CN110637405B

CN110637405B - Stator of rotating electric machine

Info

Publication number: CN110637405B
Application number: CN201780090872.3A
Authority: CN
Inventors: 矶野祐辅
Original assignee: Mitsubishi Electric Corp
Current assignee: Mitsubishi Electric Corp
Priority date: 2017-05-23
Filing date: 2017-05-23
Publication date: 2021-04-27
Anticipated expiration: 2037-05-23
Also published as: WO2018216104A1; CN110637405A; JP6712089B2; JPWO2018216104A1

Abstract

A stator of a rotating electric machine includes: a stator core formed by laminating steel plates and having a plurality of slots; a groove insulator disposed in each of the plurality of grooves; and a winding disposed in each of the plurality of slots with a slot insulator interposed therebetween, the slot insulator being formed by superimposing a pair of insulating papers having a fiber direction, the insulating paper on one side of the pair of insulating papers in contact with the stator core being disposed such that the fiber direction is parallel to the direction of the laminated steel plates, and the insulating paper on one side of the pair of insulating papers in contact with the winding being disposed such that the fiber direction is perpendicular to the longitudinal direction of the winding.

Description

Stator of rotating electric machine

Technical Field

The present invention relates to a rotating electrical machine, and more particularly, to an insulation structure of a winding disposed in a stator of a distributed winding motor.

Background

Conventionally, in a stator used for a three-phase rotating electrical machine such as a motor, a generator, or a motor generator, a distributed winding method is used in which three-phase windings of U-phase, V-phase, and W-phase are arranged so as to straddle a plurality of slots formed in a stator core. In the manufacturing process of such a stator core, first, slot insulators (insulating paper) are disposed in the slots, and the coils of the first layer are inserted. Then, after disposing a spacer for interlayer insulation and inserting the coil of the second layer, each coil and each insulating paper are fixed by a wedge.

In the distributed winding motor, since the windings of the respective phases are wound so as to straddle a plurality of slots of the stator, it is difficult to arrange the windings with an automatic machine. Therefore, in the manufacture of the distributed winding motor, the step of disposing the winding and the insulating paper in each slot is performed by manual work. Therefore, when the winding is inserted into the slot in which the slot insulator is disposed, the slot insulator may be broken by friction between the slot insulator and the winding, or the position of the slot insulator may be displaced in the axial direction. Accordingly, a technique is disclosed in which: in consideration of the offset amount of the slot insulator due to the coil insertion work, the length of the slot insulator in the axial direction of the stator core is increased to increase the amount of protrusion from the end of the stator core (see, for example, patent document 1).

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 2013-243841

Patent document 2: japanese patent laid-open No. 2008-253063

Disclosure of Invention

Problems to be solved by the invention

However, in the technique described in patent document 1, damage of the slot insulator due to friction between the slot insulator and the coil is not considered. Further, since the slot insulator protrudes from the end of the stator core by a large amount, the material cost of the slot insulator increases.

The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a stator for a rotating electric machine, which can prevent the position of a slot insulator from being displaced when a winding is inserted into a slot while suppressing the damage of the slot insulator due to the friction between the slot insulator and a coil.

Means for solving the problems

The stator of a rotating electric machine of the present invention includes: a stator core formed by laminating steel plates and having a plurality of slots; a groove insulator disposed in each of the plurality of grooves; and a winding disposed in each of the plurality of slots with a slot insulator interposed therebetween, wherein the slot insulator is formed by overlapping a pair of insulating papers having a fiber direction, the insulating paper on the side of the pair of insulating papers in contact with the stator core is disposed such that the fiber direction is parallel to the direction of the laminated steel plates, and the insulating paper on the side of the pair of insulating papers in contact with the winding is disposed such that the fiber direction is perpendicular to the longitudinal direction of the winding.

Effects of the invention

According to the stator of the rotating electric machine of the present invention, the direction of the fiber of the slot insulator is determined according to the position where the slot insulator is disposed, so that damage of the slot insulator can be suppressed, and the insulation between the winding and the stator core can be improved.

Drawings

Fig. 1 is a schematic view showing a rotary electric machine provided with a stator according to embodiment 1 of the present invention.

Fig. 2 is a view showing a stator core constituting the stator of fig. 1.

Fig. 3 is a partial perspective view illustrating a process of forming the stator core of fig. 2.

Fig. 4 is a partial perspective view illustrating a process of arranging a winding in the stator core of fig. 2.

Fig. 5 is a partial perspective view illustrating a process of arranging a winding in the stator core of fig. 2.

Fig. 6 is a schematic view of the stator core of fig. 5 viewed from the inner peripheral side of the stator core.

Fig. 7 is a schematic view of the stator core of fig. 6 as viewed from the axial direction.

Detailed Description

Preferred embodiments of a stator of a rotating electric machine according to the present invention will be described below with reference to the accompanying drawings.

Embodiment mode 1

Fig. 1 is a sectional view showing a distributed winding motor 100 in which a stator 20 of a rotating electric machine according to embodiment 1 of the present invention is disposed. The distributed winding motor 100 has: a rotor 10 rotatably disposed; a stator 20 provided in an annular shape so as to surround the outer periphery of the rotor 10; and a housing member 30 that houses the rotor 10 and the stator 20 therein.

The rotor 10 has: a shaft member 11 which is a rod-shaped member extending in the direction of the rotation axis of the rotor 10; a rotor core 12 disposed on an outer peripheral side of the shaft member 11; and an end plate 13 disposed in contact with the rotor core 12.

The housing member 30 is a cylindrical case that protects the rotor 10 and the stator 20. The housing member 30 holds the stator 20 on the inner peripheral surface of the housing member 30. The housing member 30 holds the shaft member 11 of the rotor 10 by a bearing 31 provided at an inner diameter end of the housing member 30.

Fig. 2 is a view of stator 20 according to embodiment 1 as viewed from the axial direction. As shown in fig. 2, the stator 20 includes: an annular stator core 21; a winding 22 inserted into the slot 21C of the stator core 21; and a slot insulator (slot cell)23 disposed in the slot 21C.

The stator core 21 is formed by laminating a plurality of steel plates. A plurality of teeth 21A protruding in the inner diameter direction are formed on the stator core 21. A groove 21C is formed as a space between adjacent teeth 21A.

Next, the structure of the stator 20 according to embodiment 1 will be described in detail with reference to fig. 3. Fig. 3 is a perspective view of stator 20 according to embodiment 1 as viewed from a direction a shown in fig. 2. Fig. 3 shows the structure of the stator 20 of embodiment 1 by the process of forming the stator 20. In fig. 3, the diameter of the winding 22 is shown exaggerated.

As shown in a portion B of fig. 3, the stator core 21 is formed by laminating a plurality of steel plates. The stator core 21 is formed with a plurality of tooth portions 21A, and a slot 21C is formed between each adjacent tooth portion 21A. In addition, only two tooth portions 21A in the B portion show a laminated state of the steel plates forming the stator core 21. The arrows of the teeth 21A indicate the stacking direction a of the steel plates.

A slot insulator 23 is disposed in each slot 21C. As shown in the outside of the stator core 21 in fig. 3, the slot insulator 23 is formed by bonding a pair of insulating paper 23D and insulating paper 23U with double-sided tape or the like. Further, the slot insulators 23 are bent in accordance with the shape of the slots 21C, and are inserted into the respective slots 21C as indicated by arrows C in fig. 3. Note that, the slot insulator 23 shown outside the stator core 21 in fig. 3 is shown in a state in which the insulating paper 23D and the insulating paper 23U are only partially overlapped, but when the slot insulator 23 is inserted into the slot 21C, the insulating paper 23D and the insulating paper 23U are inserted in a state in which they are overlapped, and are arranged in the slot 21C as shown in D in fig. 3.

Here, since paper is manufactured while pulp is made to flow in a fixed direction, fibers are aligned in the traveling direction, and a "filament direction of paper" is formed. The paper is easy to break and bend in a direction parallel to the filaments, but is difficult to break and bend in a direction perpendicular to the filaments. The insulating paper also has this "paper orientation". Hereinafter, in the present specification, the direction of "paper filament direction" of the insulating paper is referred to as the fiber direction.

When the slot insulator 23 is inserted into the slot 21C, the surface of the insulating paper 23D on the outer side of the slot insulator 23 and the inner wall of the slot 21C rub against each other. At this time, if the direction of each end face of the laminated steel plates forming the stator core 21 is parallel to the direction of the fibers of the insulating paper 23D, the insulating paper 23D is easily broken. Therefore, in the stator 20 according to embodiment 1, as shown in the outside of the stator core 21 in fig. 3, the insulating paper 23D is disposed such that the fiber direction h of the insulating paper 23D of the slot insulator 23 is perpendicular to the end face of the steel plate, that is, parallel to the stacking direction a of the steel plates. Thus, the groove insulator 23 is prevented from rubbing against the inner wall of the groove 21C, and the groove insulator 23 is prevented from being damaged.

As shown in the slot 21C of fig. 3D, the winding 22 is inserted into the slot 21C in which the slot insulator 23 is arranged from the opening of the slot 21C formed on the inner peripheral side of the tooth portion 21A. In the case of the distributed winding motor 100, as shown in the slot 21C of H in fig. 3, the winding 22 disposed in each slot 21C is composed of the first-layer coil 221 and the second-layer coil 222. In fig. 3, the winding 22, the first layer coil 221, and the second layer coil 222 are shown in a cut-off state. The procedure of disposing the first layer coil 221 and the second layer coil 222 in the slot 21C will be described later.

The slot 21C of E of fig. 3 shows a state where the first layer coil 221 is arranged. When the first-layer coil 221 is disposed in the slot 21C, the winding 22 constituting the first-layer coil 221 contacts and rubs against the insulating paper 23U of the slot insulator 23. At this time, if the direction of the fibers of the insulating paper 23U is parallel to the longitudinal direction b of the winding 22 constituting the first layer coil 221, the insulating paper 23U is easily broken. Therefore, in the stator 20 of embodiment 1, as shown in the outside of the stator core 21 of fig. 3, the insulating paper 23U is disposed so that the direction k of the fibers of the insulating paper 23U constituting the slot insulator 23 is perpendicular to the longitudinal direction b of the winding 22 constituting the first-layer coil 221. Thus, the slot insulator 23 is prevented from rubbing against the winding 22 constituting the first-layer coil 221, and the slot insulator 23 is prevented from being damaged.

The spacer 25 is disposed in the slot 21C in which the first-layer coil 221 is disposed. The separator 25 insulates the first layer coil 221 from the second layer coil 222 in the slot 21C. As shown outside the stator core 21 in fig. 3, the separator 25 is formed by stacking a pair of interlayer insulating

papers

25D and 25U and bonding them with a double-sided tape or the like. The spacers 25 are inserted into the slots 21C as indicated by the arrow F in fig. 3, and the spacers 25 are arranged above the first-layer coil 221 as indicated by the slots 21C of G.

The separator 25 shown outside the stator core 21 in fig. 3 is shown in a state where the interlayer insulating paper 25D and the interlayer insulating paper 25U are only partially overlapped, but when the separator 25 is inserted into the slot 21C, the interlayer insulating paper 25D and the interlayer insulating paper 25U are inserted in a state where they are overlapped.

When the separator 25 is inserted into the slot 21C in which the first-layer coil 221 is arranged, the interlayer insulating paper 25D constituting the separator 25 comes into contact with the first-layer coil 221 and generates friction. At this time, if the direction of the fibers of the interlayer insulating paper 25D is parallel to the longitudinal direction b of the winding 22 constituting the first-layer coil 221, the interlayer insulating paper 25D is easily broken. Therefore, in the stator 20 according to embodiment 1, as shown in the outside of the stator core 21 in fig. 3, the interlayer insulating paper 25D is disposed such that the direction n of the fibers of the interlayer insulating paper 25D constituting the separator 25 is perpendicular to the longitudinal direction b of the winding 22 constituting the first-layer coil 221. Thus, the separator 25 is prevented from rubbing against the winding 22 constituting the first-layer coil 221, and the separator 25 is prevented from being damaged.

Further, cut portions 50 are formed at both end portions of the interlayer insulating paper 25U constituting the separator 25. The two cut portions 50 are formed such that the slot insulator 23 is accommodated between the two cut portions 50. After the partition plate 25 is inserted into the groove 21C, the cut-out portion 50 is hooked on the end portion of the groove insulator 23. Thereby, the tank insulator 23 is fixed to the separator 25.

As shown in H of fig. 3, the second layer coil 222 is further disposed in the groove 21C in which the spacer 25 is disposed. When the second layer coil 222 is inserted above the separator 25, the interlayer insulating paper 25U of the separator 25 comes into contact with the winding 22 constituting the second layer coil 222 and generates friction. At this time, if the direction of the fibers of the interlayer insulating paper 25U is parallel to the longitudinal direction b of the winding 22 constituting the second layer coil 222, the interlayer insulating paper 25U is easily broken. Therefore, in the stator 20 of embodiment 1, as shown in the outside of the stator core 21 of fig. 3, the interlayer insulating paper 25U is disposed such that the direction m of the fibers of the interlayer insulating paper 25U constituting the separator 25 is perpendicular to the longitudinal direction b of the winding 22 constituting the second-layer coil 222. Thus, the separator 25 is prevented from rubbing against the winding 22 constituting the second-layer coil 222, and the separator 25 is prevented from being damaged. That is, the direction of the fibers of the interlayer insulating paper 25D and the interlayer insulating paper 25U constituting the separator 25 is the same direction. The stator 20 of embodiment 1 is thereby formed.

Next, a procedure of disposing the winding 22 in the distributed winding motor 100 will be described with reference to fig. 4 and 5. Fig. 4 and 5 are views of the stator core 21 as viewed from the direction a of fig. 2, similarly to fig. 3. In fig. 4 and 5, the diameter of the winding 22 disposed on the stator core 21 is partially exaggerated.

When the winding 22 is disposed in the stator core 21 of the distributed winding motor 100, first, a plurality of formed coils 22A as shown in fig. 4 are formed, and the formed coils 22A are formed by winding the winding 22A plurality of times. Then, the first-layer coil 221 is formed by inserting one winding 22A of one molded coil 22A into the slot 21C of the J. At this time, the windings 22 in the bundle of windings 22a are separated several by several and inserted into the slots 21C. After all the windings 22A of one of the molded coils 22A are inserted into the slots 21C of J, the windings 22A of the other molded coil 22A are inserted into the slots 21C of K adjacent thereto. After all the windings 22A of the other formed coil 22A are inserted into the slots 21C of K, one winding 22A of the other formed coil 22A is inserted into the slot 21C of the adjacent L. In this way, one winding 22A of the plurality of formed coils 22A is inserted into all the slots 21C of the stator core 21, and the first-layer coil 221 is disposed in all the slots 21C.

Next, as shown in fig. 5, the spacers 25 are disposed above the first-layer coils 221 disposed in the respective slots 21C. Then, the other winding 22b of the molded coil 22A is inserted into the second L-shaped slot 21C next to the J-shaped slot 21C in which the one winding 22A is arranged, thereby forming the second layer coil 222. Similarly, the other winding 22b of all the other formed coils 22A is inserted into the slot 21C, and the arrangement of the winding 22 in the stator core 21 is completed.

Fig. 6 is a view of the molded coil 22A after being disposed in the slot 21C, as viewed from the direction M in fig. 5. Fig. 7 is a view of fig. 6 as viewed from the direction N. In fig. 6 and 7, only the first-layer coil 221 and the second-layer coil 222 formed of one molded coil 22A are shown, and the other first-layer coil 221 and second-layer coil 222 are not shown.

As shown in fig. 6 and 7, a wedge 26 for preventing the second layer coil 222 from coming out is inserted into an opening on the outer peripheral side of the slot 21C in which the first layer coil 221 and the second layer coil 222 are arranged. In addition, the inter-phase insulating paper 60 for insulating the coil end 22E of the first-layer coil 221 and the second-layer coil 222 from the coil end 22E of a different phase is disposed at the coil end 22E exposed to the outside of the slot 21C. Thereby completing the stator 20.

In this way, in the stator 20 of the rotating electric machine according to embodiment 1, the slot insulator 23 composed of the insulating paper 23U and the insulating paper 23D is disposed in each of the plurality of slots 21C formed in the stator core 21. The insulating paper 23D is disposed so that the direction of the fibers of the insulating paper 23D in contact with the stator core 21 is parallel to the stacking direction of the steel plates forming the stator core 21. Further, the insulating paper 23U is disposed so that the direction of the fibers of the insulating paper 23U in contact with the winding 22 is perpendicular to the longitudinal direction of the winding 22.

This can suppress one of the insulating sheets 23D constituting the slot insulator 23 from being broken due to friction with the stator core 21, and can suppress the other of the insulating sheets 23U constituting the slot insulator 23 from being broken due to friction with the winding 22. Therefore, the durability of the slot insulator 23 can be improved, and the insulation between the winding 22 and the stator core 21 can be stably maintained.

Further, according to the stator 20 of the rotating electric machine according to embodiment 1, the cut-out portion 50 is formed in the separator 25, and the slot insulator 23 is fixed to the separator 25. This can suppress the slot insulator 23 from being displaced when the winding 22 is inserted into the slot 21C. Therefore, it is not necessary to make the axial width of the slot insulator 23 a long dimension in consideration of the positional deviation, and the material cost of the slot insulator 23 can be reduced.

In the stator 20 according to embodiment 1, the notches 50 of the interlayer insulating paper 25U constituting the separator 25 are formed at both ends of the interlayer insulating paper 25U, but the positions where the notches 50 are formed are not limited to this. For example, the cut-outs 50 may be formed not at both ends of the interlayer insulating paper 25U but only at one end capable of preventing the movement of the slot insulator 23 when the winding 22 is inserted. Further, the cut 50 may be formed in the interlayer insulating paper 25D, or may be formed in both the interlayer insulating paper 25D and the interlayer insulating paper 25U.

In addition, in the stator 20 according to embodiment 1, the windings 22 arranged in the slots 21C are formed in two layers, i.e., the first-layer coil 221 and the second-layer coil 222, but the configuration of the windings 22 is not limited to this. For example, the layer of the winding 22 disposed in the slot 21C may be three or more layers.

Description of the reference symbols

10: a rotor; 11: a shaft member; 12: a rotor core; 13: an end plate; 20: a stator; 21: a stator core; 21A: a tooth portion; 21C: a groove; 22. 22a, 22 b: a winding; 22A: forming a coil; 22E: a coil end; 221: a first layer of coils; 222: a second layer of coils; 23: a slot insulator; 23D, 23U: insulating paper; 25: a partition plate; 25D, 25U: interlayer insulating paper; 26: a wedge; 50: a cut-in portion; 60: interphase insulating paper; 100: a distributed winding motor.

Claims

1. A stator of a rotating electric machine, comprising:

a stator core formed by laminating steel plates and having a plurality of slots;

a groove insulator disposed in each of the plurality of grooves; and

a winding disposed in each of the plurality of slots with the slot insulator interposed therebetween,

the slot insulator is formed by overlapping a pair of slot insulating papers,

on the pair of slot insulating papers, the fibers passing through the slot insulating papers form a filament direction along a fixed direction respectively,

the slot insulating paper on the side of the pair of slot insulating papers that is in contact with the stator core is disposed so that the direction along the filament direction is parallel to the direction in which the steel plates are stacked,

the slot insulating paper on the side of the pair of slot insulating papers that is in contact with the winding is disposed such that the direction of the fibers is perpendicular to the longitudinal direction of the winding.

2. The stator of the rotating electric machine according to claim 1,

the winding includes: a first layer coil disposed on the bottom surface side of the slot; and a second layer coil laminated on the first layer coil,

a separator is disposed between the first layer coil and the second layer coil,

the separator is formed by overlapping a pair of interlayer insulating papers,

a pair of interlayer insulating papers, each having a fiber direction along a fixed direction formed by a fiber of the interlayer insulating paper,

the pair of interlayer insulating papers are arranged such that the direction along the filament direction is perpendicular to the longitudinal direction of the winding.

3. The stator of the rotating electric machine according to claim 2,

at least one of the pair of interlayer insulating sheets has a cut portion that engages with an end of the slot insulator.