Motor stator, motor and vehicle with motor stator

Abstract

The utility model discloses a motor stator, a motor and a vehicle with the motor, and the motor comprises a stator iron core which is provided with a first end and a second end which are opposite to each other in the axial direction; the stator winding is wound on the stator core, the part, extending out of the first end, of the stator winding is an end winding, and a first gap is formed in the end winding; the heat dissipation piece comprises a first evaporation section and a condensation section, the first evaporation section extends in the radial direction of the stator iron core and is arranged in the first gap, the condensation section is connected to the outer end of the first evaporation section in the radial direction of the stator iron core, and the condensation section is located on the radial outer side of the end winding. According to the motor stator provided by the utility model, a uniform and good heat dissipation effect can be obtained in the radial direction of the stator winding, so that the heat dissipation effect of the stator winding is better, the heat dissipation efficiency of the motor is well improved, and the heat dissipation cooling effect of the motor is better.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, in particular to a motor stator, a motor and a vehicle having the same. Background Art

[0002] In today's society, new energy vehicles have gradually become a strategic emerging industry, and the electrification of power systems has become the mainstream consensus of the market. The motor and drive system are the "heart" of new energy vehicles, and are transforming and upgrading to high overload characteristics. It is also the key to energy saving and stable operation of other electrical systems. High overload characteristics include: power density, overload time, overload multiples and other comprehensive technical indicators. High overload brings about a sharp increase in the internal heat of the motor and a serious lack of effective heat dissipation space. Therefore, the heat dissipation problem has become a bottleneck for the motor system to further develop in the direction of high power density.

[0003] At present, air cooling, oil cooling or water cooling is generally used to cool the stator of the motor. When the motor stator is cooled with oil, uneven cooling is prone to occur. The places where the oil can be sprayed are cooled well, while the places where the oil cannot be sprayed or the places where the cooling oil cannot reach are cooled poorly, resulting in poor cooling effect of the motor and poor heat dissipation efficiency. Utility Model Content

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes a motor stator, which can evenly and well cool the stator winding, so that the cooling effect of the stator winding is better, thereby making the motor cooling effect better and improving the heat dissipation efficiency.

[0005] The utility model also provides a motor having the motor stator.

[0006] The utility model also provides a vehicle with the motor.

[0007] According to the first aspect of the utility model, the motor stator includes: a stator core, the stator core having a first end and a second end opposite to each other in the axial direction; a stator winding, the stator winding is wound on the stator core, the part of the stator winding extending out of the first end is the end winding, and a first gap is formed in the end winding; a heat sink, the heat sink includes a first evaporation section and a condensation section, the first evaporation section extends radially along the stator core, the first evaporation section is arranged in the first gap, the first evaporation section is arranged in the first gap, in the radial direction of the stator core, the condensation section is connected to the outer end of the first evaporation section, and the condensation section is located radially outside the end winding.

[0008] According to the motor stator of the utility model, a heat sink is provided and the heat sink is provided with a first evaporation section and a condensation section. The first evaporation section extends into the first gap along the radial direction of the stator core, so that when the stator winding is dissipating heat, a uniform and good heat dissipation effect can be obtained in the radial direction of the stator winding, thereby making the heat dissipation effect of the stator winding better, thereby greatly improving the heat dissipation efficiency of the motor, and making the heat dissipation and cooling effect of the motor better.

[0009] In addition, the motor stator according to the utility model may also have the following additional technical features:

[0010] In some embodiments of the present invention, the end winding includes: an axial segment, the axial segment is formed on a side of the end winding away from the stator core, the axial segment includes a plurality of axial segments, the plurality of axial segments extend along the axial direction of the stator core and are arranged at intervals in the circumferential direction of the stator core, and the first gap is formed between two adjacent axial segments in the circumferential direction of the stator core.

[0011] In some embodiments of the utility model, a second gap is enclosed between the end winding and the end face of the first end, and the heat sink also includes a second evaporation section, which extends radially along the stator core. The second evaporation section is arranged in the second gap, and the outer end of the second evaporation section in the radial direction of the stator core is connected to the condensation section.

[0012] In one embodiment of the present invention, in a direction from the second end toward the first end, the condensation section extends obliquely along the circumference of the stator core.

[0013] In some examples of the present invention, in a projection plane perpendicular to the stator core, there are N axial segments between the first evaporation segment and the second evaporation segment of the same heat sink, where N is 1-4.

[0014] In one embodiment of the present invention, the angle between the first evaporation section and the condensation section is 70°-90°; and / or the angle between the second evaporation section and the condensation section is 70°-90°.

[0015] In one embodiment of the present invention, the maximum dimension of the cross section of the heat sink is 5 mm-8 mm.

[0016] In one embodiment of the utility model, the ratio of the width to the thickness of the condensation section is 1-3; and / or the ratio of the width of the first evaporation section or the width of the second evaporation section to the width of the condensation section is 0.7-1; and / or the ratio of the length of the condensation section to the length of the first evaporation section or the length of the second evaporation section is 1.5-3.

[0017] In one embodiment of the utility model, the first evaporation section has a first surface and a second surface arranged opposite to each other, the first surface is a plane and fits the end winding, and the second surface is an arc surface convex away from the first surface; and / or, a side surface of the condensation section facing the outer peripheral surface of the end winding is an arc surface extending along the circumference of the end winding.

[0018] In an embodiment of the present invention, the first gap is filled with thermally conductive adhesive, and the second gap is filled with thermally conductive adhesive.

[0019] The motor according to the second aspect of the utility model comprises the motor stator according to the first aspect of the utility model.

[0020] According to the motor of the utility model, by setting the motor stator of the first aspect mentioned above, the motor stator is provided with a heat sink and the heat sink is provided with a first evaporation section and a condensation section, and the first evaporation section extends into the first gap along the radial direction of the stator core, so that when the stator winding is dissipating heat, the radial direction of the stator winding can obtain a uniform and good heat dissipation effect, thereby making the heat dissipation effect of the stator winding better, and then the heat dissipation efficiency of the motor is greatly improved, so that the heat dissipation and cooling effect of the motor is better.

[0021] A vehicle according to a third aspect of the utility model comprises the motor according to the second aspect of the utility model.

[0022] According to the vehicle of the utility model, by setting the motor of the second aspect mentioned above, a heat sink is set and the heat sink is provided with a first evaporation section and a condensation section, and the first evaporation section extends into the first gap along the radial direction of the stator core, so that when the stator winding is dissipating heat, the radial direction of the stator winding can obtain a uniform and good heat dissipation effect, thereby making the heat dissipation effect of the stator winding better, and then the heat dissipation efficiency of the motor is greatly improved, so that the heat dissipation and cooling effect of the motor is better.

[0023] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic diagram of a motor stator according to an embodiment of the utility model;

[0025] Figure 2 is a schematic diagram of a partial enlargement of the end winding of the motor stator according to an embodiment of the utility model;

[0026] Figure 3 Schematic diagram of a heat sink according to an embodiment of the present utility model.

[0027] Reference numerals:

[0028] 10. stator core; 11. first end;

[0029] 20. stator winding; 201. first gap; 202. second gap;

[0030] 21. end winding; 211. axial section;

[0031] 30. heat sink; 31. first evaporation section; 32. second evaporation section; 33. condensation section;

[0032] 100. Motor stator. DETAILED DESCRIPTION

[0033] The embodiments of the present invention 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 intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0034] Reference below Figure 1-Figure 3 A motor stator 100 according to an embodiment of the first aspect of the present utility model is described.

[0035] like Figure 1-Figure 3 As shown, the motor stator 100 according to the first embodiment of the utility model includes: a stator core 10, a stator winding 20 and a heat sink 30.

[0036] Specifically, the stator core 10 has a Figure 1 The stator core 10 comprises a first end 11 and a second end opposite to each other in the front-to-back direction (as shown in the figure); the stator winding 20 is wound on the stator core 10, and the part of the stator winding 20 extending out of the first end 11 is the end winding 21, and a first gap 201 is formed in the end winding 21; the heat sink 30 includes a first evaporation section 31 and a condensation section 33, the first evaporation section 31 extends radially along the stator core 10, and the first evaporation section 31 is arranged in the first gap 201, and in the radial direction of the stator core 10, the condensation section 33 is connected to the outer end of the first evaporation section 31, and the condensation section 33 is located radially outside the end winding 21.

[0037] It can be understood that when the motor stator 100 is cooled and dissipated, the cooling oil is sprayed onto the outer peripheral surface of the stator core 10 and the outer peripheral surface of the stator winding 20 to dissipate heat for the stator core 10 and the stator winding 20. At the position of the end winding 21, the radial outer side of the end winding 21 can obtain direct spray cooling of the cooling oil. The cooling effect of the cooling oil on the end winding 21 gradually deteriorates from the outside to the inside in the radial direction. It is difficult for the radial inner side of the end winding 21 to obtain effective and good spray heat dissipation, which makes the cooling of the end winding 21 uneven and the heat dissipation effect poor.

[0038] In the present embodiment, a heat sink 30 is provided, and a first evaporation section 31 of the heat sink 30 extends radially along the stator core 10 and is provided in the first gap 201. The first evaporation section 31 can extend to the radial inner side of the end winding 21. When the end winding 21 dissipates heat, the heat at the radial inner side where the cooling oil is difficult to spray can be conducted to the radial outer side of the end winding 21 through the first evaporation section 31, so that the radial inner side of the end winding 21 can be well cooled and dissipated, and the cooling of the end winding 21 is more uniform and the cooling effect is better.

[0039] The heat sink 30 is provided with a first evaporation section 31 and a condensation section 33, that is, the heat sink 30 can be formed into a heat pipe structure. When the heat sink 30 conducts heat, on the one hand, the heat can be conducted along the heat sink 30 to the radial outer side of the end winding 21, and on the other hand, the working medium in the first evaporation section 31 can absorb heat and be converted into steam. The steam carries the heat and flows to the condensation section 33. Under the direct spray cooling effect of the cooling oil on the condensation section 33, the steam releases heat and condenses in the condensation section 33 and flows back to the first evaporation section 31. The heat is transferred back and forth in this way. The heat transfer efficiency is high and the speed is fast, so that the heat dissipation efficiency of the end winding 21 is effectively improved when it is cooled, and the radial direction of the end winding 21 can obtain more uniform and good cooling and heat dissipation, so that the stator winding 20 obtains a better heat dissipation effect.

[0040] According to the motor stator 100 of the embodiment of the utility model, a heat sink 30 is provided and the heat sink 30 is provided with a first evaporation section 31 and a condensation section 33. The first evaporation section 31 extends into the first gap 201 along the radial direction of the stator core 10, so that when the stator winding 20 is dissipating heat, the stator winding 20 can obtain a uniform and good heat dissipation effect in the radial direction, thereby making the heat dissipation effect of the stator winding 20 better, thereby greatly improving the heat dissipation efficiency of the motor, and making the heat dissipation and cooling effect of the motor better.

[0041] In some embodiments of the present invention, Figure 2 As shown, the end winding 21 may include: an axial segment 211, the axial segment 211 is formed on the side of the end winding 21 away from the stator core 10, the axial segment 211 includes a plurality of axial segments 211, the plurality of axial segments 211 extend along the axial direction of the stator core 10 and are arranged at intervals in the circumferential direction of the stator core 10, and a first gap 201 is formed between two adjacent axial segments 211 in the circumferential direction of the stator core 10.

[0042] In this embodiment, the end winding 21 includes a plurality of axial segments 211, and a first gap 201 is formed between adjacent axial segments 211, so that the first evaporation segment 31 and the axial segment 211 of the end winding 21 have a larger contact heat exchange area in the first gap 201, so that the heat sink 30 can dissipate heat for the stator winding 20 well, thereby making the heat dissipation effect of the motor at the end winding 21 better.

[0043] In this embodiment, the axial section 211 is set to be formed on the side of the end winding 21 away from the stator core 10, so that when the heat sink 30 is assembled in the motor stator 100, the first evaporation section 31 can be arranged at the end of the end winding 21 away from the stator core 10, so that the end of the end winding 21 away from the stator core 10 can obtain the good heat dissipation effect of the heat sink 30, so that the heat dissipation effect of the stator winding 20 is better, and then the motor can obtain better heat dissipation and cooling effect, making the motor run more stably.

[0044] In some embodiments of the present invention, Figure 2 As shown, a second gap 202 can be enclosed between the end winding 21 and the end surface of the first end 11, and the heat sink 30 also includes a second evaporation section 32, which extends radially along the stator core 10. The second evaporation section 32 is arranged in the second gap 202, and the outer end of the second evaporation section 32 in the radial direction of the stator core 10 is connected to the condensation section 33.

[0045] In this embodiment, the heat sink 30 is also provided with a second evaporation section 32, which is arranged in the second gap 202. The heat of the radial inner side of the end winding 21 at the first end 11 and the heat of the radial inner side of the stator core 10 can be conducted to the outside, so that the stator winding 20 can obtain a uniform and good cooling effect when cooling, so that the heat dissipation effect of the stator winding 20 is better.

[0046] Since the second gap 202 is formed by the end winding 21 and the end surface of the first end 11, Figure 2 As shown, the first gap 201 and the second gap 202 are arranged along the axial direction of the stator core 10, and the heat sink 30 is provided with a first evaporation section 31 and a second evaporation section 32 to conduct heat to the end winding 21 at the first gap 201 and the second gap 202, which can well cover the axial extension area of ​​the end winding 21 in the stator core 10, so that the end winding 21 can obtain uniform and good cooling in the axial extension area of ​​the stator core 10, and the cooling effect is better.

[0047] The heat sink 30 can well cover the heat conduction of the axial extension area of ​​the end winding 21 in the stator core 10 by setting the first evaporation section 31, the second evaporation section 32 and the condensation section 33. It has a simple structure and can reduce the number of heat sinks 30 required for cooling and dissipating the end winding 21 to a certain extent, thereby reducing the production cost of the motor stator 100.

[0048] refer to Figure 2 As shown, when the heat sink 30 is assembled with the end winding 21 and the stator core 10, in the axial extension direction of the end winding 21 along the stator core 10, the condensation section 33 is bridged across the radial outer side of the end winding 21, the first evaporation section 31 extends into the first gap 201, and the second evaporation section 32 extends into the second gap 202. In this way, the heat sink 30 and the end winding 21 have a larger contact area, which can make the heat dissipation efficiency of the heat sink 30 higher, and the heat sink 30 can be more conveniently and easily fixed on the end winding 21, making it more convenient and easy to assemble the heat sink 30 and the end winding 21.

[0049] In one embodiment of the present invention, Figure 2 As shown, in the direction from the second end toward the first end 11 , the condensing section 33 may extend obliquely along the circumference of the stator core 10 .

[0050] The condensing section 33 is arranged to extend obliquely along the circumference of the stator core 10, so that the heat sink 30 can have a good thermal conductivity effect on the end winding 21. The heat sink 30 can cover a larger area in the circumference of the end winding 21 and in the axial direction of the end winding 21 along the stator core 10, thereby reducing the number of heat sinks 30 used to a certain extent and reducing the cost of the motor.

[0051] The condensing section 33 extends obliquely along the circumference of the stator core 10 in the direction from the second end toward the first end 11, so that the condensing section 33 has a sufficient length to make good contact with the cooling oil, so that the thermal conductivity of the heat pipe can be fully utilized, and the heat sink 30 can be more conveniently and easily fixed to the end winding 21 through the first evaporation section 31, the second evaporation section 32 and the condensing section 33, so that the heat sink 30 is fixed to the end winding 21 more stably and securely.

[0052] In some examples of the present invention, reference Figure 2 As shown, in a projection plane perpendicular to the stator core 10 , a same heat sink 30 may have N axial sections 211 between the first evaporation section 31 and the second evaporation section 32 , where N is 1-4.

[0053] In this embodiment, the projection plane perpendicular to the stator core 10 refers to the projection plane perpendicular to the axial direction of the stator core 10. By limiting the number of axial sections 211 between the first evaporation section 31 and the second evaporation section 32, the condensation section 33 in the heat sink 30 can have a sufficient length, so that the thermal conductivity of the heat sink 30 can be fully utilized, and the end winding 21 can obtain good and uniform heat dissipation. At the same time, it can avoid that the heat sink 30 crosses too many axial sections 211 to reduce the thermal conductivity effect on the radial inner side of the end winding 21, so that the end winding 21 can maintain a high heat dissipation efficiency when dissipating heat. For example, the number N of axial sections 211 can be one, two, three or four. Preferably, there are two axial sections 211 between the first evaporation section 31 and the second evaporation section 32.

[0054] In one embodiment of the present invention, reference Figure 3 As shown, the angle between the first evaporation section 31 and the condensation section 33 may be 70°-90°.

[0055] By limiting the angle between the first evaporation section 31 and the condensation section 33 to between 70° and 90°, the angle between the first evaporation section 31 and the condensation section 33 can be within a suitable range, so that the first evaporation section 31 can be easily inserted into the first gap 201 for assembly and fixation with the end winding 21, and the condensation section 33 can be well fitted with the radial outer surface of the end winding 21, so that the assembly of the heat sink 30 and the end winding 21 is more convenient and easy, and the heat sink 30 can better conduct heat. In this embodiment, the angle between the first evaporation section 31 and the condensation section 33 is limited to between 70° and 90°, so that the first evaporation section 31 can cooperate with the condensation section 33 and the end winding 21 to form a relatively stable and good clamping fixation, so that the heat sink 30 and the end winding 21 can be fixed relatively stably and easily. For example, the angle between the first evaporation section 31 and the condensation section 33 can be 75°, 80°, 85°, etc.

[0056] In one embodiment of the present invention, reference Figure 3 As shown, the angle between the second evaporation section 32 and the condensation section 33 may be 70°-90°.

[0057] By limiting the included angle between the second evaporation section 32 and the condensation section 33 to between 70° and 90°, the included angle between the second evaporation section 32 and the condensation section 33 can be within a suitable range, so that the second evaporation section 32 can be easily inserted into the first gap 201 for assembly and fixation with the end winding 21, and the condensation section 33 can be well fitted with the radial outer surface of the end winding 21, so that the assembly of the heat sink 30 and the end winding 21 is more convenient and easy, and the heat sink 30 can better conduct heat. In this embodiment, the included angle between the second evaporation section 32 and the condensation section 33 is limited to between 70° and 90°, so that the second evaporation section 32 can cooperate with the condensation section 33 and the end winding 21 to form a relatively stable and good clamping fixation, so that the heat sink 30 and the end winding 21 can be fixed relatively stably and easily. For example, the included angle between the second evaporation section 32 and the condensation section 33 can be 75°, 80°, 85°, etc.

[0058] In one embodiment of the present invention, reference Figure 3 As shown, the angle between the first evaporation section 31 and the condensation section 33 may be 70°-90°, and the angle between the second evaporation section 32 and the condensation section 33 may be 70°-90°.

[0059] In this embodiment, the angle between the first evaporation section 31 and the condensation section 33 is limited to between 70° and 90°, and the angle between the second evaporation section 32 and the condensation section 33 is limited to between 70° and 90°, so that the first evaporation section 31 and the second evaporation section 32 in the heat sink 30 can be easily and conveniently inserted into the first gap 201 and the second gap 202 respectively, so that the heat sink 30 can be stably and reliably clamped and fixed on the end winding 21 through the first evaporation section 31 and the second evaporation section 32 and the condensation section 33, and the heat sink 30 can conduct heat to the end winding 21 well, so that the end winding 21 has a better heat dissipation effect. Figure 3 As shown in the figure, the angle α is schematically represented by the angle between the first evaporation section 31 and the condensation section 33 and the angle between the second evaporation section 32 and the condensation section 33 .

[0060] refer to Figure 3 As shown, when the heat sink 30 is manufactured, the condensation section 33 and the first evaporation section 31 and the second evaporation section 32 of the heat sink 30 can be formed by bending. Specifically, the heat sink 30 can be a straight tube before bending, and the heat sink 30 is bent in a bending machine to form the first evaporation section 31, the second evaporation section 32 and the condensation section 33 with the required angle. Furthermore, the heat sink 30 can be a copper part, so that the heat sink 30 has good thermal conductivity and better thermal conductivity.

[0061] Furthermore, the heat sink 30 may be formed with a cavity, and a liquid absorption layer is formed on the inner wall surface of the heat sink 30, and the cavity is filled with a working medium. When the heat sink 30 is conducting heat, the heat generated by the radial inner side of the end winding 21 heats the working medium at the first evaporation section 31 and the second evaporation section 32, and the working medium absorbs the heat and evaporates into gas, and the gas flows along the cavity to the condensation section 33. Under the spray cooling of the cooling oil, the gas working medium releases heat and liquefies at the condensation section 33, and the liquid working medium flows back to the first evaporation section 31 and the second evaporation section 32 along the liquid absorption layer, and this process is repeated, so that the heat generated by the radial inner side of the end winding 21 can be continuously transferred to the radial outer side of the end winding 21, so that the end winding 21 can obtain a uniform and good cooling effect in the radial direction, and then the cooling and heat dissipation effect of the stator winding 20 is better.

[0062] When the heat sink 30 is processed and manufactured, a liquid absorption layer can be formed on the inner wall surface of the heat sink 30 by sintering. Specifically, the heat sink 30 can be a straight tube. The opening at one end of the heat sink 30 can be reduced in a shrinking machine and the opening can be sealed by a spot welding machine. Then a steel rod is extended into the cavity in the tube from the other end opening, and copper powder is filled in the gap between the steel rod and the inner wall of the tube. Then, the heat sink 30 and the steel rod filled with copper powder are placed in a furnace and sintered at a high temperature of 960° for 6 hours. During the sintering process, a mixed gas of 5% hydrogen and 95% nitrogen can be continuously introduced for anti-oxidation protection to cause the copper powder to sinter to form a liquid absorption layer.

[0063] After the liquid absorption layer is formed, the steel rod is withdrawn from the cavity, and the production personnel can pour the liquid working medium into the cavity in the tube of the heat sink 30, and seal the opening by shrinking the cavity and spot welding. The liquid working medium can be deionized water, which can avoid the generation of scale or precipitation, so that the heat sink 30 can conduct heat and transfer heat stably and reliably for a long time. Specifically, after pouring deionized water, the heat sink 30 needs to freeze the working medium in a low temperature environment below -10°C, so that the cavity of the heat sink 30 can be well vacuumed. In this embodiment, the air pressure in the cavity of the heat sink 30 is sealed after being evacuated to 8 Pascals, so that the working medium is sealed in the cavity.

[0064] In one embodiment of the present invention, the maximum dimension of the cross section of the heat sink 30 may be 5 mm-8 mm.

[0065] The cross section of the heat sink 30 refers to the cross section of the heat sink 30 perpendicular to its extension direction, so that the heat sink 30 has a sufficient cross-sectional size, so that the heat conduction efficiency and heat conduction effect of the heat sink 30 can meet the requirements of end thermal resistance heat dissipation cooling, and it can avoid that the heat sink 30 is too large and makes it difficult to assemble the heat sink 30 in the motor stator 100, and the first evaporation section 31 or the second evaporation section 32 is difficult to insert into the first gap 201 or the second gap 202, so that the heat sink 30 can be well matched with the end winding 21. For example, the maximum size of the cross section of the heat sink 30 can be 5mm, 6mm, 7mm, 8mm, etc. The maximum size of the cross section of the heat sink 30 can be set according to the size of the stator core 10 of the motor stator 100 and the stator winding 20, so that it can be well matched with the first gap 201 and the second gap 202. Preferably, the maximum size of the cross section of the heat sink 30 is 8mm.

[0066] In one embodiment of the present invention, the ratio of the width to the thickness of the condensation section 33 may be 1-3.

[0067] In this embodiment, the width of the condensation section 33 refers to the longer long side dimension of the cross section of the condensation section 33, and the thickness of the condensation section 33 refers to the shorter short side dimension of the cross section of the condensation section 33. In this embodiment, the ratio of the width to the thickness of the condensation section 33 is limited to between 1 and 3, so that the condensation section 33 has a sufficient thickness dimension, so that the gas and liquid in the condensation section 33 can flow well, and the heat sink 30 can conduct heat well and stably. For example, the ratio of the width to the thickness of the condensation section 33 can be 1, 1.5, 2, 2.5, 3, etc. Preferably, the ratio of the width to the thickness of the condensation section 33 is 1.5.

[0068] In one embodiment of the present invention, the ratio of the width of the first evaporation section 31 or the width of the second evaporation section 32 to the width of the condensation section 33 may be 0.7-1.

[0069] In this embodiment, the width of the first evaporation section 31 refers to the longer long side dimension of the cross section of the first evaporation section 31, and the width of the second evaporation section 32 refers to the longer long side dimension of the cross section of the second evaporation section 32. In this embodiment, the ratio of the width of the first evaporation section 31 to the width of the condensation section 33 is set between 0.7 and 1, or the ratio of the width of the second evaporation section 32 to the width of the condensation section 33 is set between 0.7 and 1, so that the size of the first evaporation section 31 and the condensation section 33 or the second evaporation section 32 and the condensation section 33 of the heat sink 30 can be determined more conveniently, so that the first evaporation section 31 meets the need of matching with the first gap 201, or the second evaporation section 32 meets the need of matching with the second gap 202, so that the structural design of the heat sink 30 is more reasonable, and the assembly requirements of the heat sink 30 and the end winding 21 are better met, so that the heat sink 30 can perform good heat conduction and heat dissipation on the end winding 21.

[0070] For example, the ratio of the width of the first evaporation section 31 or the width of the second evaporation section 32 to the width of the condensation section 33 can be 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, etc. The specific width ratio can be reasonably set according to the actual assembly and heat dissipation requirements of the heat sink 30 and the end winding 21.

[0071] In one embodiment of the present invention, the ratio of the length of the condensation section 33 to the length of the first evaporation section 31 or the length of the second evaporation section 32 may be 1.5-3.

[0072] In this embodiment, the length of the condensation section 33 refers to the length dimension of the condensation section 33 in its extension direction, the length of the first evaporation section 31 refers to the length dimension of the first evaporation section 31 in its extension direction, and the length of the second evaporation section 32 refers to the length dimension of the second evaporation section 32 in its extension direction. In this embodiment, the ratio of the length of the condensation section 33 to the length of the first evaporation section 31 or the length of the condensation section 33 to the length of the second evaporation section 32 is set between 1.5 and 3, which can facilitate the determination of the total length of the heat sink 30 and the matching of the number of axial sections 211 spanning the heat sink 30. For example, when the number of axial sections 211 spanning the heat sink 30 is large, the ratio of the length of the condensation section 33 to the length of the first evaporation section 31 can be set larger, so that the condensation section 33 has a suitable length dimension, so that the heat sink 30 can be well assembled with the end winding 21, so that the assembly production of the heat sink 30 and the stator winding 20 is more convenient and efficient.

[0073] For example, the ratio of the length of the condensation section 33 to the length of the first evaporation section 31 or the length of the condensation section 33 to the length of the second evaporation section 32 can be 1.5, 1.7, 1.9, 2.1, 2.3, 2.5, 2.7, 2.9, etc. The ratio of the length of the condensation section 33 to the length of the first evaporation section 31 or the length of the second evaporation section 32 can be reasonably set according to the requirements of the cross-connection assembly of the heat sink 30 and the end winding 21 in actual production.

[0074] In one embodiment of the utility model, the ratio of the width to the thickness of the condensation section 33 can be 1-3, the ratio of the width of the first evaporation section 31 or the width of the second evaporation section 32 to the width of the condensation section 33 can be 0.7-1, and the ratio of the length of the condensation section 33 to the length of the first evaporation section 31 or the length of the second evaporation section 32 can be 1.5-3.

[0075] In this way, the width, thickness and length dimensions of the first condensation section 33 and the first evaporation section 31 and the second evaporation section 32 in the heat sink 30 can be conveniently and quickly determined during actual production and processing, so that the specific size and shape of the heat sink 30 after processing can well meet the thermal conductivity requirements of the end winding 21 and the needs of fixed matching with the end winding 21, thereby making the production and manufacturing of the heat sink 30 more standardized and modeled to a certain extent, which is beneficial to improving the production efficiency of the motor stator 100.

[0076] In one embodiment of the present invention, reference Figure 2 and Figure 3 As shown, the first evaporation section 31 may have a first surface and a second surface arranged opposite to each other, the first surface is a plane and fits with the end winding 21 , and the second surface is an arc surface convex toward and away from the first surface.

[0077] In this embodiment, the first surface of the first evaporation section 31 is arranged to fit the end winding 21, so that heat can be better transferred from the end winding 21 to the first evaporation section 31, and then the heat sink 30 can better transfer heat, so that the heat conduction efficiency of the heat sink 30 is higher, and the end winding 21 can obtain a better heat dissipation and cooling effect. The second surface of the first evaporation section 31 is convex away from the first surface, so that the first evaporation section 31 has a sufficient heat conduction volume, and the cavity at the first evaporation section 31 is large enough, so that the heat sink 30 can stably and well transfer heat.

[0078] In one embodiment of the present invention, reference Figure 2 and Figure 3 As shown, the surface of the condensing section 33 on one side facing the outer circumference of the end winding 21 is an arc surface extending along the circumference of the end winding 21 .

[0079] In this way, the condensing section 33 can be better fitted and assembled with the end winding 21, and the condensing section 33 and the end winding 21 have a larger heat conduction area, so that the heat sink 30 can better conduct heat to the end winding 21, and then the end winding 21 can obtain a better heat dissipation effect. The surface of one side of the outer peripheral surface of the condensing section 33 facing the end winding 21 is set as a curved surface, which has a simple structure and is easy to process.

[0080] In one embodiment of the present invention, reference Figure 2 and Figure 3 As shown, the first evaporation section 31 can have a first surface and a second surface arranged relatively to each other, the first surface is a plane and fits with the end winding 21, and the second surface is an arc surface convex toward and away from the first surface; the side surface of the condensation section 33 facing the outer peripheral surface of the end winding 21 is an arc surface extending along the circumference of the end winding 21.

[0081] Therefore, the first evaporation section 31 is provided with a first surface and a second surface arranged relatively to each other. The first surface is set as a plane so that it can better fit with the end winding 21, and the second surface is away from the first surface to form a raised arc surface so that the first evaporation section 31 has a sufficient volume, so that the heat sink 30 can conduct heat well and stably, so that the heat sink 30 can well transfer the heat from the radial inner side of the end winding 21 to the outer peripheral surface for heat dissipation, so that the heat dissipation of the end winding 21 is more uniform and the heat dissipation effect is better.

[0082] refer to Figure 3 As shown, during the processing of the heat sink 30, a press machine can be used to press and form the specific shapes of the first evaporation section 31, the second evaporation section 32 and the condensation section 33 of the heat sink 30, so that the processing and manufacturing of the heat sink 30 can be faster and more convenient.

[0083] In one embodiment of the present invention, reference Figure 2 As shown, the first gap 201 may be filled with thermally conductive adhesive, and the second gap 202 may be filled with thermally conductive adhesive.

[0084] In this way, the heat on the axial section 211 can be better transferred to the first evaporation section 31 and the second evaporation section 32, so that the heat sink 30 can better conduct heat. The thermal conductive adhesive can make the first evaporation section 31 and the second evaporation section 32 stably and firmly connected to the axial section 211, so that the heat sink 30 and the end winding 21 can be connected and fixed more conveniently and reliably.

[0085] Reference below Figure 1-Figure 3 A motor according to an embodiment of the second aspect of the utility model is described.

[0086] like Figure 1-Figure 3 As shown, the motor according to the present utility model comprises a motor stator 100 according to an embodiment of the first aspect of the present utility model.

[0087] According to the motor of the embodiment of the utility model, by setting the motor stator 100 of the first aspect embodiment mentioned above, the motor stator 100 is provided with a heat sink 30 and the heat sink 30 is provided with a first evaporation section 31 and a condensation section 33, and the first evaporation section 31 extends into the first gap 201 along the radial direction of the stator core 10, so that when the stator winding 20 is dissipating heat, the radial direction of the stator winding 20 can obtain a uniform and good heat dissipation effect, thereby making the heat dissipation effect of the stator winding 20 better, thereby making the heat dissipation efficiency of the motor greatly improved, and making the heat dissipation and cooling effect of the motor better.

[0088] Reference below Figure 1-Figure 3 A vehicle according to an embodiment of the third aspect of the utility model is described.

[0089] like Figure 1-Figure 3 As shown, the vehicle according to the present utility model includes a motor according to an embodiment of the second aspect of the present utility model.

[0090] According to the vehicle of the embodiment of the utility model, by setting the motor of the above-mentioned second aspect embodiment, a heat sink 30 is set and the heat sink 30 is provided with a first evaporation section 31 and a condensation section 33. The first evaporation section 31 extends into the first gap 201 along the radial direction of the stator core 10, so that when the stator winding 20 is dissipating heat, the radial direction of the stator winding 20 can obtain a uniform and good heat dissipation effect, thereby making the heat dissipation effect of the stator winding 20 better, and then the heat dissipation efficiency of the motor is greatly improved, so that the heat dissipation and cooling effect of the motor is better.

[0091] The following will refer to Figure 1-Figure 3 A vehicle according to a specific embodiment of the present invention is described.

[0092] like Figure 1-Figure 3 As shown, a motor is provided in a vehicle, and the motor includes a motor stator 100, and the motor stator 100 includes a stator core 10, a stator winding 20 and a heat sink 30. The stator winding 20 is wound on the stator core 10 and protrudes from the stator core 10 at both ends along the axial direction of the stator core 10 to form an end winding 21. The end winding 21 has an axial section 211, and the axial section 211 is formed on the side of the end winding 21 away from the stator core 10. There are multiple axial sections 211, and the multiple axial sections 211 extend along the axial direction of the stator core 10 and are arranged at intervals in the circumferential direction of the stator core 10. A first gap 201 is formed between two adjacent axial sections 211, and a second gap 202 is formed between the end winding 21 and the end surface of the stator core 10. It can be seen from the figure that there are multiple first gaps 201 and second gaps 202.

[0093] The heat sink 30 is a U-shaped heat pipe, and includes a first evaporation section 31, a second evaporation section 32 and a condensation section 33. The first evaporation section 31 and the second evaporation section 32 both extend in the radial direction of the stator core 10 and are respectively connected to the two ends of the condensation section 33. The first evaporation section 31 is inserted into the first gap 201, and the second evaporation section 32 is inserted into the second gap 202. Two axial sections 211 are spanned between the first evaporation section 31 and the second evaporation section 32. The condensation section 33 is provided on the outer circumferential surface of the end winding 21 and is in contact with the outer circumferential surface of the end winding 21. The condensation section 33 extends obliquely along the circumferential direction of the stator core 10 in the axial direction of the stator core 10. There are multiple heat sinks 30, and the multiple heat sinks 30 are evenly spaced and arranged in the circumferential direction of the end winding 21.

[0094] The heat sink 30 has a liquid absorption layer and a cavity, and 200 microliters of deionized water is filled in the cavity. In this embodiment, when the heat sink 30 is processed and manufactured, a copper tube with an outer diameter of 8 mm and an inner diameter of 7 mm is selected as the raw material, and the copper tube is cut into a tube section with a length of 100 mm. The production personnel use a shrinking machine to shrink the opening at one end of the copper tube and use an electric welder to seal it, insert a 4 mm diameter steel rod from the other end, fill the space between the steel rod and the inner wall of the copper tube with copper powder with a thickness of about 20 microns, and sinter it in a furnace at a high temperature of 960°C for 6 hours. During the sintering period, a mixed gas of 5% hydrogen and 95% nitrogen is continuously introduced for protection to prevent copper oxidation.

[0095] After sintering, the copper rod is withdrawn, the opening of the copper tube is shrunk, and 200 microliters of deionized water is injected into the tube. After the deionized water freezes at -10°C, the tube is vacuumed to make the air pressure inside the tube 8 Pascals, and the opening is sealed. The production staff uses a bending machine to bend the copper tube at one-quarter of both ends to form the first evaporation section 31, the condensation section 33 and the second evaporation section 32, and the angle is bent to 80°. Then the first evaporation section 31, the second evaporation section 32 and the condensation section 33 are pressed by a press machine, so that the ratio of the width to the thickness of the condensation section 33 is 1.5, and the ratio of the width of the evaporation section to the width of the condensation section 33 is 0.9, thereby completing the processing of the heat sink 30. The manufactured heat sink 30 can be tested to remove defective products.

[0096] When the heat sink 30 is assembled with the stator winding 20, the first evaporation section 31 and the second evaporation section 32 are respectively inserted into the first gap 201 and the second gap 202 from the outer peripheral surface of the end winding 21, so that the heat sink 30 is snap-fitted and fixed on the end winding 21, and thermal conductive glue is filled between the first evaporation section 31 and the inner wall of the first gap 201, and thermal conductive glue is filled between the second evaporation section 32 and the inner wall of the second gap 202.

[0097] During the use of the motor, when the stator winding 20 generates heat, cooling oil is sprayed on the stator core 10 and the outer circumference of the stator winding 20 to cool the stator winding 20 and the stator core 10. A part of the heat of the stator winding 20 is dissipated through heat conduction of the stator core 10, and the heat generated by the end winding 21 on the radially inner part of the stator core 10 is conveniently and quickly transferred to the outer circumferential surface of the end winding 21 through the heat sink 30, so that the radial inner side of the end winding 21 can obtain good cooling and heat dissipation, so that the cooling of the end winding 21 is more uniform, and the overall temperature of the stator winding 20 can be consistent under the spray cooling of the cooling oil, so that the stator winding 20 can obtain better cooling and heat dissipation effect, so that the cooling efficiency of the motor stator 100 is greatly improved, and the peak power density and continuous power density of the motor stator 100 can be improved to a certain extent, so that the dynamic performance of the whole vehicle is greatly improved.

[0098] In the description of the present invention, 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 invention 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 invention.

[0099] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0100] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0101] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. 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 utility model. In this specification, the schematic representations of the above terms do 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. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0102] Although the embodiments of the present invention 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 invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A motor stator, characterized in that: include: A stator core having a first end and a second end opposite to each other in the axial direction; A stator winding, wherein the stator winding is wound on the stator core, a portion of the stator winding extending from the first end is an end winding, and a first gap is formed in the end winding; The heat sink comprises a first evaporation section and a condensation section, wherein the first evaporation section extends radially along the stator core, the first evaporation section is arranged in the first gap, and in the radial direction of the stator core, the condensation section is connected to the outer end of the first evaporation section, and the condensation section is located radially outside the end winding.

2. The motor stator according to claim 1, characterized in that: The end winding includes: an axial segment, which is formed on a side of the end winding away from the stator core. The axial segment includes a plurality of segments, which extend along the axial direction of the stator core and are arranged at intervals in the circumferential direction of the stator core. In the circumferential direction of the stator core, the first gap is formed between two adjacent axial segments.

3. The motor stator according to claim 2, characterized in that: A second gap is enclosed between the end winding and the end surface of the first end, and the heat sink also includes a second evaporation section, which extends radially along the stator core. The second evaporation section is arranged in the second gap, and the outer end of the second evaporation section in the radial direction of the stator core is connected to the condensation section.

4. The motor stator according to claim 3, characterized in that: In a direction from the second end toward the first end, the condensing section extends obliquely along the circumferential direction of the stator core.

5. The motor stator according to claim 4, characterized in that: In a projection plane perpendicular to the stator core, there are N axial sections between the first evaporation section and the second evaporation section of the same heat sink, where N is 1-4.

6. The motor stator according to claim 3, characterized in that: The angle between the first evaporation section and the condensation section is 70°-90°; and / or the angle between the second evaporation section and the condensation section is 70°-90°.

7. The motor stator according to claim 3, characterized in that: The maximum dimension of the cross section of the heat sink is 5 mm to 8 mm.

8. The motor stator according to claim 3, characterized in that: The ratio of the width to the thickness of the condensation section is 1-3; and / or, The ratio of the width of the first evaporation section or the width of the second evaporation section to the width of the condensation section is 0.7-1; and / or, The ratio of the length of the condensation section to the length of the first evaporation section or the length of the second evaporation section is 1.5-3.

9. The motor stator according to claim 3, characterized in that: The first evaporation section has a first surface and a second surface arranged opposite to each other, the first surface is a plane and fits the end winding, and the second surface is a curved surface convex away from the first surface; and / or, A surface of one side of the condensing section facing the outer circumference of the end winding is an arc surface extending along the circumference of the end winding.

10. The motor stator according to claim 3, characterized in that: The first gap is filled with thermally conductive adhesive, and the second gap is filled with thermally conductive adhesive.

11. A motor, characterized in that: The invention comprises the motor stator according to any one of claims 1 to 10.

12. A vehicle, characterized in that: Comprising an electric machine according to claim 11.

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