating 16 kinds of core sheets 25 (see FIG. 5) by the same laminating method as the rotor core 11 shown in FIG.
The plate-shaped resin-molded core end portions 60 and 61 of the rotor core 11A are filled with resin in the gaps (the above-described three types of gaps) between the rotor core 11A and the permanent magnets 18 and 19, respectively. When resin molding is performed, the resin filling portion is integrally molded with the resin filling portion up to both ends in the axial direction.

Other configurations of the interior magnet type motor according to the present embodiment are the same as those of the interior magnet type motor according to the first embodiment.
According to 2nd Embodiment comprised as mentioned above, in addition to the effect (a)-(h) which there exists the said 1st Embodiment, there exist the following effects.

The rotor core 11A of the rotor 3A is 16 sheets in which plate-shaped resin-molded core end portions 60 and 61 provided at both end portions in the axial direction are molded integrally with the resin filling portions 50, 51 and 52, respectively. The laminated core composed of the core sheet 25 is pressed from both sides. For this reason, the rivet used in order to hold down the core laminated conventionally can be abolished, and the number of parts can be reduced. Therefore, the manufacturing cost can be reduced.

(Third embodiment)
Next, an embedded magnet type motor according to a third embodiment will be described with reference to FIG.
FIG. 8 shows a rotor 3B of the interior magnet type motor according to the third embodiment.

  The rotor core 11B of the rotor 3B has resin molded core end portions 60B and 61B similar to the resin molded core end portions 60 and 61 of the rotor core 11A of the embedded magnet type motor according to the second embodiment shown in FIG. Each of these two resin-molded core end portions 60B and 61B is formed with a large number of fins 62 radially from the rotation center side to the outer diameter side of the rotor 3B.

According to 3rd Embodiment comprised as mentioned above, in addition to the effect which the said 2nd Embodiment show | plays, there exist the following effects.
○ A large number of fins 62 respectively formed on the two resin-molded core end portions 60B and 61B of the rotor core 11B can provide an air cooling effect when the rotor 3B rotates, suppressing heat generation of the rotor core 11B, The decrease can be suppressed.

(Fourth embodiment)
Next, an embedded magnet type motor according to a fourth embodiment will be described with reference to FIGS.
FIG. 9 shows a rotor 3C of the interior magnet type motor according to the fourth embodiment.

  In this embedded magnet type motor, the rotor core 11C of the rotor 3C is formed by stacking 16 first core sheets 35 shown in FIG. 10 and 16 second core sheets 45 shown in FIG. 11 alternately as shown in FIG. It is a core. Other configurations are the same as those of the rotor core 11 of the interior magnet type motor according to the first embodiment shown in FIG.

  The first core sheet 35 has a plurality of (2 × 8 = 16) outer peripheral bridge portions 21A and a shape in which all of the reinforcing bridge portions 23 are cut. As shown in FIG. 10, the first core sheet 35 is provided with two bridge portions 21 </ b> A and 21 </ b> A at eight locations every electrical angle of 180 °.

  On the other hand, the 2nd core sheet 45 has the shape which has all the reinforcement bridge parts 23, and cut | disconnected all the bridge parts 21A of the outer peripheral side. In the second core sheet 45, as shown in FIG. 11, two bridge cutting portions (openings) 21B and 21B formed by cutting two bridge portions are provided at eight positions every electrical angle of 180 °. Yes. In addition, the second core sheet 45 is provided with all of the reinforcing bridge portions 23 that connect the opposite air gap side (radially inner side) of the two magnet housing holes 16 and 17 of the V-shaped arrangement at each magnetic pole. Yes.

  The rotor core 11C includes two types of core sheets 35 and 45, one by one so that the thicknesses in the axial direction of the bridge portions 21 and the reinforcing bridge portions 23 on the outer peripheral sides are thinner than the other portions. A plurality of sheets (16 sheets) are alternately stacked. That is, in the two types of core sheets 35 and 45, as shown in FIGS. 12A and 12B, the bridge portions 21A of the core sheet 35 and the bridge cutting portions 21B of the core sheet 45 are respectively matched. A plurality of sheets are alternately laminated for each sheet so that the portion without the reinforcing bridge portion 23 of the core sheet 35 and the reinforcing bridge portion 23 of the core sheet 45 coincide with each other. FIGS. 12A and 12B show a state in which two types of core sheets 35 and 45 are stacked in order to simplify the illustration.

  Further, in this rotor core 11C, as can be seen from FIG. 12 (a), the magnet housing holes 16a and 17a (see FIGS. 10 and 11) of 16 (four in the figure) core sheets 35 and 45 are provided. The continuously formed magnet housing holes 16 and 17 are rectangular parallelepiped spaces extending parallel to the rotation center of the rotor 3C so that the rectangular parallelepiped permanent magnets 18 and 19 can be accommodated.

  Further, the rotor core 11C of the magnet-embedded motor of this example is similar to the rotor core 11 of the first embodiment shown in FIG. 4 in that the resin filling portion in which the gap between the rotor core 11C and the permanent magnets 18 and 19 is filled with resin. 50, 51, 52.

Other configurations of the rotor 3C of the embedded magnet type motor according to the present embodiment are the same as those of the rotor 3 of the embedded magnet type motor according to the first embodiment.
According to 4th Embodiment comprised as mentioned above, in addition to the effect (a)-(g) and (li) which there exists the said 1st Embodiment, there exist the following effects.

  A rotor core 11A in which the thickness of the bridge portion 21 on each outer peripheral side is made thinner than other portions, a first core sheet 35 having all the bridge portions 21A and cutting all the reinforcing bridge portions 23, and reinforcement It can be easily manufactured by using two types of core sheets, ie, the second core sheet 45 having all of the bridge portions 23 and cutting all of the bridge portions 21A.

  The rotor core 11A is formed by alternately stacking the first core sheet 35 (see FIG. 7) and the second core sheet 45 (see FIG. 8) as shown in FIGS. Configured. Accordingly, not only the thickness of each of the plurality of bridge portions 21 on the outer peripheral side in the rotor core 11A of the rotor 3 but also the thickness of each of the plurality of reinforcement bridge portions 23 is thinner than the other portions. The amount of magnetic flux leakage leaking through can also be reduced. Therefore, higher torque can be obtained.

(Fifth embodiment)
Next, an embedded magnet type motor according to a fifth embodiment will be described with reference to FIG.
FIG. 13 shows a rotor 3D of the interior magnet type motor according to the fifth embodiment.

  In the rotor core 11D of the rotor 3D, instead of embedding the permanent magnets 18 and 19 in the respective magnet housing holes 16 and 17 as in the first embodiment, the magnets are filled with bonded magnets, and the filled bonded magnets are attached. Bond magnet filling portions 180 and 190 which are magnetized to be magnets are provided.

The bond magnet used here is, for example, a ferrite bond magnet, an Nd—Fe—B bond magnet, an Sm—Fe—N rare earth bond magnet, or the like.
The rotor core 11D is provided with a total of 16 bonded magnet filling portions 180 and 190, two for each magnetic pole, like the permanent magnets 18 and 19 of the rotor core 11 shown in FIG. Further, as shown in FIG. 13, the two bonded magnet filling portions 180 and 190 of each magnetic pole are magnetized in the same manner as the permanent magnets 18 and 19 of the rotor core 11 shown in FIG.

  Further, the rotor core 11D of the embedded magnet type motor of this example is a resin in which a resin is filled in the gap between the rotor core 11D and the bonded magnet filling portions 180 and 190, similarly to the rotor core 11 of the first embodiment shown in FIG. It has filling parts 50, 51, 52.

Other configurations of the rotor 3D of the embedded magnet type motor according to the present embodiment are the same as those of the rotor 3 of the embedded magnet type motor according to the first embodiment.
According to 5th Embodiment comprised as mentioned above, in addition to the effect (b)-(li) which there exists the said 1st Embodiment, there exist the following effects.

  The rotor 3D is provided with bond magnet filling portions 180 and 190 that fill the magnet housing holes 16 and 17 of the rotor core 11D with bond magnets and magnetize the filled bond magnets to form magnets. And the gap between the bonded magnet filling portions 180 and 190 are filled with resin. For this reason, it is suppressed that each bonded magnet filling part 180,190 moves within each magnet accommodation hole 16,17 during rotation of rotor 3D. For this reason, it is possible to prevent the bond magnet filling parts 180 and 190 from being cracked and chipped, and to prevent the bond magnet filling parts 180 and 190 from jumping out. Therefore, it is possible to realize an embedded magnet type motor with improved reliability at high rotation.

(Sixth embodiment)
Next, an embedded magnet type motor according to a sixth embodiment will be described with reference to FIGS.

FIG. 14 is a perspective view showing a rotor 3E of an embedded magnet type motor according to the sixth embodiment, and FIG. 15 is a plan view showing the rotor 3E.
The rotor core 11E of the rotor 3E includes a plurality (16) of one type of core sheet 25 shown in FIG. 5 in the same manner as the rotor core 11 of the embedded magnet type motor according to the first embodiment shown in FIGS. It is a laminated core.

  In the rotor core 11, as described above, the magnet housing holes 16, 17 formed continuously from the magnet housing holes 16 a, 17 a (see FIG. 5) of the 16 core sheets 25 are formed as the rectangular parallelepiped permanent magnet 18, 19 is a rectangular parallelepiped space extending in parallel to the rotation center of the rotor 3 (see FIG. 6A).

  On the other hand, in the rotor core 11E of the present embodiment, the 16 core sheets 25 are laminated while being shifted by a certain angle, so that the magnet housing holes 16a and 17a (see FIG. 5) of each core sheet 25 are formed. The magnet housing holes 160 and 170 formed continuously have a structure twisted with respect to the rotation center of the rotor 3E.

  Note that “16 core sheets 25 are stacked while being shifted by a predetermined angle” means that the core sheets 25 are stacked by rotating each core sheet 25 by a fixed angle with respect to the rotation center of the rotor 3E. The fixed angle is an optimum angle at which cogging torque and ripple are reduced most.

  In FIG. 14, one of the 16 magnet housing holes 160, 170 (magnet housing hole 160) provided in the rotor core 11E, 2 for each magnetic pole, in total with respect to the rotation center of the rotor 3E. The twisted structure is shown in perspective. FIG. 15 is a plan view showing a structure in which one magnet housing hole 160 is twisted with respect to the rotation center of the rotor 3E.

According to 6th Embodiment comprised as mentioned above, in addition to the effect which the said 5th Embodiment shown in FIG. 13 show | plays, there exist the following effects.
In the rotor core 11E, the magnet accommodation holes 160 and 170 in which the magnet accommodation holes 16a and 17a of the plurality of core sheets 25 are continuously formed have a structure twisted with respect to the rotation center of the rotor 3E. Cogging torque and ripple can be reduced, and uneven rotation of the rotor 3E can be reduced.

(Seventh embodiment)
Next, an embedded magnet type motor according to a seventh embodiment will be described with reference to FIGS.
FIG. 16 is a perspective view showing a rotor 3F of an embedded magnet type motor according to the seventh embodiment, and shows a state in which permanent magnets 18 and 19 are embedded in a plurality of magnet housing holes 16 and 17, respectively. FIG. 16 is a plan view showing the rotor 3F, and shows a state in which the permanent magnets 18 and 19 are not embedded in the plurality of magnet housing holes 16 and 17, respectively.

  As shown in FIGS. 16 to 18, the embedded magnet type motor according to the present embodiment has a cross-sectional area of each of the plurality of outer peripheral bridge portions 21 and a cross-sectional area of each of the plurality of reinforcing bridge portions 23. A rotor 3F that is smaller than the portion is provided. The rotor core 11F of the rotor 3F is composed of a powder core obtained by sintering a predetermined material.

  In this rotor core 11F (powder rotor), in order to make the cross-sectional area of each bridge portion 21 and each reinforcing bridge portion 23 smaller than the other portions, each bridge portion 21 and each reinforcing bridge portion 23 are completely formed by the rotor core 11F. The bridge portions 21 and the reinforcing bridge portions 23 are partially cut away so that the cross-sectional areas are equal to each other.

  In this embodiment, the axial direction both sides of each bridge part 21 in the rotor core 11F are excised with the same depth, and the cross-sectional area of each bridge part 21 is made smaller than other parts. That is, grooves 21C (see FIG. 16) having the same depth are provided on both axial sides of each bridge portion 21 in the rotor core 11F. Further, both axial sides of each reinforcing bridge portion 23 in the rotor core 11F are cut at the same depth as shown in FIG. 18 so that the cross-sectional area of each reinforcing bridge portion 23 is smaller than the other portions. That is, grooves 23C having the same depth are provided on both sides in the axial direction of each reinforcing bridge portion 23 in the rotor core 11F.

  Similarly to the first embodiment, the rotor core 11F of the rotor 3 includes two V-arranged magnet housing holes 16 and 17 provided at eight equal angles in the circumferential direction, and each magnet housing hole 16, Two permanent magnets 18 and 19 embedded in 17 are provided.

In the magnet-embedded motor of this example, as shown in FIG. 16, the gap between the rotor core 11F and the permanent magnets 18 and 19 is filled with resin.
There are the following two types of gaps between the rotor core 11F and the permanent magnets 18 and 19.

  (1) A gap formed between the rotor core 11F and the inner ends of the two permanent magnets 18 and 19 of each magnetic pole (the radially inner end of the rotor core 11F). The portion where the gap is filled with resin is the resin filling portion 70 (see FIG. 16). The resin filling portion 70 fills a groove 23 </ b> C that is a bridge cut portion in which both sides in the axial direction of each reinforcing bridge portion 23 are cut at the same depth (see FIG. 16).

  (2) A gap formed between the rotor core 11F and the outer ends (the radially inner ends of the rotor core 11F) of the two permanent magnets 18 and 19 of each magnetic pole. A portion where the gap is filled with resin is a resin filling portion 71 (see FIG. 16). This resin filling portion 71 fills a groove 21C (see FIGS. 16 and 17) which is a bridge cut portion obtained by cutting the both sides in the axial direction of each bridge portion 21 in the rotor core 11F at the same depth.

According to 7th Embodiment comprised as mentioned above, there exist the following effects.
The rotor core 11F is provided with resin filling portions 70 and 71 in which the gap between the rotor core 11F and the permanent magnets 18 and 19 is filled with resin. For this reason, the permanent magnets 18 and 19 are restrained from moving in the magnet receiving holes 16 and 17 during rotation of the embedded magnet type motor, and the permanent magnets are prevented from cracking and chipping. Can be prevented. Therefore, it is possible to realize an embedded magnet type motor with improved reliability at high rotation.

O Since the cross-sectional area of each of the plurality of bridge portions 21 in the rotor core 11F of the rotor 3 is smaller than the other portions, the magnetic resistance in each bridge portion 21 is increased. At the same time, since the cross-sectional area of each of the plurality of reinforcing bridge portions 23 in the rotor core 11F is made smaller than the other portions, the magnetic resistance in each reinforcing bridge portion 23 is also increased. Thereby, both reluctance torque and magnet torque can be used effectively, and high torque can be obtained.

  Therefore, it is possible to realize an embedded magnet type motor that can reduce the leakage magnetic flux in each bridge portion 21 to obtain a high torque and improve the reliability at the time of high rotation.

A high torque can be realized in an embedded magnet type motor that uses an inversion type and has a V-shaped permanent magnet and uses both reluctance torque and magnet torque.
In the embedded magnet type motor in which the rotor core 11F of the rotor 3 is a powder core, high torque can be obtained and the reliability at high rotation can be improved.

Since each bridge portion 21 is partially cut away so that the rotor core 11F is not completely divided, the rotor core 11F having sufficient strength can be obtained.
○ By cutting off both sides in the axial direction of each bridge portion 21 on the outer peripheral side and both sides in the axial direction of each reinforcing bridge portion 23 at the same depth, the cross-sectional area of each bridge portion 21 and each reinforcing bridge portion 23 The rotor core 11F having a smaller cross-sectional area than other portions can be manufactured.

(Eighth embodiment)
Next, an embedded magnet type motor according to an eighth embodiment will be described with reference to FIG.
As shown in FIG. 19, the interior magnet type motor according to the present embodiment includes a rotor 3 </ b> G in which the cross-sectional area of each of a plurality of bridge parts (outer bridge parts) 21 is smaller than the other parts. The rotor core 11G of the rotor 3G is composed of a powder core obtained by sintering a predetermined material.

  In this rotor core 11G (powder rotor), in order to make the cross-sectional area of each bridge portion 21 smaller than the other portions, each bridge portion 21 is separated from each other so that the rotor core 11G is not completely divided. Partially cut out so that the areas are equal.

  In the present embodiment, a plurality of (in this example, five) holes 21D are formed in the outer peripheral portion of each bridge portion 21 in the rotor core 11G, so that the cross-sectional area of each bridge portion 21 is smaller than the other portions. . In the outer peripheral portion of each bridge portion 21, five holes 21D are formed at an equal pitch. These holes 21D have the same shape and the same size.

  Similarly to the first embodiment, the rotor core 11G of the rotor 3 has two V-arranged magnet accommodation holes 16 and 17 provided at equal angles in the circumferential direction, and each magnet accommodation hole 16, Two permanent magnets 18 and 19 embedded in 17 are provided.

In the magnet-embedded motor of this example, as shown in FIG. 19, the gap between the rotor core 11G and the permanent magnets 18 and 19 is filled with resin.
There are the following two types of gaps between the rotor core 11G and the permanent magnets 18 and 19.

(1) A gap formed between the rotor core 11G and the outer ends of the two permanent magnets 18 and 19 of each magnetic pole. A portion where the gap is filled with resin is a resin filling portion 80.
(2) A gap formed between the rotor core 11G and the inner ends of the two permanent magnets 18 and 19 of each magnetic pole. A portion where the gap is filled with resin is a resin filling portion 81.

In addition, the resin is filled in the gaps (concave portions) in the plurality of holes 21 </ b> D which are bridge cut portions opened in the outer peripheral portion of each bridge portion 21 in the rotor core 11 </ b> G. A portion where the gap is filled with resin is a resin filling portion 82.

According to 8th Embodiment comprised as mentioned above, there exist the following effects.
As in the seventh embodiment, it is possible to realize an embedded magnet type motor with improved reliability at high rotation, and to effectively use both reluctance torque and magnet torque. Torque can be obtained. Therefore, it is possible to realize an embedded magnet type motor that can reduce the leakage magnetic flux in each bridge portion 21 and obtain a high torque and improve the reliability at the time of high rotation.

A high torque can be realized in an embedded magnet type motor that uses an inversion type and has a V-shaped permanent magnet and uses both reluctance torque and magnet torque.
In the embedded magnet type motor using the rotor core 11G as a powder core, high torque can be obtained and the reliability at high rotation can be improved as in the seventh embodiment.

  A rotor core 11G in which the cross-sectional area of each bridge portion 21 is smaller than the other portions can be produced by opening a plurality (five) holes 21D in the outer peripheral portion of each bridge portion 21 in the rotor core 11G.

O Since the holes 21D are partially opened in the outer peripheral portion of each bridge portion 21, a rotor core 11G having sufficient strength can be obtained.
In addition, this invention can also be changed and embodied as follows.

  In each of the embodiments described above, an embedded magnet motor that uses both reluctance torque and magnet torque has been described as an example of a rotating electrical machine that uses reluctance torque. However, the present invention is also applicable to a reluctance motor that uses only reluctance torque. Is possible.

  In each of the above-described embodiments, an internal rotation type embedded magnet type motor has been described as an example of a rotating electrical machine. However, the present invention can also be applied to an external rotation type embedded magnet type motor or a reluctance motor.

  In each of the above embodiments, as an example of a rotating electrical machine, an embedded magnet type motor in which a plurality of permanent magnets arranged in a circumferential direction on a rotor is V-shaped has been described. However, the present invention is also applicable to an embedded magnet type motor including a rotor in which a plurality of permanent magnets having an arbitrary shape such as a linear shape, an arc shape, or a U shape are arranged in the circumferential direction.

  In each of the above embodiments, the rotor 3 connects the two magnet housing holes 16 and 17 provided independently along the circumferential direction for each magnetic pole and the two magnet housing holes 16 and 17 of each magnetic pole. The configuration including one reinforcing bridge portion 23 is described as an example. However, according to the present invention, the rotor is provided with two or more magnet accommodation holes provided independently along the circumferential direction for each magnetic pole, and two or more magnet accommodation holes provided for each magnetic pole. The present invention can also be applied to a motor including one or more reinforcing bridge portions that connect each other.

  In each of the above embodiments, the thickness or cross-sectional area of each of the bridge portions on the outer peripheral side and the thickness or cross-sectional area of each of the reinforcing bridge portions may be the same or different. However, it is desirable that the thickness or the cross-sectional area of each bridge portion on the outer peripheral side is equal, and that the thickness or the cross-sectional area of each reinforcing bridge portion is equal.

In each of the embodiments described above, the embedded magnet type motor including the 12-slot stator and the 8-pole rotor 3 has been described. However, the embedded magnet type motor in which the number of stator slots and the number of rotor poles are appropriately changed. In addition, the present invention is applicable.

  In the first embodiment, the resin is filled in all the three kinds of gaps described above, but in the rotor core 11, the outer end portions of the two permanent magnets 18 and 19 of each magnetic pole and the bridge portion of each core sheet 25. The present invention can also be applied to a configuration in which a gap formed between 21A is not filled with resin. That is, there may be a configuration in which there is no resin filling portion 50 and a gap that is formed between the outer end portions of the two permanent magnets 18 and 19 of each magnetic pole and the bridge portion 21A of each core sheet 25 remains as it is. Such a configuration is allowed when the permanent magnets 18 and 19 are pushed radially outward by the resin in the resin filling portion 51 so that they do not move in the magnet housing holes 16 and 17 at the time of high rotation.

  In the second embodiment, the configuration in which the plate-shaped resin-molded core end portions 60 and 61 are provided in the laminated core in which 16 types of core sheets 25 are laminated has been described as an example. This is also applied to an embedded magnet type motor having a rotor core in which plate-like resin-molded core end portions 60 and 61 are provided by similar resin molding at both axial ends of a laminated core having a configuration different from that of the second embodiment. The invention is applicable.

  -In the said 6th Embodiment, although the structure applied to the said 1st Embodiment shown in FIGS. 2-4 was demonstrated as an example, the interior magnet type motor of another structure, for example, two types of core sheets 35 and 45, was demonstrated. The present invention can also be applied to an embedded magnet type motor having a rotor core 11 </ b> C in which are stacked.

  In each of the above embodiments, an embedded magnet type motor has been described as an example of a rotating electrical machine. However, the present invention can be applied not only to an embedded magnet type motor and a reluctance motor, but also to a generator. That is, the present invention includes a stator and a rotor in which windings are wound around a plurality of teeth, and the rotor includes a plurality of magnet housing holes arranged in the circumferential direction, and a stator on both sides of each magnet housing hole. The present invention can also be applied to a generator including a magnetic path forming portion on the side closer to the air gap between the magnet housing hole and a plurality of bridge portions connecting the other magnetic path forming portions.

  In the first embodiment, as the plurality of core sheets 25 constituting the rotor core 11, the two bridge portions 21A and 21A and the two bridge cutting portions 21B and 21B formed by cutting the two bridge portions are electrically One type of core sheet provided alternately every 180 ° is used. However, the present invention can be applied to a configuration using one type of core sheet obtained by cutting a plurality of bridge portions 21 at predetermined angles other than an electrical angle of 180 °.

  In the first embodiment, the rotational direction of the rotor 3 is adjusted so that one type of core sheet 25 is equal in thickness in the axial direction of each of the 16 bridge portions 21 in the rotor core 11 and thinner than the other portions. The rotor core 11 is configured by laminating the sheets one by one by an electrical angle of 180 °. However, in the present invention, one core sheet 25 is rotated by an electrical angle of 180 ° in the rotation direction for each of the plurality of sheets so that the thicknesses of the bridge portions 21 in the axial direction are equal and thinner than the other portions. The present invention can also be applied to a configuration in which layers are stacked while being shifted.

  In the first embodiment, one type of core sheet in which the two bridge portions 21A and 21A and the two bridge cut portions 21B and 21B are alternately provided at every electrical angle of 180 ° is used. However, in the present invention, the two bridge portions 21A and 21A and the two bridge cut portions 21B and 21B are configured to use one type of core sheet provided alternately for each electrical angle other than 180 °. Is also applicable.

In the second embodiment, the rotor core 11A includes two types of core sheets 35 and 45, each having a different thickness in the axial direction of the bridge portion 21 on the outer peripheral side and a thickness in the axial direction of each reinforcing bridge portion 23. A plurality of sheets are alternately laminated so as to be thinner than the portion. However, according to the present invention, two or more types of core sheets including the core sheets 35 and 45 are arranged so that the thickness in the axial direction of each bridge portion 21 and each reinforcing bridge portion 23 is thinner than the other portions. The present invention can also be applied to a rotating electrical machine including a rotor core that is alternately stacked for every sheet or for every plurality of sheets.

  -In the said 2nd Embodiment, it may replace with the 1st core sheet 35 which cut | disconnected all the reinforcement bridge parts 23, and may use the 1st core sheet which cut | disconnected a part, and the bridge part of the outer peripheral side Instead of the second core sheet 45 obtained by cutting the entire 21A, a second core sheet obtained by cutting a part thereof may be used.

  In the seventh embodiment, both sides in the axial direction of each bridge portion 21 in the rotor core 11F are cut at the same depth, but the present invention is also applicable to a configuration in which one side in the axial direction of each bridge portion 21 is cut at the same depth. Is applicable.

In the eighth embodiment, five holes 21D are formed in the outer peripheral portion of each bridge portion 21 in the rotor core 11G, but the number of the holes 21D is not limited to “5” and can be changed as appropriate.
-In the said 8th Embodiment, although the five holes 21D are perforated by the outer peripheral part of each bridge part 21 in the rotor core 11G at equal pitch, the cross-sectional area of the axial direction of each bridge part 21 is respectively the same If it becomes, this invention is applicable also to the structure by which the several hole 21D is drilled with an unequal pitch.

1 is a longitudinal sectional view showing a schematic configuration of an embedded magnet type motor according to a first embodiment. The top view which shows the stator and rotor of the motor. The perspective view which shows the stator and rotor of the motor. The perspective view which shows the rotor of the motor. The top view which shows the core sheet which comprises the rotor core of the same rotor. (A) The perspective view which shows the one part laminated structure of the rotor core, (b) The exploded perspective view of the rotor core. The perspective view which shows the rotor of the interior magnet type motor which concerns on 2nd Embodiment. The perspective view which shows the rotor of the interior magnet type motor which concerns on 3rd Embodiment. The perspective view which shows the rotor of the interior magnet type motor which concerns on 4th Embodiment. The top view which shows the 1st core sheet | seat used with the interior magnet type motor of FIG. The top view which shows the 2nd core sheet | seat used with the motor. (A) The perspective view which shows the one part laminated structure of the rotor core of the motor, (b) The exploded perspective view of the rotor core. The top view which shows the rotor of the interior magnet type motor which concerns on 5th Embodiment. The perspective view which shows the rotor of the interior magnet type motor which concerns on 6th Embodiment. Explanatory drawing which shows the lamination | stacking method of the rotor core of the same rotor. The perspective view which shows the rotor of the interior magnet type motor which concerns on 7th Embodiment. The top view which shows the rotor. FIG. 18 is a cross-sectional view taken along line AA in FIG. 17. The perspective view which shows the rotor of the interior magnet type motor which concerns on 8th Embodiment. The graph for comparing the torque characteristics of the interior magnet type motor which concerns on 1st Embodiment, and the conventional interior magnet type motor shown in FIG. The perspective view which shows the conventional embedded magnet type | mold motor. The top view which shows another prior art example.

Explanation of symbols

  2 ... Stator, 3, 3A, 3B, 3C, 3D, 3E, 3F, 3G ... Rotor, 7 ... Teeth, 10 ... Winding, 11, 11A, 11B, 11C, 11D, 11E, 11F, 11G ... Rotor core, 13 ... Air gap, 14, 15 ... Magnetic path forming part, 16, 17, 160, 170 ... Magnet accommodation hole, 16a, 17a ... Magnet accommodation hole part, 18, 19 ... Permanent magnet, 21, 21A ... Bridge part, 21B ... Bridge cutting part, 21D ... hole, 23 ... reinforcing bridge part, 25, 35, 45 ... core sheet, 35 ... first core sheet, 45 ... second core sheet, 50, 51, 52, 70, 71, 80 , 81, 82... Resin filled portion, 60, 60 B, 61, 61 B... Resin molded core end portion, 62.

Claims (15)

In a rotating electrical machine that includes a stator wound with a plurality of teeth arranged in a circumferential direction and a rotor, and uses reluctance torque,
The rotor includes a rotor core having a plurality of magnet housing holes arranged in the circumferential direction and extending in the axial direction of the rotor, and permanent magnets embedded in the plurality of magnet housing holes, respectively.
A rotating electrical machine, wherein a resin is filled in a gap between the rotor core and the permanent magnet. In a rotating electrical machine that includes a stator wound with a plurality of teeth arranged in a circumferential direction and a rotor, and uses reluctance torque,
The rotor includes a rotor core having a plurality of magnet housing holes arranged in the circumferential direction and extending in the axial direction of the rotor, and filling the plurality of magnet housing holes with bond magnets, and magnetizing the filled bond magnets. And a bonded magnet filling part made into a magnet,
A rotating electric machine, wherein a resin is filled in a gap between the rotor core and the bonded magnet filling portion. In the rotating electrical machine according to claim 1 or 2,
The rotor core includes a plurality of bridge portions that connect a magnetic path forming portion on the side closer to the magnet accommodating hole to the air gap between the stator and the other magnetic path forming portion,
The plurality of bridge parts have a bridge cutting part or a bridge cutting part for making the thickness or cross-sectional area of each bridge part smaller than other parts,
A rotating electrical machine wherein the bridge cutting part or the bridge cutting part is filled with resin. In the rotating electrical machine according to claim 3,
The rotor core is rotatably accommodated inside the stator, and each of the plurality of magnet accommodation holes includes at least one magnet accommodation hole that is provided for each magnetic pole and is continuous in the circumferential direction,
The plurality of bridge portions include a plurality of outer peripheral bridge portions provided for the respective magnetic poles on the outer peripheral side of the rotor core, and the outer peripheral bridge portions of the magnetic poles are on both sides of the at least one magnet housing hole. The rotating electrical machine is characterized in that a magnetic path forming portion radially outside the magnet housing hole is connected to another magnetic path forming portion. In the rotating electrical machine according to claim 3,
The rotor core is rotatably accommodated inside the stator, and each of the plurality of magnet accommodation holes includes two or more magnet accommodation holes provided independently along the circumferential direction for each magnetic pole. ,
The plurality of bridge portions include a plurality of outer bridge portions provided for each of the magnetic poles on the outer peripheral side of the rotor core, and one or more reinforcing bridge portions that connect the two or more magnet housing holes of each magnetic pole. A bridge portion on the outer peripheral side of each of the magnetic poles on both sides of the two or more magnet accommodation holes, and a magnetic path formation portion and other magnetic path formation portions that are radially outward from the magnet accommodation holes; A rotating electrical machine characterized by connecting. In the rotating electrical machine according to claim 5,
The two or more magnet housing holes of each of the magnetic poles include two magnet housing holes having a V-shaped arrangement in which the air gap side is open and the anti-air gap side is connected by the reinforcing bridge portion. . In the rotating electrical machine according to any one of claims 1 to 6,
The rotor core of the rotor is a laminated core obtained by laminating a plurality of core sheets, and the plurality of core sheets includes a plurality of magnet accommodation holes that form the plurality of magnet accommodation holes, and the plurality of bridge cutting portions. A rotating electrical machine comprising a bridge portion. The rotating electrical machine according to claim 7,
The laminated core includes one or more reinforcing members that connect a plurality of bridge portions on the outer circumferential side provided for each of the magnetic poles on the outer circumferential side of the rotor core and the two or more magnet housing holes of the magnetic poles. One type of core sheet obtained by cutting at least one of the bridge portions at a predetermined angle has a thickness in the axial direction of each of the bridge portions on the outer peripheral side and a thickness in the axial direction of each of the reinforcing bridge portions, respectively. A rotating electrical machine characterized in that the rotating electric machine is laminated so as to be smaller than the other parts by shifting in the rotational direction of the rotor one by one or every plurality. The rotating electrical machine according to claim 7,
The laminated core has a first core sheet having all of the bridge portions on the outer peripheral side and a part or all of the reinforcing bridge portions, and all of the reinforcing bridge portions and having the outer peripheral side. Two or more types of core sheets including a second core sheet obtained by cutting a part or all of the bridge portion, the thickness in the axial direction of each of the bridge portions on the outer peripheral side, and the axial direction of each of the reinforcing bridge portions A rotating electrical machine characterized by being alternately stacked one by one or a plurality of sheets so that each thickness is smaller than the other portions. In the rotating electrical machine according to any one of claims 7 to 9,
The rotor core, which is the laminated core, stacks the plurality of core sheets by shifting each of the plurality of core sheets by a certain angle, and the magnet housing hole portion of each core sheet is continuously formed. A rotating electrical machine characterized in that a hole is twisted with respect to the rotation center of the rotor. In the rotating electrical machine according to any one of claims 7 to 10,
The rotor core, which is the laminated core, is provided with plate-shaped resin-molded core end portions that are resin-molded integrally with a resin-filled portion in which the gap is filled with the resin at both axial ends. Rotating electric machine. The rotating electrical machine according to claim 11,
At least one of the two resin-molded core ends provided at both ends in the axial direction of the rotor core has a large number of fins formed radially from the rotation center side to the outer diameter side of the rotor. A rotating electric machine that is characterized. In the rotating electrical machine according to any one of claims 1 to 6,
The rotor core of the rotor is a powder core obtained by sintering a predetermined material,
The powder core is formed by partially cutting each of the plurality of bridge portions so that the powder core is not completely divided and the cross-sectional areas of the plurality of bridge portions are equal to each other. A rotating electrical machine comprising a portion. The rotating electrical machine according to claim 13,
The rotating electrical machine according to claim 1, wherein the bridge cut portion of the powder core is a portion obtained by cutting both axial sides or one side of each of the plurality of bridge portions. The rotating electrical machine according to claim 13,
The rotating electrical machine according to claim 1, wherein the bridge cut portion of the powder core is a portion in which one or more holes are partially formed in an outer peripheral portion of each of the plurality of bridge portions.

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