CN219107164U

CN219107164U - Motor stator

Info

Publication number: CN219107164U
Application number: CN202223318840.1U
Authority: CN
Inventors: 郑广会; 张铃; 郑帅辰; 王文; 王东东
Original assignee: Tianweilan Electric Drive Technology Jiangsu Co ltd
Current assignee: Tianweilan Electric Drive Technology Jiangsu Co ltd
Priority date: 2022-12-09
Filing date: 2022-12-09
Publication date: 2023-05-30
Anticipated expiration: 2032-12-09

Abstract

The utility model provides a motor stator, which comprises a stator core, windings and interphase insulating materials, wherein the windings comprise U-phase wire packages, V-phase wire packages and W-phase wire packages which are sequentially formed from outside to inside in the radial direction of the stator core, the interphase insulating materials comprise first interphase insulating materials and second interphase insulating materials, the first interphase insulating materials are at least wound on the area, close to the stator core, of each U-phase wire package in the axial direction of the stator core, and the second interphase insulating materials are arranged between the V-phase wire packages and the W-phase wire packages in a non-winding mode. The motor stator provided by the utility model has good interphase insulation performance, and the interphase insulation paper is reasonable in arrangement and easy to manufacture.

Description

Motor stator

Technical Field

The utility model relates to the field of motors, in particular to a motor stator.

Background

Taking a motor stator of a new energy automobile as an example, three-phase windings (U-phase windings, V-phase windings and W-phase windings) are wound in the stator phase by phase. For example, in the case of using enamel wire as the winding, a portion of each phase winding protruding from the stator slot forms a coil. In order to ensure the insulation performance of the windings, insulation sheets (also called phase-to-phase insulation paper) are arranged between adjacent windings of different phases.

Typically, the winding and phase insulation paper are arranged in the following order: the U-phase winding is embedded, interphase insulating paper between the U phase and the V phase is arranged, the U phase package expands, the V phase winding is embedded, interphase insulating paper between the V phase and the W phase is arranged, and the V phase package expands and the W phase winding is embedded. After this, it is also often necessary to tie together the three-phase windings at each axial end of the stator using a tie.

To increase power density, each wire package includes a number of closely spaced enameled wires, and adjacent phase wire packages are also closely spaced. This makes the setting operation of the phase insulation paper very difficult.

In addition, in the above steps, the wire package expansion, winding embedding, and binding in the subsequent step may affect the phase insulation paper arranged in the previous step, for example, shift or even drop the phase insulation paper arranged in the previous step.

Disclosure of Invention

The utility model aims to overcome or at least alleviate the defects in the prior art and provide a motor stator which is simple to manufacture, low in cost and good in interphase insulation effect.

The utility model provides a motor stator, which comprises a stator core, a winding and an interphase insulating material, wherein the winding comprises a U-phase winding, a V-phase winding and a W-phase winding which are sequentially arranged from outside to inside in the radial direction of the stator core, the part of the U-phase winding protruding out of the stator core forms a U-phase coil, the part of the V-phase winding protruding out of the stator core forms a V-phase coil, the part of the W-phase winding protruding out of the stator core forms a W-phase coil, wherein,

the interphase insulating material includes a first interphase insulating material and a second interphase insulating material,

the first interphase insulating material is wound around at least a region of each of the U-phase wire packages that is adjacent to the stator core in the axial direction of the stator core,

the second phase-to-phase insulating material is disposed between the V-phase coil and the W-phase coil in an unwound manner.

In at least one embodiment, the first interphase insulating material completely wraps each of the U-phase wire packages.

In at least one embodiment, the first phase-to-phase insulating material is wound around only two spaced apart regions of each of the U-phase packages that are adjacent to the stator core in the axial direction of the stator core,

in the circumferential direction of the stator core, a central region of the U-phase coil is not wound with the first interphase insulating material.

In at least one embodiment, the first phase-to-phase insulation material is in a strip form and is wound around the U-phase coil by a spiral winding, the first phase-to-phase insulation material between each two adjacent threads having overlapping portions.

In at least one embodiment, the width of the first interphase insulating material is 2 times the pitch of the helical winding.

In at least one embodiment, the first interphase insulating material does not completely cover the U-phase coil in an area of the U-phase coil located radially outward of the stator core.

In at least one embodiment, the surface of the first interphase insulating material facing the U-phase coil has tackiness.

In at least one embodiment, the second inter-phase insulating material has a plurality of sheets, each of the sheets being disposed between an adjacent one of the V-phase packages and one of the W-phase packages.

In at least one embodiment, the second phase-to-phase insulating material includes a body portion that is arcuate with an opening disposed between two root portions of two ends of one of the V-phase bags.

In at least one embodiment, the second interlayer insulating material further includes two lug portions, each of the lug portions being located at a region of one end portion of the main body portion near the opening, the lug portions being adhered to the root portion.

The motor stator provided by the utility model has good interphase insulation performance, and the interphase insulation paper is reasonable in arrangement and easy to manufacture, and can completely isolate the interphase of the winding.

Drawings

Fig. 1 is a schematic view of a stator according to a first embodiment of the present application, viewed in an axial direction.

Fig. 2 is a schematic view of one U-phase coil (other windings are omitted for convenience of illustration) of the stator core according to the first embodiment of the present application in a state where the first interphase insulating material is wound.

Fig. 3 is a schematic view of a first interphase insulating material according to a first embodiment of the present application during winding (thick arrow in the drawing shows winding direction).

Fig. 4 shows a schematic shape of the second phase-to-phase insulating material and V-phase coil during assembly according to the first embodiment of the present application.

Fig. 5 shows a schematic shape of a second phase-to-phase insulating material according to a first embodiment of the present application.

Fig. 6 shows a schematic view of a second phase-to-phase insulating material and V-phase coil during assembly according to a first embodiment of the present application.

Fig. 7 is a schematic illustration of a first interphase insulating material wrapped in a U-phase coil according to a second embodiment of the present application.

Reference numerals illustrate:

10 stator core; 20 windings; 20a root;

21U phase wire package; a 22V phase pack; a 23W phase coil; 210 a middle region;

30 interphase insulating material; 31 a first interphase insulating material; 32 a second inter-phase insulating material;

321 a main body portion; 322 tab portions; 320 openings;

c, circumferential direction; r is radial; aaxial direction; s pitch; a width D; h maximum height of opening.

Detailed Description

Exemplary embodiments of the present utility model are described below with reference to the accompanying drawings. It should be understood that these specific illustrations are for the purpose of illustrating how one skilled in the art may practice the utility model, and are not intended to be exhaustive of all of the possible ways of practicing the utility model, nor to limit the scope of the utility model.

(first embodiment)

Referring to fig. 1 to 6, a motor stator according to a first embodiment of the present application is described.

Unless otherwise specified, referring to fig. 2, a denotes an axial direction of the motor stator, R denotes a radial direction of the motor stator, and C denotes a circumferential direction of the motor stator.

Referring to fig. 1, the motor stator of the present embodiment includes a stator core 10, windings 20 wound around the stator core 10, and an interphase insulating material 30. From the radial outside to the radial inside, the three-phase windings 20 are sequentially U-phase windings, V-phase windings, and W-phase windings. The windings 20 are partially embedded in the slots of the stator core 10, and partially protrude from the ends of the stator core 10 to form a U-shaped coil. Thus, in fig. 1, a plurality of coils, U-phase coil 21, V-phase coil 22 and W-phase coil 23, respectively, each of which is formed at one end of the stator can be seen.

The purpose of interphase insulating material 30 is to enhance the insulation between adjacent, out-of-phase packages.

The interphase insulating material 30 used in the present embodiment includes two types, namely, a first interphase insulating material 31 and a second interphase insulating material 32. The first interphase insulating material 31 serves to form enhanced insulation between the U-phase coil 21 and the V-phase coil 22, and the second interphase insulating material 32 serves to form enhanced insulation between the V-phase coil 22 and the W-phase coil 23.

Referring to fig. 2 and 3 together, the expanded shape of first phase to phase insulating material 31 is in the form of a strip that is wound around the surface of U-phase coil 21 in a spiral winding.

The winding is performed in such a way that the first interphase insulating material 31 almost completely covers the surface of the U-phase coil 21. In particular, the wrapping area of the first interphase insulating material 31 around the U-phase wire wrap 21 may extend to the root portion 20a of the two ends of the U-phase wire wrap 21 that meets the stator slot. And the winding form can make the wrapping of the U-phase wire package 21 at the root portion 20a very tight, and is not easy to cause the first interphase insulating material 31 to fall off or shift due to, for example, flaring the U-phase wire package 21, or inserting a V-phase winding, or binding the wire package in the subsequent process.

Optionally, an adhesive is provided on the side of first interphase insulating material 31 facing U-phase coil 21 so that first interphase insulating material 31 can be more firmly attached to U-phase coil 21. Alternatively, the first interphase insulating material 31 is, for example, a glass cloth tape. The glass cloth tape has a certain permeability, so that when the stator is subjected to a subsequent paint dipping (paint dripping can be used, and the following description is only described as paint dipping for simplicity), the insulating paint can permeate into the glass cloth tape to contact the enameled wire.

Optionally, the first interphase insulating material 31 between every two adjacent threads has overlapping portions. Preferably, the spiral winding of the first interphase insulating material 31 is such that: the width D of the first phase insulating material 31 is approximately equal to 2 times the pitch S. Each region of the surface of U-phase coil 21 can be covered by at least two layers of first interphase insulating material 31. The multilayer package naturally formed in the winding process enables the phase-to-phase insulation performance to be better.

It will be appreciated that the outer side (outer peripheral portion) of the U-phase coil 21 in the radial direction R of the stator core 10 is not actually provided with the phase-to-phase insulating material, and therefore, the first phase-to-phase insulating material 31 may not completely cover the U-phase coil 21 in this region, for example, leaving some gaps for facilitating the subsequent paint-dipping insulating operation.

Since the U-phase winding located at the radially outermost side is first embedded in the stator core 10, neither the V-phase winding nor the W-phase winding is embedded in the stator core 10 when the first interphase insulating material 31 is provided. This facilitates the operation of winding U-phase coil 21 around first phase-to-phase insulating material 31.

After that, if the insulation material is still provided between the V-phase coil 22 and the W-phase coil 23 by winding, it is difficult to operate both the winding of the V-phase coil 22 and the winding of the W-phase coil because the windings embedded in the stator core 10 interfere with the windings in the vicinity thereof, so that there is little space for the subsequent winding operation.

Therefore, in the present embodiment, the second phase-to-phase insulating material 32 provided between the V-phase coil 22 and the W-phase coil 23 has a substantially sheet shape. A second phase insulating material 32 is disposed between V-phase coil 22 and W-phase coil 23 in an unwound manner.

Referring also to fig. 4-6, in this embodiment, second phase-to-phase insulating material 32 has a shape generally similar to V-phase coil 22.

Specifically, the second inter-phase insulating material 32 includes a main body portion 321 and two lug portions 322.

The body 321 is arcuate, and the recess thereof forms an opening 320. The outer contour of the body portion 321 is similar to the outer contour of the V-phase pack 22, and preferably the outer contour of the body portion 321 is slightly larger than the V-phase pack 22 so that the inner side of the V-phase pack 22 (see also fig. 1) facing the W-phase pack can be covered by the body portion 321.

The arrangement of the opening 320 enables the main body 321 to adapt to the shape of the V-phase wire package 22 and form better fit with the V-phase wire package 22; on the other hand, in order to avoid the interference of the subsequent binding operation to the setting position of the second inter-phase insulating material 32, the second inter-phase insulating material 32 is not easily shifted by pulling the second inter-phase insulating material 32 when the binding rope passes through the coil.

Alternatively, the maximum opening height H of the opening 320 is at least 10mm in the axial direction a of the stator core 10.

The lug portion 322 is connected to an end portion of the body portion 321 in a region near the opening 320. Tab portion 322 is adapted to be folded back and adhered to root portion 20a of V-phase coil 22. This is because, if the second phase-to-phase insulating material 32 is displaced by the influence of the subsequent process, the region where the displacement occurs first is the region near the root 20a of the V-phase coil 22, and the present embodiment performs reinforcement fixation in this region, so that the displacement of the second phase-to-phase insulating material 32 can be effectively avoided.

The positioning of tab portion 322 also has the advantage of facilitating its folding. The tab portion 322 is folded through the opening 320 instead of selecting to be folded through the outside of the V-phase coil 22 because the opening 320 has an effective space for the folding operation of the tab portion 322 without embedding the W-phase winding in the stator core 10; the outside of V-wire package 22 is not easy to handle because it is adjacent to other wires, and thus lug portion 322 of the present embodiment may not extend and fold over the outside of V-wire package 22.

Alternatively, in the circumferential direction C, the length of the lug portion 322 does not exceed the width of the root 20a of the V-wire wrap 22. That is, after the lug portion 12 is folded back, it only surrounds the root portion 20a of the V-phase coil 22, and does not extend to other areas, and interference with other components is less likely to occur.

Optionally, the face of the lug portion 322 facing the V-phase coil 22 is provided with an adhesive. Optionally, the side of the entire piece of second phase-to-phase insulating material 32 facing the V-phase coil 22 is provided with an adhesive. Optionally, the entire piece of second inter-phase insulating material 32 is a glass cloth tape.

(second embodiment)

A second embodiment of the present application is described with reference to fig. 7. The second embodiment is a modification of the first embodiment, the same reference numerals are given to the same or similar components as those in the first embodiment in terms of structure or function, and detailed description of these components is omitted.

The main difference between this embodiment and the first embodiment is the manner in which the insulating material is disposed between U-phase coil 21 and V-phase coil 22.

In this embodiment, the first interphase insulating material 31 does not completely wrap the U-phase coil 21. First interphase insulating material 31 is wound only around the U-phase coil 21 in the region near the stator core 10 (i.e., near the root 20 a) in the axial direction a.

In the circumferential direction C of the stator core 10, the middle region 210 of the U-phase coil 21 is not wound with the first interphase insulating material 31. It will be appreciated that the inner peripheral side of the middle section 210 of U-phase coil 21 may be provided with various other possible forms of insulating material, such as sheet-like insulating material, for example, which will not be specifically described in this embodiment, in order to ensure effective insulation between the middle section 210 and the V-phase coil.

The middle region 210 is not completely covered by the first phase-to-phase insulation 31, which allows better entry of the enamel wire of the U-phase wire package 21 by the enamel-insulated paint in the subsequent enamel-dipping process.

The present utility model has at least one of the following advantages:

(i) The utility model adopts two different arrangement modes to set the insulating materials between different phase line bags, and takes into account the two aspects of good insulating effect and strong operability.

(ii) The first interphase insulating material 31 can complete winding before winding of other interfering windings, i.e., at the most convenient winding stage, so that the region between the U-phase wire package 21 and the V-phase wire package 22, which needs insulation, can be fully insulated and isolated, and is not easily interfered by subsequent processes.

(iii) The second phase-to-phase insulating material 32 is simple to set and is not easily displaced on the basis of the effective interval V-phase and W-phase packages.

Of course, the present utility model is not limited to the above-described embodiments, and various modifications may be made to the above-described embodiments of the present utility model by those skilled in the art in light of the present teachings without departing from the scope of the present utility model. For example:

(i) The specific winding mode of the stator winding is not limited, and the stator winding can be wound successively in the radial direction of the stator core only by meeting the requirement of the three-phase winding.

(ii) The specific material composition of the interphase insulating material (including the first interphase insulating material 31 and the second interphase insulating material 32) is not limited in this application. For example, in other possible embodiments, the interphase insulating material may be adhesive-backed, which may be any insulating paper known in the art, such as mica paper, aramid fiber paper, polyester fiber nonwoven, and insulating film. For another example, in the case of back-gluing the interphase insulating material tape, instead of using a glass cloth tape, an adhesive may be added to the back of any insulating paper in the prior art.

(iii) The constituent materials of the first interphase insulating material 31 and the second interphase insulating material 32 may be different.

Claims

1. A motor stator comprises a stator core (10), a winding (20) and an interphase insulating material (30), wherein the winding (20) comprises a U-phase winding, a V-phase winding and a W-phase winding which are sequentially arranged on the radial direction (R) of the stator core (10) from outside to inside, a U-phase coil (21) is formed by the part of the U-phase winding protruding from the stator core (10), a V-phase coil (22) is formed by the part of the V-phase winding protruding from the stator core (10), a W-phase coil (23) is formed by the part of the W-phase winding protruding from the stator core (10),

the interphase insulating material (30) includes a first interphase insulating material (31) and a second interphase insulating material (32),

the first interphase insulating material (31) is wound around at least a region of each of the U-phase coils (21) near the stator core (10) in the axial direction (a) of the stator core (10),

the second phase-to-phase insulating material (32) is disposed between the V-phase coil (22) and the W-phase coil (23) in an unwound manner.

2. The motor stator according to claim 1, characterized in that said first interphase insulating material (31) completely winds each of said U-phase packages (21).

3. An electric motor stator according to claim 1, characterized in that the first interphase insulating material (31) is wound only around two spaced apart regions of each U-phase coil (21) adjacent to the stator core (10) in the axial direction (a) of the stator core (10),

in a circumferential direction (C) of the stator core (10), a central region (210) of the U-phase coil (21) is not wound with the first phase-to-phase insulating material (31).

4. A stator of an electric machine according to claim 1, characterized in that the first phase-to-phase insulating material (31) is in the form of a strip and is wound around the U-phase coil by means of a spiral winding, the first phase-to-phase insulating material (31) between every two adjacent threads having overlapping portions.

5. A motor stator according to claim 4, characterized in that the width (D) of the first interphase insulating material (31) is 2 times the pitch (S) of the spiral winding.

6. The motor stator according to claim 1, characterized in that the first interphase insulating material (31) does not entirely cover the U-phase coil (21) in a region of the U-phase coil located radially outside the stator core (10).

7. The motor stator according to claim 1, characterized in that the surface of the first interphase insulating material (31) facing the U-phase coil (21) has an adhesive property.

8. The electric machine stator according to claim 1, characterized in that said second inter-phase insulating material (32) has a plurality of pieces, each piece of said second inter-phase insulating material (32) being arranged between an adjacent one of said V-phase packs (22) and one of said W-phase packs (23).

9. The motor stator according to claim 8, characterized in that the second phase-to-phase insulating material (32) comprises a body portion (321), the body portion (321) being arcuate with an opening (320), the opening (320) being arranged between two roots (20 a) at both ends of one of the V-phase packs (22).

10. The motor stator according to claim 9, characterized in that the second inter-phase insulating material (32) further includes two lug portions (322), each of the lug portions (322) being located at a region of one end of the main body portion (321) near the opening (320), the lug portions (322) being adhered to the root portion (20 a).