JP2011004456A - Motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a motor in which a deformation amount of a coil is reduced.SOLUTION: The motor is provided with: a stator 1 having a stator core formed in a cylindrical shape by coupling a plurality of stator core pieces 11 and winding inserted into a slot part formed between teeth parts of the adjacent stator core piece and with a rotor. The winding is constituted of a first winding 20U, second winding 20V and third winding 20W, which constitute three phases. One end-side of the winding is inserted into one slot part in the two separated different slot parts, and an other end-side into the other slot part. The first winding, the second winding and the third winding are arranged so that a first winding bridging part 35U in the first winding, a second winding bridging part 35V in the second winding and a third winding bridging part 35W in the third winding mutually cross. One end-side of one winding and the other end-side of the other winding in the adjacent windings of the same phase are inserted into the same slot part.

Description

  The present invention relates to a motor.

  In the inner rotor type motor, a rotor (rotor) is disposed in a space formed inside a cylindrical stator, and the rotor is configured to be rotatable with respect to the stator. A coil is wound around a slot portion formed between adjacent teeth portions of the stator, and distributed winding or concentrated winding is known as a winding method of the coil. Generally, since it is easier to maintain high torque density performance when winding a coil with distributed winding, distributed winding is often employed in motors that require high torque.

  However, distributed winding is different from concentrated winding, because the coil is wound so as to span between slots separated by a predetermined distance, so that the winding method becomes complicated, coil winding work takes time, and production efficiency is reduced. It was falling.

  Therefore, in order to improve the coil density (space factor) in the slot part and to improve the efficiency of coil winding work, the coil is wound in a state where the stator is divided and the stator core pieces are arranged in a strip shape, Then, the method of manufacturing a stator by making a stator core piece cylindrical shape is proposed (for example, refer to patent documents 1).

  By the way, in Patent Document 2, in the coil winding method as in Patent Document 1, the height of the coil ends (crossover portions) protruding from both axial end surfaces of the stator is increased, so that the motor is reduced in size. For the purpose, a coil winding method that can reduce the height of the crossover has been proposed.

  Specifically, for the purpose of reducing the overhang height of the coil end portion of the stator, the stator of Patent Document 2 has two slots (in which the first winding U1 is housed (see FIG. 19). A second winding W1 having a phase different from that of the first winding U1 is accommodated in a slot (slot number 3) between the slot numbers 1 and 6), and between the two slots in which the first winding U1 is accommodated. The third winding W6 having the same phase as the second winding is accommodated in the slot (slot number 2), and the second winding W1 and the third winding W6 are arranged at one end (winding) at the coil end portion. The distributed winding is arranged such that W6) is located on the outer peripheral side of the first winding U1 and the other (winding W1) is located on the inner peripheral side of the first winding U1.

JP-A-9-103052 JP 2002-44893 A

  Therefore, in order to improve the space factor of the coil in the slot, increase the efficiency of coil winding work, and reduce the size of the motor, the coil is wound by the method of Patent Document 2 in a state where the stator core pieces are arranged in a belt shape. Then, a method of manufacturing a stator by making the stator core piece cylindrical is examined.

  In this case, as shown in FIG. 20, the coil 220 formed in an annular shape in advance is arranged so as to be bridged in a slot portion 219 formed between the teeth portions 215 and 215 of the predetermined adjacent stator core pieces 211 and 211. Furthermore, as shown in FIG. 21, since the transition portions 235U, 235V, and 235W of the coils 220U, 220V, and 220W of the respective phases need to be arranged so as to cross each other, first of the annular coil 220, After one end side is disposed in the slot portion 219 and the coil 220 of the other phase is disposed in the adjacent desired slot portion 219, the other end side needs to be disposed in another desired slot portion 219.

  At this time, as shown in FIG. 22, in the case of a multi-pole / multi-slot, in order to avoid interference with adjacent coils, the coil 220 protruding from the slot 219 is extremely deformed at the transition portion protruding from the slot. The crossover portion 235 passes over the yoke portion. As described above, when the deformation amount of the coil 220 increases, as shown in FIGS. 23 and 24, in the bent portion C of the conductive wire constituting the coil 220, the coating of the conductive wire forming the coil 220 may be broken. There is a problem that the insulation of the coil 220 is lowered.

  The present invention has been made in view of the above circumstances, and provides a motor capable of reducing the amount of deformation of a coil.

  In order to solve the above-mentioned problem, the invention described in claim 1 is a stator core piece (for example, a tooth core (for example, the yoke 13 in the embodiment)) in which a teeth portion (for example, the tooth 15 in the embodiment) and a yoke portion (for example, the yoke 13 in the embodiment) are formed. A plurality of core pieces 11) in the embodiment are connected to form a cylindrical stator core (for example, the stator core 10 in the embodiment) and a slot portion (for example, an implementation) formed between the teeth portions of the adjacent stator core pieces. A stator (for example, the stator 1 in the embodiment) having windings (for example, the coil 20 in the embodiment) inserted in the slot 19) in the form, and arranged on the inner peripheral side of the stator so as to be rotatable. A motor having a supported rotor, wherein the winding is a first winding (e.g. Coil 20U) in the state, a second winding (for example, coil 20V in the embodiment) and a third winding (for example, coil 20W in the embodiment), each of the windings being separated by two different slot portions. One end side (for example, one end side 20a in the embodiment) is inserted into one of the two, the other end side (for example, the other end side 20b in the embodiment) is inserted into the other, and the stator core of the first winding is inserted. A first winding transition portion (for example, a transition portion 35U in the embodiment) protruding from the axial end surface, and a second winding transition portion (for example, in the embodiment) protruding from the axial end surface of the stator core in the second winding. A transition portion 35V) and a third winding transition portion protruding from the axial end surface of the stator core in the third winding (for example, in the embodiment) The first winding, the second winding, and the third winding are arranged so that the winding portion 35W intersects each other, and one end side and the other winding of one winding in adjacent in-phase windings are arranged. The other end side of the wire is inserted into the same slot portion.

  According to a second aspect of the present invention, a claw portion (for example, the claw portion 30 in the embodiment) protruding in the circumferential direction is formed on the tip of the teeth portion (for example, the tip portion 17 in the embodiment) of the stator core piece. It is formed in one side of the part, The said nail | claw part is facing the same direction, It is characterized by the above-mentioned.

  According to a third aspect of the present invention, a step portion (for example, the step portion 37 in the embodiment) is formed on the inner peripheral surface (for example, the inner peripheral surface 13a in the embodiment) facing the slot portion in the yoke portion, One end side of the one winding and the other end side of the other winding are arranged so as to be shifted in the radial direction.

  In the invention described in claim 4, the first inclined surface in which the side surface (for example, the side surface 31 in the embodiment) facing the slot portion in the claw portion is formed from the tooth portion side toward the tip of the claw portion. A surface (for example, the first inclined surface 32 in the embodiment), and a second inclined surface (for example, the second inclined surface 33 in the embodiment) that is connected to the first inclined surface and is formed up to the tip of the claw portion. The inclination angle (for example, the inclination angle θ1 in the embodiment) formed by the first inclined surface and the side surface of the slot portion (for example, the side surface 15a in the embodiment) is the second inclined surface and the slot. It is characterized by being smaller than an inclination angle (for example, an inclination angle θ2 in the embodiment) formed with the side surface of the portion.

  According to the first aspect of the present invention, the distance between adjacent slot portions can be increased by inserting two in-phase windings in one slot portion. Therefore, the amount of deformation at the transition portion of the winding can be reduced. As a result, it is possible to prevent damage to the coating of the conductive wire constituting the winding, and to ensure the insulation performance of the winding.

  According to the second aspect of the present invention, the claw portion formed at the tip of the tooth portion is formed only on one side of the tooth portion, so that when the winding is inserted into the slot portion, it is inserted while avoiding the claw portion. Since it is not necessary, the overall length of the winding can be shortened. Accordingly, the resistance generated in the winding can be reduced, and the height of the transition portion of the winding protruding from both axial end surfaces of the stator can be suppressed.

  According to the third aspect of the present invention, the amount of deformation of the winding can be further reduced by providing a step at two in-phase winding positions inserted in one slot portion. As a result, it is possible to more effectively prevent damage to the coating of the conducting wire constituting the winding, and to ensure the insulation performance of the winding.

  According to the invention described in claim 4, since the claw portion formed at the tip of the tooth portion can be formed only on one side of the tooth portion and the width of the claw portion can be maximized as much as possible. Ripple can be reduced.

It is a top view of the stator in the embodiment of the present invention. It is a top view of the stator core in the embodiment of the present invention. It is a top view of the core piece in the embodiment of the present invention. It is a perspective view at the time of the strip | belt shape of the core piece in embodiment of this invention. It is a partial top view at the time of the strip | belt shape of the core piece in embodiment of this invention. It is a perspective view which shows the structure of the coil in embodiment of this invention. It is explanatory drawing which shows the insertion method to the slot part of the coil in embodiment of this invention. It is a perspective view which shows the state which inserted all the coils in the slot part in embodiment of this invention. It is a perspective view which shows the arrangement | positioning method of the coil in embodiment of this invention. It is a schematic plan view at the time of the cylindrical shape of the core piece in embodiment of this invention. It is a perspective view of the stator in the embodiment of the present invention. It is explanatory drawing (1) which shows the procedure which attaches the coil in embodiment of this invention to a core piece. It is explanatory drawing (2) which shows the procedure which attaches the coil in embodiment of this invention to a core piece. It is explanatory drawing (3) which shows the procedure which attaches the coil in embodiment of this invention to a core piece. It is a fragmentary top view explaining the effect at the time of attaching the coil in the embodiment of the present invention to the core piece. It is a perspective view which compares the coil in embodiment of this invention with the conventional coil, (a) The coil of this embodiment, (b) The conventional coil. It is a fragmentary top view (1) which shows another aspect of the front-end | tip part of the teeth in embodiment of this invention. It is a fragmentary top view (2) which shows another aspect of the front-end | tip part of the teeth in embodiment of this invention. It is a top view of the conventional stator. It is explanatory drawing (1) which shows the procedure which attaches a coil to the conventional strip | belt-shaped core piece. It is explanatory drawing (2) which shows the procedure which attaches a coil to the conventional strip | belt-shaped core piece. It is explanatory drawing which shows the state which attached the coil to the conventional strip | belt-shaped core piece. It is explanatory drawing which shows only the coil of the state of FIG. It is the A section enlarged view of FIG.

Next, an embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is a plan view of the stator. In FIG. 1, the coil 20 is shown in a sectional view on the surface of the stator core 10. As shown in FIG. 1, the stator 1 includes a stator core 10 configured in a cylindrical shape, and a coil 20 disposed in a slot 19 formed between adjacent teeth 15 of the stator core 10. . In a space formed at the center of the cylindrical shape of the stator 1, a rotor (not shown) is rotatably arranged.

  FIG. 2 is a plan view of the stator core. As shown in FIG. 2, the stator core 10 is configured by connecting a plurality of core pieces 11 in a cylindrical shape. The stator core 10 includes a yoke 13 that forms a cylindrical outer periphery, teeth 15 that protrude from the yoke 13 toward the center of the cylinder, and a tip 17 that forms the tip of the teeth 15. A slot 19 is formed between adjacent teeth 15 and 15. Then, by arranging the coil 20 in the slot 19, the stator 1 is formed as described above.

  FIG. 3 is a plan view of the core piece 11. As shown in FIG. 3, the core piece 11 is configured by laminating a flat steel plate 51 on which a yoke 13, a tooth 15, and a tip end portion 17 are formed. The flat steel plate 51 constituting the core piece 11 can be easily manufactured by press molding. One tooth 15 is formed on one core piece 11. That is, the core piece 11 is divided for each tooth 15.

  Further, both side portions of the yoke 13 in the circumferential direction are formed in a substantially linear shape so that one side portion 23 and the other side portion 25 are in contact with each other. The one side portion 23 and the other side portion 25 adjacent to each other are separated when the adjacent core piece 11 is strip-shaped, and are configured to contact when the core piece 11 is deformed from a strip shape to a cylindrical shape. ing.

  Here, in the present embodiment, a claw portion 30 that protrudes in the circumferential direction when the core piece 11 is connected in an annular shape is formed only on one side of the tip portion 17 of the tooth 15. That is, the claw portion 30 is formed to project in a direction substantially orthogonal to the extending direction of the teeth 15. The claw portion 30 has a length that is positioned with a slight gap from the tip portion 17 of the adjacent core piece when the core pieces 11 are connected in an annular shape.

  Further, the side surface 31 of the claw portion 30 facing the slot 19 includes a first inclined surface 32 formed from the teeth 15 toward the tip of the claw portion 30, and a tip of the claw portion 30 connected to the first inclined surface 32. And a second inclined surface 33 formed as described above. Here, an angle θ1 formed between the first inclined surface 32 and the side surface 15a of the slot 19 is smaller than an angle θ2 formed between the second inclined surface 33 and the side surface 15a of the slot 19. That is, the width of the claw portion 30 gradually increases from the tip of the claw portion 30 toward the teeth 15.

  The slot 19 has a size that allows two sets (two) of in-phase coils 20 to be arranged. Further, a step portion 37 is formed on the inner peripheral surface 13 a facing the slot 19 in the yoke 13. The step portion 37 is formed so that one side portion 23 side of the yoke 13 protrudes radially inward. By forming in this way, one winding 20A and the other winding 20B arranged in the slot 19 are arranged so as to be shifted in the radial direction (see FIG. 1).

Next, a procedure for connecting the core pieces 11 to form the stator 1 will be described.
FIG. 4 is a perspective view of the core piece in a band shape, and FIG. 5 is a partial plan view of the core piece in a band shape. As shown in FIGS. 4 and 5, a plurality of core pieces 11 having a desired thickness are formed by laminating and joining a plurality of flat steel plates 51. Then, the core pieces 11 are arranged in a strip shape in the same direction.

  After all the core pieces 11 are connected, the insulating paper 29 is disposed along the side surface of the slot 19. After the insulating paper 29 is disposed, the coil 20 is disposed in the slot 19. Specifically, as shown in FIG. 6, a plurality of ring-shaped coils 20 are formed by a winding device (not shown). At this time, both ends of the conductive wire constituting the coil 20 are extended from the ring so that they can be connected to the power supply terminal and the ground terminal. In the present embodiment, 24 coils 20 are manufactured in advance.

  FIG. 7 is an explanatory view showing a method of inserting the coil into the slot portion. As shown in FIG. 7, the coil 20 constitutes a three-phase U phase, V phase, and W phase. In the present embodiment, the stator core 10 is configured using 24 core pieces 11. That is, 24 slots 19 are formed. Here, the coil 20U configuring the U phase is configured by using eight ring-shaped coils 20 (rings U1 to U8). Similarly, the coil 20V configuring the V phase is configured using the rings V1 to V8, and the coil 20W configuring the W phase is configured using the rings W1 to W8. These rings are formed in such a size that they can be inserted into two slots 19 spaced apart from each other. Then, after the coil 20 is manufactured, the coil 20 is inserted into the slot 19 of the stator core 10.

  Specifically, U-phase coil 20U inserts ring U1 into slot 19 with slot number 1 and slot number 4, inserts ring U2 into slot 19 with slot number 4 and slot number 7, and so on. Ring U8 is inserted into slot 19 with slot number 22 and slot number 1. The V-phase coil 20V inserts the ring V1 into the slot 19 with the slot number 23 and the slot number 2, inserts the ring V2 into the slot 19 with the slot number 2 and the slot number 5, and similarly, The ring V8 is inserted into the slot 19 with the slot number 23. Further, the W-phase coil 20W inserts the ring W1 into the slot 19 with the slot number 24 and the slot number 3, inserts the ring W2 into the slot 19 with the slot number 3 and the slot number 6, and similarly with the slot number 21 and The ring W8 is inserted into the slot 19 with the slot number 24. That is, two sets of in-phase coils 20 are inserted into each slot 19.

  FIG. 8 is a perspective view showing a state where the coil 20 is inserted into the strip-shaped core piece 11, except for one end portion (A portion) of the ring V 1 and one end portion (B portion) of the ring W 1 in the desired slot 19. Has been placed. In this state, the core piece 11 is deformed into an annular shape, and the one end of the remaining ring V1 and one end of the ring W1 are inserted into a desired slot 19 to complete the stator 1 (described in detail later).

Next, a procedure for inserting the coil 20 into the slot 19 will be described. In the following description, the slot 19 will be described using only the slot number.
FIG. 9 is a perspective view showing the coil arrangement state, and FIG. 10 is a plan view of the core piece in a cylindrical shape. In the present embodiment, the coil is inserted into the strip-shaped core piece before being cylindrical, but here, description will be given with reference to FIG. 10 showing the core piece after being cylindrical.

  As shown in FIGS. 9 and 10, the ring V1 of the coil 20V constituting the V phase is inserted into the slot number 2. At this time, the other side of ring V1 (part A in FIG. 7) cannot be inserted into slot number 23, and is left as it is. Next, the ring W1 of the coil 20W constituting the W phase is inserted into the slot number 3. At this time, the other side of ring W1 (B portion in FIG. 7) cannot be inserted into slot number 24, so it is left as it is. Next, the 20 U ring U 1 constituting the U phase is inserted into the slot number 4. At this time, the other side of the ring U1 is temporarily inserted into the slot number 1.

  Next, the ring V2 of the V-phase coil 20V is inserted so as to span the slot number 2 and the slot number 5. At this time, the ring V2 is inserted into the slot number 5 and then inserted into the slot number 2 to place the ring V2. By doing so, the ring V2 can be smoothly inserted without interfering with the claw portion 30.

  Similarly, after inserting the ring W2 of the W-phase coil 20W so as to span the slot number 3 and the slot number 6, the ring U2 of the U-phase coil 20U is inserted so as to span the slot number 4 and the slot number 7. To do. By repeating this procedure, V 3 → W 3 → U 3 → V 4 →... → V 8 → W 8 → U 8 are inserted into the slots 19.

  When the coil 20 is inserted into the slot 19 in this way, the coils 20U, 20V, and 20W are arranged so that the transition portions 35U, 35V, and 35W protruding from both axial end surfaces of the stator core 10 intersect each other.

  In this way, the band-shaped core piece 11 is deformed into a cylindrical shape in a state where the A part of the ring V1 and the B part of the ring W1 are not inserted into the slot 19, and the core pieces 11 at both ends at the time of the band shape are connected to each other. As shown in FIG. Then, if necessary, the ring U1 temporarily inserted into the slot number 1 is once removed, and the ring V1 (part A in FIG. 7) of the V-phase coil 20V not inserted into the slot 19 is assigned to the slot number 23. insert. Thereafter, the ring W1 (part B in FIG. 7) of the W-phase coil 20W is inserted into the slot number 24. When the coils 20 are inserted into all the slots 19, the stator 1 is inserted into a housing (not shown). And after adjusting a conducting wire so that each coil 20U, 20V, 20W inserted in the slot 19 does not loosen, the conducting wire extended from the both ends of each coil 20U, 20V, 20W is made into U phase, V phase, and Connect to the W-phase power supply terminal and ground terminal.

  Here, the method for inserting the coil 20 into the slot 19 will be described in more detail. Here, a method of inserting the ring U1 into the slot 19 will be described, but other rings are inserted by the same method.

  As shown in FIG. 12, the claw portion 30 is formed only on one end portion 17 of the core piece 11. When inserting the ring U 1, first, the one end side 20 a of the ring U 1 is inserted into the slot number 4.

  Subsequently, as shown in FIG. 13, the one end side 20 a of the ring U <b> 1 is brought into contact with the side surface (side surface of the tooth 15) 15 a of the slot 19 on the slot number 1 side.

  Subsequently, as shown in FIG. 14, the other end 20 b of the ring U 1 is inserted into the slot number 1. The other end side 20b of the ring U1 is formed to have a size that slightly avoids the tip end corner portion of the slot 19 on the slot number 4 side. By comprising in this way, the length of the transition part 35 of the coil 20 can be shortened.

  Further, as shown in FIG. 15, by arranging two sets of in-phase coils 20 in one slot 19, the number of core pieces 11 can be halved. Accordingly, since the number of slots 19 is also halved, the distance L1 between adjacent slots 19 can be increased. Then, for example, the ring U1 and the ring V1 immediately cross each other at the crossing portion 35 exiting from the slot 19, but since the distance L1 is large, it is not necessary to bend the coil 20 suddenly. 20 can be crossed without applying a load.

  That is, as shown in FIG. 16, the coil 20 (FIG. 16A) of the present embodiment has a sharp bend formed in the conventional coil 220 (see FIGS. 16B, 23, and 24). The part C is eliminated and the load applied to the coil 20 can be suppressed. In other words, the angle formed by the straight portion formed along the yoke 13 in the transition portion 35 and the inclined portion extending from the straight portion to the slot 19 is gentler in the coil 20.

  As described above, since the conductor coil is wound in advance to form the annular coil 20 having a size corresponding to the slot 19, the coil 20 can be attached simply by inserting the coil 20 formed in a ring shape into the slot 19. Can do. Therefore, the production efficiency can be improved as compared with the case where the coil is formed while winding the conductive wire around the slot 19 after preparing the core piece 11.

  Further, since the coils 20 (20a, 20b, 20c) constituting the U-phase, V-phase, and W-phase forming the rotating magnetic field of the motor are all formed in the same shape, the three-phase composed of the U-phase, V-phase, and W-phase. In manufacturing the motor, the coil 20 (20U, 20V, 20W) corresponding to each phase can be manufactured in the same process. Therefore, production efficiency can be improved.

  According to this embodiment, by inserting the two coils 20 having the same phase into one slot 19, the distance L <b> 1 between the adjacent slots 19 can be increased. Therefore, the amount of deformation at the transition portion 35 of the coil 20 can be reduced. As a result, it is possible to prevent damage to the coating of the conductive wire that constitutes the coil 20, and to ensure the insulation performance of the coil 20.

  Further, by forming the claw portion 30 formed on the tip portion 17 of the tooth 15 only on one side of the tooth 15, it is not necessary to avoid the claw portion 30 when inserting the coil 20 into the slot 19. The overall length of the coil 20 can be shortened. Therefore, the resistance generated in the coil 20 can be reduced, and the height of the transition portion 35 of the coil 20 protruding from both axial end surfaces of the stator 1 can be suppressed.

  Further, by providing the stepped portion 37 so that the two in-phase coils 20 inserted into one slot 19 are displaced in the radial direction, the deformation amount of the coil 20 can be further reduced. As a result, it is possible to more effectively prevent damage to the coating of the conductive wire constituting the coil 20, and to ensure the insulation performance of the coil 20.

  Furthermore, the first inclined surface 32 and the second inclined surface 33 are formed while forming the claw portion 30 formed on the tip portion 17 of the tooth 15 only on one side of the tooth 15, and the width of the claw portion 30 is maximized as much as possible. The torque ripple can be reduced because it is made as wide as possible.

  The technical scope of the present invention is not limited to the above-described embodiment, and includes various modifications made to the above-described embodiment without departing from the spirit of the present invention. That is, the specific structure and configuration described in the embodiment are merely examples, and can be changed as appropriate.

  For example, as shown in FIGS. 17 and 18, the shape of the end portion 17a on the side where the claw portion 30 is not formed in the tip portion 17 of the core piece 11 of the present embodiment may be formed into a curved surface shape or a chamfered shape. Good. By forming in this way, it is possible to more effectively prevent the coil 20 from being damaged when the coil 20 is inserted into the slot 19.

  DESCRIPTION OF SYMBOLS 1 ... Stator 10 ... Stator core 11 ... Core piece (stator core piece) 13 ... Yoke (yoke part) 13a ... Inner peripheral surface 15 ... Teeth (tooth part) 15a ... Side surface 17 ... Tip part (tip part) 19 ... Slot (slot part) 20 ... Coil (winding) 20U ... Coil (first winding) 20a ... One end side 20b ... Other end side 20V ... Coil (second winding) 20W ... Coil (third winding) 30 ... Claw part 31 ... Side 32 ... 1st inclined surface 33 ... 2nd inclined surface 35U ... Transition part (1st winding transition part) 35V ... Transition part (2nd winding transition part) 35W ... Transition part (3rd winding transition part) 37 ... Stepped portion θ1 ... Inclination angle θ2 ... Inclination angle

Claims (4)

A stator core formed in a cylindrical shape by connecting a plurality of stator core pieces formed with teeth and yokes, and a winding inserted in a slot formed between the teeth of adjacent stator core pieces. A stator with
In a motor having a rotor arranged on the inner peripheral side of the stator and rotatably supported,
The winding is composed of a first winding, a second winding, and a third winding constituting three phases,
The winding has one end inserted into one of two different slot portions spaced apart from each other and the other end inserted into the other,
In the first winding transition portion protruding from the axial end surface of the stator core in the first winding, in the second winding transition portion protruding from the axial end surface of the stator core in the second winding, and in the third winding The first winding, the second winding, and the third winding are arranged so that third winding transitions protruding from the axial end surface of the stator core intersect each other, and one of the adjacent in-phase windings One end side of the other winding and the other end side of the other winding are inserted in the same slot portion.   The claw part protruding in the peripheral direction is formed in one end of the teeth part at the tip of the teeth part in the stator core piece, and the claw part is arranged facing the same direction. The motor described.   A step portion is formed on an inner peripheral surface of the yoke portion facing the slot portion, and one end side of the one winding and the other end side of the other winding are arranged so as to be shifted in the radial direction. The motor according to claim 1, wherein: A side surface of the claw portion facing the slot portion is formed with a first inclined surface formed from the teeth portion side toward the tip of the claw portion, and connected to the first inclined surface to the tip of the claw portion. A second inclined surface formed,
The inclination angle formed by the first inclined surface and the side surface of the slot portion is smaller than the inclination angle formed by the second inclined surface and the side surface of the slot portion. The motor described in.

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