Cooling structure of motor, motor and vehicle

Abstract

The invention provides a cooling structure of a motor, the motor and a vehicle, the cooling structure of the motor comprises a shell, the shell wall of the shell is provided with a liquid inlet hole penetrating through the wall thickness and a wall hole penetrating through part of the wall thickness, and the shell wall of the shell is internally provided with a shell liquid path communicated with the wall hole; the liquid inlet hole is used for being communicated with a first liquid hole formed in a stator iron core of the motor, and the casing liquid path is used for being communicated with a second liquid hole formed in the stator iron core of the motor; the wall hole is opposite to an end winding of a stator assembly in the motor, the wall hole is used for providing cooling liquid for the end winding, and / or the wall hole is opposite to a shaft side of a rotor assembly of the motor, and the wall hole is used for providing cooling liquid for the rotor assembly.

Description

Technical Field

[0001] The present application belongs to the technical field of power equipment, and more specifically, relates to a cooling structure of a motor, a motor and a vehicle. Background Art

[0002] As the vehicle's power motor develops towards high efficiency and high power density, the cooling efficiency of the stator and rotor inside the motor is also improved simultaneously, especially for new energy vehicles, such as coaxial oil-cooled motors or coaxial water-oil mixed cooling motors.

[0003] In some related technologies, the oil cooling structure of the motor introduces coolant, and the coolant is sprayed directly onto the end winding. The direct spraying scheme cannot cool the entire stator assembly, resulting in low heat dissipation efficiency of the stator assembly and complicating the internal structure of the motor. Alternatively, an oil ring mechanism is provided on the periphery of the end winding, and the coolant is sprayed onto the end winding through the oil ring mechanism. Alternatively, the coolant is directly transported to the inside of the rotor core through the axial hole of the rotor shaft to cool the magnetic steel of the rotor core, and the stator assembly is cooled through another independent liquid path, which complicates the internal structure of the motor. Alternatively, the coolant is transported through the gap between the rotor shaft and the drive shaft. Since the gap between the rotor shaft and the drive shaft is very small, it is difficult for the coolant to enter the gap, and the relative rotation between the rotor shaft and the drive shaft will generate additional oil stirring loss, which leads to low cooling efficiency. Summary of the invention

[0004] The purpose of the embodiments of the present application is to provide a cooling structure of a motor, a motor and a vehicle to solve the technical problems of low cooling efficiency and complex structure of existing motors.

[0005] To achieve the above purpose, the technical solution adopted in this application is:

[0006] Provided is a cooling structure for a motor, comprising a casing, wherein a casing wall of the casing is provided with a liquid inlet hole penetrating through the wall thickness and a wall hole penetrating through part of the wall thickness, and a casing liquid path communicating with the wall hole is provided inside the casing wall of the casing;

[0007] The liquid inlet hole is used to communicate with a first liquid hole provided on the stator core of the motor, and the casing liquid path is used to communicate with a second liquid hole provided on the stator core of the motor;

[0008] The wall hole is opposite to the end winding of the stator assembly in the motor, and is used to provide cooling liquid to the end winding, and / or the wall hole is opposite to the axial side of the rotor assembly of the motor, and is used to provide cooling liquid to the rotor assembly.

[0009] In some embodiments, the shell wall includes a peripheral side wall for being arranged on the outer side of the stator assembly;

[0010] The casing liquid circuit includes a first liquid circuit, the wall hole includes a first wall hole, the liquid inlet hole and the first liquid circuit are spaced apart along the axial direction, the liquid inlet hole, the first liquid circuit and the first wall hole are arranged on the circumferential side wall, and the first wall hole is used to be opposite to the outer side surface of the end winding along the radial direction of the motor and provide cooling liquid to the outer side surface of the end winding.

[0011] In some embodiments, the shell wall includes an axial side wall connected to the axial side of the peripheral side wall;

[0012] The casing liquid circuit includes a second liquid circuit connected to the first liquid circuit, the wall hole includes a second wall hole connected to the second liquid circuit, the second liquid circuit and the second wall hole are arranged on the shaft side wall, and the second wall hole is used to be opposite to the shaft side of the end winding along the axial direction of the motor and provide cooling liquid to the shaft side of the end winding.

[0013] In some embodiments, the shell wall includes a peripheral side wall for being arranged on the outer side of the stator assembly, and an axial side wall connected to the axial side of the peripheral side wall; the liquid inlet hole is arranged on the peripheral side wall, and the casing liquid path includes a third liquid path arranged on the axial side wall and connected to the second liquid hole;

[0014] The third fluid path is used to communicate with the first fluid path hole of the rotor assembly and the magnetic steel fluid path.

[0015] In some embodiments, the shell wall includes an oil guide portion provided on the shaft side wall and integrally formed with the shaft side wall, and the casing liquid circuit includes a fourth liquid circuit provided on the oil guide portion, and the fourth liquid circuit connects the third liquid circuit and the first liquid guide hole.

[0016] In some embodiments, the liquid inlet hole is provided at the center position of the housing in the axial direction, and the liquid inlet hole is used to be coaxially connected with the first liquid hole in the radial direction; the stator core is provided with two second liquid holes, and the two second liquid holes are symmetrically provided on both sides of the first liquid hole along the axial direction of the motor;

[0017] The casing is provided with two groups of casing fluid paths and two groups of wall holes which are symmetrically arranged along the axial direction on both sides of the stator assembly or the rotor assembly.

[0018] In some embodiments, the casing includes an outer shell and an inner shell that are stacked, and the liquid inlet hole penetrates the wall thickness of the outer shell and the wall thickness of the inner shell; the casing liquid path is arranged between the outer shell and the inner shell, and the wall hole penetrates the wall thickness of the inner shell.

[0019] In some embodiments, the housing includes a circumferential side wall for being arranged on the outer side surface of the stator assembly, and two axial side walls respectively connected to two axial sides of the circumferential side wall, one of the axial side walls is integrally formed with the circumferential side wall, and the other axial side wall is detachably connected to the circumferential side wall.

[0020] The cooling structure of the motor provided by the present application has the following beneficial effects:

[0021] Compared with the prior art, the cooling structure of the motor provided in the present application is characterized in that the shell wall of the motor casing is provided with a liquid inlet hole penetrating the wall thickness and a wall hole penetrating part of the wall thickness, the shell wall of the casing is provided with a casing liquid path connected to the wall hole, the external coolant enters the interior of the motor through the liquid inlet hole and cools the motor, the liquid inlet hole can be connected to the first liquid hole of the stator core, the coolant can enter the stator liquid path to cool the stator core, the second liquid hole of the stator core is connected to the casing liquid path, and the coolant passing through the stator core enters the casing liquid path.

[0022] Among them, the wall hole connected to the casing liquid circuit is used to be opposite to the end winding and to provide cooling liquid to the end winding, and the cooling liquid passing through the stator core is provided to the end winding. In this way, the casing liquid circuit and wall holes provided on the casing are used to guide the cooling liquid from the stator liquid circuit to the end winding. Compared with the solution of directly spraying the cooling liquid to the end winding, the stator core and the end winding of the stator assembly can be fully cooled, thereby improving the cooling efficiency. The casing liquid circuit and wall holes provided on the casing are used to replace the existing oil ring mechanism provided on the outside of the end winding, which reduces the internal components of the motor and simplifies the internal structure of the motor.

[0023] Alternatively, the wall hole connected to the casing liquid circuit is used to be opposite to the axial side of the rotor assembly and to provide coolant to the rotor assembly, and the coolant passing through the stator core is provided to the rotor assembly. In this way, the casing liquid circuit and the wall hole provided on the casing are used to lead the coolant from the stator liquid circuit to the rotor assembly. Compared with the solution in which two cooling liquids are provided to the stator core and the rotor assembly respectively, the stator core and the rotor assembly can be fully cooled, thereby improving the cooling efficiency, and the coolant provided by the liquid inlet hole can be provided to the stator core and the rotor assembly in one go, simplifying the liquid circuit structure inside the motor, thereby simplifying the overall structure of the motor. In addition, compared with the coolant being transported through the gap between the rotor shaft and the drive shaft, the design dimensions of the casing liquid circuit and the wall hole on the casing are not restricted, and there is no oil stirring loss caused by relative rotation, thereby improving the cooling efficiency.

[0024] Alternatively, the wall hole connected to the casing liquid path is used to be opposite to the end winding and used to provide cooling liquid to the end winding, and is opposite to the shaft side of the rotor assembly and used to provide cooling liquid to the rotor assembly, and the cooling liquid passing through the stator core is provided to the end winding and the rotor assembly. In this way, the casing liquid path and the wall hole provided on the casing are used to guide the cooling liquid from the stator liquid path to the end winding and the rotor assembly, so that all structures of the stator and rotor can be fully cooled along the way, thereby improving the cooling efficiency.

[0025] Another object of the present application is to provide a motor, comprising a housing as claimed in any one of claims 1 to 8, and a stator assembly and a rotor assembly;

[0026] The housing is sleeved on the rotor assembly, and the stator assembly is arranged inside the housing and sleeved between the housing and the rotor assembly;

[0027] The stator assembly comprises a stator core and an end winding arranged in the axial direction, wherein the stator core is provided with a first liquid hole and a second liquid hole spaced apart in the axial direction, and a stator liquid path connecting the first liquid hole and the second liquid hole;

[0028] The liquid inlet hole of the casing is connected to the first liquid hole, the second liquid hole is connected to the casing liquid circuit, the wall hole is opposite to the end winding and is used to provide cooling liquid to the end winding, and / or the wall hole is opposite to the axial side of the rotor assembly and is used to provide cooling liquid to the rotor assembly.

[0029] In some embodiments, the shell wall includes a peripheral side wall provided on the outer side of the stator assembly;

[0030] The casing liquid circuit includes a first liquid circuit, the wall hole includes a first wall hole, the liquid inlet hole and the first liquid circuit are spaced apart along the axial direction of the motor, the liquid inlet hole, the first liquid circuit and the first wall hole are arranged on the peripheral side wall, the first wall hole and the outer side surface of the end winding are opposite to each other along the radial direction of the motor and are used to provide cooling liquid to the outer side surface of the end winding.

[0031] In some embodiments, the shell wall includes an axial side wall connected to the axial side of the peripheral side wall, and the stator assembly and the axial side wall are arranged along the axial direction;

[0032] The casing liquid circuit includes a second liquid circuit connected to the first liquid circuit, the wall hole includes a second wall hole connected to the second liquid circuit, the second liquid circuit and the second wall hole are arranged on the shaft side wall, the second wall hole and the shaft side of the end winding are opposite to each other along the axial direction of the motor and are used to provide cooling liquid to the shaft side of the end winding.

[0033] In some embodiments, the shell wall includes a peripheral side wall provided on the outer side of the stator assembly, and an axial side wall connected to the axial side of the peripheral side wall; the liquid inlet hole is provided on the peripheral side wall, and the casing liquid path includes a third liquid path provided on the axial side wall and connected to the second liquid hole;

[0034] The rotor assembly includes a rotor shaft and a first balance plate and a rotor core respectively sleeved on the rotor shaft. The first balance plate is provided with a first liquid guide hole penetrating the plate thickness along the axial direction of the motor. The interior of the rotor core is provided with a magnetic steel liquid path penetrating along the axial direction. The third liquid path, the first liquid guide hole and the magnetic steel liquid path are connected.

[0035] In some embodiments, the rotor assembly includes a second balancing plate, the rotor core is disposed between the first balancing plate and the second balancing plate; the magnetic steel liquid circuit has an inlet side and an outlet side disposed in opposite directions along the axial direction, and the first liquid guide hole is connected to the inlet side;

[0036] The second balancing plate is provided with a second liquid guide hole penetrating part of the plate thickness along the axial direction, and a liquid throwing hole connecting the second liquid guide hole and the outer side surface of the second balancing plate, the second liquid guide hole is connected to the lead-out side, the liquid throwing hole and the inner side surface of the end winding are radially opposite and are used to provide cooling liquid to the inner side surface of the end winding.

[0037] In some embodiments, the first balancing plate and the second balancing plate are arranged in the same manner, and are respectively provided with a plurality of the first liquid guide holes, a plurality of the second liquid guide holes and a plurality of the liquid throwing holes; the stator assembly comprises two end windings arranged on two axial sides of the stator core;

[0038] In the first balancing plate or the second balancing plate, a plurality of the first liquid guiding holes and a plurality of the second liquid guiding holes are alternately arranged along the circumferential direction of the motor, and a plurality of the second liquid guiding holes and a plurality of the liquid-swinging holes are connected one-to-one; in the first balancing plate and the second balancing plate, the first liquid guiding holes in one and the second liquid guiding holes in the other are opposite to each other along the axial direction, and the liquid-swinging holes in both are opposite to the inner side surfaces of the two end windings along the radial direction respectively.

[0039] In some embodiments, the shell wall includes an oil guide portion disposed between the shaft side wall and the first balance plate and integrally formed with the shaft side wall, and the casing liquid circuit includes a fourth liquid circuit disposed on the oil guide portion, and the fourth liquid circuit connects the third liquid circuit and the first liquid guide hole.

[0040] In some embodiments, the stator core is provided with two second liquid holes, and the two second liquid holes are provided on both sides of the first liquid hole along the axial direction;

[0041] A cooling water path is provided inside the shell wall, the cooling water path is arranged around the circumference of the shell, the cooling water path and the stator fluid path are arranged in a radially stacked manner, and the radially inward projection of the cooling water path covers the stator fluid path.

[0042] The beneficial effects of the motor provided by the present application are:

[0043] Compared with the prior art, the motor provided in the present application has a shell wall of the motor casing provided with a liquid inlet hole penetrating the wall thickness and a wall hole penetrating part of the wall thickness, a shell wall of the casing provided with a casing liquid path connected to the wall hole, external coolant enters the interior of the motor through the liquid inlet hole and cools the motor, the first liquid hole is connected to the liquid inlet hole, the coolant enters the stator liquid path to cool the stator core, the second liquid hole is connected to the casing liquid path, and the coolant passing through the stator core enters the casing liquid path.

[0044] Among them, the wall hole connected to the casing liquid circuit is opposite to the end winding and is used to provide cooling liquid to the end winding, and the cooling liquid passing through the stator core is provided to the end winding. In this way, the casing liquid circuit and wall holes provided on the casing are used to guide the cooling liquid from the stator liquid circuit to the end winding. Compared with the solution of directly spraying the cooling liquid to the end winding, the stator core and the end winding of the stator assembly can be fully cooled, thereby improving the cooling efficiency. The casing liquid circuit and wall holes provided on the casing are used to replace the existing oil ring mechanism provided on the outside of the end winding, which reduces the internal components of the motor and simplifies the internal structure of the motor.

[0045] Alternatively, the wall hole connected to the casing liquid circuit is opposite to the axial side of the rotor assembly and is used to provide coolant to the rotor assembly, and the coolant passing through the stator core is provided to the rotor assembly. In this way, the casing liquid circuit and the wall hole provided on the casing are used to lead the coolant from the stator liquid circuit to the rotor assembly. Compared with the solution in which two cooling liquids are provided to the stator core and the rotor assembly respectively, the stator core and the rotor assembly can be fully cooled, thereby improving the cooling efficiency, and the coolant provided by the liquid inlet hole can be provided to the stator core and the rotor assembly in one go, simplifying the liquid circuit structure inside the motor, thereby simplifying the overall structure of the motor. In addition, compared with the coolant being transported through the gap between the rotor shaft and the drive shaft, the design dimensions of the casing liquid circuit and the wall hole on the casing are not restricted, and there is no oil stirring loss caused by relative rotation, thereby improving the cooling efficiency.

[0046] Alternatively, the wall hole connected to the casing liquid path is opposite to the end winding and is used to provide cooling liquid to the end winding, and is opposite to the shaft side of the rotor assembly and is used to provide cooling liquid to the rotor assembly, and the cooling liquid passing through the stator core is provided to the end winding and the rotor assembly. In this way, the casing liquid path and the wall hole provided on the casing are used to guide the cooling liquid from the stator liquid path to the end winding and the rotor assembly, so that all structures of the stator and rotor can be fully cooled along the way, thereby improving the cooling efficiency.

[0047] Another object of the present application is to provide a vehicle, which includes the motor as described above.

[0048] The beneficial effects of the vehicle provided in the present application compared to the prior art are consistent with the beneficial effects of the motor provided in the present application compared to the prior art, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0050] Figure 1 A cross-sectional view of the motor along the axial direction provided in an embodiment of the present application;

[0051] Figure 2 A schematic diagram of a housing provided in an embodiment of the present application;

[0052] Figure 3 A schematic diagram of a stator core from one perspective provided in an embodiment of the present application;

[0053] Figure 4 A schematic diagram of a stator core from another perspective provided in an embodiment of the present application;

[0054] Figure 5 A cross-sectional view of the rotor assembly provided in an embodiment of the present application along the axial direction;

[0055] Figure 6 A cross-sectional view of a balance plate provided in an embodiment of the present application along a radial direction;

[0056] Figure 7 A schematic diagram of one axis side of a balance board provided in an embodiment of the present application;

[0057] Figure 8 This is a schematic diagram of another axial side of the balance board provided in an embodiment of the present application.

[0058] Among them, the reference numerals in the figure are:

[0059] 1000, motor;

[0060] 100, housing; 200, stator assembly; 300, rotor assembly;

[0061] 101, peripheral side wall; 102, axial side wall; 103, oil guide portion;

[0062] 100a, outer shell; 100b, inner shell; 100c, casing liquid path; 100d, wall hole;

[0063] 1011, liquid inlet hole; 1012, first liquid path; 1013, first wall hole; 1014, cooling water path;

[0064] 1012a, axial liquid path; 1012b, first circumferential liquid path;

[0065] 1021, second liquid path; 1022, second wall hole; 1023, third liquid path;

[0066] 1021a, radial liquid path; 1021b, second circumferential liquid path;

[0067] 1031, fourth liquid circuit;

[0068] 201, stator core; 202, end winding;

[0069] 201a, middle iron core; 201b, isolation iron core; 201c, side iron core; 201d, end iron core;

[0070] 2011, first liquid hole; 2012, second liquid hole; 2013, stator liquid path; 2014, oil tank;

[0071] 301, rotor shaft; 302, first balance plate; 303, rotor core; 304, second balance plate; 305, first liquid guide hole; 306, second liquid guide hole; 307, liquid throwing hole;

[0072] 3031, magnetic steel liquid circuit. DETAILED DESCRIPTION

[0073] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0074] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0075] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0076] 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. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0077] The cooling structure of the motor, the motor 1000 and the vehicle provided in the embodiments of the present application are now described.

[0078] It should be noted that the axial, radial and circumferential directions mentioned in the embodiment of the present application may be the axial, radial or circumferential directions of the motor 1000, the housing 100 or the circumferential side wall 101 and the axial side wall 102 in the housing 100, the stator assembly 200 or any component in the stator assembly 200, the rotor assembly 300 or any component in the rotor assembly 300, and the axial, radial and circumferential directions of the above-mentioned components or assemblies are the same axial, radial and circumferential directions. Among them, the coolant includes but is not limited to oil.

[0079] The cooling structure of the motor provided in the embodiment of the present application includes a casing 100, the casing wall of the casing 100 is provided with a liquid inlet hole 1011 penetrating the wall thickness and a wall hole 100d penetrating part of the wall thickness, and the casing wall of the casing 100 is provided with a casing liquid path 100c connected with the wall hole 100d; the liquid inlet hole 1011 is used to communicate with a first liquid hole 2011 provided on the stator core 201 of the motor 1000, and the casing liquid path 100c is used to communicate with a second liquid hole 2012 provided on the stator core 201 of the motor 1000; the wall hole 100d is opposite to the end winding 202 of the stator assembly 200 in the motor 1000, and the wall hole 100d is used to provide cooling liquid to the end winding 202, and / or, the wall hole 100d is opposite to the axial side of the rotor assembly 300 of the motor 1000, and the wall hole 100d is used to provide cooling liquid to the rotor assembly 300.

[0080] In some embodiments, the shell wall includes a peripheral side wall 101 for being arranged on the outer side of the stator assembly 200; the casing liquid circuit 100c includes a first liquid circuit 1012, the wall hole 100d includes a first wall hole 1013, the liquid inlet hole 1011 and the first liquid circuit 1012 are spaced apart axially, the liquid inlet hole 1011, the first liquid circuit 1012 and the first wall hole 1013 are arranged on the peripheral side wall 101, and the first wall hole 1013 is used to be opposite to the outer side surface of the end winding 202 along the radial direction of the motor 1000) and provide cooling liquid to the outer side surface of the end winding 202.

[0081] In some embodiments, the shell wall includes an axial side wall 102 connected to the axial side of the peripheral side wall 101; the casing liquid circuit 100c includes a second liquid circuit 1021 connected to the first liquid circuit 1012, and the wall hole 100d includes a second wall hole 1022 connected to the second liquid circuit 1021. The second liquid circuit 1021 and the second wall hole 1022 are arranged on the axial side wall 102, and the second wall hole 1022 is used to be opposite to the axial side of the end winding 202 along the axial direction of the motor 1000) and provide cooling liquid to the axial side of the end winding 202.

[0082] In some embodiments, the shell wall includes a circumferential side wall 101 for being arranged on the outer side surface of the stator assembly 200, and an axial side wall 102 connected to the axial side of the circumferential side wall 101; the liquid inlet hole 1011 is arranged on the circumferential side wall 101, and the casing liquid circuit 100c includes a third liquid circuit 1023 arranged on the axial side wall 102 and connected to the second liquid hole 2012; the third liquid circuit 1023 is used to communicate with the first liquid circuit hole 305 of the rotor assembly 300 and the magnetic steel liquid circuit 3031.

[0083] In some embodiments, the shell wall includes an oil guide portion 103 provided on the shaft side wall 102 and integrally formed with the shaft side wall 102 , and the housing liquid path 100c includes a fourth liquid path 1031 provided on the oil guide portion 103 , and the fourth liquid path 1031 connects the third liquid path 1023 and the first liquid guide hole 305 .

[0084] In some embodiments, the liquid inlet hole 1011 is arranged at the axial center position of the casing 100, and the liquid inlet hole 1011 is used to be coaxially connected with the first liquid hole 2011 in the radial direction; the stator core 201 is provided with two second liquid holes 2012, and the two second liquid holes 2012 are symmetrically arranged on both sides of the first liquid hole 2011 along the axial direction of the motor 1000); the casing 100 is provided with two groups of casing liquid paths 100c and two groups of wall holes 100d arranged symmetrically on both sides of the stator assembly 200 or the rotor assembly 300 along the axial direction.

[0085] In some embodiments, the casing 100 includes an outer shell 100a and an inner shell 100b that are stacked, and the liquid inlet hole 1011 penetrates the wall thickness of the outer shell 100a and the wall thickness of the inner shell 100b; the casing liquid path 100c is arranged between the outer shell 100a and the inner shell 100b, and the wall hole 100d penetrates the wall thickness of the inner shell 100b.

[0086] In some embodiments, the housing 100 includes a peripheral side wall 101 for being arranged on the outer side surface of the stator assembly 200, and two axial side walls 102 respectively connected to the two axial sides of the peripheral side wall 101, one axial side wall 102 is integrally formed with the peripheral side wall 101, and the other axial side wall 102 is detachably connected to the peripheral side wall 101.

[0087] The cooling structure of the motor provided in the embodiment of the present application is described in detail below in combination with the motor provided in the embodiment of the present application.

[0088] See also Figures 1 to 5 As shown, the motor 1000 provided in the embodiment of the present application includes a housing 100, a rotor assembly 300 and a stator assembly 200. The housing 100 is sleeved on the rotor assembly 300, and the stator assembly 200 is arranged inside the housing 100 and sleeved between the housing 100 and the rotor assembly 300. The stator assembly 200 includes a stator core 201 and an end winding 202 arranged in the axial direction, and the stator core 201 is provided with a first liquid hole 2011 and a second liquid hole 2012 spaced apart in the axial direction, and a stator liquid path 2013 connecting the first liquid hole 2011 and the second liquid hole 2012.

[0089] Among them, the shell wall of the casing 100 is provided with a liquid inlet hole 1011 that penetrates the wall thickness and a wall hole 100d that penetrates part of the wall thickness, and the shell wall of the casing 100 is provided with a casing liquid path 100c that is connected to the wall hole 100d. The first liquid hole 2011 is connected to the liquid inlet hole 1011, and the second liquid hole 2012 is connected to the casing liquid path 100c. The wall hole 100d is opposite to the end winding 202 and is used to provide cooling liquid to the end winding 202, and / or the wall hole 100d is opposite to the axial side of the rotor assembly 300 and is used to provide cooling liquid to the rotor assembly 300.

[0090] Among them, the specific construction of the stator assembly 200 and the specific construction of the rotor assembly 300, as well as the matching relationship between the two in structure and function, and the specific relative position relationship and specific assembly relationship between the stator assembly 200 and the rotor assembly 300 and the housing 100 are well-known technologies in the field of motor 1000, and the embodiments of the present application will not be described in detail. For example, the stator assembly 200 includes a stator core 201 and a stator winding. Generally, silicon steel is made into a sheet by rolling, and the sheet is stamped into a specific shape using a mold, and then stacked to form the stator core 201. Wire slots are formed on the stator core 201, and the stator winding is wound in the wire slots. The stator winding exceeds the axial size of the stator core 201 on both axial sides of the stator core 201, and becomes the end winding 202 provided in the embodiments of the present application.

[0091] For another example, the outer side of the stator core 201 and the inner side of the housing 100 are interference fit, so that the stator assembly 200 is fixed relative to the housing 100, and gaps may be provided between the two axial sides of the end winding 202 and the housing 100, and a gap may be provided between the outer side of the end winding 202 and the housing 100, and a gap may be provided between the inner side of the end winding 202 and the balance plate in the rotor assembly 300. For another example, the rotor assembly 300 includes a rotor shaft 301 and a first balance plate 302, a second balance plate 304 and a rotor core 303 respectively sleeved on the rotor shaft 301, and gaps are respectively provided between the first balance plate 302 and the second balance plate 304 and the housing 100 along the axial direction.

[0092] Among them, the housing 100 is a shell structure, and a cavity is formed inside the housing 100. The housing 100 may include a circumferential side wall 101 surrounding the circumference and two axial side walls 102 respectively connected to the two axial sides of the circumferential side wall 101. In the embodiment of the present application, one axial side wall 102 and the circumferential side wall 101 are integrally formed, and the other axial side wall 102 and the circumferential side wall 101 are detachably connected. When the other axial side wall 102 is connected to the circumferential side wall 101, the two axial ends of the rotor shaft 301 are respectively supported on the two axial side walls 102 through two bearings, and the part of the rotor shaft 301 located between the two axial ends, the first balance plate 302, the second balance plate 304, and the rotor core 303 are all arranged inside the housing 100, that is, between the two axial side walls 102, and the stator assembly 200 is arranged between the rotor assembly 300 and the circumferential side wall 101. When the connection between the other axial side wall 102 and the peripheral side wall 101 is removed, the cavity of the housing 100 is opened, and the motor 1000 can be repaired and parts replaced.

[0093] Generally, the shell wall of the housing 100 may be a single-layer shell wall or a double-layer shell wall. When the shell wall of the housing 100 is a single-layer shell wall, the housing liquid path 100c is formed inside the single-layer shell wall, the liquid inlet hole 1011 and the liquid outlet hole penetrate the entire thickness of the single-layer shell wall, and the wall hole 100d only penetrates a portion of the thickness of the single-layer shell wall and communicates with the inner side surface of the single-layer shell wall.

[0094] When the shell wall of the casing 100 is a double-layer shell wall, the casing 100 includes an outer shell 100a and an inner shell 100b that are stacked, the liquid inlet hole 1011 penetrates the wall thickness of the outer shell 100a and the wall thickness of the inner shell 100b, the casing liquid path 100c is arranged between the outer shell 100a and the inner shell 100b, and the wall hole 100d penetrates the wall thickness of the inner shell 100b and is connected to the inner side surface of the inner shell 100b.

[0095] In some embodiments, the outer shell 100a and the inner shell 100b are spaced apart, one of which is provided with a protruding rib, and the housing fluid path 100c is formed between the two parallel and spaced ribs. Alternatively, in some embodiments, the outer shell 100a and the inner shell 100b are contacted, one of which is provided with a groove, and the groove extends along a set direction to form the housing fluid path 100c.

[0096] In the embodiment of the present application, the housing 100 includes a peripheral side wall 101 disposed on the outer side of the stator assembly 200, and two axial side walls 102 respectively connected to the two axial sides of the peripheral side wall 101, one axial side wall 102 is integrally formed with the peripheral side wall 101, and the integral structure formed by the one axial side wall 102 and the peripheral side wall 101 has an outer shell 100a and an inner shell 100b, that is, the shell wall is a double-layer shell wall. The other axial side wall 102 is detachably connected to the peripheral side wall 101, and the other axial side wall 102 is also called an end cover. The other axial side wall 102 is a single-layer shell wall, and the housing liquid path 100c is formed inside the single-layer shell wall.

[0097] Among them, one-piece molding refers to a process of constructing a predetermined shape by deforming or extending a material body, or leaving a predetermined shape by partially removing a material body, or a structure with a set shape formed by welding or gluing, including but not limited to the extension of the same material or the sequential extension of different materials, including but not limited to the process of using a stamping machine to stamp a blank material to deform it and finally form it into a predetermined shape, or using a forging tool to forge the blank material to deform it and finally form it into a predetermined shape, or using a cutting device to remove part of the blank material to leave a part with a predetermined shape, or using a liquid material to be cast into a casting cavity that is adapted to the shape of the component and then cooled to obtain a component.

[0098] The process of obtaining a component by pouring a liquid material into a casting cavity adapted to the shape of the component may be to obtain a complete component in a cavity, in which one or more materials may be poured. Alternatively, a part of the component may be obtained in a cavity, and the part may be moved to another cavity, and another part of the component may be obtained in another cavity, and so on. Different parts of the complete component may be molded in different cavities in turn, and the materials of different parts of the complete component may be the same or different.

[0099] The shell wall of the housing 100 is provided with a liquid inlet hole 1011 and a liquid outlet hole that penetrate the wall thickness. The coolant enters the interior of the housing 100 through the liquid inlet hole 1011, cools the internal structure of the housing 100, and then flows out of the housing 100 through the liquid outlet hole. Figure 1 As shown, generally, the motor 1000 is Figure 1 The placement direction shown is equipped to a vehicle and provides power to the vehicle. The liquid inlet hole 1011 and the liquid outlet hole are both arranged on the peripheral side wall 101, and the liquid inlet hole 1011 is arranged on the peripheral side wall 101. Figure 1 The top is located at the center of the housing 100 in the axial direction, and the liquid inlet 1011 and the first liquid hole 2011 are coaxially connected in the radial direction. Figure 1 As shown in the bottom, two liquid outlet holes are provided, and the two liquid outlet holes are spaced apart in the axial direction.

[0100] In some embodiments, the stator core 201 is provided with two second liquid holes 2012, and the two second liquid holes 2012 are axially symmetrically arranged on both sides of the first liquid hole 2011. The housing 100 is provided with two groups of housing liquid paths 100c and two groups of wall holes 100d axially symmetrically arranged on both sides of the stator assembly 200 or the rotor assembly 300.

[0101] The motor 1000 provided in the embodiment of the present application has a shell wall of a casing 100 of the motor 1000 provided with a liquid inlet hole 1011 penetrating through the wall thickness and a wall hole 100d penetrating part of the wall thickness, a shell wall of the casing 100 is provided with a casing liquid path 100c connected to the wall hole 100d, external coolant enters the interior of the motor 1000 through the liquid inlet hole 1011 and cools the motor 1000, a first liquid hole 2011 is connected to the liquid inlet hole 1011, and the coolant enters the stator liquid path 2013 to cool the stator core 201, and the second liquid hole 2012 is connected to the casing liquid path 100c, and the coolant passes through the stator core 201 and enters the casing liquid path 100c.

[0102] Among them, the wall hole 100d connected to the housing liquid path 100c and the end winding 202 are opposite and used to provide cooling liquid to the end winding 202, and the cooling liquid is provided to the end winding 202 through the stator core 201. In this way, the housing liquid path 100c and the wall hole 100d provided on the housing 100 are used to guide the cooling liquid from the stator liquid path 2013 to the end winding 202. Compared with the solution of directly spraying the cooling liquid to the end winding 202, the stator core 201 and the end winding 202 of the stator assembly 200 can be fully cooled, thereby improving the cooling efficiency. The housing liquid path 100c and the wall hole 100d provided on the housing 100 are used to replace the existing oil ring mechanism provided outside the end winding 202, thereby reducing the internal components of the motor 1000 and simplifying the internal structure of the motor 1000.

[0103] Alternatively, the wall hole 100d connected to the housing liquid path 100c is opposite to the axial side of the rotor assembly 300 and is used to provide cooling liquid to the rotor assembly 300, and the cooling liquid is provided to the rotor assembly 300 through the stator core 201. In this way, the housing liquid path 100c and the wall hole 100d provided on the housing 100 are used to guide the cooling liquid from the stator liquid path 2013 to the rotor assembly 300. Compared with the solution in which two paths of cooling liquid are provided to the stator core 201 and the rotor assembly 300 respectively, the stator core 201 and the rotor assembly 300 can be fully cooled, thereby improving the cooling efficiency, and the cooling liquid provided by the liquid inlet hole 1011 can be provided to the stator core 201 and the rotor assembly 300 in one path, simplifying the liquid path structure inside the motor 1000, thereby simplifying the overall structure of the motor 1000. Furthermore, compared with delivering the coolant through the gap between the rotor shaft 301 and the drive shaft, the design dimensions of the casing liquid path 100c and the wall hole 100d on the casing 100 are not restricted, and there is no oil stirring loss caused by relative rotation, thereby improving the cooling efficiency.

[0104] Alternatively, the wall hole 100d connected to the housing fluid path 100c is opposite to the end winding 202 and is used to provide cooling liquid to the end winding 202, and is opposite to the axial side of the rotor assembly 300 and is used to provide cooling liquid to the rotor assembly 300, and the cooling liquid passing through the stator core 201 is provided to the end winding 202 and the rotor assembly 300. In this way, the housing fluid path 100c and the wall hole 100d provided on the housing 100 are used to guide the cooling liquid from the stator fluid path 2013 to the end winding 202 and the rotor assembly 300, so that all structures of the stator and rotor can be fully cooled along the way, thereby improving the cooling efficiency.

[0105] In some embodiments, the stator core 201 is provided with two second liquid holes 2012, and the two second liquid holes 2012 are axially arranged on both sides of the first liquid hole 2011. A cooling water path 1014 is provided inside the shell wall, and the cooling water path 1014 is arranged around the circumference of the shell 100. The cooling water path 1014 and the stator liquid path 2013 are radially stacked, and the radially inward projection of the cooling water path 1014 covers the stator liquid path 2013.

[0106] The cooling water path 1014 and the stator liquid path 2013 are radially stacked, and the radially inward projection of the cooling water path 1014 covers the stator liquid path 2013, thereby improving the cooling efficiency transmitted in the radial direction. At the same time, the cooling water path 1014 cools the coolant in the casing 100 and the stator liquid path 2013, and heat exchange can be performed between the cooling water and the coolant, thereby playing the role of a heat exchanger, thereby eliminating the need for an additional heat exchanger and simplifying the internal structure or additional structure of the motor 1000.

[0107] In some specific embodiments, a water inlet and a water outlet are provided on the shell wall of the housing 100, and the cooling water path 1014 is connected to the water inlet and the water outlet. Figure 1 The placement direction shown is equipped to the vehicle and provides power to the vehicle, and the liquid inlet hole 1011 is provided at Figure 1 The top shown is arranged at the axial center position of the peripheral side wall 101, the water inlet hole and the water outlet hole avoid the position of the liquid inlet hole 1011, and the cooling water path 1014 extends axially to both sides with the liquid inlet hole 1011 as the center, the axial dimension occupied by the cooling water path 1014 is approximately consistent with the axial dimension occupied by the stator liquid path 2013, and the axial dimension occupied by the stator liquid path 2013 is approximately consistent with the axial dimension of the stator core 201.

[0108] In some specific embodiments, the peripheral side wall 101 may be a single-layer shell wall or a double-layer shell wall. When the peripheral side wall 101 is a single-layer shell wall, the cooling water channel 1014 is formed inside the single-layer shell wall, and the water inlet and the water outlet penetrate part of the thickness of the single-layer shell wall and communicate with the outer side of the single-layer shell wall. When the peripheral side wall 101 is a double-layer shell wall, the cooling water channel 1014 is arranged between the double-layer shell walls, and the water inlet and the water outlet penetrate the wall thickness of the outer shell wall and communicate with the outer side of the outer shell 100a.

[0109] In some specific embodiments, the stator core 201 can be divided into a middle core 201a, two isolation cores 201b, two side cores 201c, and two end cores 201d in order from the axial direction outward. The middle core 201a is located in the central area of ​​the stator core 201, and the first liquid hole 2011 is provided at the center of the top of the middle core 201a. The coolant enters the stator liquid path 2013 (annularly provided on the outer peripheral surface of the middle core 201a) on the middle core 201a from the first liquid hole 2011, and enters the bottom of the stator core 201 along the stator liquid path 2013. Specifically, an isolation section core 201b is provided between the middle section core 201a and the side core 201c, and an oil groove 2014 is provided at the bottom of the isolation section core 201b. After the coolant reaches the bottom of the middle section core 201a, it flows into the stator liquid path 2013 (annularly arranged on the outer peripheral surface of the side core 201c) of the side cores 201c on both sides through the oil groove 2014 of the isolation section core 201b, and the coolant fills the part where the side core 201c is located, thereby entering the top of the side core 201c. The second liquid hole 2012 is arranged at the top of the end core 201d, and the second liquid hole 2012 is connected with the top of the stator liquid path 2013 of the side core 201c. The coolant entering the top of the side core 201c enters the second liquid hole 2012, flows into the first liquid path 1012 through the second liquid hole 2012, and then enters the casing liquid path 100c through the stator core 201. Among them, the stator liquid path 2013 arranged on the outer peripheral surface of the middle core 201a can be one or more rings, and the number of the rings can be actually selected according to the axial size of the middle core 201a. The stator liquid path 2013 arranged on the outer peripheral surface of the side core 201c can be one or more rings, and the number of the rings can be actually selected according to the axial size of the side core 201c. The stator core 201 is sealed and connected to the housing 100 through two end cores 201 d on both sides, so that the stator fluid path 2013 is sealed between the stator core 201 and the housing 100 .

[0110] In some embodiments, the shell wall of the casing 100 includes a circumferential side wall 101 arranged on the outer side of the stator assembly 200, the casing liquid circuit 100c includes a first liquid circuit 1012, the wall hole 100d includes a first wall hole 1013, the liquid inlet hole 1011 and the first liquid circuit 1012 are axially spaced apart, the liquid inlet hole 1011, the first liquid circuit 1012 and the first wall hole 1013 are arranged on the circumferential side wall 101, and the first wall hole 1013 and the outer side surface of the end winding 202 are radially opposite and are used to provide cooling liquid to the outer side surface of the end winding 202.

[0111] like Figure 1 and Figure 2As shown, in some specific embodiments, the first liquid path 1012 includes an axial liquid path 1012a provided on the circumferential side wall 101 and extending in the axial direction, and a first circumferential liquid path 1012b provided on the circumferential side wall 101 and extending in the circumferential direction. The axial liquid path 1012a and the first circumferential liquid path 1012b are cross-arranged and interconnected, and the axial liquid path 1012a has an inner port and an outer port arranged opposite to each other in the axial direction, and the inner port and the outer port are respectively located on the outer side and the inner side of the first circumferential liquid path 1012b in the axial direction, and the inner port is connected to the second liquid hole 2012. A plurality of first wall holes 1013 are provided on the circumferential side wall 101, and the plurality of first wall holes 1013 are arranged in sequence and spaced in the circumferential direction and are respectively connected to the first circumferential liquid path 1012b. The plurality of first wall holes 1013 are evenly arranged on the periphery of the outer side surface of the end winding 202, so that the cooling liquid passing through the stator liquid path 2013 can be evenly sprayed on the outer side surface of the end winding 202.

[0112] In some embodiments, the housing wall includes an axial side wall 102 connected to the axial side of the peripheral side wall 101, and the stator assembly 200 and the axial side wall 102 are arranged in the axial direction. The housing liquid path 100c includes a second liquid path 1021 connected to the second liquid hole 1021 or the first liquid path 1012, and the wall hole 100d includes a second wall hole 1022 connected to the second liquid path 1021. The second liquid path 1021 and the second wall hole 1022 are arranged on the axial side wall 102, and the second wall hole 1022 is opposite to the axial side of the end winding 202 in the axial direction and is used to provide cooling liquid to the axial side of the end winding 202.

[0113] like Figure 1 and Figure 2 As shown, in some specific embodiments, the second liquid path 1021 includes a radial liquid path 1021a provided on the shaft side wall 102 and extending in the radial direction, and a second circumferential liquid path 1021b provided on the shaft side wall 102 and extending in the circumferential direction. The radial liquid path 1021a and the second circumferential liquid path 1021b are cross-arranged and interconnected, and the radial liquid path 1021a has an upper port and a lower port arranged opposite to each other in the radial direction, and the upper port and the lower port are respectively located on the outer side and the inner side of the second circumferential liquid path 1021b in the radial direction, and the above-mentioned outer port is connected to the upper port. A plurality of second wall holes 1022 are provided on the shaft side wall 102, and the plurality of second wall holes 1022 are arranged in sequence and spaced in the circumferential direction and are respectively connected to the second circumferential liquid path 1021b. The plurality of second wall holes 1022 are evenly arranged on the periphery of the shaft side of the end winding 202, so that the cooling liquid passing through the stator liquid path 2013 can be evenly sprayed on the shaft side of the end winding 202.

[0114] In some embodiments, the shell wall includes a circumferential side wall 101 disposed on the outer side of the stator assembly 200, and an axial side wall 102 connected to the axial side of the circumferential side wall 101. The liquid inlet hole 1011 is disposed on the circumferential side wall 101, and the housing liquid path 100c includes a third liquid path 1023 disposed on the axial side wall 102 and connected to the second liquid path 1021. The rotor assembly 300 includes a rotor shaft 301 and a first balance plate 302 and a rotor core 303 respectively sleeved on the rotor shaft 301. The first balance plate 302 is provided with a first liquid guide hole 305 that penetrates the plate thickness in the axial direction, and the rotor core 303 is provided with a magnetic steel liquid path 3031 that penetrates in the axial direction inside. The third liquid path 1023, the first liquid guide hole 305 and the magnetic steel liquid path 3031 are connected.

[0115] like Figure 1 , Figure 2 and Figures 6 to 8 As shown, in some specific embodiments, the third liquid path 1023 is provided on the shaft side wall 102 and extends in the circumferential direction. The third liquid path 1023 is located on the inner side of the second liquid path 1021 and is connected to the lower port mentioned above. A plurality of first liquid guide holes 305 are provided on the first balance plate 302, which can evenly receive the cooling port from the third liquid path 1023. A plurality of magnetic steel liquid paths 3031 are provided inside the rotor core 303, and the magnetic steel liquid paths 3031 penetrate the rotor core 303 in the axial direction. The plurality of magnetic steel liquid paths 3031 can be arranged at intervals in the circumferential direction, and the plurality of magnetic steel liquid paths 3031 are arranged one-to-one with the plurality of first liquid guide holes 305.

[0116] The magnetic steel liquid path 3031 may be formed by two groups of magnetic steels arranged along the radial gap, or may be formed by two groups of magnetic steels arranged along the circumferential gap. The magnetic steel liquid path 3031 may be penetrated along the axial straight line, or may be penetrated along the axial line in any non-linear manner. The arrangement and function of the magnetic steels in the rotor core 303, and the magnetic steel liquid path 3031 formed between the magnetic steels are well-known technologies in the field of the motor 1000, and are not described in detail in the embodiments of the present application.

[0117] In some embodiments, the rotor assembly 300 includes a second balancing plate 304, and the rotor core 303 is disposed between the first balancing plate 302 and the second balancing plate 304. The magnetic steel liquid path 3031 has an inlet side and an outlet side that are disposed in opposite directions along the axial direction, and the first liquid guide hole 305 is connected to the inlet side. The second balancing plate 304 is provided with a second liquid guide hole 306 that penetrates a portion of the plate thickness along the axial direction, and a liquid ejection hole 307 that connects the second liquid guide hole 306 and the outer side surface of the second balancing plate 304, the second liquid guide hole 306 is connected to the outlet side, and the liquid ejection hole 307 and the inner side surface of the end winding 202 are radially opposite and are used to provide cooling liquid to the inner side surface of the end winding 202.

[0118] The coolant entering the first liquid guide hole 305 cools the magnetic steel in the rotor core 303 through the magnetic steel liquid path 3031, and enters the liquid throwing hole 307 through the second liquid guide hole 306. Under the centrifugal force of the rotor shaft 301, the coolant in the liquid throwing hole 307 is thrown to the inner side of the end winding 202, so that the outer side, shaft side, and inner side of the end winding 202 can be fully cooled through the first wall hole 1013, the second wall hole 1022, and the liquid throwing hole 307, thereby improving the cooling efficiency. At the same time, the coolant from the liquid inlet hole 1011 cools the stator core 201, the end winding 202, and the rotor assembly 300 in all directions, which not only improves the cooling efficiency, reduces fuel consumption, but also simplifies the liquid path structure inside the motor 1000.

[0119] In some embodiments, the first balancing plate 302 and the second balancing plate 304 are configured in the same manner, and are respectively provided with a plurality of first liquid guiding holes 305, a plurality of second liquid guiding holes 306, and a plurality of liquid-spinning holes 307; the stator assembly 200 includes two end windings 202 disposed on two axial sides of the stator core 201. In the first balancing plate 302 or the second balancing plate 304, the plurality of first liquid guiding holes 305 and the plurality of second liquid guiding holes 306 are alternately disposed along the circumferential direction, and the plurality of second liquid guiding holes 306 and the plurality of liquid-spinning holes 307 are connected one-to-one; in the first balancing plate 302 and the second balancing plate 304, the first liquid guiding holes 305 in one and the second liquid guiding holes 306 in the other are opposite to each other along the axial direction, and the liquid-spinning holes 307 in both are opposite to the inner side surfaces of the two end windings 202 along the radial direction.

[0120] A liquid-spinning hole 307 may include a small hole structure or multiple small hole structures. For example, multiple small hole structures are sequentially arranged at intervals along the circumferential direction to form the liquid-spinning hole 307, so that the coolant can be more evenly spun onto the inner side of the end winding 202.

[0121] The cooling liquid that enters the first liquid guide hole 305 of the first balancing plate 302 cools the magnetic steel in the rotor core 303 through the magnetic steel liquid path 3031, and enters the liquid-swinging hole 307 of the second balancing plate 304 through the second liquid guide hole 306 of the second balancing plate 304. The cooling liquid that enters the first liquid guide hole 305 of the second balancing plate 304 cools the magnetic steel in the rotor core 303 through the magnetic steel liquid path 3031, and enters the liquid-swinging hole 307 of the first balancing plate 302 through the second liquid guide hole 306 of the first balancing plate 302.

[0122] First, under the action of the centrifugal force of the rotor shaft 301, the coolant in the liquid-throwing holes 307 on the first balance plate 302 and the liquid-throwing holes 307 on the second balance plate 304 are respectively thrown to the inner side surfaces of the corresponding end windings 202, and combined with the multiple first wall holes 1013 and the multiple second wall holes 1022, the two end windings 202 located on both axial sides of the stator core 201 are fully cooled.

[0123] Secondly, the coolant in the first liquid guide hole 305 of the first balance plate 302 enters the second liquid guide hole 306 of the second balance plate 304 through the magnetic steel liquid path 3031, and the coolant in the first liquid guide hole 305 of the second balance plate 304 enters the second liquid guide hole 306 of the first balance plate 302 through the magnetic steel liquid path 3031 in the opposite direction. The coolant from the same liquid inlet hole 1011 forms cross cooling in opposite directions inside the rotor core 303, forming internal heat exchange, thereby improving the cooling efficiency inside the rotor core 303.

[0124] In some embodiments, the shell wall includes an oil guide portion 103 disposed between the shaft side wall 102 and the first balance plate 302 and integrally formed with the shaft side wall 102 , and the casing liquid path 100c includes a fourth liquid path 1031 disposed on the oil guide portion 103 , and the fourth liquid path 1031 connects the third liquid path 1023 and the first liquid guide hole 305 .

[0125] like Figure 1 As shown, one or more oil guide portions 103 may be formed on the shaft side wall 102. When one oil guide portion 103 is formed on the shaft side wall 102, when the first balance plate 302 and the second balance plate 304 rotate with the rotor assembly 300, one oil guide portion 103 may guide oil to the multiple first liquid guide holes 305 successively. When multiple oil guide portions 103 are formed on the shaft side wall 102, when the first balance plate 302 and the second balance plate 304 rotate with the rotor assembly 300, multiple oil guide portions 103 may guide oil to the multiple first liquid guide holes 305 simultaneously.

[0126] As described above, after the end winding 202 is cooled by the coolant passing through the first wall hole 1013, the second wall hole 1022 and the liquid-spinning hole 307, the coolant falls into the bottom of the motor 1000, and flows out of the motor 1000 through the two liquid outlet holes at the bottom for recycling.

[0127] Another object of the embodiment of the present application is to provide a vehicle, which includes the motor 1000 as described above. The vehicle may include but is not limited to an electric-driven vehicle, an oil-driven vehicle, or an oil-electric hybrid vehicle. The beneficial effects of the vehicle provided by the embodiment of the present application compared to the prior art are consistent with the beneficial effects of the motor 1000 provided by the embodiment of the present application compared to the prior art, and will not be repeated here.

[0128] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A cooling structure for a motor, characterized in that: Comprising a casing (100), the casing wall of the casing (100) being provided with a liquid inlet hole (1011) penetrating the wall thickness and a wall hole (100d) penetrating a portion of the wall thickness, and the casing wall of the casing (100) being provided with a casing liquid path (100c) communicating with the wall hole (100d); The liquid inlet hole (1011) is used to communicate with a first liquid hole (2011) provided on the stator core (201) of the motor (1000), and the casing liquid path (100c) is used to communicate with a second liquid hole (2012) provided on the stator core (201) of the motor (1000); The wall hole (100d) is opposite to the end winding (202) of the stator assembly (200) in the motor (1000), and the wall hole (100d) is used to provide cooling liquid to the end winding (202); and / or the wall hole (100d) is opposite to the axial side of the rotor assembly (300) of the motor (1000), and the wall hole (100d) is used to provide cooling liquid to the rotor assembly (300).

2. The cooling structure of the motor according to claim 1, characterized in that: The shell wall comprises a peripheral side wall (101) for being arranged on the outer side of the stator assembly (200); The casing liquid circuit (100c) comprises a first liquid circuit (1012), the wall hole (100d) comprises a first wall hole (1013), the liquid inlet hole (1011) and the first liquid circuit (1012) are spaced apart along the axial direction of the motor (1000), the liquid inlet hole (1011), the first liquid circuit (1012) and the first wall hole (1013) are arranged on the peripheral side wall (101), and the first wall hole (1013) is used to be opposite to the outer side surface of the end winding (202) along the radial direction of the motor (1000) and to provide cooling liquid to the outer side surface of the end winding (202).

3. The cooling structure of the motor according to claim 2, characterized in that: The shell wall comprises an axial side wall (102) connected to the axial side of the peripheral side wall (101); The casing liquid circuit (100c) comprises a second liquid circuit (1021) in communication with the first liquid circuit (1012); the wall hole (100d) comprises a second wall hole (1022) in communication with the second liquid circuit (1021); the second liquid circuit (1021) and the second wall hole (1022) are arranged on the shaft side wall (102); the second wall hole (1022) is used to be opposite to the shaft side of the end winding (202) along the axial direction of the motor (1000) and to provide cooling liquid to the shaft side of the end winding (202).

4. The cooling structure of the motor according to any one of claims 1 to 3, characterized in that: The shell wall comprises a peripheral side wall (101) for being arranged on the outer side surface of the stator assembly (200), and an axial side wall (102) connected to the axial side of the peripheral side wall (101); the liquid inlet hole (1011) is arranged on the peripheral side wall (101), and the casing liquid path (100c) comprises a third liquid path (1023) arranged on the axial side wall (102) and connected to the second liquid hole (2012); The third liquid circuit (1023) is used to communicate with the first liquid guide hole (305) of the rotor assembly (300) and the magnetic steel liquid circuit (3031).

5. The cooling structure of the motor according to claim 4, characterized in that: The shell wall comprises an oil guide portion (103) provided on the shaft side wall (102) and integrally formed with the shaft side wall (102); the housing liquid path (100c) comprises a fourth liquid path (1031) provided on the oil guide portion (103); the fourth liquid path (1031) is connected to the third liquid path (1023) and the first liquid guide hole (305).

6. The cooling structure of the motor according to any one of claims 1 to 3, characterized in that: The liquid inlet hole (1011) is arranged at the central position of the housing (100) in the axial direction, and the liquid inlet hole (1011) is used to be coaxially connected with the first liquid hole (2011) in the radial direction; the stator core (201) is provided with two second liquid holes (2012), and the two second liquid holes (2012) are symmetrically arranged on both sides of the first liquid hole (2011) along the axial direction of the motor (1000); The casing (100) is provided with two groups of casing fluid paths (100c) and two groups of wall holes (100d) symmetrically arranged along the axial direction on both sides of the stator assembly (200) or the rotor assembly (300).

7. The cooling structure of the motor according to any one of claims 1 to 3, characterized in that: The casing (100) comprises an outer casing (100a) and an inner casing (100b) which are stacked, and the liquid inlet hole (1011) penetrates the wall thickness of the outer casing (100a) and the wall thickness of the inner casing (100b); the casing liquid path (100c) is arranged between the outer casing (100a) and the inner casing (100b), and the wall hole (100d) penetrates the wall thickness of the inner casing (100b).

8. The cooling structure of the motor according to any one of claims 1 to 3, characterized in that: The housing (100) comprises a peripheral side wall (101) for being arranged on the outer side surface of the stator assembly (200), and two axial side walls (102) respectively connected to two axial sides of the peripheral side wall (101); one of the axial side walls (102) is integrally formed with the peripheral side wall (101), and the other of the axial side walls (102) is detachably connected to the peripheral side wall (101).

9. A motor (1000), characterized in that: The motor (1000) comprises a housing (100) as claimed in any one of claims 1 to 8, and a stator assembly (200) and a rotor assembly (300); The housing (100) is sleeved on the rotor assembly (300), and the stator assembly (200) is arranged inside the housing (100) and sleeved between the housing (100) and the rotor assembly (300); The stator assembly (200) comprises a stator core (201) and an end winding (202) arranged in an axial direction, the stator core (201) being provided with a first liquid hole (2011) and a second liquid hole (2012) spaced apart in an axial direction, and a stator liquid path (2013) connecting the first liquid hole (2011) and the second liquid hole (2012); The liquid inlet hole (1011) of the casing (100) is in communication with the first liquid hole (2011), the second liquid hole (2012) is in communication with the casing liquid path (100c) of the casing (100), the wall hole (100d) of the casing (100) is opposite to the end winding (202) and is used to provide cooling liquid to the end winding (202), and / or the wall hole (100d) is opposite to the axial side of the rotor assembly (300) and is used to provide cooling liquid to the rotor assembly (300).

10. The electric machine (1000) according to claim 9, characterized in that: The shell wall of the housing (100) comprises a peripheral side wall (101) arranged on the outer side of the stator assembly (200); The casing liquid path (100c) of the casing (100) comprises a first liquid path (1012), the wall hole (100d) comprises a first wall hole (1013), the liquid inlet hole (1011) and the first liquid path (1012) are spaced apart along the axial direction of the motor (1000), the liquid inlet hole (1011), the first liquid path (1012) and the first wall hole (1013) are arranged on the peripheral side wall (101), and the first wall hole (1013) and the outer side surface of the end winding (202) are opposite to each other along the radial direction of the motor (1000) and are used to provide cooling liquid to the outer side surface of the end winding (202); The shell wall comprises an axial side wall (102) connected to the axial side of the peripheral side wall (101), and the stator assembly (200) and the axial side wall (102) are arranged along the axial direction; The housing liquid path (100c) comprises a second liquid path (1021) in communication with the first liquid path (1012); the wall hole (100d) comprises a second wall hole (1022) in communication with the second liquid path (1021); the second liquid path (1021) and the second wall hole (1022) are arranged on the shaft side wall (102); the second wall hole (1022) and the shaft side of the end winding (202) are opposite to each other along the axial direction of the motor (1000) and are used to provide cooling liquid to the shaft side of the end winding (202); The shell wall comprises a peripheral side wall (101) provided on the outer side of the stator assembly (200), and an axial side wall (102) connected to the axial side of the peripheral side wall (101); the liquid inlet hole (1011) is provided on the peripheral side wall (101), and the casing liquid path (100c) comprises a third liquid path (1023) provided on the axial side wall (102) and connected to the second liquid hole (2012); The rotor assembly (300) comprises a rotor shaft (301), a first balancing plate (302) and a rotor core (303) respectively sleeved on the rotor shaft (301), the first balancing plate (302) being provided with a first liquid guide hole (305) penetrating the plate thickness along the axial direction of the motor (1000), the rotor core (303) being provided with a magnetic steel liquid path (3031) penetrating along the axial direction inside, the third liquid path (1023), the first liquid guide hole (305) and the magnetic steel liquid path (3031) being connected; The rotor assembly (300) comprises a second balancing plate (304), and the rotor core (303) is arranged between the first balancing plate (302) and the second balancing plate (304); the magnetic steel liquid path (3031) has an inlet side and an outlet side arranged in opposite directions along the axial direction, and the first liquid guide hole (305) is connected to the inlet side; The second balancing plate (304) is provided with a second liquid guide hole (306) penetrating a portion of the plate thickness along the axial direction, and a liquid ejection hole (307) connecting the second liquid guide hole (306) and the outer side surface of the second balancing plate (304), the second liquid guide hole (306) being connected to the outlet side, the liquid ejection hole (307) and the inner side surface of the end winding (202) being radially opposite to each other and used for providing cooling liquid to the inner side surface of the end winding (202); The first balancing plate (302) and the second balancing plate (304) are arranged in the same manner, and are respectively provided with a plurality of the first liquid guiding holes (305), a plurality of the second liquid guiding holes (306) and a plurality of the liquid throwing holes (307); the stator assembly (200) comprises two end windings (202) arranged on two axial sides of the stator core (201); In the first balancing plate (302) or the second balancing plate (304), a plurality of the first liquid guiding holes (305) and a plurality of the second liquid guiding holes (306) are alternately arranged along the circumference of the motor (1000), and a plurality of the second liquid guiding holes (306) and a plurality of the liquid-spinning holes (307) are connected one-to-one; in the first balancing plate (302) and the second balancing plate (304), the first liquid guiding holes (305) in one and the second liquid guiding holes (306) in the other are opposite to each other along the axial direction, and the liquid-spinning holes (307) in both are opposite to the inner side surfaces of the two end windings (202) along the radial direction.

11. The electric machine (1000) according to claim 10, characterized in that: The shell wall comprises an oil guide portion (103) which is arranged between the shaft side wall (102) and the first balance plate (302) and is integrally formed with the shaft side wall (102); the housing liquid path (100c) comprises a fourth liquid path (1031) arranged on the oil guide portion (103); the fourth liquid path (1031) is connected to the third liquid path (1023) and the first liquid guide hole (305).

12. The motor (1000) according to claim 9, characterized in that: The stator core (201) is provided with two second liquid holes (2012), and the two second liquid holes (2012) are arranged on both sides of the first liquid hole (2011) along the axial direction; A cooling water path (1014) is provided inside the shell wall of the casing (100), and the cooling water path (1014) is arranged around the circumference of the casing (100). The cooling water path (1014) and the stator liquid path (2013) are stacked in a radial direction, and the inward projection of the cooling water path (1014) in the radial direction covers the stator liquid path (2013).

13. A vehicle, characterized in that: The vehicle comprises an electric machine (1000) as claimed in any one of claims 9 to 12.

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