Motor and vehicle

Abstract

The utility model discloses a motor and a vehicle. The motor comprises a stator assembly, a rotor assembly, a housing, a first end cover and a second end cover. The shell is provided with a containing cavity, and the stator assembly and the rotor assembly are arranged in the containing cavity. The first end cover is arranged at one axial end of the shell, and the first end cover abuts against the stator assembly and the shell. The second end cover is arranged at the other axial end of the shell and abuts against the stator assembly and the shell. According to the motor provided by the utility model, the two axial ends of the housing are respectively provided with one of the first end cover and the second end cover, and the first end cover and the second end cover are both in abutting fit with the stator assembly and the housing, thereby simplifying the assembly difficulty, facilitating the separation of different areas of the accommodation cavity, achieving the sealing of the stator assembly at the two axial ends of the housing, and improving the sealing performance of the motor. The influence between the stator assembly and the rotor assembly is reduced, and the operation stability of the motor is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to vehicle technical field especially a kind of motor and vehicle. BACKGROUND

[0002] Motor is a kind of device that converts electric energy into mechanical energy, works through electromagnetic induction principle, can drive equipment to do rotation or linear motion.The isolation between the stator and rotor of motor is one of key design elements to ensure that motor is normal, safe operation.This isolation is not only for electrical insulation, but also for mechanical stability and prevent unnecessary physical contact.In related technologies, insulation structure is often used to realize the isolation of stator and rotor, however, the use of insulation structure increases the assembly difficulty of motor. SUMMARY

[0003] The utility model at least solves one of the technical problems existing in prior art. To this end, one purpose of the utility model is to provide a motor, which simplifies the assembly difficulty, is conducive to the different regions of the interval accommodating cavity, reduces the influence between stator assembly and rotor assembly, and is conducive to improving the operation stability of motor.

[0004] Another purpose of the utility model is to provide a vehicle.

[0005] According to the motor of the first aspect embodiment of the utility model, the motor comprises: a stator assembly and a rotor assembly; a housing, the housing has an accommodating cavity, the stator assembly and the rotor assembly are arranged in the accommodating cavity; a first end cover, the first end cover is arranged at one end of the axial direction of the housing, and the first end cover is abutted with the stator assembly and the housing respectively; a second end cover, the second end cover is arranged at the other end of the axial direction of the housing, and the second end cover is abutted with the stator assembly and the housing respectively.

[0006] According to the motor of the utility model embodiment, one of the first end cover and the second end cover is arranged at the two ends of the axial direction of the housing, and the first end cover and the second end cover are abutted with the stator assembly and the housing, which simplifies the assembly difficulty, is conducive to the different regions of the interval accommodating cavity, realizes the sealing of the stator assembly at the two ends of the axial direction of the housing, reduces the influence between the stator assembly and the rotor assembly, and is conducive to improving the operation stability of motor.

[0007] According to some embodiments of the utility model, one of the first end cover and the second end cover is provided with an oil outlet, the other of the first end cover and the second end cover is provided with an oil inlet, the stator assembly is provided with an oil channel, the oil channel is communicated with the oil inlet and the oil outlet, the shell is provided with a liquid inlet, a liquid outlet and a cooling liquid channel, and the cooling liquid channel is communicated with the liquid inlet and the liquid outlet.

[0008] According to some embodiments of the utility model, the motor further comprises a first sealing member arranged between the first protrusion and the stator assembly, and a second sealing member arranged between the second protrusion and the stator assembly.

[0009] According to some embodiments of the utility model, the length of the first protrusion in the axial direction of the shell is greater than the length of the second protrusion.

[0010] According to some embodiments of the utility model, one of the first end cover and the second end cover is provided with an oil outlet, the other of the first end cover and the second end cover is provided with an oil inlet, the stator assembly is provided with an oil channel, the oil channel is communicated with the oil inlet and the oil outlet, the shell is provided with a liquid inlet, a liquid outlet and a cooling liquid channel, and the cooling liquid channel is communicated with the liquid inlet and the liquid outlet.

[0011] According to some embodiments of the utility model, the oil outlet is arranged above the oil inlet in the radial direction of the shell.

[0012] According to some embodiments of the utility model, the oil channel comprises a first oil channel and a second oil channel, the second oil channel is arranged adjacent to the edge of the stator assembly, the first oil channel is arranged on one side of the first oil channel adjacent to the center of the shell, and the oil outlet and the oil inlet are arranged between the first oil channel and the second oil channel in the radial direction of the shell.

[0013] According to some embodiments of the utility model, the first oil channel and the second oil channel are both multiple, the multiple first oil channels and the multiple second oil channels are both spaced apart along the circumferential direction of the stator assembly, and each second oil channel is arranged between two adjacent first oil channels.

[0014] According to some embodiments of the present application, the first end cover, the shell and the stator assembly jointly define a first oil cavity, the second end cover, the shell and the stator assembly jointly define a second oil cavity, and an inner wall surface of the shell and an outer wall surface of the stator assembly jointly define a communication passage; wherein the communication passage is in communication with the first oil cavity and the second oil cavity at two ends respectively, the first oil cavity is in communication with the oil outlet, the oil passage and the communication passage, and the second oil cavity is in communication with the oil inlet, the oil passage and the communication passage.

[0015] According to some embodiments of the present application, the width of the communication passage in the radial direction of the shell gradually increases along the direction from the oil outlet to the oil inlet.

[0016] According to some embodiments of the present application, the cooling liquid passage extends along the axial direction of the shell, and the liquid inlet and the liquid outlet are both arranged on the outer side wall in the radial direction of the shell.

[0017] According to some embodiments of the present application, the cooling liquid passage extends along the axial direction of the shell in a spiral manner.

[0018] According to some embodiments of the present application, the stator assembly comprises: a stator core, the oil passage is formed on the stator core; a stator winding, the stator winding is wound on the stator core; and an insulation piece, the insulation piece is arranged on the stator core, the insulation piece separates the stator core and the stator winding, and separates the stator core and the rotor assembly, and the insulation piece is in abutment with the first end cover and the second end cover.

[0019] According to some embodiments of the present application, a plurality of wire winding grooves are formed on the stator core, and the plurality of wire winding grooves are spaced apart in the circumferential direction of the stator core; the insulation piece comprises a first insulation section and a second insulation section, the first insulation section covers the end surface in the axial direction of the stator core and the inner wall of the wire winding groove, and the second insulation section covers the inner wall of the stator core.

[0020] According to some embodiments of the present application, the first insulation section comprises: a plurality of first sub-insulation sections, the plurality of first sub-insulation sections correspond to the plurality of wire winding grooves one by one, and each first sub-insulation section is arranged in the corresponding wire winding groove; a second sub-insulation section, the second sub-insulation section is arranged on one side of the plurality of first sub-insulation sections adjacent to the oil inlet, and the shape of the second sub-insulation section is L-shaped; and a third sub-insulation section, the third sub-insulation section is arranged on one side of the plurality of first sub-insulation sections adjacent to the oil outlet, and the shape of the third sub-insulation section is Z-shaped.

[0021] The vehicle according to the second aspect of the present application comprises the motor according to the first aspect of the present application.

[0022] Additional aspects and advantages of the present utility model will be partially given in the following description, some will become apparent from the following description, or be understood through the practice of the present utility model. BRIEF DESCRIPTION OF DRAWINGS

[0023] The above and / or additional aspects and advantages of the present utility model will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

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

[0025] Figure 2 is a cross-sectional view of a motor according to an embodiment of the present utility model;

[0026] Figure 3 is a cross-sectional view of a stator assembly of a motor according to an embodiment of the present utility model;

[0027] Figure 4 is a schematic view of a stator core of a motor according to an embodiment of the present utility model;

[0028] Figure 5 is Figure 4 an enlarged view of A portion shown in the middle circle;

[0029] Figure 6 is a schematic view of an insulating member of a motor according to an embodiment of the present utility model;

[0030] Figure 7 is Figure 6 a schematic view of the insulating member from another angle shown in the middle circle;

[0031] Figure 8 is a cross-sectional view of a motor from another angle according to an embodiment of the present utility model;

[0032] Figure 9 is a cross-sectional view of a motor according to an embodiment of the present utility model, wherein a rotor assembly is not shown;

[0033] Figure 10 is a schematic view of a second end cover of a motor according to an embodiment of the present utility model;

[0034] Figure 11 is a schematic view of the second end cover of a motor from another angle according to an embodiment of the present utility model;

[0035] Figure 12 is a schematic view of a first end cover of a motor according to an embodiment of the present utility model;

[0036] Figure 13 is a schematic view of the first end cover of a motor from another angle according to an embodiment of the present utility model;

[0037] Figure 14 This is a schematic diagram of the housing of the motor according to an embodiment of the present utility model;

[0038] Figure 15 This is a schematic diagram of the coolant passage in the housing of an electric motor according to an embodiment of the present invention;

[0039] Figure 16 This is a schematic diagram of the first flow channel of the motor housing according to an embodiment of the present utility model;

[0040] Figure 17 yes Figure 16 Enlarged view of section B shown in the middle circle.

[0041] Figure label:

[0042] 100: Electric motor;

[0043] 1: Stator assembly; 11: Oil passage; 111: First oil passage; 112: Second oil passage; 12: Stator core; 13: Stator winding; 14: Insulator; 141: First insulation section; 1411: First sub-insulation section; 1412: Second sub-insulation section; 1413: Third sub-insulation section; 142: Second insulation section; 2: Rotor assembly; 3: Housing; 31: Receiving cavity; 32: Liquid inlet; 33: Liquid outlet; 34: Coolant passage; 4: First end cap; 41: First protrusion; 42: Oil outlet; 5: Second end cap; 51: Second protrusion; 52: Oil inlet; 6: First seal; 7: Second seal; 8: First oil chamber; 9: Second oil chamber; 10: Connecting channel. Detailed Implementation

[0044] The following is for reference. Figures 1-17 A motor 100 according to a first aspect embodiment of the present invention is described.

[0045] like Figures 1-17 As shown, the motor 100 according to the first aspect embodiment of the present invention includes a stator assembly 1, a rotor assembly 2, a housing 3, a first end cover 4, and a second end cover 5.

[0046] Specifically, the housing 3 has a receiving cavity 31, in which the stator assembly 1 and the rotor assembly 2 are disposed. A first end cover 4 is disposed at one axial end of the housing 3, and the first end cover 4 abuts against the stator assembly 1 and the housing 3 respectively. A second end cover 5 is disposed at the other axial end of the housing 3, and the second end cover 5 abuts against the stator assembly 1 and the housing 3 respectively.

[0047] For example, in Figure 1 and Figure 2In the example, along the axial direction of the shell 3, the first end cover 4 and the second end cover 5 are respectively arranged at the two ends of the stator assembly 1 and the shell 3, and the first end cover 4 and the second end cover 5 cooperate with the shell 3 to jointly define the accommodation cavity 31. The rotor assembly 2 is arranged at the center of the accommodation cavity 31 and extends along the axial direction of the shell 3, and the stator assembly 1 is sleeved on the outer periphery of the rotor assembly 2 and extends along the axial direction of the shell 3. The stator assembly 1 and the rotor assembly 2 jointly act as core components of the motor 100 to realize the conversion between electric energy and mechanical energy. The stator assembly 1 generates a magnetic field after being energized. The rotor assembly 2 can convert electric energy into mechanical energy through electromagnetic induction principle, or convert mechanical energy into electric energy in the power generation mode. For example, when the motor 100 operates, the magnetic field generated by the stator assembly 1 interacts with the magnetic poles on the rotor assembly 2 to generate an electromagnetic torque to drive the rotor to rotate.

[0048] The first end cover 4 and the second end cover 5 are in abutting fit with the stator assembly 1 and the shell 3, which simplifies the assembly difficulty, is beneficial to spacing different regions of the accommodation cavity 31, realizes the sealing of the stator assembly 1 at the two ends of the shell 3 in the axial direction, reduces the influence between the stator assembly 1 and the rotor assembly 2, and is beneficial to improving the operation stability of the motor 100.

[0049] In addition, referring to Figure 2 , the rotor assembly 2 is composed of a rotating shaft, a rotor core and a magnetic separation plate. The rotor core is fixed by a hot sleeve ring or a locking nut. The rotor assembly 2 is loaded into the accommodation cavity 31 through one side of the second end cover 5, and the shell 3 and the bearing chamber of the second end cover 5 support the high-speed rotation of the rotor assembly 2. The shell 3 and the second end cover 5 can support the rotor assembly 2 through bearings.

[0050] According to the motor 100 of the embodiment of the utility model, one of the first end cover 4 and the second end cover 5 is arranged at the two ends of the axial direction of the shell 3, the first end cover 4 and the second end cover 5 are in abutting fit with the stator assembly 1 and the shell 3, which simplifies the assembly difficulty, is beneficial to spacing different regions of the accommodation cavity 31, realizes the sealing of the stator assembly 1 at the two ends of the shell 3 in the axial direction, reduces the influence between the stator assembly 1 and the rotor assembly 2, and is beneficial to improving the operation stability of the motor 100.

[0051] According to some embodiments of the utility model, referring to Figure 1 and Figure 2 , combined with Figures 10-13The first end cover 4 is provided with a first protrusion 41 on the side facing the housing 3, which extends in the axial direction of the housing 3 towards the second end cover 5. The second end cover 5 is provided with a second protrusion 51 on the side facing the housing 3, which extends in the axial direction of the housing 3 towards the first end cover 4. In the radial direction of the housing 3, the first protrusion 41 and the second protrusion 51 are located on the side of the stator assembly 1 adjacent to the center of the housing 3, and the first protrusion 41 and the second protrusion 51 abut against the stator assembly 1.

[0052] When the first end cover 4 is fitted at one end in the axial direction of the housing 3, the first protrusion 41 abuts against the stator assembly 1 at the end facing the second end cover 5, i.e. the end of the first protrusion 41 away from the first end cover 4. Similarly, when the second end cover 5 is fitted at one end in the axial direction of the housing 3, the second protrusion 51 abuts against the stator assembly 1 at the end facing the first end cover 4, i.e. the end of the second protrusion 51 away from the second end cover 5. The first protrusion 41 and the second protrusion 51 are arranged on the side of the stator assembly 1 adjacent to the center of the housing 3, and on the side of the stator assembly 1 adjacent to the rotor assembly 2, so as to facilitate spacing the stator assembly 1 and the rotor assembly 2 by the first protrusion 41 and the second protrusion 51.

[0053] Further, referring to Figure 2 and Figure 3 The motor 100 further comprises a first sealing member 6 and a second sealing member 7. The first sealing member 6 is arranged between the first protrusion 41 and the stator assembly 1. The second sealing member 7 is arranged between the second protrusion 51 and the stator assembly 1. The first sealing member 6 can improve the sealing between the first protrusion 41 and the stator assembly 1. The second sealing member 7 can improve the sealing between the second protrusion 51 and the stator assembly 1. Thus, the arrangement of the first sealing member 6 and the second sealing member 7 facilitates improving the sealing of the space defined by the first end cover 4, the second end cover 5, the first protrusion 41, the second protrusion 51, the housing 3 and the stator assembly 1, and can further reduce the influence between the stator assembly 1 and the rotor assembly 2.

[0054] For example, the side of the first protrusion 41 facing the stator assembly 1 is formed with a first sealing groove for mounting the first sealing member 6, and the surface of the first sealing member 6 away from the first protrusion 41 is adapted to abut against the stator assembly 1. The side of the second protrusion 51 facing the stator assembly 1 is formed with a second sealing groove for mounting the second sealing member 7, and the surface of the second sealing member 7 away from the second protrusion 51 is adapted to abut against the stator assembly 1. The first sealing member 6 and the second sealing member 7 can both be sealing rings, and thus the radial sealing of the motor 100 is achieved by using the first sealing member 6 and the second sealing member 7.

[0055] According to some embodiments of the present utility model, the length of the first protrusion 41 is greater than the length of the second protrusion 51 in the axial direction of the shell 3. Thus, the lengths of the first protrusion 41 and the second protrusion 51 are different, which makes them suitable for cooperating with the stator assembly 1 in the accommodating cavity 31. The end of the stator assembly 1 cooperating with the first protrusion 41 can be arranged in the direction away from the end of the shell 3, and the end of the stator assembly 1 cooperating with the second protrusion 51 can be arranged at the end of the corresponding end of the shell 3. Thus, it is beneficial to realize the reliable spacing between the stator assembly 1 and the rotor assembly 2 according to the arrangement of the stator assembly 1.

[0056] According to some embodiments of the present utility model, one of the first end cover 4 and the second end cover 5 is formed with the oil outlet 42, and the other of the first end cover 4 and the second end cover 5 is formed with the oil inlet 52. Among them, when the first end cover 4 is formed with the oil outlet 42, the second end cover 5 is formed with the oil inlet 52 (as shown in Figure 2 ). Or, when the second end cover 5 is formed with the oil outlet 42, the first end cover 4 is formed with the oil inlet 52 (not shown in the figure). Referring to Figure 2 , the oil channel 11 is formed on the stator assembly 1, and the oil channel 11 communicates with the oil inlet 52 and the oil outlet 42. The shell 3 is formed with the liquid inlet 32, the liquid outlet 33 and the cooling liquid channel 34, and the cooling liquid channel 34 communicates with the liquid inlet 32 and the liquid outlet 33.

[0057] The arrangement of the oil channel 11 and the cooling liquid channel 34 optimizes the structure of the motor 100, reduces the difficulty of assembling the motor 100, reduces the production cost of the motor 100, and improves the cooling effect of the motor 100. The cooling oil can be directly introduced into the motor 100 to quickly cool the heat source of the motor 100. Specifically, the cooling oil can be directly introduced into the oil channel 11 on the stator assembly 1 to realize direct oil cooling of the stator assembly 1, thereby improving the power density, torque density and reliability of the motor 100. The liquid inlet 32 of the shell 3 can introduce cooling liquid, and the cooling liquid flows along the cooling liquid channel 34 and is then discharged along the liquid outlet 33. During the flow of the cooling liquid in the cooling liquid channel 34 of the shell 3, the temperature of the stator assembly 1 and the cooling oil can be quickly reduced, the efficiency of the motor 100 is improved, and the stable operation of the motor 100 is ensured. Compared with the traditional motor, the above motor 100 adopts the combination of oil cooling and liquid cooling, which improves the cooling effect of the electrode.

[0058] Further, referring to Figure 2The oil outlet 42 is arranged above the oil inlet 52 in the radial direction of the housing 3. The oil passage of a conventional motor adopts a high-inlet and low-outlet structure, which cannot fill the oil cavity completely. After the cooling oil is heated, it may float in the upper part of the oil passage 11, while the cooling oil flowing out of the bottom oil outlet 42 is relatively low in temperature. The oil inlet 52 and the oil outlet 42 of the motor 100 of the present application are designed according to the principle of low-inlet and high-outlet, which is beneficial to ensure that the closed oil passage 11 is filled with cooling oil, so that the stator assembly 1 can be fully immersed in the cooling oil for cooling.

[0059] Further, referring to Figure 2 and Figure 3 , the oil passage 11 comprises a first oil passage 111 and a second oil passage 112. The first oil passage 111 is arranged adjacent to the edge of the stator assembly 1, and the second oil passage 112 is arranged on one side of the first oil passage 111 adjacent to the center of the housing 3. In the radial direction of the housing 3, the oil outlet 42 and the oil inlet 52 are arranged between the first oil passage 111 and the second oil passage 112.

[0060] In the radial direction of the stator assembly 1, the second oil passage 112 and the first oil passage 111 are formed away from the center of the stator assembly 1, so that the cooling oil passing through the second oil passage 112 can effectively cool the central axis direction of the stator assembly 1, and the cooling oil passing through the first oil passage 111 can effectively cool the circumferential direction of the stator assembly 1. The arrangement of the oil outlet 42 and the oil inlet 52 is beneficial to reduce the distance between the first oil passage 111, the second oil passage 112 and the oil outlet 42 and the oil inlet 52, thereby improving the speed of the cooling oil entering the first oil passage 111 and the second oil passage 112, and improving the speed of the cooling oil flowing out of the first oil passage 111 and the second oil passage 112 from the oil outlet 42. Thus, the cooling effect near the central axis of the stator assembly 1 and near the circumferential direction of the stator assembly 1 is improved, the temperature difference near the central axis of the stator assembly 1 and near the circumferential direction of the stator assembly 1 is reduced, the use effect of the stator assembly 1 is improved, the internal oil pressure of the motor 100 is balanced, the path of the oil passage 11 of the electric drive system is shortened, and the oil resistance loss is reduced.

[0061] In addition, referring to Figures 4-6 , in combination with Figure 16 and Figure 17The first oil channel 111 and the second oil channel 112 are both multiple. In the description of the utility model, the meaning of "multiple" is two or more than two. The multiple first oil channels 111 and the multiple second oil channels 112 are spaced apart along the circumferential direction of the stator assembly 1. For example, the multiple first oil channels 111 and the multiple second oil channels 112 are formed by being spaced apart along the circumferential direction of the stator assembly 1, thereby facilitating the increase of the circulation path of the cooling oil and improving the cooling efficiency of the stator assembly 1. Each second oil channel 112 is arranged between two adjacent first oil channels 111. Along the circumferential direction of the stator assembly 1, the first oil channels 111 and the second oil channels 112 are arranged alternately, so that the cooling effect of the cooling oil in the first oil channel 111 and the cooling effect of the cooling oil in the second oil channel 112 are complementary to each other, thereby facilitating the reduction of the temperature difference at different positions of the stator assembly 1 and improving the operation stability of the stator assembly 1.

[0062] According to some embodiments of the utility model, referring to Figure 2 , Figure 3 and Figure 9 , the first end cover 4, the shell 3 and the stator assembly 1 jointly define a first oil cavity 8, the second end cover 5, the shell 3 and the stator assembly 1 jointly define a second oil cavity 9, and the inner wall surface of the shell 3 and the outer wall surface of the stator assembly 1 jointly define a communication passage 10. Wherein, the two ends of the communication passage 10 are communicated with the first oil cavity 8 and the second oil cavity 9 respectively, the first oil cavity 8 is communicated with the oil outlet 42, the oil channel 11 and the communication passage 10, and the second oil cavity 9 is communicated with the oil inlet 52, the oil channel 11 and the communication passage 10. Wherein, the cooling oil can enter the second oil cavity 9 through the oil inlet 52, the cooling oil in the second oil cavity 9 flows into the first oil cavity 8 through the communication passage 10 and the oil channel 11, and as the cooling oil in the first oil cavity 8 gradually increases, the oil amount of the cooling oil in the first oil cavity 8 gradually increases to the position of the oil outlet 42, at this time, the cooling oil flows out from the oil outlet 42, so that the heat exchange and cooling effect of the stator assembly 1 can be fully and effectively realized.

[0063] In detail, the cooling oil can quickly enter the first oil cavity 8 from the second oil cavity 9 through the oil channel 11 and the communication passage 10, so that the first oil cavity 8 and the second oil cavity 9 can be quickly filled, the circulation speed of the cooling oil is improved, the stator assembly 1 can be uniformly cooled, the cooling uniformity of the stator assembly 1 is improved, the oil pressure inside the motor 100 can be balanced, the oil channel 11 path of the electric drive system is shortened, and the oil resistance loss is reduced.

[0064] For example, the inner wall surface of the shell 3 is uniformly distributed with N axial extending communication channels 10, so that the cooling oil can flow on the inner wall surface of the shell 3, thereby quickly taking away the heat of the outer surface of the stator assembly 1. The width of the communication channel 10 at the bottom of the shell 3 (i.e. the length of the communication channel 10 in the radial direction of the stator assembly 1) is the largest and satisfies the following requirements: L1=360 / N+N / 2-2k, k is an integer, k=0 for the communication channel 10 at the bottom, and k increases by 1 for each increase of 1 of the communication channel 10 towards the top of the shell 3, k is selected from 0, 1, 2, 3, 4,..., and the maximum value of k is N / 2. The number N of communication channels 10 in the embodiment is 10, and the width of the communication channel 10 at the bottom is (360 / 10+10 / 2)°=41°. Since the cooling oil in the motor 100 flows from low to high, the width of the communication channel 10 at the bottom is the largest, which is beneficial to reducing the flow resistance of the motor 100 and better cooling the motor 100.

[0065] Further, with reference to Figure 15 , the width of the communication channel 10 in the radial direction of the shell 3 gradually increases in the direction from the oil outlet 42 to the oil inlet 52. Such an arrangement is beneficial to increasing the oil flow at the same time at the oil inlet 52, improving the oil intake of the cooling oil, and improving the oil pressure in the communication channel 10, thereby improving the flow rate of the cooling oil and the heat exchange cooling efficiency of the cooling oil.

[0066] According to some embodiments of the present application, with reference to Figures 1-3 , in combination with Figure 8 and Figure 9 , the cooling liquid channel 34 extends in the axial direction of the shell 3, and the liquid inlet 32 and the liquid outlet 33 are both arranged on the outer side wall in the radial direction of the shell 3. The cooling liquid channel 34 is composed of the first end cover 4, the shell 3 and the second end cover 5, and the first end cover 4 and the second end cover 5 seal the cooling liquid channel 34 of the shell 3. The cooling liquid channel 34 can quickly reduce the temperature of the cooling oil in the stator assembly 1 and the motor 100. After the cooling oil in the shell 3 exchanges heat with the stator assembly 1, the cooling oil continues to transfer part of the heat to the shell 3, and the cooling liquid can uniformly exchange heat and cool the shell 3 along the cooling liquid channel 34, thereby further taking away the heat of the shell 3, reducing the temperature of the motor 100, and improving the working efficiency of the motor 100.

[0067] For example, the housing 3 is formed with axially extending cooling liquid passages, so that the heat of the cooling oil in the housing 3 can be quickly and uniformly taken away, thereby improving the cooling efficiency and cooling uniformity. The housing 3 is processed by extrusion stretching in the form of the axially extending cooling liquid passages 34, so that the processing allowance is small, the cost is low, the development can be platformed, and the development cycle and cost are effectively reduced; and the cooling liquid passages 34 are axial water channels, so that the housing 3 can be stretched, the price is cheap, the manufacturing is convenient, the low-pressure casting can be used for processing, the cooling flow resistance is small, and the heat dissipation effect is better.

[0068] For example, the housing 3 is formed with axially extending cooling liquid passages, so that the heat of the cooling oil in the housing 3 can be quickly and uniformly taken away, thereby improving the cooling efficiency and cooling uniformity. The housing 3 is processed by extrusion stretching in the form of the axially extending cooling liquid passages 34, so that the processing allowance is small, the cost is low, the development can be platformed, and the development cycle and cost are effectively reduced; and the cooling liquid passages 34 are axial water channels, so that the housing 3 can be stretched, the price is cheap, the manufacturing is convenient, the low-pressure casting can be used for processing, the cooling flow resistance is small, and the heat dissipation effect is better.

[0069] Further, the cooling liquid passages 34 extend helically along the axial direction of the housing 3. The cooling liquid can flow helically along the circumferential direction of the housing 3, so that the heat exchange between the cooling liquid and the housing 3 is more sufficient and comprehensive, the heat exchange uniformity of the cooling liquid and the housing 3 is improved, the problem of local overheating of the housing 3 is avoided, and the cooling effect of the motor 100 is improved. In addition, the helical cooling liquid passages 34 can be processed by low-pressure casting, the cooling flow resistance is small, and the heat dissipation is good.

[0070] According to some embodiments of the present application, referring to Figure 2 , Figure 3 , Figure 7 and Figure 9 , the stator assembly 1 comprises a stator core 12, a stator winding 13 and an insulation piece 14. The stator core 12 is formed with an oil channel 11, and the stator winding 13 is wound on the stator core 12. The insulation piece 14 is arranged on the stator core 12, and the insulation piece 14 separates the stator core 12 and the stator winding 13, and separates the stator core 12 and the rotor assembly 2, and the insulation piece 14 abuts against the first end cover 4 and the second end cover 5. The stator core 12 forms a closed magnetic circuit when the motor 100 operates, so that the magnetic field generated by the stator winding 13 can be effectively transmitted to the rotor assembly 2, that is, when the current passes through the stator winding 13, a rotating magnetic field is generated, which interacts with the rotor assembly 2 to drive the rotor assembly 2 to operate. The insulation piece 14 separates the stator assembly 1 and the rotor assembly 2, so that the cooling oil does not come into contact with the rotor core of the high-speed rotating rotor assembly 2 to generate oil stirring loss, thereby facilitating to ensure the efficiency of the motor 100.

[0071] The insulation piece 14 adopts a radial sealing mode, which is beneficial to avoid the influence of large machining and assembly tolerance of each part of the motor 100 on the sealing effect, and improve the reliability of the motor 100. The shell 3 is fixed and supported by interference fit with the stator core 12, and the bottom of the shell 3 can be designed to have a step to position the axial distance of the stator core 12 and the rotor core.

[0072] The material of the insulation piece 14 can be PPS (polyphenylene sulfide) + GF30 (glass fiber), carbon fiber reinforced synthetic resin matrix or ceramic composite material, which has good heat resistance, electrical properties, mechanical properties, flame retardance and chemical properties, and can be coated on the stator core 12 by injection molding.

[0073] In addition, the stator core 12 of the motor 100 is formed by stacking a plurality of stator punching sheets, and at least one smaller first oil channel 111 is formed in the tooth portion of each stator punching sheet, so that the cooling oil can quickly pass through the first oil channel 111 and the second oil channel 112 formed by the stator core 12 from the second oil cavity 9 into the first oil cavity 8. Therefore, the oil circuit can be quickly filled and the stator core 12 and the stator winding 13 can be uniformly cooled, the internal oil pressure of the motor 100 can be balanced, the oil channel 11 path of the electric drive system can be shortened, and the oil resistance loss can be reduced.

[0074] The first oil channel 111 formed by the plurality of stator punching sheets is a straight slot oil channel, which can also be a honeycomb oil channel. The number of oil holes corresponding to the first oil channel 111 on the circumference of the stator core 12 is odd, and the oil holes of adjacent stator cores 12 are staggered to form a honeycomb shape. Therefore, the cooling effect of the stator core 12 is more uniform and better.

[0075] Further, a plurality of winding grooves are formed on the stator core 12, and the winding grooves are spaced apart along the circumferential direction of the stator core 12. The main function of the winding groove is to provide a fixed mounting position for the stator winding 13, so as to ensure that the stator winding 13 can tightly fit the stator core 12 and remain stable during the operation of the motor 100. The reasonable arrangement of the plurality of winding grooves is beneficial to optimize the magnetic flux path, reduce the magnetic resistance, and thus improve the efficiency and performance of the motor 100.

[0076] A plurality of uniformly distributed winding grooves are formed in the stator core 12, and the winding grooves are filled with the stator winding 13. After the three-phase alternating current in the stator winding 13 is input, a rotating magnetic field is generated to drive the rotor assembly 2 to rotate at high speed. The three-phase alternating current in the stator winding 13 needs to be insulated from the stator core 12 by the insulation piece 14 to ensure normal operation of the motor 100. The insulation piece 14 can be wrapped around the slot opening of the stator core 12 and the two axial ends of the stator core 12, so that the motor insulation paper and the slot wedge can be omitted, the insulation performance between the stator winding 13 and the stator core 12 can be ensured, and the assembly is simple and reliable.

[0077] For example, the insulating piece 14 can be formed on the stator core 12 to cover the inner surface, the upper and lower surfaces and the winding slots of the stator core 12. The insulating piece 14 is in abutment with the first end cover 4 and the second end cover 5. A closed oil cavity is formed by the cooperation of the insulating piece 14 and the first end cover 4 and the second end cover 5 to soak the heated stator core 12. The insulating piece 14 can also isolate the high-speed rotating rotor assembly 2. The insulating piece 14 has a simple and reliable structure, and has a lower cost and a lower assembly difficulty compared with the insulating paper.

[0078] With reference to Figure 2 、 Figure 3 、 Figure 7 and Figure 9 , the insulating piece 14 includes a first insulating section 141 and a second insulating section 142. The first insulating section 141 covers the axial end surface of the stator core 12 and the inner wall of the winding slot. The second insulating section 142 covers the inner wall of the stator core 12. The first insulating section 141 is beneficial to the insulation between the stator core 12 and the stator winding, and ensures that the stator winding 13 and the stator core 12 will not be short-circuited, effectively reduces the internal leakage current of the motor 100, and further reduces the energy loss and improves the efficiency of the motor 100. The second insulating section 142 is beneficial to form a barrier to isolate the stator core 12 from the stator winding 13. This arrangement helps to ensure the insulation effect between the stator winding 13 and the stator core 12, and does not hinder the installation and cooling of the stator winding 13.

[0079] Further, with reference to Figure 2 、 Figure 3 、 Figure 7 and Figure 9The first insulation section 141 includes a plurality of first sub-insulation sections 1411, a second sub-insulation section 1412, and a third sub-insulation section 1413. The plurality of first sub-insulation sections 1411 correspond one-to-one with the plurality of wire grooves, and each first sub-insulation section 1411 is arranged in a corresponding wire groove. The second sub-insulation section 1412 is arranged on a side of the plurality of first sub-insulation sections 1411 adjacent to the oil inlet 52, and the second sub-insulation section 1412 has an L-shaped structure. The third sub-insulation section 1413 is arranged on a side of the plurality of first sub-insulation sections 1411 adjacent to the oil outlet 42, and the third sub-insulation section 1413 has a Z-shaped structure. The first sub-insulation sections 1411 insulate and protect the wire grooves. The second sub-insulation section 1412 is arranged on an end of the stator core 12 adjacent to the second end cover 5, i.e., the second sub-insulation section 1412 is arranged on the U-shaped end of the stator winding 13, and the U-shaped end is designed in a straight line, facilitating the rotor assembly 2 to be loaded into the accommodating cavity 31 from an end of the housing 3 adjacent to the second end cover 5. The third sub-insulation section 1413 is arranged on an end of the stator core 12 adjacent to the first end cover 4. The length of the third sub-insulation section 1413 parallel to the extension direction of a segment of the first protrusion 41 is less than the length of the stator winding 13 in the extension direction of the first protrusion 41, so that the end of the stator winding 13 towards the first end cover 4 can be used as a welding end coated with epoxy resin powder to increase the insulation of the stator winding 13, and avoid the epoxy resin powder adhering to the insulation piece 14, affecting the sealing of the first oil cavity 8 and the second oil cavity 9. The epoxy resin powder can provide an effective electrical insulation barrier to prevent short circuit arc discharge, thereby protecting the welding end from current impact; the hardened epoxy resin after coating forms a solid shell, enhancing the mechanical strength of the welding end and reducing the risk of damage due to vibration or physical impact; the epoxy resin has good chemical resistance and moisture resistance, effectively resisting the erosion of moisture, salt mist, and other corrosive substances in the environment on the welding end.

[0080] In summary, when the cooling oil flows into the second oil cavity 9 from the oil inlet 52 at the bottom of the motor 100, the U-shaped end of the stator winding 13 and the stator core 12 are cooled. The cooling oil in the second oil cavity 9 enters the first oil cavity 8 through the first oil channel 111, the second oil channel 112 formed by the stator core 12 and the communication channel 10 on the inner surface of the shell 3, fully cools the inside of the stator core 12, the outer surface of the stator core 12 and the stator winding 13, and balances the pressure and the liquid level of the cooling oil between the first oil cavity 8 and the second oil cavity 9, so that the stator assembly 1 is fully cooled. The cooling oil in the first oil cavity 8 can cool the welded end of the stator winding 13 and the stator core 12. When the cooling oil fills the second oil cavity 9 and the first oil cavity 8, the heated cooling oil will float on top of the oil channel 11 of the motor 100, and the heated cooling oil at the top of the motor 100 will flow out quickly through the oil outlet 42. The cooling liquid flowing through the cooling liquid channel 34 in the shell 3 of the motor 100 can circulate to reduce the temperature of the stator assembly 1 of the motor 100 and the cooling oil in the first oil cavity 8 and the second oil cavity 9.

[0081] The insulation member 14 plastic-sealed to the inner surface of the stator core 12 is kept a certain distance from the outer surface of the rotor assembly 2 to protect the rotor assembly 2 and prevent the cooling oil from stirring the rotor assembly 2 rotating at high speed, thereby reducing the working efficiency of the motor 100. The insulation member 14 on the inner wall of the stator core 12 insulates the stator core 12 from the stator winding 13, improves the ground insulation performance of the stator winding 13, ensures the safe and reliable operation of the motor 100 under high voltage and large current, and eliminates the complicated process of inserting insulation paper and slot wedge on the production line, thereby avoiding the risk of poor insulation caused by damage to the motor insulation paper and slot wedge. After the insulation member 14 is arranged on the axial end surface of the stator core 12, the insulation member 14 can be prevented from moving and the stator core 12 can be prevented from cracking, and the height of the end portion of the stator winding 13 can be reduced. Since the two end surfaces on the stator core 12 and the winding slot are covered with the insulation member 14, the linear height of the stator winding 13 extending out of the stator core 12 is reduced.

[0082] The motor 100 of the present patent optimizes the structure of the motor 100, reduces the difficulty of assembling the motor 100, reduces the production and material costs of the motor 100, improves the cooling effect of the motor 100, and the cooling oil is introduced into the motor 100, and the cooling water is introduced into the shell 3 to quickly cool the heat source of the motor 100, improve the heat dissipation capacity of the motor 100, and ensure the stable operation of the motor 100. The insulation member 14 is used to improve the insulation performance of the motor 100, meet the requirements of the new energy vehicles in terms of endurance, high voltage and small size.

[0083] According to the vehicle (not shown in the figure) of the second aspect of the present application, the motor 100 is according to the first aspect of the present application.

[0084] According to the vehicle of the utility model embodiment, by adopting the motor 100, the operation stability of the motor 100 is improved, the operation stability of the vehicle is improved, the noise of the motor 100 in the operation of the vehicle is reduced, thereby the use experience of the vehicle is improved, and the market competitiveness of the vehicle is improved.

[0085] Other configurations and operations of the vehicle according to the utility model embodiment are known to those skilled in the art, and will not be described in detail here.

[0086] In the description of the utility model, it is understood that the orientation or positional relationship indicated by the terms "center", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.

[0087] In the description of the present application, it should be explained that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected, it can be mechanical connection, or electrical connection, it can be directly connected, or indirectly connected through an intermediate medium, it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0088] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "illustrative embodiment", "example", "specific example" 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 utility model. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example.

[0089] Although the embodiments of the utility model have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and purposes of the utility model, and the scope of the utility model is defined by the claims and their equivalents.

Claims

1. An electric machine (100), characterized in that Comprise: A stator assembly (1) and a rotor assembly (2); A housing (3) having a containing cavity (31), the stator assembly (1) and the rotor assembly (2) are arranged in the containing cavity (31); A first end cover (4) arranged at one axial end of the housing (3), the first end cover (4) is abutted with the stator assembly (1) and the housing (3) respectively; A second end cover (5) arranged at the other axial end of the housing (3), the second end cover (5) is abutted with the stator assembly (1) and the housing (3) respectively.

2. The electric machine (100) of claim 1, characterized in that The first end cover (4) is provided with a first protrusion (41) on one side of the housing (3), the first protrusion (41) extends in the axial direction of the housing (3) towards the second end cover (5); The second end cover (5) is provided with a second protrusion (51) on one side of the housing (3), the second protrusion (51) extends in the axial direction of the housing (3) towards the first end cover (4); Wherein, in the radial direction of the housing (3), the first protrusion (41) and the second protrusion (51) are located on one side of the stator assembly (1) adjacent to the center of the housing (3), and the first protrusion (41) and the second protrusion (51) are abutted with the stator assembly (1).

3. The electric machine (100) of claim 2, characterized in that Also comprise: A first sealing member (6) arranged between the first protrusion (41) and the stator assembly (1); A second sealing member (7) arranged between the second protrusion (51) and the stator assembly (1).

4. The electric machine (100) of claim 2, characterized in that, The length of the first protrusion (41) in the axial direction of the housing (3) is greater than the length of the second protrusion (51).

5. The electric machine (100) of claim 1, characterized in that, One of the first end cover (4) and the second end cover (5) is formed with an oil outlet (42), the other of the first end cover (4) and the second end cover (5) is formed with an oil inlet (52), the stator assembly (1) is formed with an oil channel (11), the oil channel (11) is in communication with the oil inlet (52) and the oil outlet (42); The housing (3) is formed with a liquid inlet (32), a liquid outlet (33) and a cooling liquid passage (34), the cooling liquid passage (34) is in communication with the liquid inlet (32) and the liquid outlet (33).

6. The electric machine (100) of claim 5, characterized in that In the radial direction of the housing (3), the oil outlet (42) is arranged above the oil inlet (52).

7. The electric machine (100) of claim 6, characterized in that The oil channel (11) comprises a first oil channel (111) and a second oil channel (112), the first oil channel (111) is arranged adjacent to the edge of the stator assembly (1), and the second oil channel (112) is arranged on one side of the first oil channel (111) adjacent to the center of the housing (3); In the radial direction of the housing (3), the oil outlet (42) and the oil inlet (52) are arranged between the first oil channel (111) and the second oil channel (112).

8. The electric machine (100) of claim 7, characterized in that, The first oil channels (111) and the second oil channels (112) are multiple, the multiple first oil channels (111) and the multiple second oil channels (112) are spaced apart along the circumference of the stator assembly (1), and each second oil channel (112) is arranged between two adjacent first oil channels (111).

9. The electric machine (100) of claim 6, characterized in that, The first end cover (4), the shell (3) and the stator assembly (1) jointly define a first oil cavity (8), the second end cover (5), the shell (3) and the stator assembly (1) jointly define a second oil cavity (9), and the inner wall surface of the shell (3) and the outer wall surface of the stator assembly (1) jointly define a communication passage (10); The two ends of the communication passage (10) are in communication with the first oil cavity (8) and the second oil cavity (9) respectively, the first oil cavity (8) is in communication with the oil outlet (42), the oil channel (11) and the communication passage (10), and the second oil cavity (9) is in communication with the oil inlet (52), the oil channel (11) and the communication passage (10).

10. The electric machine (100) of claim 9, characterized in that, The width of the communication passage (10) in the radial direction of the shell (3) gradually increases in the direction from the oil outlet (42) to the oil inlet (52).

11. The electric machine (100) of claim 6, characterized in that, The cooling liquid channel (34) extends in the axial direction of the shell (3), and the liquid inlet (32) and the liquid outlet (33) are arranged on the outer side wall in the radial direction of the shell (3).

12. The electric machine (100) of claim 11, characterized in that, The cooling liquid channel (34) extends in the axial direction of the shell (3) in a spiral manner.

13. The electric machine (100) of claim 5, characterized in that, The stator assembly (1) comprises: A stator core (12) on which the oil channel (11) is formed; A stator winding (13) wound on the stator core (12); An insulation member (14) arranged on the stator core (12), the insulation member (14) insulating the stator core (12) and the stator winding (13), and the stator core (12) and the rotor assembly (2), and the insulation member (14) abutting against the first end cover (4) and the second end cover (5).

14. The electric machine (100) of claim 13, characterized in that, The stator core (12) is provided with a plurality of wire grooves spaced apart along the circumference of the stator core (12); The insulation member (14) comprises a first insulation section (141) and a second insulation section (142), the first insulation section (141) covering the axial end face of the stator core (12) and the inner wall of the wire groove, and the second insulation section (142) covering the inner wall of the stator core (12).

15. The electric machine (100) of claim 14, characterized in that, The first insulation section (141) comprises: A plurality of first sub-insulation sections (1411) corresponding to the plurality of wire grooves, each first sub-insulation section (1411) being arranged in a corresponding wire groove; A second sub-insulation section (1412) arranged on one side of the plurality of first sub-insulation sections (1411) adjacent to the oil inlet (52), the second sub-insulation section (1412) being L-shaped in shape; A third sub-insulating section (1413) is provided on one side of the first sub-insulating sections (1411) adjacent to the oil outlet (42), and the third sub-insulating section (1413) is Z-shaped.

16. A vehicle characterized by comprising: An electric machine (100) comprising a stator (10) according to any one of claims 1-15.

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