JP2018148667A - Rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary electric machine capable of achieving downsizing.SOLUTION: A coil 20 is attached to a tooth portion 16 of a stator core 10. Three-phase lead wires 21, 22 and 23, and three-phase neutral point extension lines 41, 42, and 43 are extended from the coil 20. The three-phase lead wires 21, 22, and 23 are held by a holder 30. The three-phase neutral point extension lines 41, 42, and 43 are electrically connected by a neutral point bus bar 50. The holder 30 is disposed side by side with a yoke portion 12 in an axial direction, and the neutral point bus bar 50 is disposed side by side with the tooth portion 16 in the axial direction.SELECTED DRAWING: Figure 7

Description

  The present disclosure relates to a rotating electrical machine.

  A connection structure of coil windings in a stator in which in-phase coil windings are connected via a conductor is disclosed in, for example, Japanese Patent Laid-Open No. 6-233383 (Patent Document 1).

Japanese Patent Laid-Open No. 6-233383

  In the configuration described in Japanese Patent Laid-Open No. 6-233383 (Patent Document 1), a connection unit for connecting one end and the other end of coil windings in the same phase is arranged side by side with the coil end in the axial direction of the stator. ing. Due to this arrangement, there is a limit to reducing the dimension of the stator in the axial direction.

  In the present disclosure, a rotating electrical machine that can be reduced in size is provided.

  According to the present disclosure, a rotating electrical machine is provided that includes a stator core, a three-phase coil, a three-phase lead wire and a three-phase neutral point lead wire, a holder, and a neutral point bus bar. The stator core includes a cylindrical yoke portion and a plurality of teeth portions protruding from the yoke portion toward the inside in the radial direction of the yoke portion. A slot extending along the axial direction of the yoke portion is formed between adjacent teeth portions. The three-phase coil is attached to the teeth portion. The three-phase lead wire and the three-phase lead wire for neutral point are drawn from the three-phase coil. The holder holds a three-phase lead wire. The neutral point bus bar electrically connects the three-phase neutral point lead wires. The holder is disposed side by side with the yoke portion in the axial direction, and the neutral point bus bar is disposed side by side with the tooth portion in the axial direction.

  The rotating electrical machine includes an insulating member that electrically insulates the three-phase coil from the stator core. The insulating member has a plate part. The plate part is interposed between the three-phase coil and the yoke part to electrically insulate the three-phase coil from the yoke part. In the radial direction, the plate portion is interposed between the holder and the neutral point bus bar.

  The rotating electrical machine further includes a bus bar holder that holds a neutral point bus bar. The bus bar holder is mounted on the insulating member.

  In the above rotating electric machine, the holder and the bus bar holder overlap each other when viewed in the radial direction.

  According to the present disclosure, the rotating electrical machine can be reduced in size.

It is a fragmentary sectional view which shows schematic structure of an electric compressor provided with the rotary electric machine according to embodiment. It is a perspective view of a stator core. It is a perspective view of an insulating member. It is the perspective view which looked at the insulating member from a different angle. It is a perspective view of the state where the three-phase lead wire for neutral points drawn from the coil was electrically connected. It is a perspective view of a neutral point bus bar and a bus bar holder. It is a side view in the state where a coil was attached to a tooth part via an insulating member.

  Hereinafter, a rotating electrical machine according to an embodiment will be described with reference to the drawings. In the embodiments described below, the same or substantially the same configuration is denoted by the same reference numeral, and repeated description is not repeated.

  FIG. 1 is a partial cross-sectional view showing a schematic configuration of an electric compressor 110 including a rotating electrical machine according to the embodiment. The electric compressor 110 is an electric compressor mounted on a vehicle, and is mounted on a fuel cell vehicle as an example.

  With reference to FIG. 1, the electric compressor 110 includes a housing 112, a compression unit 115, and the electric motor 1.

  An electric motor 1 as an example of a rotating electrical machine according to the present embodiment includes a rotor (rotor) 3 and a stator (stator) 4. The rotor 3 is fixed to the rotating shaft 2. The rotating shaft 2 is rotatably supported in the housing 112 while being inserted into the stator 4. The stator 4 includes a stator core 10 and a coil 20. The stator core 10 is fixed to the inner peripheral surface of the housing 112. The coil 20 is attached to a tooth portion of the stator core 10 described later.

  FIG. 2 is a perspective view of the stator core 10. As shown in FIG. 2, the stator core 10 has a hollow cylindrical outer shape as a whole. In the following embodiments, the axial direction of the cylindrical stator core 10 is simply referred to as the axial direction, the radial direction of the stator core 10 is simply referred to as the radial direction, and the circumferential direction of the stator core 10 is simply referred to as the circumferential direction. .

  The stator core 10 has a plurality of divided stator cores 11 divided in the circumferential direction. More specifically, the stator core 10 has nine divided stator cores 11. Each divided stator core 11 is formed by laminating a plurality of electromagnetic steel plates in the axial direction of the stator core 10 and integrally connecting the electromagnetic steel plates.

  Each divided stator core 11 has an arcuate yoke portion 12 and a plurality of teeth portions 16. The divided stator cores 11 are joined by a yoke portion 12 to form a cylindrical stator core 10. The yoke portion 12 constitutes the outer peripheral portion of the stator core 10. The yoke portion 12 has one axial end face 13 and the other axial end face 14.

  The teeth portion 16 protrudes from the inner peripheral surface of the yoke portion 12 toward the inside in the radial direction of the yoke portion 12. In a state in which the plurality of divided stator cores 11 are combined to form an integral stator core 10, the tooth portions 16 are provided at intervals in the circumferential direction. The teeth portion 16 has a substantially rectangular parallelepiped shape, and is provided such that the longitudinal direction of the teeth portion 16 extends in the axial direction. The teeth part 16 has a protrusion 17 protruding in the circumferential direction at a tip part where the tooth part 16 protrudes from the yoke part 12.

  Slots 18 are formed between adjacent tooth portions 16 in the circumferential direction. The slot 18 extends in the axial direction. The slot 18 opens to the inner periphery of the stator core 10.

  A part of the coil 20 attached to the tooth portion 16 is accommodated in the slot 18. The coil 20 is a round wire having a circular cross section, and is wound around the tooth portion 16.

  The coil 20 is a three-phase coil, and has a U-phase coil, a V-phase coil, and a W-phase coil. The teeth portion 16 to which the U-phase coil is attached, the teeth portion 16 to which the V-phase coil is attached, and the teeth portion 16 to which the W-phase coil is attached are arranged in this order in the circumferential direction. With respect to the tooth part 16 to which the V-phase coil is attached, a U-phase coil is attached to one of the tooth parts 16 adjacent in the circumferential direction, and a W-phase coil is attached to the other.

  In the following embodiments, the U phase is the first phase, the V phase is the second phase, and the W phase is the third phase.

  FIG. 3 is a perspective view of the insulating member 60. 4 is a perspective view of the insulating member 60 shown in FIG. 3 as seen from different angles. The insulating member 60 is a member that exists between the coil 20 and the stator core 10 and insulates the coil 20 from the stator core 10. The insulating member 60 is made of an insulating material such as a resin material typified by PPS (Polyphenylene Sulfide) and LCP (Liquid Crystal Polymer).

  As shown in FIGS. 3 and 4, the insulating member 60 has a half-cracked cylindrical teeth receiving portion 61. The teeth receiving portion 61 is formed in a hollow shape, and a space 63 is formed therein. The teeth receiving portion 61 has a shape that can receive the teeth portion 16 of the stator core 10.

  The insulating member 60 has a plate portion 62 provided at one end of the teeth receiving portion 61 and an overhanging portion 64 provided at the other end of the teeth receiving portion 61. The plate portion 62 and the overhang portion 64 are provided at the edge portion of the teeth receiving portion 61 so as to protrude outward with respect to the half-cracked cylindrical teeth receiving portion 61.

  The insulating member 60 has a flat holder mounting portion 65. The holder mounting portion 65 protrudes from the plate portion 62 in the direction opposite to the teeth receiving portion 61. The holder mounting portion 65 is formed with a fitting hole 66 that penetrates the holder mounting portion 65 in the thickness direction. A slit 68 is formed in the plate portion 62. In a state where the insulating member 60 is mounted on the stator core 10, the slit 68 extends in the axial direction. The slit 68 is formed from the edge portion of the plate portion 62 to the bottom portion 69. As shown in FIG. 4, the bottom portion 69 protrudes from the surface of the holder mounting portion 65, and the holder mounting portion 65 and the bottom portion 69 form a step. By forming this step, the W-phase lead wire 23 described later can be easily routed.

  FIG. 5 is a perspective view of a state in which the three-phase neutral point lead wires 41, 42, 43 led out from the coil 20 are electrically connected. As shown in FIG. 5, the electric motor 1 of the embodiment includes a holder 30. Holder 30 holds U-phase lead wire (first phase lead wire) 21, V-phase lead wire (second-phase lead wire) 22, and W-phase lead wire (third-phase lead wire) 23 drawn from coil 20. doing. The holder 30 has a substantially ring-shaped outer shape. The holder 30 has a ring shape corresponding to the cylindrical yoke portion 12. The holder 30 has substantially the same diameter as the yoke portion 12. The three-phase lead wires 21, 22, and 23 are drawn from the outer peripheral surface of the holder 30.

  A neutral point bus bar 50 is disposed on the inner side in the radial direction with respect to the holder 30. The neutral point bus bar 50 is held by a bus bar holder 70. The electric motor 1 according to the embodiment has three neutral point bus bars 50. FIG. 6 is a perspective view of the neutral point bus bar 50 and the bus bar holder 70.

  The neutral point bus bar 50 is a bus bar for electrically connecting the neutral points of the UVW three-phase. As shown in FIGS. 5 and 6, the neutral point bus bar 50 includes a main body 51, a radially extending portion 52, an axially extending portion 53, a circumferentially extending portion 54, and a folded portion 55. Have. The neutral point bus bar 50 has one main body 51. The neutral point bus bar 50 has three radially extending portions 52, an axially extending portion 53, a circumferentially extending portion 54, and a folded portion 55, respectively, corresponding to the UVW three phases.

  The main body 51 has an arc shape. If the main body is formed in an annular shape, the current concentrates, so the main body needs to be thickened. In addition, when the annular main body is formed by press punching, the material at the center of the ring is discarded, and the yield of the material is deteriorated. Therefore, the main body 51 of the embodiment has an arcuate shape that is a part of the annular ring.

  The radially extending portion 52 extends outward in the radial direction with respect to the main body portion 51. The radially extending portion 52 is connected to the main body portion 51 at two end portions of the main body portion 51 in the circumferential direction and a central portion of the main body portion 51 in the circumferential direction. The axially extending portion 53 is connected to the radially extending portion 52 at the distal end where the radially extending portion 52 projects from the main body portion 51 in the radial direction. The axially extending portion 53 extends in the direction away from the stator core 10 with respect to the radially extending portion 52 along the axial direction.

  The circumferentially extending portion 54 is connected to the axially extending portion 53 at the tip end of the axially extending portion 53 protruding from the radially extending portion 52 in the axial direction. The circumferentially extending portions 54 each extend in the counterclockwise direction in the drawing along the circumferential direction. The folded portion 55 is formed by bending the distal end of the circumferentially extending portion 54 protruding in the circumferential direction from the axially extending portion 53, thereby forming a hook shape at the distal end portion of the neutral point bus bar 50. ing. In the hook shape, the tip is directed outward in the radial direction.

  As shown in FIG. 5, the lead wire 41 for the U phase neutral point, the lead wire 42 for the V phase neutral point, and the lead wire 43 for the W phase neutral point each constitute one neutral point bus bar 50. The three circumferentially extending portions 54 and the folded portion 55 are held between the circumferentially extending portion 54 and the folded portion 55. The folded portion 55 is caulked so as to surround the U-phase neutral point lead 41, the V-phase neutral point lead 42 and the W-phase neutral point lead 43, respectively. The V-phase neutral point lead line 42 and the W-phase neutral point lead line 43 are held by the neutral point bus bar 50. As a result, the three-phase neutral point lead wires 41, 42, 43 drawn from the coil 20 are electrically connected via the neutral point bus bar 50 to form a neutral point.

  The neutral point bus bar 50 made of a conductive material is held by a bus bar holder 70 made of an insulating material. Three neutral point bus bars 50 are arranged side by side in the circumferential direction so that the main body portions 51 are along the same circle, and are held by a bus bar holder 70. The bus bar holder 70 has an outer shape with a thin annular plate shape. The bus bar holder 70 according to the embodiment integrally holds three neutral point bus bars 50. A plurality of notches are formed in the outer peripheral edge portion of the bus bar holder 70. These notches function as escape holes 71 in which the neutral point lead lines 41, 42, and 43 are routed.

  FIG. 7 is a side view showing a state where the coil 20 is attached to the tooth portion 16 via the insulating member 60. A pair of insulating members 60 having the same shape as shown in FIGS. 3 and 4 are assembled to the tooth portion 16 from above and below so that the tooth portion 16 is fitted into the space 63 in each tooth receiving portion 61. Accordingly, the insulating cylindrical body formed by the teeth receiving portion 61 of the pair of upper and lower insulating members 60 is mounted around the teeth portion 16.

  The coil 20 is wound around the teeth receiving portion 61. The coil 20 is attached to the tooth portion 16 in a state of being electrically insulated from the tooth portion 16 via the insulating member 60. The coil 20 mounted around the tooth portion 16 has a coil end 24 that protrudes in the axial direction from the axial end surface of the tooth portion 16.

  In a state where the insulating member 60 is mounted on the stator core 10, the plate portion 62 is interposed between the coil 20 and the inner peripheral surface of the yoke portion 12 to electrically insulate the coil 20 from the yoke portion 12. The overhanging portion 64 prevents the coil 20 attached to the insulating member 60 from being collapsed in the inner circumferential direction. The plate portion 62 supports the coil 20 from the outside in the radial direction. The overhanging portion 64 supports the coil 20 from the inside in the radial direction. The coil 20 is supported by the radially inner surface of the plate portion 62 and the radially outer surface of the overhang portion 64. The coil 20 is supported by the mutually opposing surfaces of the plate portion 62 and the overhang portion 64.

  The holder mounting portion 65 is disposed so as to face the axial end surface 13 of the yoke portion 12. The holder 30 is mounted on the holder mounting portion 65. The holder 30 is configured as a member different from the insulating member 60. A holder mounting portion 65 constituting a part of the insulating member 60 is interposed between the axial end surface 13 of the yoke portion 12 and the holder 30. The holder 30 faces the axial end surface 13 of the yoke part 12 and is arranged side by side with the yoke part 12 in the axial direction. A protrusion is formed on the holder 30, and the protrusion 30 is fitted into the fitting hole 66 (FIGS. 3 and 4) of the insulating member 60, so that the holder 30 is attached to the insulating member 60.

  The holder 30 is formed with a first groove 31, a second groove 32, and a third groove 33. The first groove 31, the second groove 32, and the third groove 33 are formed in this order in the axial direction. In the axial direction, a third groove 33, a second groove 32, and a first groove 31 are formed in order from the side closer to the axial end surface 13 of the yoke portion 12. The first groove 31, the second groove 32, and the third groove 33 are open to the outside in the radial direction of the holder 30.

  The holder 30 has convex walls 34 and 35. In the axial direction, a convex wall 35 and a convex wall 34 are arranged in order from the side closer to the axial end face 13 of the yoke portion 12. The convex walls 34 and 35 have a substantially annular flat plate shape. The convex wall 34 is disposed between the first groove 31 and the second groove 32, and separates the first groove 31 and the second groove 32. The convex wall 35 is disposed between the second groove 32 and the third groove 33 and separates the second groove 32 and the third groove 33.

  The U-phase lead wire 21 is routed in the first groove 31. The V-phase lead wire 22 is routed in the second groove 32. The W-phase lead wire 23 is routed in the third groove 33. U-phase lead wire 21, V-phase lead wire 22 and W-phase lead wire 23 are accommodated in different grooves. The convex wall 34 electrically insulates the U-phase lead wire 21 and the W-phase lead wire 22 from each other. The convex wall 35 electrically insulates the V-phase lead wire 22 and the W-phase lead wire 23 from each other.

  As shown in FIG. 7, the bus bar holder 70 in a cross-sectional view has a mounting portion 72 and a fitting portion 73. The mounting portion 72 has a substantially ring-shaped outer shape. The mounting portion 72 is disposed across both the plate portion 62 and the overhang portion 64 of the insulating member 60 in the radial direction (left and right direction in FIG. 7), and the upper edge of the plate portion 62 and the overhang portion 64. It is placed on both the top edge and the top edge. The upper edge of the plate portion 62 is in contact with the outer peripheral edge portion of the mounting portion 72. The upper edge of the overhanging portion 64 is in contact with the inner peripheral edge portion of the mounting portion 72. Thereby, the bus bar holder 70 is mounted on the insulating member 60.

  The neutral point bus bar 50 held by the bus bar holder 70 is arranged side by side with the coil end 24 in the axial direction. The neutral point bus bar 50 is arranged side by side with the teeth portion 16 of the stator core 10 to which the coil 20 is attached in the axial direction.

  The fitting portion 73 is provided so as to protrude from the surface of the mounting portion 72 that contacts the plate portion 62 and the overhang portion 64. In a state where the bus bar holder 70 is mounted on the insulating member 60, the fitting portion 73 is in contact with the inner peripheral surface of the plate portion 62 and is in contact with the outer peripheral surface of the overhang portion 64. The fitting portion 73 is in surface contact with both the plate portion 62 and the surface facing the overhanging portion 64. By providing the fitting portion 73, the bus bar holder 70 is more firmly engaged with the insulating member 60, and the bus bar holder 70 is positioned by the insulating member 60. By fixing the bus bar holder 70 to the insulating member 60, the bus bar holder 70 can be mounted on the insulating member 60 even if the insulating member 60 bends or vibrates.

  In a state where the holder 30 is attached to the insulating member 60 and the bus bar holder 70 is mounted on the insulating member 60, the plate portion 62 of the insulating member 60 is interposed between the holder 30 and the neutral point bus bar 50 in the radial direction. Intervene. The holder 30 and the neutral point bus bar 50 are arranged side by side in the radial direction. The holder 30 and the neutral point bus bar 50 are arranged at positions overlapping each other in the axial direction. The holder 30 and the neutral point bus bar 50 overlap each other when viewed in the radial direction.

  The electric motor 1 according to the embodiment described above is an example of a rotating electric machine, and as shown in FIG. 5, a holder 30 that holds three-phase lead wires 21, 22, and 23, and a three-phase neutral point. And a neutral point bus bar 50 for electrically connecting the lead lines 41, 42, and 43. As shown in FIG. 7, the holder 30 is arranged side by side with the yoke portion 12 of the stator core 10 in the axial direction. The neutral point bus bar 50 is arranged side by side with the tooth portion 16 of the stator core 10 in the axial direction. The holder 30 and the neutral point bus bar 50 are arranged side by side in the radial direction. The holder 30 and the neutral point bus bar 50 are arranged at positions shifted from each other in the radial direction.

  In this way, it is not necessary to arrange the holder 30 and the neutral point bus bar 50 side by side in the axial direction, and the overall dimension of the electric motor 1 in the axial direction can be reduced. Therefore, the electric motor 1 can be reduced in size.

  As shown in FIG. 7, the plate portion 62 of the insulating member 60 is interposed between the holder 30 and the neutral point bus bar 50 in the radial direction. By attaching the bus bar holder 70 to the front end portion of the plate portion 62 disposed between the holder 30 and the neutral point bus bar 50, the holder 30 and the neutral point bus bar 50 can be positioned reliably.

  As shown in FIG. 7, the bus bar holder 70 that holds the neutral point bus bar 50 is mounted on the insulating member 60. In this way, it is possible to reliably realize an arrangement in which the neutral point bus bar 50 is aligned with the tooth portion 16 in the axial direction. By mounting the bus bar holder 70 on the front end portion of the plate portion 62 disposed between the holder 30 and the neutral point bus bar 50, the holder 30 and the neutral point bus bar 50 can be reliably positioned. .

  Further, as shown in FIG. 7, the holder 30 and the bus bar holder 70 overlap each other when viewed in the radial direction. If the holder 30 and the bus bar holder 70 are arranged in this manner, the axial positions of the holder 30 and the bus bar holder 70 are arranged so as to overlap each other. Therefore, the dimensions of the electric motor 1 in the axial direction. Can be further reduced.

  The rotary electric machine described in the embodiment is the electric motor 1 that drives the compression unit 115 of the electric compressor 110, but may be a motor used for other purposes. Alternatively, the rotating electrical machine may be a generator that generates power by receiving power.

  Although the embodiment has been described as described above, it should be considered that the embodiment disclosed this time is illustrative and not restrictive in all respects. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  DESCRIPTION OF SYMBOLS 1 Electric motor, 2 Rotating shaft, 3 Rotor, 4 Stator, 10 Stator core, 12 Yoke part, 13, 14 Axial end face, 16 Teeth part, 18 slot, 20 Coil, 21, 22, 23 Lead wire, 30 Holder, 31 First groove, 32 Second groove, 33 Third groove, 34, 35 Convex wall, 41, 42, 43 Neutral point leader, 50 Neutral point bus bar, 51 Main body part, 52 Radial extension part, 53 Axial extension part, 54 Circumferential extension part, 55 Folding part, 60 Insulating member, 62 Plate part, 64 Overhang part, 65 Holder mounting part, 70 Bus bar holder, 71 Relief hole, 72 Mounting part, 73 Fitting Part, 110 electric compressor, 115 compression part.

Claims (4)

A cylindrical yoke portion and a plurality of teeth portions projecting inward in the radial direction of the yoke portion from the yoke portion, and extending along the axial direction of the yoke portion between adjacent teeth portions A stator core formed with slots, and
A three-phase coil mounted on the teeth portion;
A three-phase lead wire and a three-phase neutral point lead wire drawn from the three-phase coil;
A holder for holding the three-phase lead wire;
A neutral point bus bar for electrically connecting the three-phase neutral point lead wire,
The rotating electric machine, wherein the holder is arranged side by side with the yoke part in the axial direction, and the neutral point bus bar is arranged side by side with the tooth part in the axial direction. An insulating member that electrically insulates the three-phase coil from the stator core;
The insulating member includes a plate portion that is interposed between the three-phase coil and the yoke portion to electrically insulate the three-phase coil from the yoke portion,
The rotating electrical machine according to claim 1, wherein the plate portion is interposed between the holder and the neutral point bus bar in the radial direction. A bus bar holder for holding the neutral point bus bar;
The rotating electrical machine according to claim 2, wherein the bus bar holder is mounted on the insulating member.   The rotating electrical machine according to claim 3, wherein the holder and the bus bar holder overlap each other when viewed in the radial direction.

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