JP5682800B2 - Stator for rotating electric machine and method for manufacturing the same - Google Patents

Description

  The present invention relates to a stator of a rotating electrical machine used as an electric motor or a generator in a vehicle, for example, and a method for manufacturing the same.

  Conventionally, as a stator of a rotating electrical machine, a stator core in which a plurality of divided cores divided in the circumferential direction are assembled in an annular shape, an outer cylinder fitted and fixed to the outer periphery of the stator core, and the stator One having a stator winding wound around a core is generally known. In this stator, in particular, since the stator core is formed by assembling a plurality of split cores in an annular shape, the stator core needs to be firmly fixed to an outer cylinder fitted to the outer periphery thereof. There is.

  For example, in Patent Literature 1, as shown in FIG. 15, a fastening recess 35A is formed on the outer peripheral surface of the stator core 30A, and a fastening protrusion protruding radially inward on the inner peripheral surface side of the outer cylinder 50A. It is disclosed that 52A is formed and the fastening convex portion 52A is driven from the outer peripheral side by a jig 61A and fastened to the fastening concave portion 35A. In this case, when the fastening convex portion 52A driven by the jig 61A comes into contact with both side walls of the fastening concave portion 35A, the outer cylinder 50A and the stator core 30A are fastened. Rotation is prevented.

Japanese Patent No. 4562093

  By the way, in the case of the above-mentioned Patent Document 1, when driving the fastening convex portion 52A of the outer cylinder 50A with the jig 61A, a large processing load is required, and the fastening convex portion 52A and the fastening concave portion 35A are sufficiently brought into contact with each other. Can be difficult. As described above, when a sufficient contact area between the fastening convex portion 52A and the fastening concave portion 35A cannot be taken, local stress concentration occurs, and the fastening convex portion 52A is likely to be cracked or fatigued.

  The present invention has been made in view of the above circumstances, and provides a stator for a rotating electrical machine and a method for manufacturing the same which can realize fastening of a stator core and an outer cylinder while reducing a processing load. This is a problem to be solved.

  The invention according to claim 1, which has been made in order to solve the above problems, is a stator formed by laminating a plurality of divided cores formed by laminating a plurality of steel plates in the axial direction and divided in the circumferential direction in an annular shape. In a stator of a rotating electrical machine comprising a core, a stator winding wound around the stator core, and an outer cylinder fitted and fastened to the outer periphery of the stator core, the stator core is The outer cylinder includes a plurality of second slits extending in the circumferential direction, and a first slit extending in the axial direction between the second slits. A fastening portion formed at a portion surrounded by the first and second slits, and at least a part of the fastening portion is plastically deformed radially inward and circumferentially to engage with the recess. By joining, the outer cylinder and the plurality of steel plates of the stator core are fastened. And said that you are.

  According to the first aspect of the present invention, since the outer cylinder has the fastening portion that is at least partially plastically deformed radially inward and engages the concave portion of the stator core, the outer cylinder and the stator core And the relative rotation in the circumferential direction between the outer cylinder and the stator core can be prevented. In particular, since the fastening portion in the present invention is formed in a portion surrounded by the first and second slits that communicate the outer peripheral surface and the inner peripheral surface, the fastening portion is plastically deformed radially inward. The processing load at the time of engaging with the recess can be greatly reduced. In the case of the present invention, the processing load when the fastening portion is plastically deformed radially inward and circumferentially and engaged with the recess is reduced to about 1/3 compared with the case of Patent Document 1. It has been confirmed by the inventors of the present application that this can be done.

  In the present invention, the fastening portion provided at a predetermined portion of the outer cylinder can be easily formed by forming a U-shaped slit. In this case, the U-shaped slit is preferably formed so as to surround three directions excluding one side in the circumferential direction of the outer cylinder. In this way, when the fastening portion is plastically deformed radially inward, the plastically deformed surface of the fastening portion can be opposed in the circumferential direction, so that the fastening portion and the recess are opposed in the circumferential direction. It is possible to reliably obtain a structure that engages between the surfaces to be engaged.

  According to a second aspect of the present invention, the slit has a first slit extending in the axial direction and a second slit extending in the circumferential direction, and the first slit and the second slit intersect. It is characterized by.

  According to the second aspect of the present invention, it is possible to divide the fastening portion to form more, so that when the fastening portion is plastically deformed, the processing load applied to the fastening portion can be reduced. it can. Thereby, when plastically deforming a fastening part, damage, such as a chip | tip and a crack which generate | occur | produce in a stator core, can be reduced. Further, the equipment cost can be reduced by reducing the processing load.

  The invention according to claim 3 is characterized in that the fastening portion and the recess are joined. According to invention of Claim 3, an outer cylinder and a stator core can be fastened more firmly by joining a fastening part and a recessed part.

  The invention according to claim 4 is characterized in that surfaces of the fastening portion and the recess that are opposed to each other in the circumferential direction are engaged with each other. According to invention of Claim 4, the relative rotation to the circumferential direction of an outer cylinder and a stator core can be prevented more reliably.

  The invention described in claim 5 is characterized in that the fastening portion and the recess are provided for each of the divided cores divided in the circumferential direction. According to the fifth aspect of the present invention, since each divided core is fastened to the outer cylinder, it is possible to suppress the movement of each divided core when inputting fine vibration or the like.

  The invention described in claim 6 is characterized in that the fastening portion and the recess are fixed by welding. According to invention of Claim 6, relative rotation to the circumferential direction of an outer cylinder and a stator core can be prevented more reliably.

  The invention described in claim 7 is characterized in that the outer cylinder is fitted to the outer periphery of the stator core with a gap between the outer cylinder and the outer peripheral surface of the stator core.

  According to an eighth aspect of the present invention, there is provided a stator core formed by laminating a plurality of steel plates in the axial direction and assembling a plurality of divided cores divided in the circumferential direction in an annular shape, and an outer periphery of the stator core In a manufacturing method of a stator of a rotating electrical machine comprising an outer cylinder fitted and fastened to a stator winding wound around the stator core, a recess is formed on an outer peripheral surface of the predetermined split core The stator core, a plurality of second slits extending in the circumferential direction through the outer peripheral surface and the inner peripheral surface, and first slits extending in the axial direction between the second slits are formed in a predetermined portion to form the first A preparatory step of preparing the outer cylinder having a fastening portion formed at a portion surrounded by the first and second slits, an assembling step of assembling the stator winding and the stator core, and the stator core The outer cylinder is fitted to the outer periphery of the fastening part, and at least a part of the fastening part is A fastening step of fastening the outer tube and the plurality of steel plates of the stator core by plastically deforming in the direction inward and in the circumferential direction and engaging with the recesses of the stator core. It is characterized by that.

  According to the invention described in claim 8, since the above preparation process, assembly process, and fastening process are performed, the fastening between the stator core and the outer cylinder is realized while reducing the processing load. Thus, the stator of the rotating electrical machine that can be made can be easily manufactured.

  The invention described in claim 9 is characterized in that, prior to the fastening step, a preliminary bending step of plastically deforming at least a part of the fastening portion inward in the radial direction is performed.

  According to the ninth aspect of the present invention, the radial gap formed between the fastening portion and the stator core when the fastening portion is subjected to the spring back by performing the preliminary bending step. Can be suppressed small. Therefore, since the radial engagement between the fastening portion of the outer cylinder and the concave portion of the stator core can be ensured, the fastening between the outer cylinder and the stator core can be ensured.

  The pre-bending amount of the fastening portion in the pre-bending step is set so that the fastening portion comes into contact with the opening edge portion of the recess when the outer cylinder is fitted to the outer periphery of the stator core. This is preferable for obtaining a more reliable engagement between the fastening portion and the recessed portion. However, pre-bending the fastening part in this state may interfere with the fitting work when fitting the outer cylinder to the outer periphery of the stator core. What is necessary is just to set the amount of preliminary bending of a part. In addition, the preliminary bending process is performed after the slit is formed in a predetermined part of the outer cylinder in the preparation process and before the main bending process in which at least a part of the fastening portion is plastically deformed radially inward in the fastening process. However, if it is performed before the outer cylinder is fitted to the outer periphery of the stator core in the fastening process, the preliminary bending process can be easily performed.

  According to a tenth aspect of the present invention, in the fastening step, after the outer cylinder is fitted to the outer periphery of the stator core, the outer cylinder is compressed from the outer peripheral side and elastically deformed. It is characterized in that at least a part of is plastically deformed radially inward.

  According to the tenth aspect of the present invention, when the pressurization to the outer cylinder is released after the fastening part is plastically deformed, the fastening part is rotated as the outer cylinder elastically returns in the diameter increasing direction. Therefore, the circumferential gap formed between the fastening portion and the opening edge portion of the concave portion of the stator core can be reduced. Therefore, since the circumferential engagement between the fastening portion of the outer cylinder and the concave portion of the stator core can be ensured, the fastening between the outer cylinder and the stator core can be ensured.

  According to an eleventh aspect of the present invention, in the fastening step, when at least a part of the fastening portion is plastically deformed radially inward, the inner peripheral surface of the fastening portion is associated with the opening edge portion of the recess. A mating engagement step is formed.

  According to the eleventh aspect of the present invention, when the pressurization to the outer cylinder is released after the fastening part is plastically deformed, the fastening part is elastically restored in the direction in which the outer cylinder expands in diameter. The engaging step portion formed on the inner peripheral surface of the stator engages with the opening edge portion of the concave portion of the stator core. Thereby, the circumferential gap formed between the engaging step portion and the opening edge portion can be reliably suppressed to be small. Therefore, since the circumferential engagement between the fastening portion of the outer cylinder and the concave portion of the stator core can be further ensured, the fastening between the outer cylinder and the stator core can be further ensured. Become.

  The invention according to claim 12 is characterized in that, in the fastening step, the outer cylinder is fitted to the outer periphery of the stator core with a gap between the outer cylinder and the outer peripheral surface of the stator core. .

FIG. 3 is an axial cross-sectional view schematically showing the configuration of the rotating electrical machine according to the first embodiment. 1 is an overall perspective view of a stator according to Embodiment 1. FIG. It is a perspective view which shows the state which fitted the outer cylinder to the outer periphery of the stator core in Embodiment 1. FIG. FIG. 3 is a main part cross-sectional view showing a fastening state between the stator core and the outer cylinder in the first embodiment. FIG. 3 is a block diagram illustrating steps of a method for manufacturing a stator according to Embodiment 1. It is explanatory drawing which shows the fastening process of the manufacturing method of the stator which concerns on Embodiment 1, Comprising: (a) shows the state before the process by a punch, (b) shows the state after the process by a punch. In Embodiment 2, it is a perspective view which shows the state which fitted the outer cylinder to the outer periphery of the stator core. FIG. 10 is a cross-sectional view of a main part illustrating a fastening state of a stator core and an outer cylinder in the second embodiment. In Embodiment 3, it is a perspective view which shows the state which fitted the outer cylinder to the outer periphery of the stator core. FIG. 10 is a cross-sectional view of a main part showing a fastening state of a stator core and an outer cylinder in a third embodiment. In Embodiment 4, it is a perspective view which shows the state which fitted the outer cylinder to the outer periphery of the stator core. FIG. 12 is a main part sectional view showing a fastening state of a stator core and an outer cylinder in a fourth embodiment, and is a sectional view taken along line AA in FIG. 11. FIG. 10 is a block diagram showing steps of a method for manufacturing a stator according to Embodiment 5. It is explanatory drawing which shows each process of the manufacturing method of the stator which concerns on Embodiment 5 typically, Comprising: (a) shows a preliminary | backup bending process, (b) is an outer cylinder on the outer periphery of a stator core in a fastening process. (C) shows a state in which the diameter of the outer cylinder is reduced in the fastening process, (d) shows a state in which the fastening portion has been crimped in the fastening process, and (e) shows a fastening process. The state which open | released the diameter reduction of an outer cylinder is shown. It is explanatory drawing which shows the state which fastens a stator core and an outer cylinder in the conventional stator.

  Hereinafter, an embodiment in which a stator of a rotating electrical machine according to the present invention is embodied will be specifically described with reference to the drawings.

Embodiment 1
FIG. 1 is an axial cross-sectional view schematically showing the configuration of the rotating electrical machine according to the first embodiment. The rotating electrical machine according to the present embodiment is used as an electric motor for a vehicle. As shown in FIG. 1, a pair of substantially bottomed cylindrical housing members 10a and 10b are joined at openings. The housing 10, the rotor 14 fixed to the rotary shaft 13 rotatably supported by the housing 10 via bearings 11 and 12, and the housing 10 fixed to the housing 10 at a position surrounding the rotor 14. And a fixed stator 20.

  In the rotor 14, a plurality of magnetic poles having different magnetism alternately in the circumferential direction are formed by a permanent magnet on the outer circumferential side facing the inner circumferential side of the stator 20. The number of magnetic poles of the rotor 14 is not limited because it varies depending on the rotating electrical machine. In this embodiment, an 8-pole rotor (N pole: 4, S pole: 4) is used.

  Next, the stator 20 will be described with reference to FIGS. FIG. 2 is a perspective view of the stator according to the first embodiment. FIG. 3 is a perspective view showing a state in which an outer cylinder is fitted to the outer periphery of the stator core in the first embodiment. FIG. 4 is a cross-sectional view of a main part showing a fastening state between the stator core and the outer cylinder in the first embodiment.

  As shown in FIG. 2, the stator 20 includes a stator core 30 in which a plurality of divided cores 32 divided in the circumferential direction are assembled in an annular shape, and a three-phase stator wound around the stator core 30. A winding 40 and a cylindrical outer cylinder 50 fitted and fixed to the outer periphery of the stator core 30 are provided.

  The stator core 30 is formed in an annular shape by connecting a predetermined number (24 in this embodiment) of divided cores 32 in the circumferential direction, and has a plurality of slots 31 arranged in the circumferential direction on the inner circumferential side thereof. . The slot 31 is formed so that the depth direction thereof coincides with the radial direction. The number of slots 31 formed in the stator core 30 is two per one phase of the stator winding 40 with respect to the number of magnetic poles (eight magnetic poles) of the rotor 14. In this embodiment, since 8 × 3 × 2 = 48, the number of slots is 48.

  The slot 31 is provided with a slot accommodating portion for a conducting wire 45 constituting a stator winding 40 wound around the stator core 30. In the present embodiment, as shown in FIG. 4, the slot accommodating portions of the twelve conductors 45 are installed in each slot 31 in a state of being aligned in a row in the radial direction.

  The split core 32 has a shape in which one slot 31 is defined and one slot 31 is defined between the adjacent split cores 32 in the circumferential direction. Specifically, as shown in FIG. 4, the split core 32 has a pair of teeth portions 33 that protrude radially inward, and a back core portion 34 that connects the teeth portions 33 radially outward. ing. The split core 32 is formed by laminating a plurality of electromagnetic steel plates formed in a predetermined shape by press punching in the axial direction of the stator core 30 and fixing them by caulking.

  In addition, the recessed part engaged in the state which the below-mentioned 1st and 2nd fastening part 52a, 52b provided in the outer cylinder 50 contact | abutted to the outer peripheral surface of one division | segmentation core 32 of 24 pieces. 35 (see FIG. 4) is provided. The recess 35 is formed in a groove shape having a predetermined width and extending in the axial direction up to the vicinity of both axial ends of the split core 32. The side walls on both sides in the circumferential direction of the concave portion 35 are inclined surfaces that are inclined so as to approach each other toward the bottom portion on the radially inner side. The recess 35 is provided at a position corresponding to one of the teeth 33 of the pair of teeth 33 protruding inward in the radial direction.

  In the stator winding 40, a predetermined number (12 in this embodiment) of conductive wires 45 formed in a predetermined waveform shape are stacked in a predetermined state to form a strip-shaped conductor integrated body, and the conductor integrated body is spirally formed. It is formed into a cylindrical shape by being wound around (six rounds in this embodiment). The conducting wire 45 constituting the stator winding 40 connects the slot accommodating portion installed in the slot 31 of the stator core 30 and the slot accommodating portions accommodated in the slots 31 in the circumferential direction outside the slot 31. It is formed in the waveform shape which has the turn part currently made. As the conducting wire 45, an insulating coated rectangular wire composed of a conductor having a rectangular cross section and an insulating film covering the outer periphery of the conductor is employed.

  The stator core 30 is assembled in an annular shape by a predetermined number of divided cores 32 into which teeth portions 33 are inserted from the outer peripheral side with respect to a stator winding 40 formed in a cylindrical shape. As a result, the stator winding 40 is assembled in a state in which the predetermined slot accommodating portion of each conductor 45 is accommodated in the predetermined slot 31 of the stator core 30, as shown in FIG. In this case, the slot accommodating portion of each conducting wire 45 is accommodated in a slot 31 for each predetermined number of slots (in this embodiment, three phases × 2 (double slots) = 6). Further, the turn portions connecting the adjacent slot accommodating portions of the conductive wire 45 protrude from both end surfaces 30a of the stator core 30 in the axial direction, and the stator winding 40 is formed by the multiple turn portions protruding. Coil end portions 42 are formed at both ends in the axial direction.

  The stator core 30 formed by assembling a predetermined number of split cores 32 in an annular shape with respect to the stator winding 40 is fixed (maintained) in an annular shape by a cylindrical outer cylinder 50 fitted to the outer periphery of the split core 32. Shape). As shown in FIGS. 2 and 3, at a predetermined position of the outer cylinder 50, there are one first slit 51 a extending in the axial direction and two second slits 51 b extending in the circumferential direction. An E-shaped slit 51 is provided. Thereby, it formed in the circumferential direction both sides of the 1st slit 51a so that three directions except the circumferential direction one side of the outer cylinder 50 may be enclosed by the 1st 1st slit 51a and the 2nd 2nd slit 51b. A U-shaped slit 51 is formed, and first and second fastening portions 52 a and 52 b are formed in respective portions surrounded by the U-shaped slit 51.

  The first and second fastening portions 52a and 52b are pressed against the recesses 35 provided on the outer peripheral surface of the stator core 30 by plastically deforming the distal end portion on the first slit 51a side toward the radially inner side. The outer cylinder 50 and the stator core 30 are fastened with each other while being in contact with each other. In this case, the front end portion of the first fastening portion 52a is in contact with the inclined surface of the side wall whose inner surface is on one side in the circumferential direction of the concave portion 35 (left side in FIG. 4). Further, the front end portion of the second fastening portion 52b is in contact with the inclined surface of the side wall whose inner surface is on the other circumferential side of the concave portion 35 (the right side in FIG. 4). That is, the first and second fastening portions 52a and 52b and the concave portion 35 are opposed to each other in the circumferential direction, so that the relative rotation of the outer cylinder 50 and the stator core 30 to both sides in the circumferential direction is prevented. It is more reliably prevented.

  Further, the distal end portions of the first and second fastening portions 52a and 52b that have plastically entered into the recess 35 are fixed to the outer cylinder 50 by having both axial ends abut against the side walls on both axial sides of the recess 35. The relative movement of the child core 30 in the axial direction is restricted. Furthermore, in this embodiment, the front-end | tip part of the 1st and 2nd fastening parts 52a and 52b and the bottom face of the recessed part 35 are fixed by welding. As a result, the relative rotation of the outer cylinder 50 and the stator core 30 to both sides in the circumferential direction and the relative movement in the axial direction are prevented more reliably.

  Next, the manufacturing method of the stator 20 of this embodiment is demonstrated. As shown in FIG. 5, the method for manufacturing the stator 20 according to the present embodiment assembles the preparation step 101 for preparing the predetermined stator core 30 and the outer cylinder 50, and the stator winding 40 and the stator core 30. The assembly process 102 and the fastening process 103 for fastening the outer cylinder 50 and the stator core 30 are sequentially performed.

  First, in the preparation step 101, a stator core 30 in which a recess 35 is formed on the outer peripheral surface of a predetermined split core 32 and an E-shaped slit 51 including a first slit 51a and a second slit 51b are formed in a predetermined portion. And the outer cylinder 50 in which the 1st and 2nd fastening part 52a, 52b was formed in each site | part enclosed by the slit 51 is prepared.

  In the next assembling step 102, the teeth 33 of each split core 32 are inserted from the outer peripheral side into the stator winding 40 formed into a cylindrical shape, and a predetermined number of split cores 32 are fixed to the stator winding 40. Assemble in an annular shape along the circumferential direction. As a result, the stator winding 40 is assembled in a state of being wound around the stator core 30.

  In the next fastening step 103, the outer cylinder 50 is placed on the outer periphery of the stator core 30 around which the stator winding 40 is wound, and the concave portion 35 of the stator core 30 and the first and second fastening portions 52a of the outer cylinder 50, 52b is aligned and fitted in the axial direction. In this case, the outer cylinder 50 is fitted so that the first slit 51 a of the outer cylinder 50 is positioned at the center in the circumferential direction of the concave portion 35 of the stator core 30.

  Subsequently, as shown in FIG. 6A, the punch (pressing member) 61 is connected to the distal ends of the first and second fastening portions 52 a and 52 b on the both sides in the circumferential direction of the first slit 51 a formed in the outer cylinder 50. The tip portions of the first and second fastening portions 52a and 52b are plastically deformed radially inward by being brought into contact with each of the portions from the outer peripheral side. As a result, as shown in FIG. 6B, the inner surfaces of the distal end portions of the first and second fastening portions 52 a and 52 b are brought into contact with the inclined surfaces of the side walls on both sides in the circumferential direction of the recess 35. Then, the front-end | tip part of the 1st and 2nd fastening parts 52a and 52b and the bottom face of the recessed part 35 are weld-fixed, and the fastening process 103 is complete | finished. Thereby, the outer cylinder 50 and the stator core 30 are firmly fastened.

  Thereafter, finishing treatment or the like is performed as necessary to complete the stator 20 shown in FIG.

  As described above, according to the stator 20 of the present embodiment, the outer cylinder 50 is engaged in a state in which at least a part is plastically deformed radially inward and is in contact with the recess 35 of the stator core 30. Since the first and second fastening portions 52a and 52b are provided, the outer cylinder 50 and the stator core 30 are fastened and the relative rotation of the outer cylinder 50 and the stator core 30 in the circumferential direction is prevented. Can do. In particular, since the first and second fastening portions 52a and 52b are formed in a portion surrounded by the slit 51 that communicates the outer peripheral surface and the inner peripheral surface, the first and second fastening portions 52a and 52b have a diameter. The processing load when plastically deforming inward in the direction and contacting the recess 35 can be greatly reduced.

  In the present embodiment, since the first and second fastening portions 52a, 52b and the recess 35 are in contact with each other in the circumferential direction, the circumferential surfaces of the outer cylinder 50 and the stator core 30 are in contact with each other. Relative rotation can be prevented more reliably. Further, since the first and second fastening portions 52a and 52b and the recess 35 are fixed by welding, the relative rotation in the circumferential direction and the relative movement in the axial direction between the outer cylinder 50 and the stator core 30 are further increased. It can be surely prevented.

  In particular, in the present embodiment, two first and second fastening portions 52a and 52b are formed by forming a U-shaped slit 51, and both circumferential sides of the outer cylinder 50 and the stator core 30 are formed. The relative rotation is prevented. Therefore, the stator core 30 of the present embodiment is also applied to a rotating electrical machine in which the torque transmission direction changes in the reverse direction, such as a rotating electrical machine configured to be able to selectively use the functions of the motor and the generator. Can do.

  And according to the manufacturing method of the stator 20 of this embodiment, since the preparatory process 101, the assembly | attachment process 102, and the fastening process 103 are performed, while reducing the processing load, the stator core 30 and A stator of a rotating electrical machine that can achieve fastening of the outer cylinder 50 can be easily manufactured.

[Embodiment 2]
FIG. 7 is a perspective view showing a state in which an outer cylinder is fitted to the outer periphery of the stator core in the second embodiment. FIG. 8 is a cross-sectional view of a main part showing a fastening state of the stator core and the outer cylinder in the second embodiment.

  The stator 20 of the second embodiment has the same basic configuration as the stator 20 of the first embodiment. However, as shown in FIGS. 7 and 8, the shape of the slit 51 provided in the outer cylinder 50 is the first embodiment. And different. Hereinafter, different points will be described.

  In the second embodiment, a U-shape including one first slit 53a extending in the axial direction and two second slits 53b extending in the circumferential direction is provided at a predetermined position of the outer cylinder 50. A slit 53 having a shape is provided. The slit 53 is formed in a U shape so as to surround three directions except for one side in the circumferential direction of the outer cylinder 50 (left side in FIG. 7) by one first slit 53a and two second slits 53b. Fastening portions 54 are respectively formed at portions surrounded by the U-shaped slit 53.

  The fastening portion 54 is engaged in a state in which the distal end portion on the first slit 53a side is plastically deformed radially inward and is in contact with the concave portion 35 provided on the outer peripheral surface of the stator core 30. Thus, the outer cylinder 50 and the stator core 30 are fastened. In this case, the inner surface of the distal end portion of the fastening portion 54 is in contact with the inclined surface of the side wall on one side in the circumferential direction of the concave portion 35 (left side in FIG. 8). In other words, the fastening portion 54 and the recess 35 are more reliably prevented from rotating relative to each other in the circumferential direction between the outer cylinder 50 and the stator core 30 because the surfaces facing each other in the circumferential direction are in contact with each other. It is like that.

  According to the stator 20 of the second embodiment configured as described above, at least a part of the outer cylinder 50 is plastically deformed radially inward and is in contact with the recess 35 of the stator core 30. Since the engaging portion 54 to be engaged is provided, the stator core 30 and the outer cylinder 50 can be reduced while greatly reducing the processing load when the fastening portion 54 is plastically deformed radially inward and brought into contact with the recess 35. The same operations and effects as in the first embodiment can be achieved.

[Embodiment 3]
FIG. 9 is a perspective view showing a state in which an outer cylinder is fitted to the outer periphery of the stator core in the third embodiment. FIG. 10 is a cross-sectional view of a main part showing a fastening state of the stator core and the outer cylinder in the third embodiment.

  The stator 20 of the third embodiment has the same basic configuration as the stator 20 of the first embodiment. However, as shown in FIGS. 9 and 10, the shape of the slit 55 provided in the outer cylinder 50 is the first embodiment. And different. Hereinafter, different points will be described.

  In the third embodiment, the predetermined shape of the outer cylinder 50 has a king character formed by one first slit 55a extending in the axial direction and three second slits 55b extending in the circumferential direction. A slit 55 having a shape is provided. Thereby, it formed in the circumferential direction both sides of the 1st slit 55a so that three directions except the circumferential direction one side of the outer cylinder 50 might be enclosed by the 1st 1st slit 55a and the 2nd 2nd slit 55b. A total of four U-shaped slits 55 are formed, and two first to fourth fastening portions 56 a to 56 d are formed at four locations surrounded by the U-shaped slits 55. Has been.

  That is, in the case of the third embodiment, a single second slit 55b that intersects the first slit 55a at a right angle is formed between the two second slits 55b on both sides in the axial direction. Between the two second slits 55b on both sides in the axial direction, the first and second fastening portions 56a and 56b and the third and fourth fastening portions 56c and 56d divided into two are formed. As a result, the first to fourth fastening portions 56a to 56d formed at the four locations have a width in the axial direction of about ½ compared to the first and second fastening portions 52a and 52b of the first embodiment. It has become. Therefore, as shown in FIG. 10, the first slits 55a side tips of the first to fourth fastening portions 56a to 56d are plastically deformed radially inward, and the outer periphery of the stator core 30 When contacting the concave portion 35 provided on the surface, the processing load applied to the first to fourth fastening portions 56a to 56d can be reduced.

  In addition, the front-end | tip part of 1st-4th fastening part 56a-56d is engaged in the state which the inner surface contact | abutted to the inclined surface of the side wall in the circumferential direction both sides of the recessed part 35, respectively. Therefore, also in the case of Embodiment 3, the 1st-4th fastening part 56a-56d and the recessed part 35 are engaged with the outer cylinder 50 by the state where the surfaces which oppose in the circumferential direction contact | abutted. Relative rotation to both sides in the circumferential direction with the stator core 30 is more reliably prevented.

  According to the stator 20 of the third embodiment configured as described above, at least a part of the outer cylinder 50 is plastically deformed radially inward and is in contact with the recess 35 of the stator core 30. Since the first to fourth fastening portions 56a to 56d are engaged, the processing load when the first to fourth fastening portions 56a to 56d are plastically deformed radially inward and brought into contact with the recess 35 is greatly increased. Thus, the same operation and effect as in the first embodiment can be achieved, for example, the fastening between the stator core 30 and the outer cylinder 50 can be realized.

  In particular, in the case of the third embodiment, the slit 55 is shaped like a king consisting of one first slit 55a extending in the axial direction and three second slits 55b extending in the circumferential direction. The two second slits 55b that are formed and are perpendicular to the first slit 55a are formed between the two second slits 55b on both sides in the axial direction. The first and second fastening portions 56a and 56b and the third and fourth fastening portions 56c and 56d formed between the two second slits 55b are divided into two. Therefore, when plastically deforming the first to fourth fastening portions 56a to 56d, the processing load applied to the first to fourth fastening portions 56a to 56d can be made smaller than that of the first embodiment. Damage such as chipping or cracking generated in the stator core 30 can be reduced. In addition, since the processing load is significantly reduced, the equipment cost can be reduced.

[Embodiment 4]
FIG. 11 is a perspective view illustrating a state in which an outer cylinder is fitted to the outer periphery of the stator core in the fourth embodiment. FIG. 12 is a cross-sectional view of a main part showing a fastening state of the stator core and the outer cylinder in the fourth embodiment, and is a cross-sectional view taken along the line AA in FIG. 11.

  The stator 20 of the fourth embodiment has the same basic configuration as the stator 20 of the first embodiment. However, as shown in FIGS. 11 and 12, the shape of the slit 57 provided in the outer cylinder 50 is the first embodiment. And different. Hereinafter, different points will be described.

  In the fourth embodiment, at one predetermined position of the outer cylinder 50, the reverse S composed of two first slits 57a extending in the axial direction and three second slits 57b extending in the circumferential direction is provided. A letter-shaped slit 57 is provided. Thus, the first second slit 57a and the two second slits 57b are formed on both sides in the axial direction of the central second slit 57b so as to surround the three directions excluding one circumferential side of the outer cylinder 50. The U-shaped slits 57 are formed, and first and second fastening portions 58 a and 58 b are formed at respective portions surrounded by the U-shaped slits 57.

  In addition, the first and second fastening portions 58a and 58b provided on the outer cylinder 50 are in contact (engaged) with the outer peripheral surface of one of the 24 divided cores 32 constituting the stator core 30. ) Two recesses 35a and 35b are provided. The first and second recesses 35a and 35b are provided at positions corresponding to the pair of teeth portions 33 protruding inward in the radial direction. In this case, the tip end portion of the first fastening portion 58a is in contact with a side wall made of an inclined surface on one side in the circumferential direction of the first recess portion 35a (left side in FIG. 12). Further, the tip of the second fastening portion 58b is in contact with a side wall formed of an inclined surface on the other circumferential side of the second recess 35b (the right side in FIG. 12). Thereby, also in the case of Embodiment 4, when the 1st and 2nd fastening parts 58a and 58b and the recessed part 35 contact | abut in the circumferential direction, the outer cylinder 50, the stator core 30, and The relative rotation to both sides in the circumferential direction is more reliably prevented.

  Note that the first and second fastening portions 58a and 58b have an axial width of about ½ that of the first and second fastening portions 52a and 52b of the first embodiment. Therefore, also in the case of Embodiment 4, as shown in FIG. 12, the front-end | tip part of 1st and 2nd fastening part 58a, 58b is plastically deformed toward the radial direction inner side, and the stator core 30 is shown. When abutting against the recess 35 provided on the outer peripheral surface, the processing load applied to the first and second fastening portions 58a, 58b can be reduced.

  According to the stator 20 of the fourth embodiment configured as described above, at least a part of the outer cylinder 50 is plastically deformed radially inward, so that the first and second recesses 35a of the stator core 30 are formed. Since the first and second fastening portions 58a and 58b are engaged with each other while being in contact with 35b, the first and second fastening portions 58a and 58b are plastically deformed radially inward to form the first and second portions. The same operations and effects as those of the first embodiment can be achieved, for example, the fastening of the stator core 30 and the outer cylinder 50 can be realized while greatly reducing the processing load when contacting the recesses 35a and 35b.

[Embodiment 5]
FIG. 13 is a block diagram illustrating each step of the stator manufacturing method according to the fifth embodiment. FIG. 14 is an explanatory view schematically showing each step of the stator manufacturing method according to Embodiment 5, wherein (a) shows a preliminary bending step, and (b) shows the outer periphery of the stator core in the fastening step. (C) shows a state where the diameter of the outer cylinder is reduced in the fastening process, (d) shows a state where the fastening portion is caulked in the fastening process, and (e) ) Shows a state in which the diameter of the outer cylinder is released in the fastening process. 14B, 14C, 14D, and 14E, the stator winding assembled to the stator core is omitted.

  The stator 20 of the fifth embodiment has the same basic configuration as the stator 20 of the first embodiment (see FIG. 2), but the manufacturing method is different from that of the first embodiment as shown in FIGS. . Hereinafter, different points of the manufacturing method of the stator 20 of the fifth embodiment will be mainly described, and different points of the stator 20 will be described. In addition, in this embodiment, the same code | symbol is attached | subjected to the member which is common in Embodiment 1 of the stator 20, and detailed description is abbreviate | omitted.

  The manufacturing method of the stator 20 according to the fifth embodiment includes a preparation step 201 for preparing a predetermined stator core 30 and an outer cylinder 50, and at least a part of the first and second fastening portions 52a and 52b in advance in the radial direction. A pre-bending step 202 for plastic deformation to the side, an assembly step 203 for assembling the stator winding 40 and the stator core 30, and a fastening step 204 for fastening the outer tube 50 and the stator core 30 in order. is there.

  In the preparation step 201, a stator core 30 having a concave portion 35 formed on the outer peripheral surface of a predetermined split core 32, and an E-shaped slit 51 composed of a first slit 51a and a second slit 51b are formed in a predetermined portion. The outer cylinder 50 in which the first and second fastening portions 52a and 52b are formed at the respective parts surrounded by the slit 51 is prepared. In the first embodiment, the concave portion 35 formed in the stator core 30 is an inclined surface that is inclined so that the side walls on both sides in the circumferential direction of the concave portion 35 approach each other toward the bottom portion on the radially inward side. On the other hand, the fifth embodiment differs in that the side walls on both sides in the circumferential direction of the recess 35 are flat surfaces that intersect the bottom surface and the outer peripheral surface of the split core 32 at substantially right angles.

  In the next preliminary bending step 202, as shown in FIG. 14A, the first and second fastening portions 52a and 52b of the outer cylinder 50 are bent using a punch (pressing member) (not shown), The entire first and second fastening portions 52a and 52b are plastically deformed radially inward. In this case, the amount of preliminary bending of the first and second fastening portions 52a and 52b is such that the first and second fastening portions 52a and 52b and the recess 35 are more securely engaged with each other and the stator core 30 that is performed in the fastening step 204. It is set appropriately in consideration of the balance with the ease of fitting work for fitting the outer cylinder 50 to the outer periphery of the outer sleeve 50. In the present embodiment, when the outer cylinder 50 is fitted to the outer periphery of the stator core 30 in the fastening step 204, the first and second fastening portions 52a and 52b and the opening edge portions on both sides in the circumferential direction of the concave portion 35 come into contact with each other. It is set to be in a state of being separated or separated by a predetermined distance. If the preliminary bending step 202 is continuously performed immediately after the slit 51 is formed in the outer cylinder 50 in the preparation step 201, the working efficiency can be improved.

  In the next assembling step 203, similarly to the first embodiment, the teeth 33 of each divided core 32 are inserted from the outer peripheral side into the cylindrical stator winding 40, and a predetermined number of divided cores are inserted. 32 is assembled in an annular shape along the circumferential direction of the stator winding 40. As a result, the stator winding 40 is assembled in a state of being wound around the stator core 30.

  In the next fastening step 204, as shown in FIG. 14B, the outer cylinder 50 is placed on the outer periphery of the stator core 30 around which the stator winding 40 is wound, and the recess 35 and the outer cylinder 50 of the stator core 30 are placed. The first and second fastening portions 52a and 52b are aligned and fitted in the axial direction. In this case, the outer cylinder 50 is fitted so that the first slit 51 a of the outer cylinder 50 is positioned at the center in the circumferential direction of the concave portion 35 of the stator core 30.

  Subsequently, as shown in FIG. 14C, a plurality of dies 63 arranged on the outer peripheral side of the outer cylinder 50 fitted to the outer periphery of the stator core 30 are advanced in the centripetal direction of the outer cylinder 50, The outer cylinder 50 is compressed and elastically deformed from the outer peripheral side. Thereby, the front-end | tip of 1st and 2nd fastening part 52a, 52b is displaced so that it may mutually approach toward the circumferential direction center of the recessed part 35. FIG. Then, with the outer cylinder 50 compressed in this way, as shown in FIG. 14 (d), punches (pressing members) 62 are arranged on both sides in the circumferential direction of the first slit 51 a formed in the outer cylinder 50. By plastically deforming the distal ends of the first and second fastening portions 52a and 52b toward the radially inward side by driving them into contact with the respective distal ends of the first and second fastening portions 52a and 52b from the outer peripheral side. Let At this time, when the first and second fastening portions 52a and 52b are plastically deformed by the punch 62, the engagement of the inner peripheral surfaces of the first and second fastening portions 52a and 52b with the opening edge portion of the recess 35 is performed. A stepped portion 59 is formed.

  Subsequently, as shown in FIG. 14 (e), the plurality of dies 63 arranged on the outer peripheral side of the outer cylinder 50 are retracted in the centrifugal direction of the outer cylinder 50 to release the pressurization to the outer cylinder 50. As a result, the engagement step portion 59 formed on the inner peripheral surface of each of the first and second fastening portions 52a and 52b is moved in the circumferential direction of the concave portion 35 as the outer cylinder 50 is elastically restored in the direction of expanding the diameter. Engage with the open edge portions on both sides. Thereby, the outer cylinder 50 and the stator core 30 are firmly fastened, and the fastening process 204 is completed.

  Thereafter, finishing treatment or the like is performed as necessary to complete the stator 20 shown in FIG.

  As described above, according to the method for manufacturing the stator 20 of the present embodiment, the preliminary bending step in which the first and second fastening portions 52a and 52b are plastically deformed radially inward in advance before the fastening step 204. 202 is performed. Therefore, when the fastening process 204 is performed, the radial direction formed between the first and second fastening parts 52a, 52b and the stator core 30 with the occurrence of springback of the first and second fastening parts 52a, 52b. The gap can be reduced. Therefore, since the radial engagement between the first and second fastening portions 52a and 52b of the outer cylinder 50 and the recess 35 of the stator core 30 can be ensured, the outer cylinder 50 and the stator core 30 can be engaged with each other. It is possible to ensure the fastening.

  In the fastening process 204 of the present embodiment, after the outer cylinder 50 is fitted to the outer periphery of the stator core 30, the outer cylinder 50 is compressed from the outer peripheral side and elastically deformed in the first and second fastening states. The parts 52a and 52b are plastically deformed radially inward. Therefore, after the first and second fastening portions 52a and 52b are plastically deformed, when the pressure on the outer cylinder 50 is released, the first and second fastening parts 52a and 52b are elastically restored in the diameter increasing direction. Since the second fastening portions 52a and 52b are displaced in the circumferential direction, the circumferential gap formed between the first and second fastening portions 52a and 52b and the opening edge portion of the recess 35 can be suppressed small. . Therefore, since the circumferential engagement between the first and second fastening portions 52a and 52b of the outer cylinder 50 and the recess 35 can be ensured, the fastening between the outer cylinder 50 and the stator core 30 is ensured. It becomes possible.

  Furthermore, in the fastening step 204, when the tip portions of the first and second fastening portions 52a and 52b are plastically deformed radially inward, the recesses 35 are formed on the inner peripheral surfaces of the first and second fastening portions 52a and 52b. An engaging step portion 59 that engages with the opening edge portion of the opening is formed. As a result, the circumferential gap formed between the engagement step portion 59 and the opening edge portion can be reliably reduced. Therefore, since the circumferential engagement between the first and second fastening portions 52a, 52b of the outer cylinder 50 and the recess 35 of the stator core 30 can be further ensured, the outer cylinder 50 and the stator core 30 It is possible to further secure the fastening.

Other Embodiment
The present invention is not limited to the above-described first to fourth embodiments, and various modifications can be made without departing from the spirit of the present invention.

  For example, in the first to fourth embodiments, the fastening portion of the outer cylinder 50 and the concave portion 35 of the stator core 30 are provided in a portion corresponding to one split core 32. Each of the divided cores 32 divided in the direction may be provided. In this way, since each divided core 32 is fastened to the outer cylinder 50, it is possible to suppress the movement of each divided core 32 when inputting fine vibration or the like.

  DESCRIPTION OF SYMBOLS 1 ... Rotary electric machine, 10 ... Housing, 11, 12 ... Bearing, 13 ... Rotating shaft, 14 ... Rotor, 20 ... Stator, 30 ... Stator core, 31 ... Slot, 32 ... Split core, 33 ... Teeth part, 34 ... Back core part, 35 ... Recessed part, 35a ... First recessed part, 35b ... Second recessed part, 40 ... Stator winding, 42 ... Coil end part, 45 ... Conductor, 50 ... Outer cylinder, 51, 53, 55, 57 ... Slit, 51a, 53a, 55a, 57a ... First slit, 51b, 53b, 55b, 57b ... Second slit, 54 ... Fastening part, 52a, 56a, 58a ... First fastening part, 52b, 56b, 58b ... 2nd fastening part, 56c ... 3rd fastening part, 56d ... 4th fastening part, 59 ... Engagement step part, 61, 62 ... Punch, 63 ... Die.

Claims (12)

A stator core formed by laminating a plurality of divided cores formed by laminating a plurality of steel plates in the axial direction and divided in the circumferential direction, and a stator winding wound around the stator core; In a stator of a rotating electrical machine comprising an outer cylinder fitted and fastened to the outer periphery of the stator core,
The stator core has a recess on the outer peripheral surface,
The outer cylinder includes a plurality of second slits extending in the circumferential direction through the outer peripheral surface and the inner peripheral surface, and first slits extending in the axial direction between the second slits. A fastening portion formed at a portion surrounded by the outer tube, and at least a part of the fastening portion is plastically deformed radially inward and circumferentially and engaged with the recess. A stator of a rotating electric machine, wherein a plurality of the steel plates of the stator core are fastened.   The slit has a first slit extending in an axial direction and a second slit extending in a circumferential direction, and the first slit and the second slit intersect with each other. The stator of the rotary electric machine according to 1.   The stator of the rotating electrical machine according to claim 1, wherein the fastening portion and the recess are joined.   The stator of the rotating electrical machine according to any one of claims 1 to 3, wherein surfaces of the fastening portion and the recess that are opposed to each other in the circumferential direction are engaged with each other.   The stator of a rotating electrical machine according to any one of claims 1 to 4, wherein the fastening portion and the recess are provided for each of the divided cores divided in the circumferential direction.   The stator of a rotating electrical machine according to any one of claims 1 to 5, wherein the fastening portion and the recess are fixed by welding.   The said outer cylinder is fitted by the outer periphery of the said stator core in the state which has a clearance gap between the outer peripheral surfaces of the said stator core, The any one of Claims 1-6 characterized by the above-mentioned. Stator of rotating electrical machine. A stator core formed by laminating a plurality of steel plates in the axial direction and assembled in a ring shape with a plurality of divided cores divided in the circumferential direction; A stator winding wound around the stator core, and a method for manufacturing a stator of a rotating electrical machine comprising:
The stator core having a recess formed on the outer peripheral surface of the predetermined split core, a plurality of second slits extending in the circumferential direction through the outer peripheral surface and the inner peripheral surface, and an axial extension between the second slits. A preparation step of preparing the outer cylinder, in which a first slit is formed in a predetermined portion and a fastening portion is formed in a portion surrounded by the first and second slits,
An assembly step of assembling the stator winding and the stator core;
The outer cylinder is fitted to the outer periphery of the stator core, and at least a part of the fastening portion is plastically deformed radially inward and circumferentially to be engaged with the recess of the stator core. Fastening step of fastening the outer cylinder and the plurality of steel plates of the stator core by,
The manufacturing method of the stator of the rotary electric machine characterized by having.   9. The method of manufacturing a stator for a rotating electrical machine according to claim 8, wherein a preliminary bending step of plastically deforming at least a part of the fastening portion radially inward before the fastening step is performed.   In the fastening step, after the outer cylinder is fitted to the outer periphery of the stator core, the outer cylinder is compressed from the outer peripheral side and elastically deformed, and at least a part of the fastening portion is radially inward. The method for manufacturing a stator of a rotating electric machine according to claim 8 or 9, wherein the stator is plastically deformed sideways.   In the fastening step, when at least a part of the fastening portion is plastically deformed radially inward, an engagement step portion that engages with the opening edge portion of the recess is formed on the inner peripheral surface of the fastening portion. The method of manufacturing a stator for a rotating electrical machine according to claim 10.   12. The fastening process according to claim 8, wherein in the fastening step, the outer cylinder is fitted to the outer periphery of the stator core with a gap between the outer cylinder and the outer peripheral surface of the stator core. The manufacturing method of the stator of the rotary electric machine as described in a term.

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