WO2021205653A1

WO2021205653A1 - Electric motor stator and electric motor

Info

Publication number: WO2021205653A1
Application number: PCT/JP2020/016131
Authority: WO
Inventors: 諒石田; 雄哉横手; 大揮内藤
Original assignee: 三菱電機株式会社
Priority date: 2020-04-10
Filing date: 2020-04-10
Publication date: 2021-10-14

Abstract

This electric motor stator is provided with: a stator core having a plurality of teeth; coils wound continuously on a per-phase basis around the plurality of teeth; an insulator for insulating between the coils and the plurality of teeth; a crimp terminal for connecting the coils of the respective phases and forming a neutral point; a lead wire for connecting the coils of the respective phases and a power supply to each other; and a fixing component attached to the insulator. The insulator has a housing portion in which the crimp terminal or the lead wire is housed. The fixing component is attached to the housing portion and configured to fix the crimp terminal or the lead wire.

Description

Motor stator and motor

The present disclosure relates to a stator and a motor of a motor used for a compressor, a generator, or the like.

Conventionally, a stator used in an electric motor such as a compressor or a generator is composed of a coil mounted in a slot between a stator core and a tooth of the stator core. The coil wire forming the coil is insulated and the coil is insulated from the stator core. Further, it is also known that an insulator made of an insulating resin is arranged at a portion where the stator core and the coil are in contact with each other in order to secure sufficient insulation between the stator core and the coil.

Further, in a conventional stator, it is known that the coil between teeth is connected by using a pressure welding terminal and a jumper wire. In this case, for example, in a stator having 9 teeth, 18 pressure welding terminals and 8 jumper wires are required. Therefore, there is a problem that the number of connection parts increases as the number of teeth increases. Therefore, for example, Patent Document 1 proposes to reduce the number of connection parts by connecting coils between teeth by cold pressure welding and winding coil wires continuously around a plurality of teeth.

Japanese Unexamined Patent Publication No. 2014-1945

In the conventional stator, the lead wire or neutral wire connected to the power supply is also fixed by the pressure welding terminal, but if the pressure welding terminal is not used, another fixing method is required for these. Patent Document 1 discloses that the crossover of the neutral wire is bundled by a crimp terminal, but does not disclose how to fix the crossover to the stator core. As a method of fixing the neutral wire or the lead wire, it is conceivable to cover them with an insulating material and then insert them between the coils. However, when the coils are wound at high density, a sufficient gap is provided. Cannot be secured. Further, a method of fixing the neutral wire or the lead wire with a binding thread is also conceivable, but a large number of man-hours are required for assembly.

The present disclosure has been made to solve the above problems, and an object of the present invention is to provide a motor stator and a motor capable of fixing a neutral wire or a lead wire without increasing the number of connection parts and assembly man-hours. And.

The stator of the electric motor according to the present disclosure includes a stator core having a plurality of teeth, a coil continuously wound around the plurality of teeth for each phase, and an insulator for insulating the coil and the plurality of teeth. The insulator is provided with a crimp terminal for connecting each coil to form a neutral point, a lead wire for connecting each phase coil and a power supply, and a fixing component attached to an insulator. Alternatively, it has a storage portion in which the lead wire is stored, and the fixing component is attached to the storage portion to fix the crimp terminal or the lead wire.

According to the present disclosure, the crimp terminal or the lead wire is housed in the housing part of the insulator, and the fixing part is attached and fixed to the storage part, so that the neutral wire or the lead wire is used without increasing the number of connecting parts and the assembly man-hours. The wire can be fixed.

FIG. 5 is a schematic cross-sectional view of the motor according to the first embodiment cut in a plane perpendicular to the shaft. FIG. 5 is a schematic cross-sectional view of the motor according to the first embodiment cut by a plane parallel to the shaft. It is a top view of the stator of the motor which concerns on Embodiment 1. FIG. It is a perspective view of the 1st insulator of the stator which concerns on Embodiment 1. FIG. It is a figure explaining the fixing by the fixing part of the stator which concerns on Embodiment 1. FIG. It is a figure explaining the dimension of the fixed part of the stator which concerns on Embodiment 1. FIG. It is a perspective view of the third insulator of the stator which concerns on Embodiment 1. FIG.

Embodiment 1.
FIG. 1 is a schematic cross-sectional view of the motor 10 according to the first embodiment cut in a plane perpendicular to the shaft 111. FIG. 2 is a schematic cross-sectional view of the motor 10 according to the first embodiment cut in a plane parallel to the shaft 111. As shown in FIGS. 1 and 2, the electric motor 10 includes a stator 100, a rotor 101 arranged with a gap inside the stator 100, and a housing 102 for fixing the stator 100 and the rotor 101. ..

The rotor 101 is cylindrical and includes a shaft 111, a rotor core 112 fixed to the outer circumference of the shaft 111, and a permanent magnet 113 embedded in the rotor core 112. As shown in FIG. 2, the rotor 101 is rotatably held in the housing 102 by fitting the shaft 111 into the inner ring of the bearing 121 provided in the housing 102.

The rotor 101 generates magnetic flux by the permanent magnet 113. In FIG. 1, the permanent magnet 113 is arranged and embedded in the rotor core 112 in a V shape, but the present invention is not limited to this, and the permanent magnet 113 may be arranged in a linear shape or other shape. Further, the permanent magnet 113 may not be embedded in the rotor core 112, may be attached to the outer peripheral surface of the rotor core 112, and may be arranged so as to face the stator 100. The number of magnetic poles generated by the permanent magnet 113 is not limited to 6 poles as shown in FIG. 1, but may be the number corresponding to the number of teeth 12 of the stator 100.

The stator 100 is cylindrical and includes a stator core 1 and a coil 5 wound around the stator core 1. The stator core 1 has an annular core back 11 and a plurality of teeth 12 extending inward from the core back 11. Slots 13 are formed between adjacent teeth 12. The coil 5 is wound around the teeth 12 and arranged in the slot 13. The number of turns and the wire diameter of the coil 5 are determined according to the characteristics (rotation speed, torque, etc.) required for the motor 10, the supply voltage, or the cross-sectional area of the slot 13.

FIG. 3 is a plan view of the stator 100 of the motor 10 according to the first embodiment. Hereinafter, the direction along the central axis of the stator 100 is referred to as "axial direction", the direction along the outer circumference (circumference) of the stator 100 is referred to as "circumferential direction", and the radial direction of the stator 100 is referred to as "diameter direction". It is called. The stator core 1 is configured by connecting a plurality of divided cores 1a in an annular shape. The split core 1a is formed by laminating a plurality of thin electromagnetic steel sheets having a thickness of 0.25 mm, which are punched into a predetermined shape, by caulking or the like. The plurality of divided cores 1a are connected by a joint wrap method. Specifically, the plurality of divided cores 1a are rotatably connected by caulking 14 formed by forming unevenness on the electromagnetic steel plate. The stator core 1 may be an integral core.

Coil 5 is composed of U-phase, V-phase and W-phase three-phase windings. Further, in the example of FIG. 3, the coil 5 is wound by three U-phase, three V-phase, and three W-phase. The winding start wire of each phase is inserted into an insulating material such as a sleeve, used as a lead wire 51 composed of a first lead wire 511, a second lead wire 512, and a third lead wire 513, and is connected to a power supply. .. The first lead wire 511 is the winding start wire of the U-phase coil 5, the second lead wire 512 is the winding start wire of the V-phase coil 5, and the third lead wire 513 is the winding start wire of the W-phase coil 5. It is a line.

Further, the winding end wire of each phase is used as a neutral wire 52 composed of a first neutral wire 521, a second neutral wire 522, and a third neutral wire 523, and the tip of each wire is connected by a crimp terminal 70. By being connected, the neutral point 7 is formed. The first neutral wire 521 is the winding end wire of the U-phase coil 5, the second neutral wire 522 is the winding end wire of the V-phase coil 5, and the third neutral wire 523 is the winding end wire of the W-phase coil 5. It is the end line of the winding.

Further, the coil 5 is continuously wound around a plurality of teeth 12 for each phase. The coils 5 wound around the teeth 12 of the same phase are directly connected by a crossover wire 53 (FIG. 4), or are connected by a method that does not use a pressure welding component such as cold pressure welding. The crossover wire 53 is a winding end line of the coil 5 of each phase, and is a coil wire routed along the outer peripheral surface of the first insulator 2, the second insulator 3, or the third insulator 4.

A first insulator 2, a second insulator 3, and a third insulator 4 are provided between the stator core 1 and the coil 5. The first insulator 2, the second insulator 3, and the third insulator 4 are formed of an insulating resin. The first insulator 2 insulates the stator core 1 and the U-phase coil 5, the second insulator 3 insulates the stator core 1 and the V-phase coil 5, and the third insulator 4 is It insulates the stator core 1 and the W-phase coil 5.

The first insulator 2, the second insulator 3, and the third insulator 4 are each composed of a pair, and are arranged so as to cover the teeth 12 from both sides in the stacking direction of the stator core 1. FIG. 3 shows only one of the pair of first insulator 2, second insulator 3, and third insulator 4 arranged on the upper side. Further, a fixing component 6 described later is attached to the first insulator 2.

FIG. 4 is a perspective view of the first insulator 2 of the stator 100 according to the first embodiment. Specifically, FIG. 4 is a perspective view of the first insulator 2 arranged in U3 of the stator 100 shown in FIG. As shown in FIG. 4, the first insulator 2 has a winding portion 21 that covers an axial end surface and a part of a side surface of the teeth 12. The coil 5 is wound on the winding portion 21. Further, winding walls are provided at both ends of the winding portion 21 to prevent the coil 5 wound around the teeth 12 from being unwound. The winding wall located on the root side (diameter outside) of the teeth 12 is referred to as the first winding wall portion 22, and the winding wall located on the tip side (diameter inside) of the teeth 12 is referred to as the second winding wall portion 23.

On the back surface (radial outer surface) of the first winding wall portion 22, a first accommodating portion 24 for accommodating a crossover wire 53 connecting the in-phase coils 5 wound around each tooth 12 is provided. .. The first storage unit 24 has a groove for storing the crossover line 53 of each phase separately in the upper stage, the middle stage, and the lower stage.

On the upper end surface of the first winding wall portion 22, a second accommodating portion 25 for accommodating the neutral point 7 including the neutral wire 52 and the crimp terminal 70 is provided. The second storage portion 25 has a box shape with an open upper surface. A storage groove 251 penetrating in the circumferential direction is provided on the side wall of the second storage portion 25 facing the circumferential direction. A neutral wire 52 is arranged in the storage groove 251. A side groove 252 penetrating in the axial direction is provided on the outer surface of the side wall facing the second storage portion 25 in the radial direction. At the lower end of the side groove 252, a protrusion 253 projecting outward is provided.

The opening on the upper surface of the second storage portion 25 is closed by the fixing component 6. The fixing component 6 is made of the same material as the first insulator 2. The fixing component 6 is composed of a cross-shaped lid portion 61 in a plan view and two leg portions 62 extending downward from the lid portion 61 and facing each other in the radial direction. Further, claws 63 are provided at the lower ends of the two legs 62, respectively.

FIG. 5 is a diagram illustrating the fixing of the fixing component 6 of the stator 100 according to the first embodiment to the second storage portion 25. FIG. 5 is a schematic cross-sectional view in which the periphery of the fixed component 6 is cut along a plane parallel to the radial direction. A crimp terminal 70 is arranged inside the second storage portion 25. As shown in FIG. 5, the width of the storage groove 251 of the second storage portion 25 is narrower than the width of the crimp terminal 70. As a result, the crimp terminal 70 is housed in the second storage portion 25, so that the movement of the crimp terminal 70 in the circumferential direction and the radial direction is restricted.

Further, as shown in FIG. 5, in the fixing component 6, the leg portion 62 is inserted along the side groove 252 of the second storage portion 25, and the claw portion 63 of the fixing component 6 is a protrusion at the lower end of the side surface groove 252. It is fixed by being hooked on the bottom surface of 253. As a result, the axial movement of the crimp terminal 70 is also restricted, and the neutral point 7 can be fixed in the second accommodating portion 25. Further, at this time, the lid portion 61 of the fixed component 6 is fitted into the opening on the upper surface of the second accommodating portion 25, and the movement of the fixed component 6 in the circumferential direction and the radial direction is restricted. Further, the leg portion 62 and the claw portion 63 of the fixed component 6 regulate the movement of the fixed component 6 in the radial direction and the axial direction. That is, the fixed component 6 has a deterrent force against movement in all directions. For example, even when the driving target of the motor 10 generates vibration during operation, the fixed component 6 is disengaged by the vibration and the crimp terminal is used. It is possible to suppress the exposure of 70.

Further, since the protrusion 253 of the second storage portion 25 is arranged only in the lower portion of the second storage portion 25, the claw portion 63 and the second storage portion 25 interfere with each other until just before the insertion of the fixing component 6 is completed. There is nothing to do. As a result, the fixed part 6 can be easily inserted into the second storage portion 25, and the assembling property is improved.

Further, as shown in FIG. 3, an arbitrary number of lead wires 51 are stored in the second storage portion 25 of the first insulator 2 arranged in U1 of the stator 100, and are fixed by the fixing component 6. Further, only the neutral wire 52 is stored in the second storage portion 25 of the first insulator 2 arranged in U2 of the stator 100, and is fixed by the fixing component 6. As a result, the lead wire 51 and the neutral wire 52 can be fixed without using a pressure welding terminal.

FIG. 6 is a diagram illustrating the dimensions of the fixed component 6 of the stator 100 according to the first embodiment. FIG. 6 is a perspective view of FIG. 4 as viewed from different angles. The circumferential dimension A of the lid portion 61 of the fixed component 6 shown in FIG. 6 is the same as the circumferential internal dimension C of the second storage portion 25, and the radial dimension B of the lid portion 61 of the fixed component 6 is , The same as the radial inner dimension D of the second storage portion 25. Further, each dimension may have a relationship of A> C and B> D within a range satisfying the mechanical strength of the second storage portion 25. As a result, the lid portion 61 has a tightening allowance with respect to the second storage portion 25, and it is possible to further suppress the operation in the axial direction. As a result, the reliability of fixing the fixed component 6 is further improved.

FIG. 7 is a perspective view of the third insulator 4 of the stator 100 according to the first embodiment. As shown in FIG. 7, the third insulator 4 has a winding portion 41 that covers an axial end surface and a part of a side surface of the teeth 12, similarly to the first insulator 2. The coil 5 is wound on the winding portion 41. Further, winding walls are provided at both ends of the winding portion 41 to prevent the coil 5 wound around the teeth 12 from being unwound. The winding wall located on the root side (diameter outside) of the teeth 12 is referred to as the first winding wall portion 42, and the winding wall located on the tip side (diameter inside) of the teeth 12 is referred to as the second winding wall portion 43.

On the back surface (radial outer surface) of the first winding wall portion 42, a first accommodating portion 44 for accommodating a crossover wire 53 connecting the in-phase coils 5 wound around each tooth 12 is provided. .. The first storage unit 44 has a groove for storing the crossover line 53 of each phase separately in the upper stage, the middle stage, and the lower stage.

The upper surface cover 45 and the side surface cover 46 are provided side by side in the circumferential direction on the upper end surface of the first winding wall portion 42. The upper surface cover 45 is composed of a wall portion 451 extending upward from the radial inside of the upper end surface of the first winding wall portion 42, and a cover portion 452 extending radially outward from the upper end of the wall portion 451. The neutral wire 52 is arranged between the cover portion 452 of the upper surface cover 45 and the upper end surface of the first winding wall portion 42, and the upward movement is restricted.

The side cover 46 is configured to extend upward from the radial outside of the upper end surface of the first winding wall portion 42. The radial inward movement of the neutral wire 52 is regulated by the wall portion 451 of the top cover 45, and the radial inward movement is regulated by the side cover 46. As a result, the reliability of the wiring design against external forces such as vibration can be improved even when the neutral wire 52 has a long routing length.

The structure of the second insulator 3 is the same as that of the third insulator 4. Further, the lower first insulator 2, the second insulator 3, and the third insulator 4 do not need to be provided with the first storage portion, the second storage portion, the upper surface cover, the side cover, and the like. For example, the lower first insulator 2, the second insulator 3, and the third insulator 4 are composed of a winding portion and first and second winding wall portions.

As described above, in the stator 100 according to the present embodiment, since the coils 5 having the same phase are directly connected to each other by the crossover wire 53 formed by the coil wires, it is possible to reduce the number of connecting parts such as pressure welding terminals or jumper wires. Further, the first insulator 2 is provided with the second accommodating portion 25 in which the neutral point 7 and the lead wire 51 are housed, and the second accommodating portion 25 is covered with the fixing component 6 to form the neutral point 7 and the lead wire 51. It can be firmly fixed while preventing contact with peripheral parts. Further, by using the second storage portion 25 and the fixing component 6 that can be easily combined, an increase in assembly man-hours can be suppressed. Further, the reliability of the fixed structure can be improved by fitting the fixed component 6 and the second accommodating portion 25 so as to fit in all directions.

The above is the description of the embodiment, but the above embodiment can be variously modified and combined. For example, in the above embodiment, the first insulator 2 is provided with the second storage portion 25, but the present invention is not limited to this. The second accommodating portion 25 and the fixing component 6 may be provided in at least one of the first insulator 2, the second insulator 3, and the third insulator 4 according to the required specifications of the stator 100. In this way, since the fixing position of the connecting portion of the coil 5 can be changed, it is possible to provide a fixing structure having excellent productivity.

1 stator core, 1a split core, 2 first insulator, 3 second insulator, 4 third insulator, 5 coil, 6 fixed parts, 7 neutral point, 10 electric motor, 11 core back, 12 teeth, 13 slots, 14 crimps, 21 winding part, 22 first winding wall part, 23 second winding wall part, 24 first storage part, 25 second storage part, 41 winding part, 42 first winding wall part, 43 second winding wall part, 44 first storage, 45 top cover, 46 side cover, 51 lead wire, 52 neutral wire, 53 cross wire, 61 lid, 62 legs, 63 claws, 70 crimp terminals, 100 stator, 101 rotor, 102 Housing, 111 shaft, 112 rotor core, 113 permanent magnet, 121 bearing, 251 storage groove, 252 side groove, 253 protrusion, 511 first lead wire, 512 second lead wire, 513 third lead wire, 521 first neutral Line, 522 second neutral line, 523 third neutral line.

Claims

A stator core with multiple teeth and
A coil wound continuously for each phase on a plurality of the teeth,
An insulator that insulates between the coil and the plurality of teeth,
A crimp terminal that connects the coils for each phase to form a neutral point,
Lead wires for connecting the coil for each phase and the power supply,
With a fixing component attached to the insulator,
The insulator has a storage portion in which the crimp terminal or the lead wire is housed.
The fixing component is a stator of a motor that is attached to the storage portion and fixes the crimp terminal or the lead wire.
The storage unit
It has a box shape with an open top surface
A storage groove penetrating in the circumferential direction is provided on the side wall facing the circumferential direction.
A side groove extending in the axial direction is provided on the outer surface of the side wall facing in the radial direction.
The stator of the motor according to claim 1, wherein a protrusion is provided at the lower end of the side groove.
The fixed parts
With the lid
With the legs extending along the side groove,
The stator of a motor according to claim 2, further comprising a claw portion that fits with the protrusion portion.
The circumferential dimension of the lid portion of the fixed part is the same as the circumferential internal dimension of the storage portion, and the radial dimension of the lid portion of the fixed part is the said of the storage portion. The stator of the motor according to claim 3, which has the same internal dimensions in the radial direction.
The circumferential dimension of the lid portion of the fixed part is larger than the circumferential internal dimension of the storage portion, and the radial dimension of the lid portion of the fixed part is the diameter of the storage portion. The stator of the motor according to claim 3, which is larger than the inner dimension in the direction.
The insulator comprises a first insulator, a second insulator, and a third insulator corresponding to the coil for each phase, and the housing portion is at least the first insulator, the second insulator, and the third insulator. The stator of the motor according to any one of claims 1 to 5, which is provided in any one of them.
The stator according to any one of claims 1 to 6,
An electric motor including a rotor arranged with a gap inside the stator.