CN120110089A

CN120110089A - Heat sink, rotor assembly and motor

Info

Publication number: CN120110089A
Application number: CN202510586983.XA
Authority: CN
Inventors: 李佳; 刘涛; 张海波; 赵磊; 孙锋; 谭书馨; 吕坤; 高彦明; 程诗明; 张彬; 张勰; 王文辉; 刘立昂; 周光厚; 刘小松
Original assignee: Engineering Construction Management Branch Of China Southern Power Grid Peak Load Regulation And Frequency Modulation Power Generation Co ltd; Guangzhou Qi'an Zhongzhi Construction Management Co ltd; Dongfang Electric Machinery Co Ltd DEC
Current assignee: Engineering Construction Management Branch Of China Southern Power Grid Peak Load Regulation And Frequency Modulation Power Generation Co ltd; Guangzhou Qi'an Zhongzhi Construction Management Co ltd; Dongfang Electric Machinery Co Ltd DEC
Priority date: 2025-05-08
Filing date: 2025-05-08
Publication date: 2025-06-06
Anticipated expiration: 2045-05-08
Also published as: CN120110089B

Abstract

The application relates to a heat dissipation part, a rotor assembly and a motor, wherein the heat dissipation part comprises a supporting ring and heat conduction strips, the heat conduction strips comprise heat dissipation sections and heat absorption sections which are connected, the heat dissipation sections are connected with the end face of the supporting ring, the heat absorption sections are located on the outer peripheral side of the supporting ring, the plurality of heat conduction strips are sequentially arranged along the circumferential direction of the supporting ring, and the heat absorption sections are parallel to winding bevel edges of rotor windings. According to the technical scheme, on the basis of solving the problems of corona discharge at the end part of the winding, heat dissipation and the like, the heat dissipation mode of the winding bevel edge can be more direct and rapid, so that the gap between two adjacent winding bevel edges can be reduced, and the length of the end part of the winding is reduced. Therefore, the leakage reactance of the end part and the heating value of the winding end part can be reduced, the weight of the winding end part can be reduced, the mechanical strength of the motor can be improved, and meanwhile, the winding end part can be supported through the heat conducting strip, so that the position stability of the winding end part can be improved. Finally, the reliability of the motor can be improved.

Description

Radiating piece, rotor assembly and motor

Technical Field

The application relates to the technical field of motors, in particular to a heat dissipation piece, a rotor assembly and a motor.

Background

The motor refers to an electromagnetic device for realizing electric energy and mechanical energy conversion according to an electromagnetic induction law. The generator motor is one type of motor, and can be used as a generator or a motor. The motor mainly comprises a shell, a stator assembly fixed in the shell and a rotor assembly rotatably arranged in the shell. The rotor assembly comprises a main shaft, an iron core sleeved on the main shaft and a rotor winding wound on the rotor iron core.

At present, the reliability of the motor is poor.

Disclosure of Invention

The embodiment of the application provides a heat dissipation piece which can improve the heat dissipation efficiency of a motor so as to at least solve the technical problems.

In order to achieve the above object, according to a first aspect of the present application, there is provided a heat dissipating member including a support ring and a heat sink, the heat sink including a heat dissipating section and a heat absorbing section connected to each other, the heat dissipating section being connected to an end surface of the support ring, the heat absorbing section being located on an outer peripheral side of the support ring, the heat sink having a plurality of heat sinks arranged in sequence along a circumferential direction of the support ring, wherein the heat absorbing section is parallel to an upper oblique side of a rotor winding or the heat absorbing section is parallel to a lower oblique side of the rotor winding or a part of the heat absorbing section of the heat sink is parallel to the upper oblique side, and the heat absorbing sections of the rest of the heat sinks are parallel to the lower oblique side.

Optionally, the heat conducting strip is provided with a heat dissipation runner, one part of the heat dissipation runner is arranged at the heat dissipation section, and the other part of the heat dissipation runner is arranged at the heat absorption section, wherein the heat dissipation runner is used for filling heat exchange medium.

Optionally, the heat dissipation runner comprises two first sub runners and two second sub runners, wherein the two ends of the two first sub runners are respectively arranged in the heat dissipation section and the heat absorption section, the two second sub runners are positioned between the two first sub runners, and the two ends of the two second sub runners are respectively arranged in the heat dissipation section and the heat absorption section;

and/or the heat conducting strip is provided with a threaded hole, the threaded hole is communicated with the heat dissipation runner, and the heat dissipation piece further comprises a threaded end socket which is in threaded connection with the threaded hole.

Optionally, the heat dissipation part further comprises a compression ring and a first screw, the axis of the compression ring is parallel to the axis of the support ring, the compression ring is located on one side of the heat dissipation section, which is away from the support ring, and the tail end of the rod part of the first screw penetrates through the compression ring and is in threaded connection with the support ring.

Optionally, a plurality of clamping grooves are formed in the supporting ring, one side of the heat dissipation section is inserted into the clamping grooves, and the other side of the heat dissipation section is abutted to the compression ring.

Optionally, a first step groove is formed on one side of the heat dissipation section facing the compression ring, and an inner ring surface of the compression ring is abutted with a groove wall on one side of the first step groove.

Optionally, a boss is convexly arranged on the surface of the support ring facing the heat dissipation section, a part of the surface of the heat dissipation section facing the support ring is connected with the boss, the rest part of the surface of the heat dissipation section facing the support ring is arranged at intervals with the support ring, and/or a weight reduction groove is arranged on the inner ring surface of the support ring and extends along the circumferential direction of the support ring.

Optionally, the heat absorbing sections of a part of the heat conducting strips are parallel to the upper inclined edge, the heat absorbing sections of the rest of the heat conducting strips are parallel to the lower inclined edge, and the heat dissipating sections connected with the heat absorbing sections parallel to the lower inclined edge and the heat dissipating sections connected with the heat absorbing sections parallel to the upper inclined edge are sequentially staggered along the circumferential direction of the supporting ring, and the heat absorbing sections parallel to the lower inclined edge are positioned between the heat absorbing sections parallel to the upper inclined edge.

According to a second aspect of the application, there is provided a rotor assembly comprising a main shaft, a rotor support, a rotor core, a rotor winding and the aforementioned heat dissipation member, wherein the rotor support is sleeved on the main shaft, the rotor core is sleeved on the rotor support, a winding groove is formed in one side of the rotor core, which is away from the main shaft, the rotor winding comprises a winding straight edge and a winding bevel edge group which are connected, the winding straight edge is arranged in the winding groove, the winding bevel edge group is positioned at one end of the rotor core, and a support ring is sleeved on the main shaft and positioned at one end of the rotor core, and the winding bevel edge group is thermally coupled with a heat absorption section.

According to a third aspect of the present application, there is provided an electric machine comprising a rotor assembly as hereinbefore described,

According to the heat dissipation piece provided by the embodiment of the application, the heat dissipation section is used for dissipating heat and reducing the temperature of the winding bevel edge of the rotor winding, so that the heat dissipation mode of the winding bevel edge is more direct and rapid on the basis of solving the problems of corona discharge at the end part of the winding, heat dissipation and the like, the gap between two adjacent winding bevel edges can be reduced, and the purpose of reducing the length of the end part of the winding is further realized. Therefore, the leakage reactance of the end part and the heating value of the winding end part can be reduced, so that the running performance of the motor can be improved, the weight of the winding end part can be reduced, the moment of the winding end part during the working of the motor can be reduced, the mechanical strength of the motor can be improved, and meanwhile, the winding end part can be supported by the heat conducting strip, so that the position stability of the winding end part can be improved, and the synchronism between the rotor winding and the main shaft can be ensured. Finally, the reliability of the motor can be improved.

Additional features and advantages of the application will be set forth in the detailed description which follows.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the description of the embodiments will be briefly described below. It is evident that the drawings in the following description are only some embodiments of the application and that other drawings may be obtained from these drawings without inventive effort for a person skilled in the art.

For a more complete understanding of the present application and the advantages thereof, reference is now made to the following descriptions taken in conjunction with the accompanying drawings, in which like reference numerals represent like parts throughout the following description.

FIG. 1 is a schematic view of a rotor winding in accordance with the related art mated with a rotor core;

FIG. 2 is a schematic view of a partial structure of a rotor winding in the related art;

FIG. 3 is a schematic diagram of the matching of a plurality of winding bevel groups according to the related art;

FIG. 4 is a schematic structural view of a heat sink provided in an exemplary embodiment of the present disclosure;

FIG. 5 is a schematic illustration of a support ring mated with a heat conductive strip provided in an exemplary embodiment of the present disclosure;

FIG. 6 is a schematic diagram of a heat sink mated with a winding bevel group provided in an exemplary embodiment of the present disclosure;

FIG. 7 is a schematic view of a heat conducting strip provided in an exemplary embodiment of the present disclosure;

FIG. 8 is a side view of a heat conducting strip provided in an exemplary embodiment of the present disclosure;

FIG. 9 is a schematic cross-sectional view of A-A-A of FIG. 8;

fig. 10 is a diagram of a comparison of a gap between winding oblique sides in the related art and a gap between winding oblique sides of a heat sink provided in an exemplary embodiment of the present disclosure;

FIG. 11 is a cross-sectional view of B-B in FIG. 5;

fig. 12 is a partial structural schematic diagram of a rotor assembly provided in an exemplary embodiment of the present disclosure.

Reference numerals illustrate:

1-rotor assembly, 11-rotor winding, 111-winding straight edge, 112-winding end, 113-winding bevel edge, 114-upper bevel edge, 115-lower bevel edge, 116-bevel edge gap;

12-rotor core, 121-winding groove, 13-main shaft, 14-rotor bracket, 15-guard ring and 16-profiling material;

2-heat dissipation piece, 21-supporting ring, 211-clamping groove, 212-boss and 213-weight reduction groove;

22-heat conducting strips;

221-heat-dissipation section, 221 a-upper heat-dissipation section, 221 b-lower heat-dissipation section;

222-heat absorbing section, 222 a-upper heat absorbing part, 222 b-lower heat absorbing part;

223-heat dissipation runner, 224-first sub runner, 225-second sub runner, 226-first stepped groove;

23-threaded holes, 24-threaded end sockets, 25-compression rings and 26-first screws.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. It will be apparent that the described embodiments are only some, but not all, embodiments of the application. All other embodiments, which can be made by a person skilled in the art without any inventive effort, are intended to be within the scope of the present application based on the embodiments of the present application.

Before describing a heat sink 2, a rotor assembly 1 and a motor according to an embodiment of the present application, a description will be given of related art of the present application.

As shown in fig. 1, fig. 1 is a schematic view of a rotor winding 11 and a rotor core 12 in the related art. In fig. 1, a portion of the rotor core 12 and a portion of the rotor winding 11 are selected for illustration for clarity of illustration of the mating structure. In the related art, a rotor winding 11 is wound around a rotor core 12. The rotor core 12 is provided with a plurality of winding grooves 121 formed at intervals in the circumferential direction. The winding groove 121 extends in the axial direction of the main shaft 13 of the motor. The rotor winding 11 includes a winding straight edge 111 provided in a winding groove 121 and a winding end 112 at one end of the rotor core 12. The winding end 112 includes two winding bevels 113. The two winding oblique sides 113 are an upper layer oblique side 114 obliquely arranged in the first direction and a lower layer oblique side 115 obliquely arranged in the second direction, respectively. One end of one winding straight edge 111 is connected to one end of the other winding straight edge 111 sequentially through an upper layer inclined edge 114 and a lower layer inclined edge 115, as shown in fig. 2, fig. 2 is a schematic view of a partial structure of a rotor winding 11 in the related art. The rotor winding 11 is wound in sequence along the circumferential direction of the rotor core 12 such that the upper-layer hypotenuses 114 of the plurality of winding hypotenuses are disposed adjacently and the lower-layer hypotenuses 115 of the plurality of winding hypotenuses are disposed adjacently, as shown in fig. 3, fig. 3 is a schematic diagram of the cooperation of the plurality of winding hypotenuses in the related art. The gap between adjacent two winding bevels 113 is a bevel gap 116.

In order to solve the problems of corona discharge, structural support, ventilation and heat dissipation of the rotor winding 11, the related art adopts a method of increasing the gap between two adjacent winding oblique sides 113, so that the rotor winding 11 increases the air flow flux between two adjacent winding oblique sides 113 on the basis of satisfying the electrical safety distance, thereby facilitating the improvement of the heat dissipation efficiency of the rotor winding 11. While increasing the gap between adjacent two of the winding-side edges 113 increases the length of the winding end 112, i.e., increases the length of the winding-side edge 113. As such, the reliability of the motor is poor. This is mainly manifested in the following aspects.

1. The increased length of the winding end 112 results in increased leakage reactance at the end of the rotor winding 11, which can adversely affect the motor's performance (e.g., starting characteristics, short circuit current times, overload capability, stability, etc.);

2. Since the winding end 112 is positioned at one end of the rotor core 12, the winding end 112 lacks support, so that the winding inclined edge 113 is easily deviated from a preset position due to centrifugal force and mechanical strength of the motor is reduced;

3. The increased length of the winding end 112 results in an increased heat generation of the rotor winding 11, which increases the heat dissipation requirement of the motor.

Based on this, the embodiment of the application provides a heat sink 2, a rotor assembly 1 and a motor, which can improve the heat dissipation efficiency of the winding bevel edges 113, and can reduce the interval between the winding bevel edges 113, so as to reduce the length of the winding end 112, thereby improving the reliability of the motor.

A heat sink 2 and a motor according to an embodiment of the present application are described in detail below with reference to fig. 4 to 12.

Referring to fig. 4 and 5, fig. 4 is a schematic structural view of a heat sink 2 provided in an exemplary embodiment of the present disclosure, and fig. 5 is a schematic view of a support ring 21 and a heat conductive strip 22 provided in an exemplary embodiment of the present disclosure. In a first aspect, embodiments of the present application provide a heat sink 2. The heat sink 2 comprises a support ring 21 and a heat conducting strip 22. The heat conducting strip 22 comprises a heat dissipating section 221 and a heat absorbing section 222 connected. The heat dissipation section 221 is connected to an end surface of the support ring 21, and the heat absorption section 222 is located on an outer peripheral side of the support ring 21. The heat conductive strips 22 are plural. The plurality of heat conductive strips 22 are disposed in sequence along the circumferential direction of the support ring 21. Wherein the heat absorbing segment 222 is parallel to the upper hypotenuse 114 of the rotor winding 11, or the heat absorbing segment 222 is parallel to the lower hypotenuse 115 of the rotor winding 11, or the heat absorbing segment 222 of a portion of the heat conducting strip 22 is parallel to the upper hypotenuse 114, and the heat absorbing segment 222 of the remaining portion of the heat conducting strip 22 is parallel to the lower hypotenuse 115. That is, the heat absorbing section 222 extends in a first direction, or the heat absorbing section 222 extends in a second direction, or a portion of the heat absorbing section 222 of the heat conductive strip 22 extends in the first direction, and the remaining portion of the heat absorbing section 222 of the heat conductive strip 22 extends in the second direction, as shown in fig. 5.

It will be appreciated that, for the sake of clarity in illustrating the structure of the heat sink 2, fig. 4 illustrates a portion of the support ring 21 and a plurality of heat conductive strips 22, and fig. 5 illustrates a portion of the support ring 21 and a heat conductive strip 22.

It will be appreciated that the support ring 21 is sleeved on the spindle 13 of the motor. The support ring 21 may be directly connected to the main shaft 13 or may be connected to the main shaft 13 by other means. The support ring 21 serves as a support for the heat sink 2, which stably fixes the heat conductive strips 22 to the main shaft 13.

It will be appreciated that the heat dissipation segment 221 may be adhered to the support ring 21, may be fixed to the support ring 21 by a screw or the like, or may be clamped to the support ring 21.

Specifically, the heat dissipation segment 221 is located on an end surface of the support ring 21 facing away from the rotor core 12. In this manner, the thermally conductive strip 22 may be mounted in the axial direction of the motor to facilitate control of the radial dimension of the motor.

It will be appreciated that the winding bevel 113 of the rotor winding 11 is thermally coupled to the heat absorbing section 222 to absorb heat of the winding bevel 113 through the heat absorbing section 222, as shown in fig. 6, fig. 6 is a schematic diagram of the heat sink 2 mated with several winding bevel groups provided in an exemplary embodiment of the present disclosure. The heat absorbing section 222 is located between the winding bevel edges 113, and absorbs heat to be the hot end of the heat conducting strip 22. After the heat absorption section 222 absorbs heat, the heat may be transferred to the heat dissipation section 221. The heat dissipation section 221 is located at one end of the winding bevel 113, and dissipates heat outwards, and is a cold end. The heat of the heat dissipation section 221 is taken away by the ventilation system of the motor through air convection to dissipate heat and cool the rotor winding 11.

Wherein thermal coupling refers to the manner in which heat transfer between two different components is achieved by contact. The heat absorbing section 222 may be connected to the winding bevel 113 by applying a heat conducting adhesive, or may be connected to the winding bevel 113 by pouring a glue.

It will be appreciated that the heat sink segment 222 is thermally coupled to the upper hypotenuse 114 when the heat sink segment 222 is parallel to the direction of extension of the upper hypotenuse 114 of the rotor winding 11. The heat absorbing section 222 is thermally coupled to the lower hypotenuse 115 when the heat absorbing section 222 is parallel to the extending direction of the lower hypotenuse 115 of the rotor winding 11.

It is understood that the thermally conductive strip 22 is a non-magnetic thermally conductive material. For example, copper materials, aluminum materials, silver materials, carbon fibers, graphene, ceramic materials, and the like. The heat of the winding bevel edge 113 is absorbed by these heat conductive materials, and the rotor winding 11 is cooled. Meanwhile, a runner filled with heat exchange medium can be further arranged inside the heat conducting strip 22, so that heat of the winding bevel edge 113 can be quickly absorbed through the heat exchange medium, and heat dissipation efficiency is improved. Correspondingly, the heat exchange medium may be a phase change material. In this way, a large amount of heat can be absorbed by the phase transition process of the phase change material.

In this embodiment, the heat dissipation section 221 dissipates heat from the winding bevel edge 113 of the rotor winding 11, so that the heat dissipation mode of the winding bevel edge 113 can be more direct and rapid on the basis of solving the problems of corona discharge and heat dissipation of the winding end 112, and the like, thereby reducing the gap between two adjacent winding bevel edges 113 and further achieving the purpose of reducing the length of the winding end 112. In this way, the leakage reactance of the end part and the heating value of the winding end part 112 can be reduced, so that the operation performance of the motor can be improved, the weight of the winding end part 112 can be reduced, the moment of the winding end part 112 can be reduced when the motor works, the mechanical strength of the motor can be improved, and meanwhile, the winding end part 112 can be supported by the heat conducting strip 22, so that the position stability of the winding end part 112 can be improved, and the synchronism between the rotor winding 11 and the main shaft 13 can be ensured. Finally, the reliability of the motor can be improved.

Referring to fig. 7 to 9, fig. 7 is a schematic structural view of the heat conductive strip 22 provided in the exemplary embodiment of the present disclosure, fig. 8 is a side view of the heat conductive strip 22 provided in the exemplary embodiment of the present disclosure, and fig. 9 is a schematic sectional structural view of A-A in fig. 8. In some embodiments, the thermally conductive strip 22 has a heat dissipation runner 223. The heat dissipation flow channels 223 are connected end to end. A portion of the heat dissipation flow path 223 is provided in the heat dissipation section 221. Another portion is disposed at the heat absorbing stage 222. Wherein the heat dissipation flow channel 223 is used for filling heat exchange medium.

Wherein, the heat exchange medium is selected from substances with good heat transfer performance, corrosion resistance and coking resistance. For example, the heat exchange medium can be single-phase fluid medium such as deionized water, low-temperature heat conducting oil and the like, and also can be phase-change working medium with stable thermal performance.

It will be appreciated that the heat sink 222 is located between the beveled edges 113 of the winding, which is at a higher temperature. The heat dissipation section 221 is located at one end of the winding bevel 113, which is not in contact with the rotor winding 11, and which is at a low temperature. Thus, there is a temperature difference between the cold and hot ends. In this manner, a structural temperature differential is created across the thermally conductive strip 22. Driven by the structural temperature difference, the joule heat of the winding bevel edge 113 is sequentially transferred to the hot end and the cold end, and finally is carried away by the motor ventilation system through the convection of cold air on the surface of the heat dissipation section 221, so that the temperature of the winding bevel edge 113 is reduced.

When a rotor of a certain large-capacity variable-speed generator is rotated, the minimum value of the circumferential follow-up linear velocity of the heat conducting strip 22 is 80m/s, and the distance between the heat conducting strip 22 and the center of the rotary spindle is not less than 2m, as described below.

The minimum value of the acceleration of the inertial force (i.e., the centrifugal force of the rotating field) received by the heat exchange medium in the heat dissipation flow path 223 is:

In the inertial force field, the natural convection heat transfer intensity of the heat exchange medium is measured by the Grignard Gr, and the value is in direct proportion to the inertial acceleration:

(formula II);

Where β is the volumetric expansion coefficient of the fluid (in K ^-1), which represents the degree of change in fluid volume with temperature, reflecting the effect of temperature change on fluid density, and thus the intensity of natural convection.

Then, substituting the inertial acceleration a of the rotor rotation of the high-capacity variable speed generator motor obtained by the first formula into the second formula shows that the natural convection intensity of the heat exchange medium in the heat conducting strip 22 is at least 10 ² times of the natural convection intensity in the standard gravity field. Since the cold and hot ends of the heat conductive strip 22 have a radial position difference (the heat dissipation section 221 is located at the end face of the support ring 21, the heat absorption section 222 is located at the outer peripheral side of the support ring 21) and a temperature difference (the heat absorption section 222 is located between the winding oblique sides 113 and absorbs heat, the heat dissipation section 221 is located outside the winding oblique sides 113 and dissipates heat), and the heat dissipation flow channels 223 are connected end to end. Therefore, the heat exchange medium can rely on thermal buoyancy to establish spontaneous steady flow circulation, so that the heat transfer capability of the heat conducting strip 22 can be greatly improved.

Specifically, simulation analysis using fluid analysis software (e.g., ANSYS CFD, or ANSYS fluent) may result in the selection of deionized water as the heat transfer medium, the heat conductivity of the heat conductive strip 22 being approximately 4000W/m/K, which is 20 times that of the aluminum material as the heat conductive strip 22, and the selection of the heat transfer medium as the phase change working medium, which may increase to 6000W/m/K, which is 30 times that of the aluminum material as the heat conductive strip 22.

In addition, in the related art, in order to satisfy the cooling of the winding end 112, the hypotenuse gap 116 needs to be designed to be 5mm or more for the air passage width through which a sufficient amount of air flows. In this embodiment, the thickness of the boundary layer of the heat exchange medium is significantly smaller than that of air, and the width of the heat dissipation flow channel 223 is 1-2 mm, so that the heat dissipation requirement of the winding bevel edge 113 can be met. The wall thickness of the heat dissipation flow channel 223 is 0.5 mm-1 mm. Therefore, the required installation gap of the heat conducting strip 22 is 2-4 mm, as shown in fig. 10, fig. 10 is a diagram comparing the gap between the winding oblique sides 113 in the related art with the gap between the winding oblique sides 113 of the heat sink 2 provided in the exemplary embodiment of the present disclosure. In fig. 10, (a) shows a layout of the winding bevel edge 113 in the relevant pole, and (b) shows a layout of the winding bevel edge 113 of the heat sink 2 according to the embodiment of the application. On the basis of the consistency of the span L3 of the winding end 112, the bevel-edge gap 116 in the related art has a larger gap due to ventilation and heat dissipation requirements. Correspondingly, the length L1 of the winding oblique side 113 in the related art is large. In this embodiment, the hypotenuse gap 116 is small due to the placement of the heat sink 2. Correspondingly, the length L2 of the winding bevel edge 113 of the heat dissipation element 2 provided by the embodiment of the application is smaller.

Therefore, in the present embodiment, by providing the heat dissipation flow channel 223 capable of being filled with the heat exchange medium in the heat conduction strip 22, the heat conductivity of the heat conduction strip 22 can be improved, so as to improve the heat dissipation efficiency of the heat conduction strip 22. In this manner, the hypotenuse gap 116 may be reduced, thereby achieving the goal of reducing the length of the wire wrap end 112.

Referring to fig. 9, in some embodiments, the heat dissipation runner 223 includes two first sub-runners 224 and two second sub-runners 225. Two ends of the two first sub-flow passages 224 are respectively disposed at the heat dissipation section 221 and the heat absorption section 222. Two second sub-channels 225 are located between the two first sub-channels 224. Two ends of the two second sub-flow passages 225 are respectively disposed at the heat dissipation section 221 and the heat absorption section 222. Wherein the two first sub-channels 224 are located at the ends of the heat dissipation section 221 and are communicated with each other. The two second sub-channels 225 are located at the ends of the heat dissipation section 221 to communicate with each other. The ends of the two first sub-channels 224 at the heat absorbing section 222 are respectively communicated with the ends of the two second sub-channels 225 at the heat absorbing section 222. Thus, the heat exchange medium can flow in multiple layers inside the heat conducting strip 22, so as to facilitate improving the heat dissipation efficiency of the heat conducting strip 22.

Referring to fig. 9, in some embodiments, the heat conducting strip 22 is provided with a threaded hole 23. The screw hole 23 communicates with the heat dissipation flow path 223. The heat sink 2 further comprises a screw head 24, and the screw head 24 is in threaded connection with the threaded hole 23.

Specifically, the screw hole 23 is provided in the heat dissipation section 221. Illustratively, the threaded bore 23 is provided on an end face of the heat dissipating section 221 facing the spindle 13.

In this embodiment, by providing the threaded hole 23 and the threaded end socket 24, not only the heat exchange medium can be filled into the heat dissipation flow channel 223 through the threaded hole 23, but also the heat exchange medium can be effectively prevented from leaking, and the subsequent maintenance is facilitated.

Referring to fig. 4, in some embodiments, the heat sink 2 further includes a compression ring 25 and a first screw 26. The axis of the compression ring 25 is parallel to the axis of the support ring 21. The compression ring 25 is located on the side of the heat dissipation section 221 facing away from the support ring 21. The rod end of the first screw 26 passes through the clamp ring 25 and is screwed to the support ring 21. In this way, the heat dissipation section 221 can be fixed on the end surface of the support ring 21 by the compression ring 25, so as to facilitate improving the reliability of the connection between the support ring 21 and the heat conducting strip 22.

It will be appreciated that when the heat sink 2 comprises the second thermally conductive strip 22, the second section is located between the clamp ring 25 and the support ring 21. The second section is fixed to the end face of the support ring 21 by means of a compression ring 25.

Referring to fig. 5, in some embodiments, a plurality of clamping grooves 211 are provided on the support ring 21. One side of the heat dissipation section 221 is inserted into the clamping groove 211, and the other side is abutted against the compression ring 25.

It will be appreciated that the clamping groove 211 is a through groove structure that extends in the radial direction of the support ring 21.

It will be appreciated that the two side groove walls of the clamping groove 211 limit the movement of the heat conducting strip 22 in the circumferential direction of the support ring 21, and that the compression ring 25 and the support ring 21 in combination limit the movement of the heat conducting strip 22 in the radial direction of the support ring 21 and in the axial direction of the support ring 21.

In this embodiment, by providing the clamping groove 211, the heat conducting strip 22 can be detachably disposed on the supporting ring 21, so that not only the assembly efficiency of the heat dissipation element 2 can be improved, but also the maintenance convenience of the heat dissipation element 2 can be improved.

Referring to fig. 7 and 11, fig. 11 is a cross-sectional view of B-B of fig. 5. A first stepped groove 226 is provided at a side of the heat dissipation section 221 facing the compression ring 25. The inner circumferential surface of the clamp ring 25 abuts against one side groove wall of the first stepped groove 226. Therefore, the heat conducting strip 22 is in stop fit with the compression ring 25, so that the movement of the heat conducting strip 22 in the radial direction of the support ring 21 can be limited, and the position stability of the heat conducting strip 22 can be improved.

The inner ring surface of the compression ring 25 abuts against a side groove wall of the first step groove 226 to prevent the heat conducting strip 22 from moving outwards along the radial direction of the support ring 21, and the heat absorbing section 222 is located at the outer periphery of the support ring 21 to be in blocking fit with the support ring 21, so that the heat conducting strip 22 can be prevented from moving inwards along the radial direction of the support ring 21.

Referring to fig. 11, in some embodiments, the surface of the support ring 21 facing the heat dissipation section 221 is provided with a boss 212. A portion of the surface of the heat dissipation section 221 facing the support ring 21 is connected to the boss 212, and the remaining portion is spaced apart from the support ring 21. In this way, a ventilation passage may be formed between the heat dissipation section 221 and the support ring 21 to facilitate ventilation, so that the heat dissipation area of the heat dissipation section 221 may be increased. Thus, the heat dissipation efficiency of the heat conductive strips 22 can be improved.

Referring to fig. 5 or 11, in some embodiments, a weight-reducing groove 213 is provided on the inner circumferential surface of the support ring 21. The weight-reducing grooves 213 extend in the circumferential direction of the support ring 21. In this way, the material used for the support ring 21 can be reduced by two, so that the weight of the support ring 21 can be reduced, and the weight of the motor can be controlled.

Referring to fig. 4 or 5, in some embodiments, a portion of the heat sink segments 222 of the heat conductive strips 22 are parallel to the upper beveled edge 114 and the remaining portion of the heat sink segments 222 of the heat conductive strips 22 are parallel to the lower beveled edge 115. The heat dissipation segments 221 connected to the heat absorption segments 222 parallel to the lower inclined edge 115 and the heat dissipation segments 221 connected to the heat absorption segments 222 parallel to the upper inclined edge 114 are sequentially staggered along the circumferential direction of the supporting ring 21. The heat sink segments 222 parallel to the lower hypotenuse 115 are located between the heat sink segments 222 parallel to the upper hypotenuse 114.

Specifically, the heat absorbing section 222 parallel to the upper oblique side 114 is defined as an upper heat absorbing portion 222a, the heat absorbing section 222 parallel to the lower oblique side 115 is defined as a lower heat absorbing portion 222b, the heat dissipating section 221 connected to the upper heat absorbing portion 222a is defined as an upper heat dissipating section 221a, and the heat dissipating section 221 connected to the lower heat absorbing portion 222b is defined as a lower heat dissipating section 221b. The upper layer heat conducting parts are sequentially and alternately arranged along the circumferential direction of the supporting ring 21, the upper layer inclined edges 114 and the upper layer heat conducting parts are alternately distributed along the circumferential direction of the supporting ring 21, each upper layer inclined edge 114 is thermally coupled with the corresponding upper layer heat conducting part, the lower layer heat conducting parts are sequentially and alternately arranged along the circumferential direction of the supporting ring 21, the lower layer inclined edges 115 and the lower layer heat conducting parts are alternately distributed along the circumferential direction of the supporting ring 21, each lower layer inclined edge 115 is thermally coupled with the corresponding lower layer heat conducting part, and the upper layer heat dissipation sections 221a and the lower layer heat dissipation sections 221b are sequentially and alternately arranged along the circumferential direction of the supporting ring 21, as shown in fig. 6.

In this embodiment, through the above arrangement, the upper layer oblique side 114 and the lower layer oblique side 115 can isolate the air medium through the upper layer heat absorbing portion 222a and the lower layer heat absorbing portion 222b, respectively, so as to facilitate improving the heat dissipation efficiency of the rotor winding 11.

Referring to fig. 12, fig. 12 is a partial structural schematic view of a rotor assembly 1 provided in an exemplary embodiment of the present disclosure. In a second aspect, an embodiment of the application provides a rotor assembly 1. The rotor assembly 1 includes a main shaft 13, a rotor bracket 14, a rotor core 12, a rotor winding 11, and the aforementioned heat sink 2. The rotor bracket 14 is sleeved on the main shaft 13. Rotor core 12 is sleeved on rotor bracket 14. A winding slot 121 is provided on the side of the rotor core 12 facing away from the main shaft 13. The rotor winding 11 includes connected winding straight sides 111 and winding bevel groups. The winding straight edge 111 is disposed in the winding slot 121. The winding hypotenuse group is located at one end of the rotor core 12. The support ring 21 is sleeved on the main shaft 13 and is positioned at one end of the rotor core 12. The winding hypotenuse group is thermally coupled to the heat absorbing segment 222.

It will be appreciated that the rotor assembly 1 includes the heat sink 2 described above. The rotor assembly 1 has all the advantages of the heat sink 2 described above, and the disclosure is not repeated here.

Specifically, the heat conducting strip 22 is attached to the winding end 112, that is, each upper inclined edge 114 is attached to the corresponding upper heat conducting portion, and each lower inclined edge 115 is attached to the corresponding lower heat conducting portion. And, one side of each upper layer bevel 114 is attached to the corresponding upper layer heat conducting part, and the other side is abutted to the other upper layer heat conducting part adjacent to the upper layer bevel through the conformal material. Meanwhile, the gaps can be filled with pouring sealant to eliminate the joint surface gaps between the heat conducting strips 22 and the winding bevel edges 113. And the rotor core 12, the rotor winding 11, and the heat sink 2 are cured as one body.

Wherein the rotor assembly 1 further comprises a grommet 15. The guard ring 15 is wound around the winding bevel 113. The winding bevel 113 is located between the grommet 15 and the support ring 21. Thus, and the limit winding bevel 113 is supported by the guard ring 15 and the support ring 21, it is prevented from deviating from the preset position due to the centrifugal force.

In a third aspect, an embodiment of the application provides an electric machine comprising a rotor assembly 1 as described above.

It is understood that the motor further includes a housing and a stator assembly. The rotor assembly 1 is arranged in a housing, and the main shaft 13 is in rotary fit with the housing through a bearing. The stator assembly is fixed in the shell and sleeved outside the rotor assembly 1. There is a mating air gap between the stator assembly and the rotor assembly 1.

It will be appreciated that the motor comprises a rotor assembly 1 as described above. This motor has all the advantages of the above-mentioned rotor assembly 1, and this disclosure is not repeated here.

In the description of the present application, 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 or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more features. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the foregoing embodiments, the descriptions of the embodiments are emphasized, and for parts of one embodiment that are not described in detail, reference may be made to related descriptions of other embodiments.

The embodiments, the implementation modes and the related technical features of the application can be mutually combined and replaced under the condition of no conflict.

The foregoing is only a preferred embodiment of the present application, and is not intended to limit the present application in any way, but any simple modification, equivalent variation and modification made to the above embodiment according to the technical matter of the present application still fall within the scope of the technical solution of the present application.

Claims

1. A heat sink (2), characterized by comprising:

a support ring (21)

The heat conducting strip (22) comprises a heat dissipation section (221) and a heat absorption section (222) which are connected, the heat dissipation section (221) is connected with the end face of the support ring (21), and the heat absorption section (222) is positioned on the outer periphery side of the support ring (21);

The heat conducting strips (22) are multiple, and the heat conducting strips (22) are sequentially arranged along the circumferential direction of the supporting ring (21);

wherein the heat absorbing section (222) is parallel to an upper layer bevel (114) of the rotor winding (11), or the heat absorbing section (222) is parallel to a lower layer bevel (115) of the rotor winding (11), or a part of the heat absorbing section (222) of the heat conducting strip (22) is parallel to the upper layer bevel (114), and the rest of the heat absorbing section (222) of the heat conducting strip (22) is parallel to the lower layer bevel (115).

2. The heat sink (2) according to claim 1, wherein the heat conducting strip (22) has a heat dissipating flow channel (223), a part of the heat dissipating flow channel (223) being arranged at the heat dissipating section (221) and another part being arranged at the heat absorbing section (222);

wherein the heat dissipation runner (223) is used for filling heat exchange medium.

3. The heat dissipation element (2) according to claim 2, wherein the heat dissipation flow channel (223) comprises two first sub flow channels (224) and two second sub flow channels (225), two ends of the two first sub flow channels (224) are respectively arranged at the heat dissipation section (221) and the heat absorption section (222), the two second sub flow channels (225) are positioned between the two first sub flow channels (224), and two ends of the two second sub flow channels (225) are respectively arranged at the heat dissipation section (221) and the heat absorption section (222), wherein the two first sub flow channels (224) are positioned at the end parts of the heat dissipation section (221) and the two second sub flow channels (225) are positioned at the end parts of the heat dissipation section (221) and are mutually communicated, and the two ends of the two first sub flow channels (224) and the two second sub flow channels (225) are respectively positioned at the end parts of the heat absorption section (222);

And/or be provided with screw hole (23) on heat conduction strip (22), screw hole (23) with heat dissipation runner (223) intercommunication, heat dissipation piece (2) still include screw thread head (24), screw thread head (24) with screw hole (23) threaded connection.

4. The heat sink (2) according to claim 1, wherein the heat sink (2) further comprises a compression ring (25) and a first screw (26), the axis of the compression ring (25) is parallel to the axis of the support ring (21), the compression ring (25) is located at a side of the heat sink section (221) facing away from the support ring (21), and a rod end of the first screw (26) is threaded with the support ring (21) after passing through the compression ring (25).

5. The heat sink (2) according to claim 4, wherein a plurality of clamping grooves (211) are provided on the support ring (21), one side of the heat sink section (221) is inserted into the clamping groove (211), and the other side is abutted against the compression ring (25).

6. The heat sink (2) according to claim 4, characterized in that a first stepped groove (226) is provided on a side of the heat dissipation section (221) facing the compression ring (25), and an inner circumferential surface of the compression ring (25) abuts against a side groove wall of the first stepped groove (226).

7. The heat sink (2) according to any of the claims 1-6, characterized in that the surface of the support ring (21) facing the heat sink section (221) is convexly provided with a boss (212), a part of the surface of the heat sink section (221) facing the support ring (21) being connected to the boss (212), the remaining part being arranged at a distance from the support ring (21);

And/or a weight-reducing groove (213) is arranged on the inner annular surface of the support ring (21), and the weight-reducing groove (213) extends along the circumferential direction of the support ring (21).

8. The heat sink (2) according to any one of claims 1-6, wherein a part of the heat absorbing section (222) of the heat conducting strip (22) is parallel to the upper hypotenuse (114), and the rest of the heat absorbing section (222) of the heat conducting strip (22) is parallel to the lower hypotenuse (115);

Wherein, along the circumference of the supporting ring (21), the heat dissipation sections (221) connected with the heat absorption sections (222) parallel to the lower-layer inclined edge (115) and the heat dissipation sections (221) connected with the heat absorption sections (222) parallel to the upper-layer inclined edge (114) are sequentially staggered, and the heat absorption sections (222) parallel to the lower-layer inclined edge (115) are positioned between the heat absorption sections (222) parallel to the upper-layer inclined edge (114).

9. A rotor assembly (1), characterized by comprising

A main shaft (13);

a rotor bracket (14) sleeved on the main shaft (13);

The rotor core (12) is sleeved on the rotor bracket (14), and a winding groove (121) is formed in one side, away from the main shaft (13), of the rotor core (12);

A rotor winding (11) comprising a winding straight edge (111) and a winding bevel edge group which are connected, wherein the winding straight edge (111) is arranged in the winding groove (121), the winding bevel edge group is positioned at one end of the rotor core (12), and

The heat sink (2) according to any of claims 1-8, wherein the support ring (21) is sleeved on the main shaft (13) and is located at one end of the rotor core (12), and the winding bevel group is thermally coupled to the heat absorbing section (222).

10. An electric machine, characterized by comprising a rotor assembly (1) as claimed in claim 9.