CN117728611A - Stator assembly and motor - Google Patents

Abstract

Embodiments of the present application provide a stator assembly and a motor, the stator assembly comprising: a stator core, a stator winding, and a heat conductive member, the stator winding having end windings extending from both axial ends of the stator core, a gap being provided between each wire of the end windings; the heat conducting member is at least partially filled in the gaps of the end windings at both ends, and a part or all of the outer peripheral surface of the heat conducting member is used for forming part of the surface of the heat dissipation channel through which the cooling medium flows. According to the stator assembly and the motor, the heat dissipation efficiency of the stator winding can be improved.

Description

Stator assembly and motor

Technical Field

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

Background

The closed motor generally adopts a water cooling or shell air cooling mode to cool the motor, and cooling air does not enter the motor, so that a higher protection level can be achieved. However, the heat transfer efficiency of the cooling channel and the motor winding with serious heat generation is low, and the heat of the motor cannot be sufficiently and rapidly taken out of the motor, so that the problems of high temperature and reduced reliability of the motor occur during driving.

Disclosure of Invention

In view of this, the embodiment of the application provides a stator assembly and a motor, which can improve the heat dissipation efficiency of the motor.

To achieve the above object, embodiments of the present application provide a stator assembly, including:

a stator core;

a stator winding having end windings protruding from both axial ends of the stator core with gaps between respective wires of the end windings;

and a heat conductive member at least partially filled in the gaps between the end windings at both ends, wherein a part or all of the outer peripheral surface of the heat conductive member is used for forming a part of the surface of a heat dissipation channel through which the cooling medium flows.

In some embodiments, the heat conducting member includes a sleeve and a first heat conducting filling part, the sleeve is sleeved on the end winding, and the first heat conducting filling part is filled in a gap of the end winding and between the end winding and the sleeve;

wherein the thermal conductivity of the material of the sleeve is greater than the thermal conductivity of the material of the first thermally conductive filler.

In some embodiments, the sleeve includes a barrel and a set of heat dissipating fins protruding from an outer circumferential surface of the barrel.

In some embodiments, the outer peripheral surface of the stator core has a plurality of groups of through holes, each of which forms part of the surface of the heat dissipation channel;

the number of the radiating fin groups is multiple, and each radiating fin group is correspondingly arranged on the inlet side and the outlet side of each pore canal.

In some embodiments, the radiating tooth set includes a connecting piece and a radiating portion disposed on the connecting piece, where one surface of the connecting piece, which faces away from the radiating portion, is attached to the outer circumferential surface of the cylinder.

In some embodiments, a second thermally conductive filler is filled between the connecting piece and the outer circumferential surface of the cylinder.

In some embodiments, the heat dissipation portion includes a plurality of heat dissipation fins that are distributed at intervals, one ends of any two adjacent heat dissipation fins, which are far away from the connecting piece, are connected to each other to form a heat dissipation fin group, and one ends, close to the connecting piece, of two heat dissipation fins, which are close to each other, in the heat dissipation fin group are connected to each other.

In some embodiments, the stator assembly includes an inner cylinder disposed at two ends of the stator core and located inside the end winding, the inner cylinder, the sleeve, and the stator core enclosing a cavity, and the first thermally conductive filling portion is filled in the cavity.

In some embodiments, the sleeve comprises a cylinder body and a plurality of heat conducting ribs which are arranged on the cylinder body and protrude inwards, and each heat conducting rib is arranged at intervals along the circumferential direction of the cylinder body.

Embodiments of the present application provide an electric machine comprising a housing, and a stator assembly;

the heat conducting piece is characterized in that a heat dissipation channel is formed by surrounding the outer peripheral surface of the heat conducting piece, the outer peripheral surface of the stator core and the shell, an air inlet communicated with the heat dissipation channel is formed in one end of the shell, and an air outlet communicated with the heat dissipation channel is formed in the other end of the shell.

The embodiment of the application provides a motor, the motor includes the shell to and stator module, the motor includes the filter screen, the filter screen covers the air intake, the radial minimum size of the mesh of dust filtering net is less than adjacent the interval width of fin.

According to the stator assembly and the motor, the heat conducting piece is filled in the gap of the end winding and wraps the end winding, so that heat of the end winding is accelerated to be transferred to the surface of the end winding, and meanwhile heat dissipation uniformity is improved. The outer peripheral surface of the heat conducting member is used for forming part of the surface of the heat radiating channel for the cooling medium to circulate, so that heat on the surface of the heat conducting member is directly taken away by the cooling medium, thereby reducing a heat transfer path and improving heat transfer efficiency.

Drawings

FIG. 1 is a partial cross-sectional view of an electric machine according to an embodiment of the present application;

FIG. 2 is a schematic diagram of the cooling medium flow of the motor of FIG. 1;

FIG. 3 is a schematic view of a sleeve of the motor of FIG. 1;

FIG. 4 is a front view of a sleeve of the motor of FIG. 3;

fig. 5 is a partial cross-sectional view of the sleeve of fig. 3.

Description of the reference numerals

A stator core 10; a duct 11; a stator winding 20; an end winding 21; a heat conductive member 30; a sleeve 31; a cylinder 311; fin group 312; a connection piece 3121; a heat radiation portion 3122; a heat sink 31221; fin group 3122a; lugs 313; a thermally conductive rib 314; a first thermally conductive filler 32; a second heat conductive filling part 33; a heat dissipation channel 40; an inner cylinder 50;

a housing 200; an air inlet 210; and an outlet 220.

Detailed Description

Embodiments of the present application are described in further detail below with reference to the accompanying drawings and examples. The following examples are illustrative of the present application but are not intended to limit the scope of the present application.

In the description of the embodiments of the present application, it should be noted that, the directions or positional relationships indicated by the terms "front", "rear", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the devices or elements to be referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the embodiments of the present application. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the related art, an electric machine has a stator assembly disposed inside a casing and a rotor assembly disposed inside the stator assembly. When a current is applied to the motor, heat is generated in the stator winding coupled to the stator core in addition to electromagnetic force, and the heat is radiated through a radiation passage arranged in the axial direction of the housing or the outer ring of the stator core.

Among them, the heat transfer path between the winding coil and the cooling channel is long, and its heat transfer efficiency is low, and especially for the stator winding protruding to the outside beyond both side ends of the stator core, since it is directly exposed to the air and is not in contact with any object that can transfer heat, the heat generated at both side ends of the stator winding or transferred to the ends can be dissipated only through the heat transfer path released to the air, and the heat dissipation efficiency is very low, which can cause the heat accumulation to cause the temperature of the motor to rise, thus reducing the reliability of the motor.

In this regard, referring to fig. 1 and 2, the embodiment of the present application provides a stator assembly, which includes a stator core 10, a stator winding 20, and a heat conducting member 30.

It will be appreciated that the stator winding 20 is formed of a plurality of wires which are threaded through the stator core 10. The stator winding 20 has end windings 21 protruding from both axial ends of the stator core 10. There are gaps between the wires of the end windings 21, i.e. between the wires extending outside the stator core 10. In fig. 1, the axial direction of the stator core 10 is the front-rear direction.

The heat conductive member 30 is at least partially filled in the gaps of the end windings 21 at both ends, that is, the heat conductive member 30 is partially or entirely filled in the gaps of the end windings 21. It is understood that the heat conductive member 30 is formed in two parts corresponding to the end windings 21 at both ends of the stator core 10, respectively.

The heat of the end winding 21 can be quickly transferred to the heat conductive member 30. At least part of the outer peripheral surface of the heat conducting member 30 is used to form part of the surface of the heat dissipation channel through which the cooling medium flows, so that the heat of the heat conducting member 30 is taken away by the flowing cooling medium to achieve rapid heat dissipation. The heat conductive member 30 filled in the gap between the end windings 21 improves the heat radiation uniformity of the end windings 21, and can prevent the service life from being reduced due to local excessive temperature.

The embodiment of the present application further provides an electric machine, referring to fig. 1 and 2, the electric machine includes a housing 200, a stator assembly, and a rotor assembly. Wherein the stator assembly is disposed inside the housing 200 and the rotor assembly is disposed inside the stator assembly at intervals.

It will be appreciated that the motor may be configured directly or may be suitably modified to accommodate the structure of the housing 200, stator assembly, and rotor assembly of a known motor. For example: the rotor assembly may be a rotor of a permanent magnet type synchronous motor adapted to insert a permanent magnet into a rotor core, or may be a squirrel cage rotor made of aluminum or copper, or may be a rotor of a wound field synchronous motor adapted to wind a rotor winding around a rotor core.

The heat dissipation path 40 is defined by the outer peripheral surface of the heat conductive member 30, the outer peripheral surface of the stator core 10, and the housing 200. A cooling medium such as air flows in the heat dissipation path 40 to take away heat of the heat conductive member 30 and the stator core 10.

It will be appreciated that one end of the housing 200 is provided with an air inlet 210 in communication with the heat dissipation channel 40, and the other end of the housing 200 is provided with an air outlet 220 in communication with the heat dissipation channel 40. In this way, the cooling medium flows into the motor from one end of the casing 200, and sequentially passes through the outer peripheral surface of the heat conductor 30 at one end of the stator core 10, the outer peripheral surface of the stator core 10, and the outer peripheral surface of the heat conductor 30 at the other end of the stator core 10. Heat exchange is generated with the motor, so that rapid heat dissipation and temperature reduction are realized, and the heat dissipation characteristic of the motor is greatly improved.

In some embodiments, the thermally conductive member 30 is a first thermally conductive filler that fills in the gaps of the end windings 21 and wraps the end windings 21. The first heat-conducting filling part can be a silicone grease material.

In some embodiments, referring to fig. 1, the heat conducting member 30 includes a sleeve 31 and a first heat conducting filling portion 32, the sleeve 31 is sleeved on the end winding 21, that is, the sleeve 31 is disposed on an outer side of the end winding 21, it is understood that the outer side is a side of the end winding 21 close to the rotor assembly, and the inner side is a side of the end winding 21 facing away from the rotor assembly.

The first heat conductive filling portion 32 fills in the gap of the end winding 21 and between the end winding 21 and the sleeve 31. At this time, part or all of the outer peripheral surface of the sleeve 31 constitutes part of the surface of the heat dissipation passage 40, and the heat of the end winding 21 is transferred to the sleeve 31 through the first heat conduction filling part 32, and is cooled by heat exchange between the sleeve 31 and the cooling medium. The thermal conductivity of the material of the sleeve 31 is greater than that of the first thermal conductive filling portion 32, so as to improve the heat exchange efficiency of the thermal conductive member 30 and the cooling medium, that is, improve the heat dissipation efficiency of the stator winding 20.

In some embodiments, the stator assembly includes an inner cylinder 50, and the inner cylinder 50 is disposed at both ends of the stator core 10 and inside the end winding 21. At this time, the inner cylinder 50, the sleeve 31 and the stator core 10 enclose a cavity, and the first heat-conducting filling portion 32 is filled in the cavity, so as to facilitate the molding of the first heat-conducting filling portion 32. Further, the inner cylinder 50 may be made of a heat insulating material such as an aerosol fiber, so that radiation propagation of heat from the stator winding 21 to the space where the rotor portion is located can be avoided or reduced.

In the preparation process, the sleeve 31 and the inner cylinder 50 are fixed on the stator core 10, so that the sleeve 31, the inner cylinder 50 and the stator core 10 enclose a cavity. With one end of the motor facing up, a flowable paste-like thermally conductive filler, such as a two-component highly thermally conductive silicone gel, is filled into the cavity and submerges the end windings, after which it solidifies to form a first thermally conductive filler portion 32 at one end. The other end of the motor is turned upward, and the first heat conductive filler 32 at the other end is formed after repeated filling.

It will be appreciated that in some embodiments, the sleeve 31 comprises a barrel that exchanges heat with the cooling medium through the outer periphery of the barrel.

In some embodiments, referring to fig. 3, the sleeve 31 includes a cylinder 311 and a heat dissipation fin set 312 protruding from an outer peripheral surface of the cylinder 311. The protruding fin group 312 increases the heat radiation area of the sleeve 31, and accelerates the heat exchange speed with the cooling medium.

For example, referring to fig. 1 and 2, the outer peripheral surface of the stator core 10 has a plurality of groups of through holes 11 extending from front to back, the holes 11 are circular, elliptical or square, and each hole 11 forms part of the surface of the heat dissipation channel 40. That is, the cooling medium flows through each of the cells 11.

The number of the fin groups 312 is plural, and each fin group 312 is disposed on the inlet side and the outlet side of each duct 11, respectively. It will be appreciated that one end of the front-rear through-going duct 11 is an inlet side, the other end is an outlet side, and the inlet side and the outlet side of each duct 11 are provided with a heat dissipation fin group 312. In this way, the cooling medium flows into the duct 11 through the heat dissipation tooth set 312 at one side of the duct 11 in the length direction, and flows out through the heat dissipation tooth set 312 at the other side, so that the heat exchange area with the cooling medium is greatly increased, and the heat dissipation efficiency is improved.

As can be appreciated, referring to fig. 3 and 4, the sleeve 31 is fixedly connected to the stator core 10. In some embodiments, sleeve 31 includes lugs 313 that connect to barrel 311. The respective channels 11 are arranged in parallel at intervals along the outer circumferential surface of the stator core 10. The lugs 313 are positioned at the end surfaces of the stator core 10 and aligned with the spaces between the adjacent cells 11, and the lugs 313 are fastened to the stator core 10 by fasteners.

For example, referring to fig. 5, the heat dissipation fin set 312 includes a connection piece 3121 and a heat dissipation portion 3122 disposed on the connection piece 3121, and a surface of the connection piece 3121 facing away from the heat dissipation portion 3122 is attached to the outer circumferential surface of the cylinder 311. Heat is transferred from the cylinder 311 to the attachment tabs 3121 and through the attachment tabs 3121 to the heat sink 3122. Wherein, the connection piece 3121 is formed with a clamping groove (not shown in the figure), the openings of the clamping groove are distributed along the axial direction, and the clamping groove is clamped with one end of the cylinder 311 so as to quickly install and connect the heat dissipation tooth set 312.

To exclude air between the connection piece 3121 and the cylinder 311 and improve heat conduction efficiency, in some embodiments, a second heat conduction filling portion 33 is filled between the connection piece 3121 and the outer circumferential surface of the cylinder 311. The second heat-conducting filling part 33 is a gel heat-conducting material, such as a two-component high heat-conducting organic silica gel.

In some embodiments, the heat dissipation portion 3122 includes a plurality of heat dissipation fins 31221 distributed at intervals, wherein one ends of any two adjacent heat dissipation fins 31221 away from the connection piece 3121 are connected to each other to form a heat dissipation fin group 3122a, and one ends of two heat dissipation fins 31221 adjacent to each other in the adjacent heat dissipation fin group 3122a, which are adjacent to each other, are connected to each other. In this way, the heat dissipation portion 3122 can be formed by bending a plate body multiple times in the thickness direction thereof, so as to reduce manufacturing costs.

The thickness of the heat sink 31221 may be 0.2 mm-1 mm.

To improve the heat dissipation effect, in some embodiments, the width dimension of the fin group 312 along the circumferential direction of the cylinder 311 is larger than the width of the duct 11, so that the cooling medium can dissipate more heat through the heat dissipation portion 3122.

In some embodiments, to avoid interference of the fin sets 312 with the housing 200 while maintaining a high heat dissipation efficiency, the radial height of the fin sets 312 is between 80% and 100% of the height of the heat dissipation channel 40 in some embodiments.

It will be appreciated that the first thermally conductive filler 32 is in thermal contact with the inner wall of the cylinder 311.

In order to improve the heat transfer efficiency between the cylinder 311 and the first heat conductive filler 32. In some embodiments, referring to fig. 3 and 4, the sleeve 31 includes a plurality of heat conducting ribs 314 disposed on an inner wall of the cylinder 311 and protruding inwards, each heat conducting rib 314 is disposed at intervals along a circumferential direction of the cylinder 311, and the first heat conducting filling portion 32 is filled between adjacent heat conducting ribs 314 and covers each heat conducting rib 314. Thereby increasing the contact area between the first heat-conducting filling part 32 and the cylinder 311, improving the heat exchange speed and enhancing the structural strength of the sleeve 31.

It is understood that the cylinder 311 and the heat conductive ribs 314 may be connected by welding or integrally cast.

To further improve the heat transfer efficiency. In some embodiments, the thickness of the heat-conducting rib 314 gradually decreases inward from one end of the connecting cylinder 311, so that more part of the heat-conducting rib 314 is close to the end winding 21, and heat exchange efficiency of the end winding 21 between the heat-conducting rib 314 and the cylinder 311 is improved.

It will be appreciated that the shape of the thermally conductive ribs 314 is not limited and is specifically determined by the spacing between the end windings 21 and the inner wall of the cylinder 311. In fig. 1, since there is a triangular region in the distance between the end winding 21 and the cylinder 311, the heat-conducting bead 314 is triangular in shape in this embodiment, and the heat-conducting bead 314 is disposed at one end of the inner wall of the cylinder 311 near the stator assembly.

It is understood that the cylinder 311 can be provided with a plurality of heat conducting ribs 314 axially, for example, a plurality of heat conducting ribs 314 are also provided at an end of the cylinder 311 facing away from the stator assembly, so as to improve heat dissipation efficiency.

In some embodiments, the motor further includes a filter screen (not shown) that covers the air inlet 210 to filter the cooling medium, such as air, flowing into the motor. Wherein the radial minimum dimension of the mesh of the dust filter net is smaller than the space width of the adjacent heat radiating fin 31221. So as to prevent foreign matters from being blocked on the cooling fin 31221 after entering, thereby affecting the circulation of the cooling medium.

In the description of the present application, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the embodiments of the present application. In this application, the schematic representations of the above terms are not necessarily for the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the various embodiments or examples described herein, as well as the features of the various embodiments or examples, may be combined by those skilled in the art without contradiction.

The foregoing description is only of the preferred embodiments of the present application and is not intended to limit the same, but rather, various modifications and variations can be made by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims (11)

1. A stator assembly, the stator assembly comprising:

a stator core;

a stator winding having end windings protruding from both axial ends of the stator core with gaps between respective wires of the end windings;

and a heat conductive member at least partially filled in the gaps between the end windings at both ends, wherein a part or all of the outer peripheral surface of the heat conductive member is used for forming a part of the surface of a heat dissipation channel through which the cooling medium flows.

2. The stator assembly of claim 1, wherein the thermally conductive member comprises a sleeve and a first thermally conductive filler, the sleeve being disposed over the end windings, the first thermally conductive filler being filled in the gap between the end windings and the sleeve;

wherein the thermal conductivity of the material of the sleeve is greater than the thermal conductivity of the material of the first thermally conductive filler.

3. The stator assembly of claim 2 wherein the sleeve comprises a barrel and a set of heat dissipating fins protruding from an outer peripheral surface of the barrel.

4. A stator assembly according to claim 3, wherein the outer peripheral surface of the stator core has a plurality of sets of front-rear through-holes, each of the holes constituting a part of the surface of the heat dissipation passage;

the number of the radiating fin groups is multiple, and each radiating fin group is correspondingly arranged on the inlet side and the outlet side of each pore canal.

5. A stator assembly according to claim 3, wherein the radiating fin group comprises a connecting piece and a radiating portion arranged on the connecting piece, and one surface of the connecting piece, which faces away from the radiating portion, is attached to the outer circumferential surface of the cylinder.

6. The stator assembly of claim 5, wherein a second thermally conductive filler is filled between the tab and the outer peripheral surface of the barrel.

7. A stator assembly according to claim 5 wherein said heat sink comprises a plurality of spaced apart fins, wherein the ends of any adjacent two of said fins remote from said connecting tabs are interconnected to form a fin array, and wherein the ends of adjacent ones of said fins adjacent one another are interconnected at the ends of adjacent ones of said fins adjacent said connecting tabs.

8. The stator assembly of claim 2, wherein the stator assembly includes an inner cylinder disposed at two ends of the stator core and inside the end windings, the inner cylinder, the sleeve and the stator core enclosing a cavity, the first thermally conductive filler being filled in the cavity.

9. The stator assembly of claim 2, wherein the sleeve includes a barrel and a plurality of inwardly projecting thermally conductive ribs disposed on the barrel, each of the thermally conductive ribs being circumferentially spaced along the barrel.

10. An electric machine comprising a housing and a stator assembly as claimed in any one of claims 1 to 9;

the heat conducting piece is characterized in that a heat dissipation channel is formed by surrounding the outer peripheral surface of the heat conducting piece, the outer peripheral surface of the stator core and the shell, an air inlet communicated with the heat dissipation channel is formed in one end of the shell, and an air outlet communicated with the heat dissipation channel is formed in the other end of the shell.

11. An electric motor comprising a housing, and a stator assembly as claimed in claim 7, the motor comprising a screen covering the air intake, the dust screen having a mesh with a radial minimum dimension less than the width of the space adjacent the cooling fins.