JP2010178442A - Outer rotation type permanent magnet rotary electric machine and elevator apparatus using same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a less-torque-pulsation, low-noise, small, efficient, and inexpensive outer rotation type permanent magnet rotary electric machine, and an elevator apparatus equipped with the same. <P>SOLUTION: This machine has: a stator, which consists a ring-form yoke, a stator core having salient poles at the periphery in its radial direction and stator coils being arranged in the open slots that the stator core forms and being wound concentratedly on the salient poles; a ring-form rotor core, which is arranged around the stator; and a permanent magnet rotor, in which rectangular permanent magnets are arranged directly via proper space with the stator at the inner perimetrical face of the rotor core. In this machine, the number of poles of the permanent magnets is P, the number of salient poles of the stator is S, the greatest common divisor between P and S is M, and the least common multiple is N, the greatest common divisor N is 3 or over, and besides the ratio N/S of the least common multiple N to the greatest common divisor M is 13 or over. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an outer rotation type permanent magnet rotating electric machine and an elevator apparatus using the same.

  As a rotating electrical machine used for elevator driving, characteristics such as small and light weight and high efficiency are required, and a permanent magnet rotating electrical machine has been used. In particular, in the gearless direct drive system that does not use a transmission such as a gear that has become the mainstream recently, this tendency is strongly reflected, and a permanent magnet rotating electric machine has been used.

  The direct-drive elevator rotating electric machine is required to minimize the torque ripple that degrades the ride comfort of the elevator, and it is necessary to suppress the torque pulsation to several percent or less until the overload condition reaches approximately 200%. is there.

  As a structure of such an elevator driving rotary electric machine, a so-called internal rotation type permanent magnet rotary electric machine having a configuration in which a stator is arranged on the outer circumference and a permanent magnet rotor is arranged on the inner circumference is generally used. Contrary to this, Patent Documents 1 and 2 also disclose a configuration in which a so-called external rotation type permanent magnet rotating electrical machine in which a stator is disposed on the inner periphery and a permanent magnet rotor is disposed on the outer periphery is used as a drive motor. Is disclosed.

JP 2000-134893 A JP 2007-159394 A

  However, since the shape described in Patent Document 2 has an arc shape at the outer peripheral portion of the permanent magnet, first, it must be finished by polishing to finish this magnet shape, which is expensive in terms of production. There is a risk of becoming.

  Secondly, it is difficult to ensure the accuracy of this magnet shape, which may cause torque ripple and noise due to magnet variation.

  Furthermore, the combination of the number of poles of the permanent magnets and the stator salient poles in Patent Documents 1 and 2 has room for improvement in terms of cogging torque and vibration.

  Moreover, in patent document 2, the width | variety of the salient pole of a stator iron core is small, and there exists room for improvement at the point which obtains the maximum torque also regarding output torque.

  An object of the present invention is to provide an external rotation type permanent magnet rotating electric machine having low noise, small size, light weight, high efficiency, and low cost with less torque pulsation, and an elevator apparatus including the same.

  In one aspect, the present invention is arranged in a ring-shaped yoke portion, a stator core having a salient pole on the outer periphery in the radial direction, and an open slot portion formed by the stator core, and concentrated on the salient pole. A stator composed of a wound stator winding, a ring-shaped rotor core disposed on the outer periphery of the stator, and a rectangular parallelepiped permanent magnet on the inner peripheral surface of the rotor core; A permanent magnet rotor disposed through an appropriate air gap, the number of poles of the permanent magnet being P, the number of salient poles of the stator being S, the greatest common divisor M of P and S, and the least common multiple N The greatest common divisor M is set to 3 or more, and the ratio N / M between the least common multiple N and the greatest common divisor M is set to 13 or more.

  In a preferred embodiment of the present invention, the number of permanent magnet poles P is larger than the number of stator salient poles S.

  In a preferred embodiment of the present invention, the surface magnetic pole width of the stator salient pole is 44 to 54% of the pitch of the stator salient pole.

  Furthermore, in a preferred embodiment of the present invention, the pole arc degree of the permanent magnet is set to 0.7 or 0.87 of the permanent magnet pitch.

  Furthermore, in a preferred embodiment of the present invention, a laminated steel plate is provided between the permanent magnet and the rotor core.

  Furthermore, in a preferred embodiment of the present invention, the rotor inner peripheral surface, which is a permanent magnet mounting surface, is made flat in the circumferential direction and the axial direction for each permanent magnet mounting surface, and a plurality of permanent magnets are arranged in the axial direction. It is characterized by being shifted in the circumferential direction.

  Furthermore, in a preferred embodiment of the present invention, there is provided an elevator apparatus including a hoisting machine having a sheave around which a rope is wound, which is connected to a rotor of an outer rotation type permanent magnet rotating electric machine having the above-described characteristics. .

  According to a preferred embodiment of the present invention, it is possible to provide an external rotation type permanent magnet rotating electrical machine having a low torque pulsation, a low noise, a small size, a light weight, a high efficiency, and a low price, and an elevator apparatus using the same as a drive source.

  Other objects and features of the present invention will be clarified in the embodiments described below.

It is a radial direction cross-sectional schematic diagram of the external rotation type permanent magnet rotary electric machine by one Example of this invention. It is a principal part enlarged view of FIG. 1 is a schematic view of an abduction type permanent magnet rotating electrical machine according to an embodiment of the present invention taken along a plane parallel to an axis. It is a torque characteristic figure with respect to the surface magnetic pole width of the outer rotation type permanent magnet rotating electrical machine by one Example of this invention. It is a torque characteristic figure with respect to the pole arc degree of the permanent magnet of the outer rotation type permanent magnet rotating electric machine by one Example of this invention. It is a skew structural example figure of the outer rotation type permanent magnet rotary electric machine by one Example of this invention. 1 shows skew characteristics of an abduction type permanent magnet rotating electric machine according to an embodiment of the present invention. 6 shows a skew configuration of an outer rotation type permanent magnet rotating electric machine according to another embodiment of the present invention. It is a principal part enlarged view of the abduction type permanent magnet rotary electric machine by the other Example of this invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view of an elevator hoisting machine using an outer rotation type permanent magnet rotating electric machine according to an embodiment of the present invention, taken along a plane parallel to an axis.

  First, with reference to FIGS. 1 to 3, an abduction type permanent magnet rotating electrical machine that is most suitable for an elevator hoist according to an embodiment of the present invention will be described.

  FIG. 1 is a schematic view of an abductor-type permanent magnet rotating electric machine according to the present embodiment taken along a radial direction.

  FIG. 2 is an enlarged view of a main part (AOB part) of FIG. 1, and FIG. 3 is a schematic view of the rotating electrical machine taken along a plane parallel to the axis.

  1 to 3, the outer rotation type permanent magnet rotating electrical machine 1 includes a stator 2 and a rotor 3. The stator 2 is mainly composed of a stator core 4 and a stator winding 5. The stator core 4 is configured by laminating silicon steel plates by punching with a mold or the like. The inner periphery of the stator core 4 includes a stator core 41 that constitutes a stator magnetic path, and stator salient poles 42 that extend radially from the stator core 41 toward the outer periphery of the stator. As shown in the drawing, the space formed between the adjacent stator salient poles 42 and the stator core 41 is a slot 43, which is a space for accommodating the stator winding 5. Here, one stator winding 5 is wound around each stator salient pole 42 as shown in the figure.

  On the other hand, the rotor 3 is disposed on the outer periphery, and includes a massive rotor core 7 disposed on a ring as illustrated, and a permanent magnet 6 disposed on the inner peripheral surface of the rotor core 7. .

  The feature of the shape of the permanent magnet 6 of the present embodiment is that the six surfaces are rectangular parallelepipeds. As shown in the drawing, the inner and outer peripheral surfaces of the permanent magnet 6 are configured to be flat. Therefore, the inner peripheral surface of the rotor core 3 serving as a mounting surface for the permanent magnets faces not only in the axial direction but also in the circumferential direction. The inner peripheral surface of the rotor core 3 includes a flat permanent magnet mounting surface 71 and a portion between the rotor core poles 72 located between the poles of the permanent magnet 6. Here, the shape of the rotor core inter-pole portion 72 may be a straight line or an arc shape with respect to the circumferential direction, but from the standpoint of magnet holding and positioning, a shape that forms a protrusion from the rotor core 7 to the inner peripheral side. Is desirable. Here, the permanent magnet 6 is fixed to the magnet mounting surface 71 of the stator core with an adhesive or the like.

  1-3, the permanent magnet 6 has a pole number P of 42 and the stator core has a salient pole number S of 36. In this configuration, the greatest common divisor M of the number of poles P of the permanent magnet 6 and the number of salient poles S of the stator core 4 is 6, and the least common multiple N is 252. The ratio N / M between the least common multiple N and the greatest common divisor M is 42 at 252/6.

  The greatest common divisor M = 6 is a configuration within 60 degrees shown in FIG. 2, that is, a configuration in which the number of poles P of the permanent magnet P = 7 and the number of salient poles S = 6 of the stator core 4 is six times. In agreement, the ratio N / M = 42 exceeds 13 which indicates the scope of the present invention.

  Therefore, in the present invention, the rectangular parallelepiped permanent magnet 6 is provided on all six surfaces, and when the greatest common divisor between the number of poles P of the permanent magnet 6 and the number of salient poles S of the stator is M and the least common multiple is N, The greatest common divisor M is set to 3 or more, and the ratio N / M between the least common multiple N and the greatest common divisor M is set to 13 or more.

  In the first example described in Patent Document 2, it is disclosed that the ratio of the number of poles P of the permanent magnet and the number of salient poles S of the stator core is 3: 2 or 3: 4. Therefore, as selected in the embodiment of the present invention, when the salient pole S = 36 of the stator core is fixed, in Patent Document 2, the number of poles of the permanent magnet P = 24 or P = 48 is selected. It will be. In this case, the greatest common divisor M is 12 in both cases, but the least common multiple N is 72 and 144, respectively, and the ratio N / M between the least common multiple N and the greatest common divisor M is 6 or 12, respectively. As above, it will not be 13 or more.

  On the other hand, the relationship between the number of poles P of the permanent magnet 6 and the salient pole S of the stator core, which is another embodiment disclosed in Patent Document 2, is expressed as S = 6n, P = 6n ± 2 (n is 1 or more) Consider a combination that is an integer). In this case, if the number of salient poles S of the stator core 4 is 36 as in the present invention, the number of poles of the permanent magnet 6 is 36 ± 2, and the number of poles of the permanent magnet 6 is 34 or 38.

  Accordingly, the greatest common divisor M is 2 for both, the least common multiple N is 612,684, and the ratio of the least common multiple N to the greatest common divisor M is 306 and 342, respectively.

  In this case, the ratio of the least common multiple N and the greatest common divisor M becomes large, but the greatest common divisor M is as small as 2 and does not become 3 or more as in the present invention.

  In a permanent magnet rotating electric machine, when the number of poles of the permanent magnet is P, the number of salient poles of the stator is S, and the greatest common divisor M and the least common multiple N of P and S are the greatest common divisor M, It is a value that defines the vibration mode. In the case of the abduction-type permanent magnet rotating electrical machine 1, the number of modes (circumferential vibration cycle) when the rotor core 7 vibrates in an annular mode under electromagnetic stress is specified and increased. As a result, vibration is reduced and a low vibration motor can be obtained.

  The greatest common divisor M = 2 shown in Patent Document 2 is the second-order vibration mode, and the integral of the electromagnetic force for half a circle is applied to the rotor core located at the center, so that a large elliptical vibration is rotated. It will cause the child core 7.

  On the other hand, the ratio N / M between the least common multiple N and the greatest common divisor M is the minimum of the number of salient poles of the stator core 4 in one rotation divided by the greatest common divisor M and the number of poles of the permanent magnet 6 occupying there. It is a common multiple. This prescribes the number of cycles of cogging torque generated by the number of salient poles S of the stator core 4 and the number of poles P of the permanent magnet 6 in the above range. Since the cogging torque decreases as the number of cycles of the cogging torque increases, the cogging torque can be reduced by increasing the ratio of the least common multiple N and the greatest common divisor M.

  In one embodiment of the present invention, a ring-shaped yoke portion, a stator core having a salient pole on the outer periphery in the radial direction thereof, and an open slot portion of the stator core are concentratedly wound around the salient pole. A stator having a stator winding and a ring-shaped rotor core disposed on the outer periphery thereof are provided. On the inner peripheral surface of the rotor core, there is provided a permanent magnet rotor in which rectangular parallelepiped permanent magnets on all six sides are arranged with an appropriate gap from the stator. When the number of poles of the permanent magnet is P, the number of salient poles of the stator is S, the greatest common divisor of P and S is M, and the least common multiple is N, the greatest common divisor M is 3 or more and the smallest The ratio N / M between the common multiple N and the greatest common divisor M is 13 or more.

  As a result, it is possible to reduce the cogging torque at the time of no load, vibration and noise at the time of load, and to provide an inexpensive external rotation type permanent magnet rotating electrical machine.

  The cogging torque can be made sufficiently small without the configuration of “S = 6n, P = 6n ± 2 (n is an integer of 1 or more)” disclosed in Patent Document 2, and the number of vibration modes is thereby reduced. With the increased configuration, vibration noise can be sufficiently reduced.

  In a preferred embodiment of the present invention, the salient poles of the stator core 4 are not configured to expand in the circumferential direction at the outer peripheral end as in Patent Document 1, but are configured as open slots. An elevator hoisting machine is required to suppress torque pulsation to a small extent until a load of about 200% is reached. In addition, it is confirmed by periodic tests and the like that a torque larger than that can be generated for a holding test of the elevator apparatus. As disclosed in Patent Document 1, in a general semi-closed slot configuration having a claw portion extending in the circumferential direction on the outer peripheral side of the salient pole, the amount of magnetic flux interlinked with the stator winding 5 is set to a permanent magnet. The magnetic flux of 6 can be increased using the magnetic force of the claw. For this reason, under the overload condition, the torque can be increased by utilizing the magnetic force of the claw portion. However, on the other hand, a magnetic field caused by a large current flowing in the stator winding 5 causes partial magnetic saturation of the claw portion, resulting in a large torque fluctuation. This is a factor that impairs the ride comfort for the elevator apparatus.

  In general, the induced voltage of the stator winding 5 generated by interlinking with the magnetic flux of the permanent magnet 6 is a sine wave that does not include harmonic components, and a sine wave current is applied to the sine wave to thereby generate a three-phase. The combined torque can be a constant driving torque with little pulsation. In the semi-closed slot shape, it can be considered that the induced voltage is distorted and the harmonics of the induced voltage are increased due to the influence of the magnetic field when the current is large, thereby increasing the torque pulsation.

  On the other hand, in the open slot as in the preferred embodiment of the present invention, there is no claw that causes partial magnetic saturation even under an overload condition. Torque pulsation can be reduced even under conditions.

  In this open slot configuration, the selection of the number of poles greatly affects the torque.

  For example, when the number of salient poles S of the stator core 4 and the number of poles P of the permanent magnet 6 are selected as 36 and 42 as shown in FIGS. 1 and 2, the number of salient poles S of the stator core 4 is changed. The case where the number of poles P of the permanent magnet 6 is 30 is compared. Generally, in the semi-closed slot shape, when the number of poles P is as large as 42, the surface area of the stator core salient pole around which one stator winding 5 is wound occupies 240 degrees in electrical angle. For this reason, the negative magnetic flux density region is included, the average magnetic flux density on the surface of the stator core salient poles decreases, and the frequency increases compared to the number of poles P = 30 of the permanent magnet 6, but the generated induced voltage As a result, the torque at the same current does not change much.

  In the open slot structure according to the preferred embodiment of the present invention, the area of the surface of the stator core salient pole around which one stator winding 5 is wound can be less than 180 degrees in electrical angle, thereby reducing the negative magnetic flux density. The lower part including the part of can be removed. Therefore, the average magnetic flux density on the surface of the stator core salient pole is increased and can be increased as compared with P = 30. In the trial calculation example, the torque is improved by 10% by selecting P = 42 poles with respect to P = 30 poles.

  An increase in the number of poles results in an increase in frequency and a voltage drop due to the inductance is increased, so that the power factor is deteriorated and the inverter capacity to be driven needs to be increased, which is a drawback. However, as an elevator apparatus, it is necessary to confirm by a periodic test or the like that a larger torque can be generated for the holding test.

  In this case, the torque increase is large, and the size of the permanent magnet rotating electrical machine 1 can be reduced by increasing the number P of permanent magnets to the number S of salient poles of the stator, or the temperature of the rotating electrical machine increases. There is an advantage that the above-mentioned drawbacks can be compensated.

  Returning to FIG. 1, the salient poles of the stator core 2 of the permanent magnet rotating electrical machine 1 are marked with symbols as shown. The salient pole which wound the stator coil | winding 5 which consists of U, V, and W phase, respectively is shown. For example, U1 + indicates a first salient pole wound around + in a winding belonging to the U phase. Further, in FIG. 2, symbols as illustrated are added to the stator winding 5. For example, U1 ++ indicates that the coil is wound around the salient pole U1 + of the stator core 2, and the trailing + indicates that the coil is wound from the back surface to the front surface on the paper surface. Is shown. FIG. 1 shows a triple configuration in which the basic unit is the salient pole P of the stator core 2 and the pole number P of the permanent magnet 2 is 14 poles. FIG. / 2 minutes are shown.

  Other combinations of the number S of stator core salient poles and the number of poles P of the permanent magnet are 9 poles S of the stator core 4 and 8 poles or 10 poles of the permanent magnet 6. The basic unit can be repeated three times or more. Therefore, the salient pole S of the stator core 4 is 27, and the number P of the permanent magnet 6 is 24 or 30 as a basic unit.

  In general, when the number of poles of the permanent magnet is P, the number of salient poles of the stator is S, and the greatest common divisor M and the least common multiple N of P and S, the greatest common divisor M is 3 or more, and By setting the ratio N / M of the least common multiple N and the greatest common divisor M to 13 or more, the effect of the present invention can be exhibited.

  As described above, the three-phase configuration has been described. However, the present invention is not limited to this, and the three-phase configuration windings may be configured by shifting the electrical angle by 30 degrees, or may be a multiphase configuration. Is possible.

  The outer rotation type permanent magnet rotating electrical machine 1 of the present invention is driven by an inverter.

  In general, a three-phase inverter is provided with a current detector and a rotor magnetic pole position detector, and a sine wave current is applied according to the position of the rotor 3, and the magnitude of the current is determined by a torque command to the inverter. It is driven by an inverter with control to change the height. If necessary, it is possible to control the field weakening by advancing the phase of the current during high-speed rotation.

  In the outer rotation type permanent magnet rotating electrical machine that is the subject of the present invention, the circumferential width (surface magnetic pole width) of the permanent magnet surface of the stator salient pole of the stator core 4 has a great influence on the torque generation.

  Therefore, when the surface magnetic pole width of the stator salient pole 42 shown in FIG. 2 is θa and the pitch between the stator salient poles 42 is θs, the influence of the ratio θa / θs on the torque characteristics was calculated. The calculation conditions were based on the assumption that when the surface magnetic pole width θa of the stator salient pole 42 was changed, the magnetomotive force in the slot increased or decreased in proportion to the increase or decrease in the area of the slot 43 correspondingly. Therefore, it is assumed that the current density in the slot is constant. The calculation conditions are as follows. The number of poles P of the permanent magnet is 30, the number of salient poles S of the stator is 36, and the ratio between the pole width of the permanent magnet and the permanent magnet pitch is about 80%. It was.

  Here, torque and torque pulsation are objects of evaluation. A factor that affects this is the surface magnetic pole width θa of the stator salient poles 42. The other is to make the permanent salient pole 42 permanent by making the radius of both end faces of the permanent magnet face of the stator salient pole 42 smaller than the radius of the center face of the permanent magnet face of the stator salient pole 42 by T1. Since torque pulsation can be reduced by rounding the magnet surface, this T1 was calculated as a parameter.

  The result is shown in FIG.

  FIG. 4 shows the value of the output torque with respect to the ratio of the surface magnetic pole width θa of the stator salient pole 42 and the stator salient pole pitch θs when the pulsating torque is constant from the above calculation conditions. It has been found that the output torque can be maximized with a constant pulsation torque by setting the surface magnetic pole width θa of the stator salient poles 42 to be approximately ½ of the pitch θs between the stator salient poles 42. If the ratio of the surface magnetic pole width θa of the stator salient poles 42 to the pitch θs between the stator salient poles 42 is set in the range of 44 to 54%, the torque will be reduced within about 5% with respect to the maximum torque. I can hold it down.

  Next, FIG. 5 shows the characteristics of the permanent magnet of the abduction type permanent magnet rotating electrical machine according to the present invention with respect to the degree of polar arc. Average output torque and torque ripple are shown. In the drawing, tpp indicating the peak-peak value of the torque ripple, the sixth-order component t6 in the electrical angle of the torque ripple, and the twelfth-order component t12 are also shown. The sixth order component t6 is relatively small, and the peak-peak value of the pulsating torque is determined by the twelfth order component t12. The inventors have found that the pulsation torque can be reduced by setting the pole width (polar arc degree) in the pole pitch of the permanent magnet that can reduce the twelfth order component t12 to 0.7 or 0.87.

  By adopting this configuration, an abduction type permanent magnet rotating electrical machine 1 with a small torque ripple can be obtained. The pole width occupying the pole pitch of the permanent magnet is in the range of ± 2% with respect to 0.7 or 0.87, that is, in the range of 0.68 to 0.72 or 0.85 to 0.89. It can be said that the torque ripple is sufficiently small and within the scope of the present invention.

  Here, when the pole width occupying the pole pitch of the permanent magnet is selected to be 0.7, the ratio of the torque generation amount to the permanent magnet usage amount is large from the figure, and the pole width occupying the pole pitch of the permanent magnet is 0. .87 can be said to be a selection that can increase the absolute value of the generated torque.

  FIG. 6 is a diagram illustrating a skew configuration example of an outer rotation type permanent magnet rotating electric machine according to an embodiment of the present invention. As shown so far, skew is indispensable for achieving high torque and low torque ripple at the same time. FIG. 6A shows an example in which the permanent magnet 6 is arranged at the center of the rotor core magnet mounting surface 71. FIG. 6B shows an example in which the permanent magnet 6 is arranged on the right side of the rotor core magnet mounting surface 71. FIG. 6C shows an example in which the permanent magnet 6 is arranged on the left side of the rotor core magnet mounting surface 71.

  Here, θd is the permanent magnet shown in FIGS. 6B and 6C compared to the case where the permanent magnet 6 in FIG. 6A is arranged at the center of the rotor core magnet mounting surface 71. The movement amount of the arrangement of 6 is shown.

  Skew can be performed by changing the arrangement of FIGS. 6A, 6B, and 6C in the axial direction.

  FIG. 7 shows a skew characteristic of an outer rotation type permanent magnet rotating electric machine according to an embodiment of the present invention. Here, tpp2 indicates a torque ripple when the permanent magnet is divided into two in the axial direction and arranged as shown in FIGS. 6 (b) and 6 (c). Further, tpp3 indicates a torque ripple when the permanent magnet is divided into three in the axial direction and the respective permanent magnets are displaced as shown in FIGS. 6 (a), 6 (b), and 6 (c).

  A feature of the axial division into two is that the torque ripple can be minimized within a small range of θd. On the other hand, the division in the axial direction has a feature that the minimum value of the torque ripple can be made smaller than that in the two-division configuration. In this principle, the axial division into two becomes smaller corresponding to the electrical angle twelfth component, whereas the axial division into three works so that the electrical angle twelfth component and the sixth order component become smaller at the same time. Because it can. With the above configuration, a skew effect can be easily obtained.

  FIG. 8 shows a skew configuration of an outer rotation type permanent magnet rotating electric machine according to another embodiment of the present invention.

  The abduction type permanent magnet rotating electrical machine 1 of FIG. 8 shows a configuration in which magnet division is not performed in the axial direction. By making the circumferential width of the rotor core magnet mounting surface 71 larger than the width of the permanent magnet 6 and arranging the permanent magnet 6 obliquely as shown in the figure, it is possible to make a continuous skew. Moreover, since the permanent magnet 6 does not need to be divided in the axial direction, it can be easily manufactured, painted, and handled, and the cost can be reduced.

  In FIG. 7 described above, the calculated value of the torque ripple at the skew of the outer rotation type permanent magnet rotating electrical machine 1 shown in FIG. 8 is shown together as tcont. In addition to cost reduction, the skew effect can be reduced more than the two-part or three-part skew as described above.

  FIG. 9 is an enlarged view of a main part of an outer rotation type permanent magnet rotating electric machine according to another embodiment of the present invention.

  Here, the rotor core 7 is characterized in that it is divided into a silicon steel plate portion 74 made of a silicon steel plate and a massive iron core portion 73 made of a massive iron core. The machining of the rotor core magnet portion 71 of the rotor core 7 described above takes manufacturing time. There is a risk that it will be expensive. Further, as shown in FIG. 1, when the massive iron core 73 directly faces the stator iron core 4, an eddy current is generated in the massive iron core by the magnetic field generated by the stator winding 5, thereby improving the efficiency of the permanent magnet rotating electric machine. There is a risk of dropping.

  According to the configuration of the present embodiment, the shape of the rotor core magnet mounting surface 71 can be easily manufactured by providing the silicon steel plate portion 74 as shown. Further, the pulsating magnetic flux that may cause eddy current in the rotor core 7 passes through the laminated silicon steel sheet, and the generation of eddy current loss is minimized. The eddy current in the permanent magnet of the concentrated winding permanent magnet rotating electric machine can be suppressed to a small level by the division of the permanent magnet already performed. The silicon steel plate portion 74 of the rotor core 7 can be easily fixed to the massive core portion 73 in the axial direction or the radial direction with bolts or the like.

  Next, the structure of the elevator hoisting machine to which the permanent magnet rotating electrical machine 1 according to the embodiment of the present invention described so far is applied will be described with reference to FIG.

  FIG. 10 is a schematic view of an elevator hoisting machine using an outer rotation type permanent magnet rotating electric machine according to an embodiment of the present invention, taken along a plane parallel to the axis. The outer rotation type permanent magnet rotating electrical machine 1 and the sheave 9 are integrated. The elevator hoisting machine 11 includes an outer rotation type permanent magnet rotating electrical machine 1 that generates power, and a sheave 9 that transmits power generated by the outer rotation type permanent magnet rotating electrical machine 1 to a rope (not shown). Moreover, the brake 12 which gives braking force to the outer periphery of the rotor 3, the rotor support part 10 which supports the shaft 8 provided with the rotary body, and the stator support plate 8 which supports these are provided. Here, the brake 13 includes a brake moving part 131 that generates a braking force in contact with the outer periphery of the rotor 3 and a brake fixing part 132 that supports the brake 13 so as to be movable.

  With the above configuration, a compact and low vibration elevator hoisting machine 11 can be realized.

  By applying the permanent magnet rotating electrical machine 1 according to the embodiment of the present invention to the elevator hoisting machine 11, low torque pulsation in a wide range from the rated torque to the maximum torque is possible, and vibrations transmitted to the car and the elevator mechanism Contributes to noise reduction. Further, by skewing the rotor 3, lower torque ripple and improved torque can be realized. Further, the torque can be increased by setting the surface magnetic pole width θa of the stator salient poles to be close to 50% (44 to 54%) of the stator salient pole pitch θs. As a result, a compact elevator hoisting machine with low vibration and low price can be provided.

  In addition, although the above demonstrated about the structure at the time of applying the permanent magnet rotary electric machine of this invention to an elevator hoisting machine, this invention is not limited above. For example, the same effect can be exerted on an electric vehicle, particularly an abduction-type permanent magnet rotating electric machine mounted in a wheel like a wheel-in motor, and thereby, the ride comfort with low noise and low vibration, An electric vehicle with good fuel consumption can be supplied.

  1: external rotation type permanent magnet rotating electric machine, 2: stator, 3: rotor, 4: stator core, 41: stator core, 42: stator salient pole, 43: slot, 5: stator winding, 6: Permanent magnet, 7: Rotor core, 71: Rotor core magnet mounting surface, 72: Rotor core interpole part, 73: Lump core part of rotor core, 74: Silicon steel plate part of rotor core, 8 : Stator support plate, 9: Sheave, 10: Rotor support, 11: Elevator hoist, 12: Shaft, 13: Brake, 131: Moving part of brake, 132: Fixed part of brake

Claims (9)

  A ring-shaped yoke portion, a stator core having a salient pole on the outer periphery in the radial direction thereof, and a stator winding that is disposed in an open slot portion formed by the stator core and that is concentratedly wound around the salient pole A ring-shaped rotor core disposed on the outer periphery of the stator, and a rectangular parallelepiped permanent magnet disposed on the inner peripheral surface of the rotor core via the stator and an appropriate gap A permanent magnet rotor, the number of poles of the permanent magnet is P, the number of salient poles of the stator is S, the greatest common divisor of P and S is M, and the least common multiple is N. An external rotation type permanent magnet rotating electrical machine characterized in that M is 3 or more and the ratio N / M of least common multiple N and greatest common divisor M is 13 or more.   2. An abduction type permanent magnet rotating electric machine according to claim 1, wherein the number of poles P of the permanent magnet is larger than the number of salient poles S of the stator.   2. An abduction type permanent magnet rotating electric machine according to claim 1, wherein the surface magnetic pole width of the stator salient pole is 44 to 54% of the stator salient pole pitch.   2. An abduction type permanent magnet rotating electric machine according to claim 1, wherein the pole arc degree of the permanent magnet is set to 0.7 or 0.87 of the permanent magnet pitch.   2. An abduction type permanent magnet rotating electric machine according to claim 1, wherein a laminated steel plate is provided between the permanent magnet and the stator core.   2. The rotor inner peripheral surface which is a permanent magnet mounting surface according to claim 1, wherein each permanent magnet mounting surface is flat in the circumferential direction and the axial direction, and a plurality of permanent magnets are arranged in an axial direction and shifted in the circumferential direction. An abduction type permanent magnet rotating electrical machine characterized by the above.   7. An abduction type permanent magnet rotating electric machine according to claim 6, wherein the number of permanent magnets shifted in the circumferential direction is set to 3.   2. The rotor inner peripheral surface as a permanent magnet mounting surface according to claim 1, wherein the rotor inner peripheral surface is flat in the circumferential direction and the axial direction for each permanent magnet mounting surface, and the permanent magnet is inclined with respect to the axial direction within the flat surface. An abduction type permanent magnet rotating electrical machine characterized by   An elevator apparatus comprising the hoisting machine having the sheave around the rope using the abduction-type permanent magnet rotating electric machine according to any one of claims 1 to 8.

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