Motor stator assembly

Abstract

The invention discloses a motor stator assembly, and belongs to the field of motors. The motor stator assembly comprises a stator, a casing, a heat conduction member and a radiator. The stator comprises a stator core and a stator winding; the casing comprises a body and a plurality of radiating fins, the stator is sleeved with the body, and the radiating fins are arranged on the outer side of the body; the heat conduction piece penetrates through the body and is located at the end part of the stator iron core, and the stator winding is wound outside the heat conduction piece and the stator iron core; the radiator is connected with the part, located outside the machine shell, of the heat conduction piece. Through the arrangement of the heat conduction piece and the radiator, the axial temperature gradient of the stator winding can be reduced, and the heat dissipation effect on the end part of the stator winding is improved.

Description

Technical Field

[0001] The present application belongs to the field of motor technology, and in particular, relates to a motor stator assembly. Background Art

[0002] The stator winding of the motor stator assembly will generate a large amount of heat when powered on. If this heat cannot be dissipated in time, it will cause the local temperature of the motor to be too high, thereby affecting the performance and life of the motor, and may even cause safety accidents. Summary of the invention

[0003] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes a motor stator assembly, which is used to effectively dissipate heat from the ends of the stator windings and improve the stability of the motor.

[0004] The present application provides a motor stator assembly, comprising:

[0005] A stator, comprising a stator core and a stator winding;

[0006] The casing comprises a body and a plurality of heat dissipation fins, wherein the body is sleeved on the outside of the stator, and the heat dissipation fins are arranged on the outside of the body;

[0007] A heat conducting member, the heat conducting member is passed through the body and is located at an end of the stator core, and the stator winding is wound around the heat conducting member and the outside of the stator core;

[0008] A heat sink is connected to the portion of the heat conducting member located outside the housing.

[0009] According to the motor stator assembly of the present application, a heat conductor and a heat sink are provided, and the heat conductor is located at the inner end of the stator winding, which does not affect the position of the lead wire reserved at the outer end of the stator winding. Therefore, the heat conductor can be provided at both axial ends of the stator winding, which can reduce the axial temperature gradient of the stator winding and improve the thermal safety factor of the motor stator assembly; at the same time, the end face heat exchange area between the heat conductor and the stator winding can be increased, thereby improving the heat dissipation effect on the end of the stator winding.

[0010] According to one embodiment of the present application, the stator core includes a plurality of stator teeth, which are spaced apart and distributed around the circumference of the stator core, the heat conductor is located at the end of the stator teeth, and the stator winding is wound around the heat conductor and outside the stator teeth.

[0011] According to an embodiment of the present application, portions of the heat sink and the heat conductor located outside the housing do not protrude beyond the heat dissipation fins in the radial direction of the body.

[0012] According to an embodiment of the present application, the heat sink includes a plurality of heat sinks, and the plurality of heat sinks are stacked and spaced apart along the axial direction of the heat conducting member.

[0013] According to an embodiment of the present application, a plurality of heat sinks are sleeved on the heat conductive member, and a heat conductive layer is provided between the heat sink and the heat conductive member.

[0014] According to an embodiment of the present application, the heat dissipation fins distributed on both sides of the heat sink along the circumference of the body are spaced apart from the heat sink.

[0015] According to an embodiment of the present application, the shortest distance between the heat sink and the heat sink distributed on both sides of the heat sink along the circumference of the body is monotonically non-decreasing along the direction from close to the body to far away from the body.

[0016] According to one embodiment of the present application, the plurality of heat dissipating fins include a plurality of first fins and a plurality of second fins, the first fins extend from one end of the body to the other end along the axial direction, the length of the second fins along the axial direction is shorter than the length of the first fins along the axial direction, at least one second fin is arranged between two adjacent first fins, the radiator is arranged between two adjacent first fins, and the radiator is arranged at the end of the second fin along the axial direction.

[0017] According to an embodiment of the present application, the heat sink and the first fin are spaced apart from each other, and the heat sink and the second fin are in contact and connected.

[0018] According to an embodiment of the present application, the motor stator assembly further includes a fixing member, and the fixing member is disposed between the heat conducting member and the housing.

[0019] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0021] Figure 1 It is one of the structural schematic diagrams of the motor stator assembly provided in the embodiment of the present application;

[0022] Figure 2 This is the second structural schematic diagram of the motor stator assembly provided in the embodiment of the present application;

[0023] Figure 3 This is the third structural schematic diagram of the motor stator assembly provided in the embodiment of the present application;

[0024] Figure 4 This is the fourth structural schematic diagram of the motor stator assembly provided in the embodiment of the present application;

[0025] Figure 5 This is the fifth structural schematic diagram of the motor stator assembly provided in the embodiment of the present application;

[0026] Figure 6 This is the sixth structural schematic diagram of the motor stator assembly provided in the embodiment of the present application;

[0027] Figure 7 This is the seventh structural schematic diagram of the motor stator assembly provided in the embodiment of the present application;

[0028] Figure 8 This is the eighth structural schematic diagram of the motor stator assembly provided in the embodiment of the present application;

[0029] Fig. 9 This is the ninth structural schematic diagram of the motor stator assembly provided in the embodiment of the present application;

[0030] Fig.10 This is the tenth structural schematic diagram of the motor stator assembly provided in the embodiment of the present application;

[0031] Fig.11 This is the eleventh structural diagram of the motor stator assembly provided in the embodiment of the present application;

[0032] Fig.12 This is the twelfth structural schematic diagram of the motor stator assembly provided in the embodiment of the present application.

[0033] Reference numerals:

[0034] Stator core 1, stator tooth 11, tooth shoe 111, tooth top 112, stator yoke 12, stator tooth slot 13, stator winding 2, coil 21, conductor 211, heat conductor 3, radiator 4, plug hole 41, casing 5, body 51, mounting hole 511, heat dissipation fin 52, first fin 521, second fin 522. DETAILED DESCRIPTION

[0035] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0036] Reference below Figure 1-Figure 12Describe the motor stator assembly according to the embodiment of the present application. The motor stator assembly according to the embodiment of the present application can be used in distributed power generation systems, flywheel energy storage systems, aerospace, high-speed grinders, hybrid vehicles, ships, textiles, centrifugal compressors of air conditioners or refrigerators, as well as in military fields such as military vehicles, tanks, aircraft, land and sea defense, and mobile power supply.

[0037] like Figure 1 and Fig.11 As shown, the motor stator assembly includes: a stator, a heat conductor 3 and a heat sink 4.

[0038] like Figure 4 As shown, the stator includes a stator core 1 and a stator winding 2. The heat conductor 3 is located at the end of the stator core 1, and the stator winding 2 is wound around the heat conductor 3 and the outside of the stator core 1.

[0039] like Figure 2 As shown, the stator winding 2 includes a plurality of coils 21, and the plurality of coils 21 corresponding to the same pole are arranged along the circumference of the stator core 1, and the coil 21 includes a conductor 211, and the conductor 211 is wound around the heat conductor 3 and the outside of the stator core 1. A plurality refers to two or more.

[0040] like Figure 5 As shown, one coil 21 has two ends along the axial direction, and the heat-conducting member 3 is located at at least one end along the axial direction of the coil 21. Multiple coils 21 correspond to multiple heat-conducting members 3.

[0041] The stator core 1 can be made of high-quality silicon steel sheets to reduce eddy current loss and iron loss and improve the energy efficiency of the motor. The stator winding 2 can be wound with a conductor 211 with high conductivity, and the conductor 211 can be made of copper wire or aluminum wire. The stator winding 2 is evenly arranged around the stator core 1 and the heat conductor 3 to achieve current distribution and reduce the generation of hot spots.

[0042] The heat conductor 3 is located at the end of the stator core 1 , and the stator winding 2 is wound around the heat conductor 3 . The heat conductor 3 mainly serves as a heat conduction bridge between the stator winding 2 and the heat sink 4 .

[0043] The heat dissipation area of ​​the heat conductive member 3 and the stator winding 2 is determined by parameters such as the thickness of the stator winding 2 in the radial direction and the outer diameter of the heat conductive member 3 .

[0044] In the related art, a heat dissipation device such as a heat conductor 3 or a radiator 4 is located at the outer end of the stator winding 2. The outer end of the stator winding 2 is in contact with the heat dissipation device, making it difficult to achieve a good fit between the heat dissipation device and the stator winding 2. The heat exchange area is small, the heat dissipation effect is poor, and it affects the lead-out of the lead-out wires reserved at the outer end of the stator winding 2.

[0045] In the present application, the heat conductor 3 is arranged at the inner end of the stator winding 2. On the one hand, the heat conductor 3 located at the inner end is not affected by the lead wire of the stator winding 2. On the other hand, the way in which the stator winding 2 is wound around the heat conductor 3 can greatly increase the heat exchange area between the end of the stator winding 2 and the heat conductor 3, reduce the axial temperature gradient of the stator winding 2, and improve the thermal safety factor of the motor stator assembly.

[0046] In this embodiment, if Figure 5 As shown, the heat conductor 3 is embedded inside the end of the stator winding 2, which has no effect on the axial dimension of the end of the motor stator assembly, is beneficial to the control of the axial dimension of the motor stator assembly, and is beneficial to improving the power density of the motor stator assembly.

[0047] The heat conductor 3 can be made of a material with high thermal conductivity. For example, the heat conductor 3 can be a copper member, an aluminum member or a copper-aluminum alloy member to improve the efficiency of transferring the heat generated by the stator winding 2 to the heat sink 4 and improve the heat dissipation effect.

[0048] In some embodiments, Figure 3 and Figure 5 As shown, the heat exchange surface where the heat conductor 3 contacts the inner end surface of the stator winding 2 is arc-shaped. Exemplarily, the heat conductor 3 can be a heat conducting rod, and the cross-section of the heat conducting rod can be circular, elliptical or irregular in shape to improve contact and increase the heat exchange area.

[0049] For example, the heat conductor 3 may be located at one end of the stator core 1 along the axial direction to dissipate heat from one end of the stator winding 2; or Figure 5 As shown, the heat conductor 3 can be located at the two axial ends of the stator core 1. The heat conductor 3 is not affected by the lead wires of the stator winding 2. At the same time, the heat is dissipated from the two ends of the stator winding 2, thereby reducing the axial temperature gradient of the stator winding 2 and improving the thermal safety factor of the motor stator assembly.

[0050] The heat sink 4 is connected to the heat conducting member 3 to dissipate the heat transferred from the heat conducting member 3 to the surrounding environment.

[0051] For example, the heat sink 4 may be a fin structure to increase the heat dissipation area and improve the heat dissipation efficiency. The shape, number and arrangement of the fins may be set according to actual installation and adjustment to ensure the maximum heat dissipation effect within a limited volume.

[0052] Exemplarily, the radiator 4 may also adopt cooling methods such as air cooling, water cooling or heat pipe to meet the cooling requirements of different application scenarios.

[0053] The heat sink 4 and the heat conducting element 3 can be connected by sleeve mounting, plugging, integral molding or snap-on connection.

[0054] Exemplarily, the heat conducting member 3 may be a heat conductor such as a heat pipe or a heat conducting metal.

[0055] In some embodiments, Figure 6 and Figure 7 As shown, the heat sink 4 includes a plurality of heat sinks 4 , which are stacked and spaced apart along the axial direction of the heat conducting member 3 .

[0056] The heat sink 4 is in the form of fins, and multiple heat sinks 4 are stacked at intervals to increase the heat dissipation area and improve the heat dissipation efficiency.

[0057] In this embodiment, if Figure 6 and Figure 7 As shown, the heat conductor 3 extends radially along the stator core 1, and multiple heat sinks 4 are arranged axially along the heat conductor 3, which can effectively utilize the axial space of the heat conductor 3 and increase the number of layers of the heat sink 4, so as to dissipate heat in different areas of the heat conductor 3 and improve the heat dissipation efficiency.

[0058] The number of layers and size of the heat sink 4 can be determined according to the power of the motor stator assembly, the parameters of the heat conductor 3 and the heat dissipation requirements of the stator winding 2 .

[0059] In some embodiments, Figure 6 and Figure 7 As shown, a plurality of heat sinks 4 are sleeved outside the heat conducting element 3 .

[0060] like Figure 8 As shown, the radiator 4 is provided with a plug hole 41, the inner diameter of the plug hole 41 is adapted to the outer diameter of the heat conductor 3, and the radiator 4 is connected to the heat conductor 3 through the plug hole 41, so that the radiator 4 can contact the circumferential side wall of the heat conductor 3, thereby increasing the heat exchange area between the radiator 4 and the heat conductor 3 and improving the heat dissipation effect.

[0061] The heat exchange area between the heat sink 4 and the heat conductor 3 is determined by the thickness of the heat sink 4 and the outer diameter of the heat conductor 3 .

[0062] The heat dissipation area of ​​the radiator 4 is determined by the area of ​​the radiator 4 .

[0063] In some embodiments, a thermal conductive layer is provided between the heat sink 4 and the thermal conductor 3. Exemplarily, the thermal conductive layer can be a high thermal conductive structure such as thermal conductive glue and graphite sleeve, thereby increasing the heat conduction between the heat sink 4 and the thermal conductor 3, and at the same time increasing the stability of the connection between the heat sink 4 and the thermal conductor 3.

[0064] In some embodiments, Figure 6 and Figure 7As shown, the end of the heat conductor 3 is an arc surface. Compared with the structure with a flat end surface, the sharpness of the side and end surface of the heat conductor 3 can be weakened, thereby protecting the conductor 211 of the stator winding 2, reducing the risk of the conductor 211 being cut and broken, and extending the service life; at the same time, if the end surface of the heat conductor 3 is arc-shaped, the heat dissipation area can be increased, and it can play a guiding role, which is convenient for one end of the heat conductor 3 to be assembled with the stator winding 2, and the other end of the heat conductor 3 to be assembled with the radiator 4.

[0065] In the related art, considering that the stator winding 2 requires at least one outer end to reserve a lead wire, a heat dissipation device such as a heat conductor 3 or a heat sink 4 can only be set at one of the outer ends of the stator winding 2. The end of the stator winding 2 where the heat conductor 3 is not installed has extremely poor heat dissipation, and a large temperature gradient may cause thermal risks to the motor stator assembly; and the heat conductor 3 is directly placed on the outer end surface of the stator winding 2. Since the contact area between the heat conductor 3 and the end of the stator winding 2 is limited, the heat dissipation efficiency is greatly reduced, thereby inhibiting the heat dissipation of the end of the stator winding 2.

[0066] According to the motor stator assembly provided in the embodiment of the present application, a heat conductor 3 and a heat sink 4 are provided. The heat conductor 3 is located at the inner end of the stator winding 2. On the one hand, it does not affect the position of the lead-out wires reserved at the outer end of the stator winding 2, so that the heat conductor 3 can be provided at both axial ends of the stator winding 2, which can reduce the axial temperature gradient of the stator winding 2 and improve the thermal safety factor of the motor stator assembly; on the other hand, the heat exchange area between the heat conductor 3 and the end face of the stator winding 2 can be increased, thereby improving the heat dissipation effect on the end of the stator winding 2.

[0067] In some embodiments, Fig. 9 As shown, the stator core 1 includes a plurality of stator teeth 11 , which are spaced apart and distributed around the circumference of the stator core 1 , the heat conductor 3 is located at the end of the stator teeth 11 , and the stator winding 2 is wound around the heat conductor 3 and the outside of the stator teeth 11 .

[0068] The plurality of heat conducting members 3 and one ends of the plurality of stator teeth 11 are arranged in one-to-one correspondence, and a heat conducting member 3 is arranged at one end of each stator tooth 11 or at both ends of each stator tooth 11 .

[0069] In this embodiment, if Fig. 9As shown, the stator core 1 includes a stator yoke 12 and a stator tooth 11, wherein the stator yoke 12 is annular, and there are multiple stator teeth 11, which are distributed along the circumference of the stator yoke 12 and arranged at intervals, and the multiple stator teeth 11 are arranged on the inner circumference of the stator yoke 12 for use in an inner rotor motor. In other words, the outer ends of the stator teeth 11 along the radial direction of the stator core 1 are connected to the inner circumference of the stator yoke 12. Alternatively, the multiple stator teeth 11 are arranged on the outer circumference of the stator yoke 12 for use in an outer rotor motor. In other words, the inner ends of the stator teeth 11 along the radial direction of the stator core 1 are connected to the outer circumference of the stator yoke 12. A stator tooth slot 13 is formed between two adjacent stator teeth 11.

[0070] The stator yoke 12 can provide mechanical support for the plurality of stator teeth 11 so as to fix the positions of the stator teeth 11. In some embodiments, the stator teeth 11 can be integrally formed with the stator yoke 12.

[0071] In this embodiment, if Figure 3 As shown, the heat conductor 3 is located at the end of the stator tooth 11 along the axial direction, and the heat conductor 3 and the stator tooth 11 are located on the same line along the axial direction, that is, the heat conductor 3 and the stator tooth 11 together form the winding axis of the stator winding 2, and the stator winding 2 is evenly wound around the periphery of the heat conductor 3 and the stator tooth 11 to increase the contact between the stator winding 2 and the heat conductor 3, and further improve the heat conduction efficiency.

[0072] The shape and size of the heat conducting member 3 match the end of the stator tooth 11 , so that the heat conducting member 3 , the stator tooth 11 and the stator winding 2 are in close contact, thereby reducing thermal resistance.

[0073] Exemplarily, the width of the heat conducting element 3 along the circumferential direction is not greater than the width of the stator tooth 11 along the circumferential direction.

[0074] In some embodiments, the end of the stator tooth 11 away from the stator yoke 12 is a tooth top 112 .

[0075] The end of the stator tooth portion 11 away from the stator yoke portion 12 has a tooth shoe 111 , and the surface of the tooth shoe 111 facing away from the stator yoke portion 12 is formed as a tooth top 112 to have a limiting effect on the in-slot conductor 211 .

[0076] In some embodiments, the motor stator assembly of the present application can be applied to motors with various coil element spans. For example, it can be applied to motors with short-pitch windings, long-pitch windings, or full-pitch windings.

[0077] Exemplarily, the span N of the motor stator assembly satisfies: 1≤N≤6, and the span N represents the number of stator tooth slots 13 spanned between two effective sides of each coil in the stator winding. For example, N can be 1, 3, 5 or 6, and the specific span can be set according to the application scenario of the motor stator assembly.

[0078] When the span N=1, the number of stator tooth slots 13 occupied by the two effective sides of each coil in the stator winding is 1, such as Figure 2 and Fig.11 As shown; when the span N=2, the number of stator tooth slots 13 occupied by the two element sides of each coil in the stator winding is 2; when the span N=4, the number of stator tooth slots 13 occupied by the two element sides of each coil in the stator winding is 4.

[0079] In some embodiments, Figure 1 and Fig.11 As shown, the motor also includes a casing 5, the casing 5 is sleeved on the outside of the stator, the heat conductor 3 is passed through the casing 5, the heat sink 4 is connected to the part of the heat conductor 3 located outside the casing 5, and the stator winding 2 is wound around the part of the heat conductor 3 located inside the casing 5.

[0080] The housing 5 is sleeved on the outside of the stator to fix the stator, protect the internal components of the motor stator assembly and isolate the external environment.

[0081] The heat conductor 3 is inserted into the housing 5, one end of the heat conductor 3 is located inside the housing 5 and is in close contact with the stator winding 2; the other end of the heat conductor 3 is located outside the housing 5 and is connected to the radiator 4. The heat conductor 3 is used to conduct the heat of the stator winding 2 inside the housing 5 to the outside of the housing 5, and dissipate the heat to the external environment through the radiator 4, thereby dissipating the heat from the end of the stator winding 2, reducing the axial temperature gradient of the stator winding 2, and improving the thermal safety factor of the motor stator assembly.

[0082] In some embodiments, the radiator 4 may also be equipped with auxiliary heat dissipation equipment such as a fan to further enhance the heat dissipation effect.

[0083] In some embodiments, Fig.10 and Fig.12 As shown, the housing 5 includes a body 51 and a plurality of heat dissipation fins 52 .

[0084] The body 51 is sleeved on the outside of the stator, and the heat conducting member 3 is penetrated through the body 51 .

[0085] The body 51 is sleeved on the outside of the stator to fix the stator, protect the internal components of the motor stator assembly and isolate the external environment. The heat conductor 3 is inserted into the body 51, one end of the heat conductor 3 is in close contact with the stator winding 2, and the other end of the heat conductor 3 extends out of the body 51 and is connected to the heat sink 4.

[0086] The heat dissipation fins 52 are arranged outside the body 51 , and a plurality of heat dissipation fins 52 are distributed at intervals around the circumference of the body 51 . This design increases the heat dissipation area of ​​the housing 5 and improves the heat dissipation efficiency.

[0087] The shape and number of the heat dissipation fins 52 can be optimized according to the heat dissipation requirements of the motor to achieve the best heat dissipation effect.

[0088] like Figure 2 and Figure 3 As shown, the portions of the radiator 4 and the heat conductor 3 located outside the casing 5 do not protrude beyond the heat dissipating fins 52 in the radial direction of the main body 51, that is, the radiator 4 and the heat conductor 3 are at the same height as or lower than the heat dissipating fins 52 in the radial direction of the main body 51, thereby reducing the influence of the outer contour of the casing 5, being beneficial to controlling the radial and circumferential dimensions of the motor stator assembly, and being beneficial to improving the power density of the motor stator assembly.

[0089] In some embodiments, Figure 2 , Fig.10 and Fig.12 As shown, the heat dissipation fins 52 are evenly distributed along the circumferential direction on the outer peripheral surface of the body 51 , and a plurality of mounting holes 511 are provided on the body 51 . The plurality of mounting holes 511 are evenly distributed along the circumferential direction near both ends of the body 51 , and the number of the mounting holes 511 is consistent with the number of the winding coils 21 .

[0090] The heat conducting member 3 is plugged into the mounting hole 511 , which facilitates installation and reduces installation difficulty.

[0091] In some embodiments, Figure 2 and Figure 3 As shown, the heat dissipation fins 52 distributed on both sides of the heat sink 4 along the circumference of the body 51 are spaced apart from the heat sink 4 .

[0092] It can be understood that the sides of the heat dissipating fins 52 distributed on both sides of the radiator 4 along the circumference of the main body 51 are facing the radiator 4. If the heat dissipating fins 52 distributed on both sides of the radiator 4 along the circumference of the main body 51 are connected to the radiator 4, then the heat dissipating fins 52 distributed on both sides of the radiator 4 along the circumference of the main body 51 will block the entire heat dissipation channel between adjacent radiators 4.

[0093] Heat dissipation fins 52 are provided on both sides of the radiator 4. The radiator 4 is spaced apart from the heat dissipation fins 52 on both sides, which can increase the smoothness of the heat dissipation path between adjacent radiators 4, help optimize the heat dissipation path, reduce the thermal interference between the heat dissipation fins 52 and the radiator 4, and improve the heat dissipation efficiency.

[0094] In some embodiments, Figure 3 As shown, the shortest distance between the heat dissipation fins 52 distributed on both sides of the radiator 4 along the circumferential direction of the main body 51 and the radiator 4 does not decrease monotonically along the direction from close to the main body 51 to far away from the main body 51, that is, the shortest distance does not change or gradually increases or first does not change and then increases along the direction from close to the main body 51 to far away from the main body 51.

[0095] In this embodiment, the heat dissipation fins 52 extend radially along the body 51, and the thickness of the heat dissipation fins 52 decreases monotonically from close to the body 51 to away from the body 51, that is, the spacing between two adjacent heat dissipation fins 52 increases monotonically from close to the body 51 to away from the body 51.

[0096] Exemplarily, the shortest distance is set to remain unchanged along the direction from close to the body 51 to far away from the body 51, so that the area of ​​the radiator 4 can gradually increase along the direction from close to the body 51 to far away from the body 51, thereby increasing the heat dissipation area and improving the heat dissipation effect.

[0097] Exemplarily, the shortest distance is set to gradually increase in the direction from close to the body 51 to far away from the body 51, so that the area of ​​the radiator 4 remains unchanged or gradually increases in the direction from close to the body 51 to far away from the body 51, thereby increasing the patency of the heat dissipation path between adjacent radiators 4, maintaining the effective heat dissipation area, and improving the heat dissipation effect.

[0098] Exemplarily, the shortest distance is set to remain unchanged at first and then increase in the direction from close to the body 51 to far away from the body 51, so that the area of ​​the radiator 4 first increases and then remains unchanged or gradually increases in the direction from close to the body 51 to far away from the body 51, but the increasing trend gradually decreases, thereby increasing the patency of the heat dissipation path between adjacent radiators 4, maintaining the effective heat dissipation area, and improving the heat dissipation effect.

[0099] The housing 5 has at least the following two structures.

[0100] First, if Fig.12 As shown, there is only one type of heat dissipation fins 52 , and the heat dissipation fins 52 extend from one end to the other end of the body 51 along the axial direction, and the radiator 4 is disposed between two adjacent heat dissipation fins 52 .

[0101] Second, if Fig.10As shown, the multiple heat dissipation fins 52 include multiple first fins 521 and multiple second fins 522, the first fins 521 extend from one end of the body 51 to the other end along the axial direction, the axial length of the second fins 522 is shorter than the axial length of the first fins 521, at least one second fin 522 is arranged between two adjacent first fins 521, the radiator 4 is arranged between two adjacent first fins 521, and the radiator 4 is arranged at the axial end of the second fin 522.

[0102] In this embodiment, by setting heat dissipation fins 52 with different axial lengths, the first fin 521 is set between two adjacent heat-conducting parts 3 along the circumferential direction, and the second fin 522 is set between two adjacent heat-conducting parts 3 along the radial direction, so that the effective area of ​​the outer wall of the main body 51 can be fully utilized to increase the heat dissipation area of ​​the main body 51.

[0103] In some embodiments, Figure 3 As shown, the heat sink 4 and the first fins 521 are spaced apart from each other.

[0104] In this embodiment, the radiator 4 is spaced apart from the first fins 521 on both sides, which can increase the smoothness of the heat dissipation path between adjacent radiators 4, help optimize the heat dissipation path, reduce thermal interference between the first fins 521 and the radiator 4, and improve heat dissipation efficiency.

[0105] like Figure 1 As shown, the radiator 4 is in contact with the second fin 522, and the second fin 522 can support or position the radiator 4. At the same time, the radiator 4 is in contact with the second fin 522, and the second fin 522 can conduct the heat of the radiator 4 to the external environment, thereby increasing the heat dissipation area and the heat dissipation effect.

[0106] In some embodiments, the motor stator assembly also includes a fixing member, which is arranged between the heat conductor 3 and the casing 5, and can play a sealing and fixing effect, improve the sealing of the casing 5, and at the same time increase the stability of the connection between the heat conductor 3 and the casing 5.

[0107] Exemplarily, the fixing member may be a sealing ring, a sealant, a plastic shell or other structures.

[0108] In the aviation field, high-power density motors play a vital role, and their performance directly affects the power, efficiency and reliability of aircraft. The windings in the motor stator assembly will generate a lot of heat when powered, especially in aviation high-power density motor stator assemblies. Due to the high power density and harsh working environment (such as high temperature, high pressure, high speed, etc.), the heat generated by the windings is more significant. If this heat cannot be dissipated in time, it will cause the local temperature of the motor stator assembly to be too high, which will affect the performance and life of the motor stator assembly, and may even cause safety accidents.

[0109] Due to the limitations of traditional heat dissipation methods, the heat dissipation conditions at the winding ends are poor, such as small heat dissipation surface and poor thermal conductivity of the heat transfer medium. Although the traditional direct air cooling method can increase the airflow at the end, the heat dissipation effect is not obvious because it does not improve the thermal conductivity between the end winding and the air. Although the coolant cooling method can improve the heat dissipation capacity, it is difficult to implement due to the limitations of the motor stator assembly structure, weight and sealing. It needs to be improved.

[0110] In some embodiments, multiple heat sinks 4, heat conductors 3 and fixing parts can be arranged in a modular manner. Multiple heat sinks 4, heat conductors 3 and fixing parts are assembled into an assembly. The assembly is modularly assembled with the stator to reduce the difficulty of assembly and improve the flexibility of the device. It can be arbitrarily combined according to different heat dissipation conditions to facilitate maintenance and replacement.

[0111] In the related art, the disclosed winding end heat dissipation technology generally adopts the method of placing a heat conductive sheet on the upper surface of the winding end or between two adjacent ends. Although the heat dissipation of the end can be improved to a certain extent, there are many disadvantages, such as increasing the complexity of the end structure and the difficulty of installation. In addition, the solution of installing the heat conductive sheet on the periphery of the winding is difficult to ensure that the two are completely fitted, which greatly reduces its heat dissipation effect and limits the development of end heat dissipation technology to a certain extent.

[0112] According to the motor stator assembly provided in the embodiment of the present application, a heat conductor 3 and a heat sink 4 are provided. The heat conductor 3 is located at the inner end of the stator winding 2. On the one hand, it does not affect the position of the lead-out wires reserved at the outer end of the stator winding 2, so that the heat conductor 3 can be provided at both axial ends of the stator winding 2, which can reduce the axial temperature gradient of the stator winding 2 and improve the thermal safety factor of the motor stator assembly; on the other hand, the heat exchange area between the heat conductor 3 and the end face of the stator winding 2 can be increased, thereby improving the heat dissipation effect on the end of the stator winding 2.

[0113] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0114] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0115] In the description of this application, "first feature" or "second feature" may include one or more of the features.

[0116] In the description of the present application, “plurality” means two or more.

[0117] In the description of the present application, a first feature being “on” or “under” a second feature may include that the first and second features are directly in contact with each other, or may include that the first and second features are not in direct contact with each other but are in contact with each other via another feature therebetween.

[0118] In the description of the present application, “above”, “over” and “above” a first feature to a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature.

[0119] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0120] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A motor stator assembly, characterized in that: include: A stator, comprising a stator core and a stator winding; The casing comprises a body and a plurality of heat dissipation fins, wherein the body is sleeved on the outside of the stator, and the heat dissipation fins are arranged on the outside of the body; A heat conducting member is provided through the body and is located at the end of the stator core, and the stator winding is wound around the heat conducting member and the outside of the stator core; A heat sink is connected to the portion of the heat conducting member located outside the housing.

2. The motor stator assembly according to claim 1, characterized in that: The stator core comprises a plurality of stator teeth, which are spaced apart and distributed around the circumference of the stator core. The heat conductor is located at the end of the stator teeth, and the stator winding is wound around the heat conductor and outside the stator teeth.

3. The motor stator assembly according to claim 1, characterized in that: Portions of the heat sink and the heat conducting member located outside the housing do not protrude beyond the heat dissipating fins in the radial direction of the body.

4. The motor stator assembly according to claim 1, characterized in that: The heat sink comprises a plurality of heat sinks, and the plurality of heat sinks are stacked and spaced apart along the axial direction of the heat conducting member.

5. The motor stator assembly according to claim 4, characterized in that: A plurality of heat sinks are sleeved on the heat conducting member, and a heat conducting layer is arranged between the heat sink and the heat conducting member.

6. The motor stator assembly according to claim 1, characterized in that: The plurality of heat dissipation fins are spaced apart and distributed around the circumference of the body, and the heat dissipation fins distributed on both sides of the heat sink along the circumference of the body are spaced apart from the heat sink.

7. The motor stator assembly according to claim 6, characterized in that: The shortest distance between the heat dissipation fins distributed on both sides of the heat sink along the circumference of the body and the heat sink is monotonically constant along a direction from close to the body to far away from the body.

8. The motor stator assembly according to any one of claims 1 to 7, characterized in that: The plurality of heat dissipating fins include a plurality of first fins and a plurality of second fins, the first fins extending from one end of the body to the other end along the axial direction, the axial length of the second fins being shorter than the axial length of the first fins, at least one second fin being arranged between two adjacent first fins, the radiator being arranged between two adjacent first fins, and the radiator being arranged at the axial end of the second fin.

9. The motor stator assembly according to claim 8, characterized in that: The heat sink and the first fin are spaced apart from each other, and the heat sink and the second fin are in contact and connected.

10. The motor stator assembly according to any one of claims 1 to 7, characterized in that: The motor stator assembly also includes a fixing member, which is arranged between the heat conducting member and the housing.

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