CN116961268A

CN116961268A - Stator and motor

Info

Publication number: CN116961268A
Application number: CN202310901903.6A
Authority: CN
Inventors: 李国俊
Original assignee: Wuxi Xingqu Technology Co ltd; Wuxi Xingqu Power Technology Co ltd; Zhejiang Geely Holding Group Co Ltd
Current assignee: Wuxi Xingqu Technology Co ltd; Wuxi Xingqu Power Technology Co ltd; Zhejiang Geely Holding Group Co Ltd
Priority date: 2023-07-20
Filing date: 2023-07-20
Publication date: 2023-10-27

Abstract

The application provides a stator and a motor. The stator includes a stator assembly and a coil. The coil includes windings. The windings are located outside the stator assembly in the axial direction of the stator assembly. The stator assembly is provided with channels for the cooling medium to pass through. The channel is provided with a first channel extending in the axial direction of the stator assembly. The first channel is provided with an inlet and an outlet. The cooling medium enters the first passage via the inlet. The cooling medium passing out through the outlet is sprayed toward the windings. The inlet is located outside the outlet in the radial direction of the stator assembly. The outlet is close to the central axis of the stator assembly, so that the cooling medium is directly sprayed to the winding when sprayed from the outlet, the problem that the cooling medium is directly sprayed without passing through the winding is solved, a cooling effect is provided, and the motor has a better heat dissipation effect; meanwhile, no other parts such as an oil ring and an oil pipe are needed, so that the cost and the manufacturing difficulty of the motor are reduced, and the performance of the motor is improved.

Description

Stator and motor

Technical Field

The application relates to the field of motors, in particular to a stator and a motor.

Background

Reliability and advancement of motor heat dissipation design are key to guaranteeing motor operation life and operation efficiency. The motor includes a stator assembly and a coil. The existing motor is provided with an oil duct in the stator assembly, and cooling oil flowing through the oil duct brings away heat generated by the stator, and meanwhile, the cooling oil is sprayed to the coil to bring away heat generated by the coil. The existing motor has the problem that cooling oil does not pass through a coil when being sprayed out, so that the heat dissipation effect of the motor is reduced.

Disclosure of Invention

The application provides a stator and a motor with good heat dissipation effect.

The application provides a stator, which comprises a stator assembly and a coil, wherein the coil comprises a winding, the winding is positioned at the outer side of the stator assembly along the axial direction of the stator assembly, the stator assembly is provided with a channel for a cooling medium to pass through, the channel is provided with a first channel extending along the axial direction of the stator assembly, the first channel is provided with an inlet and an outlet, the cooling medium enters the first channel through the inlet, the cooling medium passing through the outlet is sprayed to the winding, and the inlet is positioned at the outer side of the outlet along the radial direction of the stator assembly.

Further, the stator assembly includes a plurality of stator punching pieces that stack together, and is a plurality of the stator punching pieces are equipped with the through-hole that runs through respectively, first passageway includes a plurality of in proper order intercommunication the through-hole, along the axial direction of stator assembly, at least a plurality of the through-hole dislocation sets in order to change the trend of cooling medium, or, along the axial direction of stator assembly, at least a plurality of the through-hole slope sets in order to change the trend of cooling medium.

Further, the cross-sectional areas of the plurality of through holes which are sequentially communicated gradually decrease along the axial direction of the stator assembly and toward the winding direction.

Further, the stator assembly is provided with a plurality of channels, and the channels are distributed and arranged along the circumferential direction of the stator assembly.

Further, the stator assembly includes a channel disposed about a circumferential direction of the stator assembly, the channel in communication with the channel.

Further, the passage includes a second passage that communicates the first passage with the channel, and the first passage is located outside the second passage in an axial direction of the stator assembly.

Further, the stator assembly includes a plurality of stator laminations stacked together, the channel and the second channel each being recessed from an outer surface of one of the stator laminations.

Further, the stator assembly encloses into the cavity, the stator assembly be equipped with the accepting groove of cavity intercommunication, the coil include with the connecting portion that the winding is connected, connecting portion accept in the accepting groove, along the radial direction of stator assembly, the passageway is located the outside of accepting groove.

The embodiment of the application also provides a motor, which comprises a shell and the stator, wherein the shell encloses a containing cavity, the stator assembly and the coil are both positioned in the containing cavity, the shell is provided with an opening for a cooling medium to pass through, and the opening is communicated with the channel.

Further, a projection of the opening onto the stator assembly does not overlap the channel.

Further, the motor includes a storage tank, the housing is provided with a first opening communicated with the storage tank, the first opening is used for a cooling medium sprayed to the winding to pass through so as to enter the storage tank, the storage tank is provided with a second opening, and the second opening is communicated with the storage tank and the opening so as to enable the cooling medium in the storage tank to pass through and enter the opening.

The stator assembly of the embodiment of the application is provided with the first channel extending along the axial direction of the stator assembly, the first channel is provided with the inlet and the outlet, the cooling medium enters the first channel through the inlet, the cooling medium penetrating out through the outlet is sprayed to the winding, the inlet is positioned at the outer side of the outlet along the radial direction of the stator assembly, the outlet is close to the central axis of the stator assembly, and the cooling medium is directly sprayed to the winding when being sprayed out from the outlet, so that the problem that the cooling medium is not directly sprayed out through the winding is solved, the cooling effect is provided, and the motor has a better heat dissipation effect.

Drawings

FIG. 1 is a schematic diagram of an electric machine according to an exemplary embodiment of the present application;

FIG. 2 is a schematic cross-sectional view of the housing and storage case of the motor shown in FIG. 1;

FIG. 3 is a schematic cross-sectional view of the housing and stator assembly of the motor of FIG. 1 assembled;

FIG. 4 is a schematic illustration of a stator assembly of the motor shown in FIG. 1;

FIG. 5 is an enlarged view of the circled portion at A of the schematic diagram shown in FIG. 4;

FIG. 6 is an enlarged view of the circled portion at B of the schematic diagram shown in FIG. 4;

FIG. 7 is a schematic cross-sectional view of the stator assembly shown in FIG. 4;

FIG. 8 is an enlarged view of the circled portion at C of the cross-sectional schematic view shown in FIG. 7;

fig. 9 is an exploded view of the stator assembly shown in fig. 4.

Reference numerals illustrate: a housing, 1; a housing chamber (11); an opening 12; a first opening, 14; a stator, 2; a stator assembly, 21; a cavity, 211; a housing groove 212; a channel 213; a first channel, 2131; an inlet 2132; an outlet 2133; a second channel 2134; stator laminations, 214; through holes 2141; a channel 215; a coil 22; windings 221; a connection portion 222; a storage box 3; and a second opening, 31.

Detailed Description

Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus consistent with aspects of the application as detailed in the accompanying claims.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. Unless defined otherwise, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this application belongs. The terms "first," "second," and the like in the description and in the claims, are not used for any order, quantity, or importance, but are used for distinguishing between different elements. Likewise, the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. "plurality" or "plurality" means two or more. Unless otherwise indicated, the terms "front," "rear," "lower," and/or "upper" and the like are merely for convenience of description and are not limited to one location or one spatial orientation. The word "comprising" or "comprises", and the like, means that elements or items appearing before "comprising" or "comprising" are encompassed by the element or item recited after "comprising" or "comprising" and equivalents thereof, and that other elements or items are not excluded. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. As used in this specification and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any or all possible combinations of one or more of the associated listed items.

Referring to fig. 1 to 3, an electric motor according to an embodiment of the present application includes a housing 1 and a stator 2. The housing 1 encloses a receiving chamber 11. The stator 2 includes a stator assembly 21 and coils 22. The stator assembly 21 and the coil 22 are both positioned in the housing cavity 11. The housing 1 is provided with openings 12 for the passage of cooling medium into the interior of the motor for heat dissipation of the motor.

The coil 22 includes windings 221. The windings 221 are located outside the stator assembly 21 in the axial direction of the stator assembly 21. The stator assembly 21 encloses a cavity 211. The stator assembly 21 is provided with a receiving groove 212 communicating with the cavity 211. The coil 22 includes a connection portion 222 connected to the winding 221. The connecting portion 222 is accommodated in the accommodating groove 212.

The motor comprises a storage tank 3. The housing 1 is provided with a first opening 14 communicating with the storage tank 3. The first opening 14 is provided for the passage of the cooling medium through the winding 221 to enter the storage tank 3. The storage tank 3 is provided with a second opening 31. The second opening 31 communicates the tank 3 with the opening 12, so that the cooling medium in the tank 3 passes through and into the opening 12.

The storage box 3 may be integrally provided with the housing 1, or may be separately provided. The second opening 31 and the opening 12 may communicate through the communication pipe 4.

The motor includes a pump (not shown). The pump is used to pump the cooling medium in the storage tank 3 into the opening 12.

The motor further comprises a rotor (not shown). The rotor is located within the cavity 211. The stator 2 is capable of generating a rotating magnetic field when a current is applied to the coil 22. The rotor can rotate under the action of a rotating magnetic field. A cooling medium enters the interior of the motor to dissipate heat from the stator assembly 21 and the coils 22. The cooling medium may be a gas or a liquid, such as cooling oil or cooling water.

Referring to fig. 4 to 9, the stator assembly 21 is provided with a passage 213 for a cooling medium to pass through. The channel 213 is provided with a first channel 2131 extending in the axial direction of the stator assembly 21. The first passageway 2131 is provided with an inlet 2132 and an outlet 2133. The cooling medium enters the first passage 2131 via the inlet 2132. The cooling medium passing out through the outlet 2133 is sprayed toward the windings 221. The inlet 2132 is located outside the outlet 2133 in the radial direction of the stator assembly 21. The outlet 2133 is close to the central axis of the stator assembly 21, and the cooling medium is directly sprayed to the windings 221 when sprayed from the outlet 2133, so as to solve the problem that the cooling medium is directly sprayed without passing through the windings 221, thereby providing a cooling effect and enabling the motor to have a better heat dissipation effect; meanwhile, no other parts such as an oil ring and an oil pipe are needed, so that the cost and the manufacturing difficulty of the motor are reduced, and the performance of the motor is improved.

The first passages 2131 are located outside the receiving slots 212 in the radial direction of the stator assembly 21.

The passage 213 is provided with a second passage 2134 extending in the axial direction of the stator assembly 21, the second passage 2134 being in communication with the first passage 2131. The first passages 2131 are located outside the second passages 2134 in the axial direction of the stator assembly 21.

The second channel 2134 may be linear to facilitate forming; the second passages 2134 may also be obliquely arranged.

The stator assembly 21 includes a plurality of stator laminations 214 stacked together. The stator laminations 214 are respectively provided with through holes 2141. The first passage 2131 includes a plurality of through holes 2141 which are sequentially communicated. At least a plurality of the through holes 2141 are arranged offset in the axial direction of the stator assembly 21 to change the direction of the cooling medium so that the cooling medium is sprayed toward the windings 221 when being sprayed from the outlet 2133; meanwhile, the plurality of through holes 2141 arranged in a staggered manner can slow down the flow velocity of the cooling medium, so as to prolong the residence time of the cooling medium and improve the heat dissipation effect. Optionally, at least a plurality of the through holes 2141 are disposed obliquely along the axial direction of the stator assembly 21 to change the direction of the cooling medium so that the cooling medium is sprayed toward the windings 221 when being sprayed from the outlet 2133.

The through holes 2141 do not penetrate the edge of the stator plate 214, so that the cooling medium sprayed from the outlet 2133 is sprayed to the windings 221 as much as possible to improve heat dissipation.

The through hole 2141 may be a circular hole or a square hole, and the shape of the through hole 2141 is not limited in the present application.

In the axial direction of the stator assembly 21 and toward the winding 221, the cross-sectional areas of the plurality of through holes 2141 that communicate in turn gradually decrease, that is, the plurality of through holes 2141 gradually decrease, ensuring that the outlet 2133 is toward the winding 221.

The through holes 2141 may be uniform in size along the thickness direction of the stator lamination 214, so that the through holes 2141 are easy to be formed, thereby reducing the processing cost.

The stator assembly 21 is provided with a plurality of channels 213, and the channels 213 are distributed along the circumferential direction of the stator assembly 21 to cool a plurality of parts of the stator assembly 21, so as to improve the heat dissipation effect; meanwhile, the cooling medium is sprayed toward the winding 221 from a plurality of directions to improve the heat dissipation effect.

Optionally, a plurality of the channels 213 are uniformly distributed along the circumferential direction of the stator assembly 21. The outlets 2133 of the plurality of channels 213 may be spaced apart from the central axis of the stator assembly 21 by unequal distances to dissipate heat from different portions of the winding 221 to enhance heat dissipation.

The stator assembly 21 is provided with channels 215, the channels 215 being arranged around the circumferential direction of the stator assembly 21, the channels 215 being in communication with the channels 213.

The second passageway 2134 communicates the first passageway 2131 with the channel 215. The channels 215 and the second channels 2134 are each recessed from an outer surface of one of the stator laminations 214. Alternatively, the channels 215 may be provided inside the stator assembly 21 without penetrating the outer surface.

The second channels 2134 are disposed crosswise to the channel 215 and perpendicular to each other. The projection of the opening 12 on the stator assembly 21 is not overlapped with the channel 213, so as to prolong the flow path of the cooling medium on the stator assembly 21, thereby improving the heat dissipation effect. The opening 12 is located at the outer side of the channel 215 and is in communication with the channel 215, and the cooling medium entering the opening 12 enters the second channel 2134 via the channel 215, then enters the first channel 2131, and then is sprayed to the winding 221, so that the contact time between the cooling medium and the stator assembly is prolonged, and the heat dissipation effect is improved, compared with the case that the cooling medium entering the opening 12 is directly connected into the second channel 2134.

The second passage 2134 may be connected to the first passage 2131 through a communication hole without intersecting with the first passage. The second channels 2134 may not be perpendicular when intersecting the channels 215.

The outer side surface of the stator assembly 21 is attached to the inner side surface of the housing 1, so that cooling medium is prevented from entering a gap between the stator assembly 21 and the housing 1, and the utilization rate of the cooling medium is improved, so that the heat dissipation effect is improved.

The channel 215 may be provided in plurality. The plurality of channels 215 are arranged along the axial direction of the stator assembly 21 to further enhance the heat dissipation effect.

The coil 22 includes a pair of the windings 221. The pair of windings 221 are connected to both ends of the connection portion 222. A pair of the windings 221 are located on both sides of the stator assembly 21, respectively, in the axial direction of the stator assembly 21. The channel 215 is located in the middle of the stator assembly 21, and the channel 213 includes a pair of first channels 2131 and a pair of second channels 2134. Along the axial direction of the stator assembly 21, a pair of second passages 2134 are located on either side of the slot 215, and a pair of first passages 2131 are located on the outside of the pair of second passages 2134. The opening 12 is located in the middle of the housing 1, and the cooling medium entering the opening 12 enters the channel 215, flows along the pair of second channels 2134 to the two ends of the stator assembly 21, then enters the pair of first channels 2131, and is sprayed to the pair of windings 221 through the pair of outlets 2133.

A plurality of the openings 12 may be provided, and the present application is not limited to the number of the openings 12. The opening 12 may also be provided near one end of the housing 1.

The present application is not limited to the above-mentioned embodiments, but is not limited to the above-mentioned embodiments, and any person skilled in the art can make some changes or modifications to the above-mentioned embodiments without departing from the scope of the present application.

Claims

1. The stator is characterized by comprising a stator assembly and a coil, wherein the coil comprises a winding, the winding is positioned on the outer side of the stator assembly along the axial direction of the stator assembly, the stator assembly is provided with a channel for a cooling medium to pass through, the channel is provided with a first channel extending along the axial direction of the stator assembly, the first channel is provided with an inlet and an outlet, the cooling medium enters the first channel through the inlet, the cooling medium passing through the outlet is sprayed to the winding along the radial direction of the stator assembly, and the inlet is positioned on the outer side of the outlet.

2. The stator of claim 1, wherein the stator assembly comprises a plurality of stator laminations stacked together, the plurality of stator laminations each having a through hole therethrough, the first passage comprises a plurality of through holes that are sequentially connected, at least a plurality of the through holes are offset along an axial direction of the stator assembly to change a direction of the cooling medium, or at least a plurality of the through holes are inclined along the axial direction of the stator assembly to change the direction of the cooling medium.

3. The stator according to claim 2, wherein a plurality of the through holes which are sequentially communicated gradually decrease in cross-sectional area in an axial direction of the stator assembly and toward the winding direction.

4. The stator according to claim 1, wherein the stator assembly is provided with a plurality of the passages distributed along a circumferential direction of the stator assembly.

5. The stator of claim 1, wherein the stator assembly includes a channel disposed about a circumferential direction of the stator assembly, the channel in communication with the channel.

6. The stator of claim 5, wherein the passage includes a second passage that communicates the first passage with the channel, the first passage being located outside the second passage in an axial direction of the stator assembly.

7. The stator of claim 6 wherein the stator assembly comprises a plurality of stator laminations stacked together, the channel and the second channel each being recessed from an outer surface of one of the stator laminations.

8. The stator according to any one of claims 1 to 7, wherein the stator assembly encloses a cavity, the stator assembly is provided with a receiving slot in communication with the cavity, the coil includes a connection portion connected to the winding, the connection portion is received in the receiving slot, and the passage is located outside the receiving slot in a radial direction of the stator assembly.

9. An electric machine comprising a housing and a stator as claimed in any one of claims 1 to 8, the housing enclosing a receiving cavity, the stator assembly and the coil being located within the receiving cavity, the housing being provided with an opening for a cooling medium to pass through, the opening communicating with the passage.

10. The electric machine of claim 9, wherein a projection of the opening onto the stator assembly does not overlap the channel.

11. The electric machine of claim 9, wherein the electric machine includes a storage tank, the housing being provided with a first opening in communication with the storage tank, the first opening being for passage of cooling medium sprayed toward the windings into the storage tank, the storage tank being provided with a second opening in communication with the storage tank and the opening for passage of cooling medium within the storage tank into the opening.