Cooling structure of motor, motor and vehicle

Abstract

The invention provides a cooling structure of a motor, the motor and a vehicle, and the cooling structure comprises a housing which is provided with a first cavity and a second cavity which is spaced and annularly arranged at the outer side of the first cavity; a first liquid inlet hole is formed in the shell wall of the shell, the first cavity is used for being coaxially assembled with a rotor assembly of the motor, the rotor assembly is provided with a rotor liquid path, and the first liquid inlet hole is used for being communicated with the rotor liquid path and providing first cooling liquid for the rotor liquid path; the second cavity is used for coaxially assembling a stator assembly of the motor, the stator assembly is provided with a stator liquid path, and the second cavity is used for communicating with the stator liquid path and providing second cooling liquid for the stator liquid path; wherein the first cooling liquid and the second cooling liquid are the same or different.

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 power motors of vehicles develop towards high efficiency and high power density, the cooling efficiency of the stators and rotors inside the motors is also improved synchronously, especially for new energy vehicles. Generally, the existing technology uses spray oil cooling to cool the stators and rotors of the motors. For example, the oil entering the rotor assembly is sprayed on the end windings of the stator assembly after flowing out of the rotor assembly, causing the oil to enter the air gap between the stators and rotors, which has an adverse effect on the mutual cooperation between the stators and rotors, and the spray oil cooling cannot fully cool the stator assembly, thereby failing to further improve the cooling efficiency. Summary of the invention

[0003] The purpose of the embodiments of the present application is to provide a cooling structure of a motor, a motor and a vehicle, so as to solve the technical problem that the cooling method adopted by the existing motor easily causes the coolant to enter the air gap between the stator and the rotor and the cooling efficiency is low.

[0004] To achieve the above purpose, the technical solution adopted in this application is:

[0005] A cooling structure of a motor is provided, comprising a housing, wherein the housing has a first cavity and a second cavity spaced apart and arranged around the outside of the first cavity;

[0006] A first liquid inlet hole is provided on the shell wall of the housing, the first cavity is used for coaxially assembling the rotor assembly of the motor, the rotor assembly has a rotor liquid path, and the first liquid inlet hole is used for communicating with the rotor liquid path and providing a first coolant to the rotor liquid path;

[0007] The second cavity is used for coaxially mounting the stator assembly of the motor, the stator assembly has a stator fluid path, and the second cavity is used for communicating with the stator fluid path and providing a second coolant to the stator fluid path; wherein the first coolant and the second coolant are the same or different.

[0008] In some embodiments, a second liquid inlet hole and a second liquid outlet hole are provided on the shell wall of the shell;

[0009] The second liquid inlet hole and the second liquid outlet hole are arranged on both sides of the stator assembly along the axial direction of the motor, the second liquid inlet hole is used to provide the second coolant to the second cavity, and the second liquid outlet hole is used to guide the second coolant out of the second cavity.

[0010] In some embodiments, the casing includes a main shell and a sleeve shell, the main shell includes a circumferential side wall and two axial side walls arranged on both sides of the main shell along the axial direction, the sleeve shell is arranged between the two axial side walls to form the first cavity, and the circumferential side walls are spaced and arranged in an annular manner on the outside of the sleeve shell to form the second cavity.

[0011] In some embodiments, a distance between two shaft side walls along the axial direction is greater than a dimension of the stator assembly along the axial direction.

[0012] In some embodiments, the first liquid inlet hole and the second liquid inlet hole are arranged on the same side of the housing along the axial direction, the first liquid inlet hole is arranged on one of the axial side walls, the second liquid inlet hole is arranged on the peripheral side wall, and the second liquid outlet hole is arranged on the other axial side wall.

[0013] In some embodiments, the sleeve is flared on at least one side along the axial direction, and a first liquid outlet is provided on at least one of the two axial side walls. The first liquid outlet is provided on the inner side of the flared opening along the radial direction of the housing, and the first liquid outlet is connected to the first cavity.

[0014] The cooling structure of the motor provided by the present application has the following beneficial effects:

[0015] Compared with the prior art, the cooling structure of the motor provided by the present application has a casing having a first cavity and a second cavity spaced and arranged around the outside of the first cavity. The first cavity can be coaxially equipped with the rotor assembly of the motor. The rotor fluid path in the rotor assembly can be connected to the first liquid inlet hole on the casing wall. The first liquid inlet hole provides the first coolant to the rotor fluid path, thereby cooling the rotor assembly and preventing the first coolant from entering the first cavity and thus entering the air gap between the stator and the rotor. The second cavity can be coaxially equipped with the stator assembly of the motor. The stator fluid path in the stator assembly is connected to the second cavity. The second cavity provides the second coolant to the stator fluid path. The stator assembly can be immersed in the second coolant in the second cavity, and the inside of the stator assembly can be cooled through the stator fluid path. The stator assembly can be fully cooled, thereby improving the cooling efficiency of the motor.

[0016] Another object of the present application is to provide a motor, the motor comprising the cooling structure of the motor as described above, as well as a rotor assembly and a stator assembly;

[0017] The rotor assembly is coaxially mounted in the first cavity, the rotor assembly has a rotor fluid path, and the first fluid inlet hole is connected to the rotor fluid path; the stator assembly is coaxially mounted in the second cavity, the stator assembly has a stator fluid path, and the second cavity is connected to the stator fluid path.

[0018] In some embodiments, the stator assembly includes a stator core, a stator winding, and a liquid pipe;

[0019] The stator core is provided with wire slots penetrating the stator core along the axial direction of the motor, and the stator winding is wound in the wire slots of the stator core; the liquid pipe is extended along the axial direction, and the liquid pipe is arranged on the inner side or at the slot, and the two axial side pipe openings of the liquid pipe are respectively connected to the second cavity.

[0020] In some embodiments, a second liquid inlet hole and a second liquid outlet hole are provided on the shell wall of the shell;

[0021] The second liquid inlet hole and the second liquid outlet hole are arranged on both sides of the stator assembly along the axial direction. The second coolant enters the second cavity along one side of the axial direction through the second liquid inlet hole, then enters the second cavity along the other side of the axial direction through the liquid passage pipe, and flows out of the second cavity through the second liquid outlet hole.

[0022] In some embodiments, the stator assembly includes two liquid pipes, namely a first liquid pipe and a second liquid pipe;

[0023] The first liquid pipe is arranged inside the wire slot, the second liquid pipe is arranged at the slot opening of the wire slot, and the stator winding is arranged between the first liquid pipe and the second liquid pipe along the radial direction of the motor.

[0024] In some embodiments, the stator core is provided with a plurality of the wire slots, the plurality of the wire slots are arranged at intervals along the circumference of the motor, and each of the wire slots is provided with the first liquid pipe and the second liquid pipe.

[0025] In some embodiments, the rotor assembly includes a rotor shaft and a rotor core sleeved on the rotor shaft, and two balancing plates respectively arranged on both sides of the rotor core along the axial direction of the motor and respectively sleeved on the rotor shaft;

[0026] The rotor liquid circuit includes two first liquid circuits respectively arranged on the two axial sides of the rotor shaft, two second liquid circuits respectively arranged on the two balance plates, and a third liquid circuit arranged on the rotor core. The first coolant enters one of the first liquid circuits, one of the second liquid circuits, the third liquid circuit, another of the second liquid circuits, and another of the first liquid circuits in sequence from the first liquid inlet hole, and flows out of the motor from another of the first liquid circuits.

[0027] In some embodiments, the rotor core is provided with a de-weighting hole, and the de-weighting hole penetrates the rotor core along the axial direction to form the third fluid path.

[0028] In some embodiments, the housing includes a main housing and a sleeve housing, the main housing includes a peripheral side wall and two axial side walls arranged on both sides of the main housing along the axial direction, the sleeve housing is arranged between the two axial side walls to form the first cavity, and the peripheral side walls are spaced and arranged around the outer side of the sleeve housing to form the second cavity;

[0029] Wherein, the two axial side walls are arranged at intervals on both sides of the stator core along the axial direction.

[0030] In some embodiments, the stator assembly includes insulating paper attached to the slot wall of the wire slot, the insulating paper blocks the slot opening, and the liquid passage provided at the slot opening is pressed between the insulating paper and the casing.

[0031] The beneficial effects of the motor provided by the present application are:

[0032] Compared with the prior art, the motor provided by the present application has a casing having a first cavity and a second cavity spaced apart and arranged around the outside of the first cavity, the first cavity is coaxially equipped with the rotor assembly of the motor, the rotor fluid path in the rotor assembly is connected to the first liquid inlet hole on the casing wall, the first liquid inlet hole provides the first coolant to the rotor fluid path, thereby cooling the rotor assembly, and preventing the first coolant from entering the first cavity and thus entering the air gap between the stator and the rotor. The second cavity is coaxially equipped with the stator assembly of the motor, the stator fluid path in the stator assembly is connected to the second cavity, the second cavity provides the second coolant to the stator fluid path, the stator assembly is immersed in the second coolant in the second cavity, and the inside of the stator assembly is cooled through the stator fluid path, the stator assembly can be fully cooled, thereby improving the cooling efficiency of the motor.

[0033] Another object of the present application is to provide a vehicle, which includes the motor as described above.

[0034] 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

[0035] 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.

[0036] Figure 1 An axial cross-sectional view of the motor provided in an embodiment of the present application;

[0037] Figure 2A radial cross-sectional view of a motor provided in an embodiment of the present application;

[0038] Figure 3 A schematic diagram of a stator assembly provided in an embodiment of the present application being sleeved on a casing;

[0039] Figure 4 An axial cross-sectional view of a rotor assembly provided in an embodiment of the present application;

[0040] Figure 5 An axial cross-sectional view of a rotor shaft provided in an embodiment of the present application;

[0041] Figure 6 A schematic diagram of a rotor shaft provided in an embodiment of the present application;

[0042] Figure 7 A schematic diagram of a balance board provided in an embodiment of the present application;

[0043] Figure 8 A schematic diagram of a rotor core provided in an embodiment of the present application;

[0044] Fig. 9 A schematic diagram of a shaft side wall provided with a second liquid outlet provided in an embodiment of the present application.

[0045] Among them, the reference numerals in the figure are:

[0046] 100, housing; 200, rotor assembly; 300, stator assembly;

[0047] 100a, first cavity; 100b, second cavity; 200a, rotor fluid path; 300a, stator fluid path;

[0048] 101, casing; 102, peripheral side wall; 103, axial side wall; 1021, second liquid inlet hole; 1031, first liquid inlet hole; 1032, second liquid outlet hole; 1033, first liquid outlet hole; 1032a, large diameter hole group; 10322b, small diameter hole group;

[0049] 201, rotor shaft; 202, balance plate; 203, rotor core; 2011, first fluid path; 2011a, axial fluid path; 2011b, first radial fluid path; 2021, second fluid path; 2021a, second radial fluid path; 2021b, circumferential fluid path; 2031, third fluid path; 203a, deweighting hole;

[0050] 301, stator core; 302, stator winding; 303, liquid pipe; 304, insulating paper; 3011, wire slot; 3031, first liquid pipe; 3032, second liquid pipe. DETAILED DESCRIPTION

[0051] 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.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] The cooling structure of the motor, the motor and the vehicle provided in the embodiments of the present application are now described.

[0056] See also Figures 1 to 8 As shown, the cooling structure of the motor provided in the embodiment of the present application includes a housing 100, and the housing 100 has a first cavity 100a and a second cavity 100b spaced and arranged outside the first cavity 100a. A first liquid inlet hole 1031 is provided on the housing wall of the housing 100, and the first cavity 100a is used to coaxially assemble the rotor assembly 200 of the motor, and the rotor assembly 200 has a rotor liquid path 200a. The first liquid inlet hole 1031 is used to communicate with the rotor liquid path 200a and provide the first cooling liquid to the rotor liquid path 200a.

[0057] The second cavity 100b is used to coaxially assemble the stator assembly 300 of the motor, and the stator assembly 300 has a stator liquid path 300a. The second cavity 100b is used to communicate with the stator liquid path 300a and provide the second coolant to the stator liquid path 300a. The first coolant and the second coolant are the same or different. Generally, the first coolant and the second coolant are the same, and both can be oil. The first coolant and the second coolant can also be water or other coolants respectively.

[0058] The motor has a central axis. The axial direction of the motor refers to the extension direction of the central axis, the radial direction of the motor refers to the direction perpendicular to the central axis, and the circumferential direction of the motor refers to the direction surrounding the central axis. The stator assembly 300 and the rotor assembly 200 can both be coaxially installed in the cooling structure of the motor to form a motor.

[0059] The first cavity 100a may be a cylindrical space centered on the central axis. The first cavity 100a is provided with an opening on at least one side along the axial direction. The opening is used to pass through at least one axial side of the rotor shaft 201 in the rotor assembly 200 for outputting the power of the motor. The two axial sides of the rotor shaft 201 may be supported on the housing 100 through bearings. The rotor assembly 200 is mounted in the first cavity 100a. Except for the liquid hole opened on the housing wall of the housing 100 forming the first cavity 100a, the housing 100 and the rotor assembly 200 make the first cavity 100a substantially a closed cavity.

[0060] The second cavity 100b is spaced and arranged in an annular manner outside the first cavity 100a, that is, the first cavity 100a and the second cavity 100b can be spaced in an outward radial direction of the motor, and the second cavity 100b can be an annular space centered on the central axis, and the stator assembly 300 can be arranged in the second cavity 100b, that is, the rotor assembly 200 and the stator assembly 300 can be spaced in an outward radial direction of the motor.

[0061] The specific construction of the stator assembly 300 and the specific construction of the rotor assembly 200, 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 300 and the rotor assembly 200 and the housing 100 are well-known technologies in the field of motors, and the embodiments of the present application will not be described in detail. For example, the stator assembly 300 includes a stator core 301 and a stator winding 302. 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 a stator core 301201. A wire slot 3011 is formed on the stator core 301, and the stator winding 302 is wound in the wire slot 3011. For another example, the outer side surface of the stator core 301 and the inner side surface of the housing 100 are interference fit so that the stator assembly 300 is fixed relative to the housing 100.

[0062] The cooling structure of the motor provided in the embodiment of the present application comprises a casing 100 having a first cavity 100a and a second cavity 100b spaced apart and arranged on the outside of the first cavity 100a. The first cavity 100a can be coaxially equipped with the rotor assembly 200 of the motor. The rotor fluid path 200a in the rotor assembly 200 can be connected to the first liquid inlet hole 1031 on the casing wall of the casing 100. The first liquid inlet hole 1031 provides the first coolant to the rotor fluid path 200a, thereby cooling the rotor assembly 200 and preventing the first coolant from entering the first cavity 100a and thus entering the air gap between the stator and the rotor. The second cavity 100b can be coaxially equipped with the stator assembly 300 of the motor. The stator fluid path 300a in the stator assembly 300 is connected to the second cavity 100b. The second cavity 100b provides the second coolant to the stator fluid path 300a. The stator assembly 300 can be immersed in the second coolant in the second cavity 100b, and the inside of the stator assembly 300 can be cooled through the stator fluid path 300a. The stator assembly 300 can be fully cooled, thereby improving the cooling efficiency of the motor.

[0063] In some embodiments, a second liquid inlet hole 1021 and a second liquid outlet hole 1032 are provided on the shell wall of the housing 100. The second liquid inlet hole 1021 and the second liquid outlet hole 1032 are used to be provided on both sides of the stator assembly 300 along the axial direction of the motor, the second liquid inlet hole 1021 is used to provide the second coolant to the second cavity 100b, and the second liquid outlet hole 1032 is used to guide the second coolant out of the second cavity 100b.

[0064] The second liquid inlet hole 1021 and the second liquid outlet hole 1032 can be axially arranged on both sides of the stator assembly 300. The second coolant enters one side of the second cavity 100b along the axial direction through the second liquid inlet hole 1021, then enters the other side of the second cavity 100b along the axial direction through the liquid pipe 303, and flows out of the second cavity 100b through the second liquid outlet hole 1032.

[0065] The stator assembly 300 can be immersed in the second coolant in the second cavity 100b. For example, at least the two sides of the stator assembly 300 along the axial direction can be immersed in the two sides of the second cavity 100b along the axial direction respectively. The second coolant in one side of the second cavity 100b along the axial direction enters the stator liquid path 300a. The stator liquid path 300a in the stator assembly 300 is connected with the other side of the second cavity 100b along the axial direction. The second coolant can cool the inside of the stator assembly 300 through the stator liquid path 300a and flow out from the other side, thereby fully cooling the stator assembly 300.

[0066] In some embodiments, the housing 100 includes a main shell and a sleeve shell 101, the main shell includes a circumferential side wall 102 and two axial side walls 103 axially arranged on both sides of the main shell, the sleeve shell 101 is arranged between the two axial side walls 103 to form a first cavity 100a, and the circumferential side walls 102 are spaced and arranged in a ring on the outside of the sleeve shell 101 to form a second cavity 100b.

[0067] The casing 101 may be cylindrical with the central axis as the center. The casing 101 and the two axial side walls 103 are combined to form a first cavity 100a having a cylindrical space. The entire rotor assembly 200 is arranged on the radial inner side of the casing 101. At least one of the two axial side walls 103 is provided with an opening, which is used to pass at least one axial side of the rotor shaft 201 in the rotor assembly 200. The two axial sides of the rotor shaft 201 can be supported on the two axial side walls 103 by bearings.

[0068] The peripheral side wall 102 may be cylindrical or square with the central axis as the center. The peripheral side wall 102, the casing 101 and the two axial side walls 103 are combined to form a second cavity 100b with an annular space. The entire stator assembly 300 is arranged on the radially outer side of the casing 101 and the radially inner side of the peripheral side wall 102. In some embodiments, the outer peripheral side of the stator assembly 300 is interference fit with the inner peripheral side of the peripheral side wall 102, and the inner peripheral side of the stator assembly 300 and the outer peripheral side of the casing 101 are abutted and fit.

[0069] In some embodiments, the axial spacing between the two axial side walls 103 is greater than the axial size of the stator assembly 300. The two axial side walls 103 and the two sides of the stator assembly 300 along the axial direction can be spaced apart by a larger spacing so as to accommodate a larger volume of the second coolant, thereby sufficiently immersing the stator assembly 300 and improving the cooling efficiency of the stator assembly 300.

[0070] In some embodiments, the first liquid inlet hole 1031 and the second liquid inlet hole 1021 are arranged on the same side of the housing 100 in the axial direction, and the liquid supply device outside the motor can conveniently provide cooling liquid to the stator assembly 300 and the rotor assembly 200 at the same time. The first liquid inlet hole 1031 is arranged on one axial side wall 103, so that the first liquid inlet hole 1031 can radially provide the first coolant to the rotor shaft 201 located on the central axis. The second liquid inlet hole 1021 is arranged on the circumferential side wall 102, and the first liquid inlet hole 1031 and the second liquid inlet hole 1021 are staggered and do not interfere with each other. The second liquid outlet hole 1032 is arranged on the other axial side wall 103, and the second liquid outlet hole 1032 can be arranged at a position radially away from the casing 101.

[0071] In some embodiments, at least one side of the casing 101 along the axial direction is flared, and at least one of the two axial side walls 103 is provided with a first liquid outlet 1033, which is arranged on the inner side of the flared opening along the radial direction of the casing 100, and the first liquid outlet 1033 is connected to the first cavity 100a. The oil seal between the axial side of the rotor shaft 201 and the axial side wall 103 may leak oil, and the axial side of the casing 101 along the axial direction is flared, and the leaked oil flows along the inner side wall of the axial side wall 103 into the inner side of the flared opening, that is, the inner side of the part where the flared opening and the main part of the casing 101 have a size difference along the radial direction, and the leaked oil is collected in the chamfer between the flared opening and the axial side wall 103, and flows into the first cavity 100a through the second liquid outlet 1032, effectively preventing the leaked oil from entering the air gap.

[0072] Another object of the embodiment of the present application is to provide a motor, which includes the cooling structure of the motor as described above, as well as a rotor assembly 200 and a stator assembly 300. The rotor assembly 200 is coaxially mounted in the first cavity 100a, the rotor assembly 200 has a rotor fluid path 200a, and the first liquid inlet hole 1031 is connected to the rotor fluid path 200a; the stator assembly 300 is coaxially mounted in the second cavity 100b, the stator assembly 300 has a stator fluid path 300a, and the second cavity 100b is connected to the stator fluid path 300a.

[0073] The motor provided in the embodiment of the present application comprises a casing 100 having a first cavity 100a and a second cavity 100b spaced apart and arranged on the outside of the first cavity 100a, the first cavity 100a is coaxially equipped with the rotor assembly 200 of the motor, the rotor fluid path 200a in the rotor assembly 200 is connected to the first liquid inlet hole 1031 on the shell wall of the casing 100, the first liquid inlet hole 1031 provides the first coolant to the rotor fluid path 200a, thereby cooling the rotor assembly 200 and preventing the first coolant from entering the first cavity 100a and thus entering the air gap between the stator and the rotor. The second cavity 100b is coaxially equipped with the stator assembly 300 of the motor, and the stator fluid path 300a in the stator assembly 300 is connected with the second cavity 100b. The second cavity 100b provides the second coolant to the stator fluid path 300a. The stator assembly 300 is immersed in the second coolant in the second cavity 100b, and the inside of the stator assembly 300 is cooled through the stator fluid path 300a. The stator assembly 300 can be fully cooled, thereby improving the cooling efficiency of the motor.

[0074] In some embodiments, the stator assembly 300 includes a stator core 301, a stator winding 302, and a liquid passage 303. The stator core 301 is provided with a wire slot 3011 that penetrates the stator core 301 along the axial direction of the motor, and the stator winding 302 is wound in the wire slot 3011 of the stator core 301. The wire slot 3011 penetrates the stator core 301 along the axial direction, and the wire slot 3011 is connected to the inner circumferential wall of the stator core 301 to form a notch. The wall of the wire slot 3011 is provided with an insulating paper 304, and the insulating paper 304 also closes the notch of the wire slot 3011. The stator winding 302 is wound on the inner side of the insulating paper 304.

[0075] The liquid-through pipe 303 is arranged to extend in the axial direction, and is arranged on the inner side or notch of the wire slot 3011. The two axial side pipe openings of the liquid-through pipe 303 are respectively connected to the second cavity 100b. In some embodiments, the liquid-through pipe 303 can be arranged on the inner side of the insulating paper 304 on the inner side of the wire slot 3011, or between the slot wall of the wire slot 3011 and the insulating paper 304. In some embodiments, the liquid-through pipe 303 arranged at the notch is pressed between the insulating paper 304 and the casing 101.

[0076] The liquid pipe 303 is a long tube structure, and the cross-section of the liquid pipe 303 can be flat, so that it is convenient to fit closely to the slot wall or the insulating paper 304 of the wire slot 3011, and also convenient to press between the insulating paper 304 and the casing 101, thereby playing the role of a slot wedge, and making it easier for the liquid pipe 303 to have a larger contact area with the stator winding 302 and the stator core 301, so as to improve the heat dissipation efficiency.

[0077] In some embodiments, a second liquid inlet hole 1021 and a second liquid outlet hole 1032 are provided on the shell wall of the housing 100. The second liquid inlet hole 1021 and the second liquid outlet hole 1032 are axially arranged on both sides of the stator assembly 300. The second coolant enters one side of the second cavity 100b along the axial direction through the second liquid inlet hole 1021, then enters the other side of the second cavity 100b along the axial direction through the liquid pipe 303, and flows out of the second cavity 100b through the second liquid outlet hole 1032.

[0078] The stator assembly 300 is immersed in the second coolant in the second cavity 100b, and at least the two sides of the stator assembly 300 along the axial direction are respectively immersed in the two sides of the second cavity 100b along the axial direction. The second coolant in one side of the second cavity 100b along the axial direction enters an axial side pipe opening of the liquid pipe 303, and the other axial side pipe opening of the liquid pipe 303 is connected to the other axial side of the second cavity 100b. The second coolant can cool the inside of the stator assembly 300 through the liquid pipe 303 and flow out from the other side, thereby fully cooling the stator assembly 300.

[0079] In some embodiments, the stator assembly 300 includes two liquid pipes 303, namely a first liquid pipe 3031 and a second liquid pipe 3032. The first liquid pipe 3031 is arranged on the inner side of the wire slot 3011, and the second liquid pipe 3032 is arranged at the notch of the wire slot 3011. The stator winding 302 is arranged between the first liquid pipe 3031 and the second liquid pipe 3032 along the radial direction of the motor, and the stator winding 302 can be cooled from both sides of the radial direction of the stator winding 302 to improve the heat dissipation efficiency.

[0080] In some embodiments, the liquid tubes 303 can be arranged around the stator winding 302 in any possible manner. For example, if the volume of the slot 3011 allows, multiple liquid tubes 303 can be arranged circumferentially on the inner side of the slot wall of the slot 3011, or the stator winding 302 and the liquid tubes 303 can be alternately arranged in the slot 3011, for example, alternately arranged radially.

[0081] In some embodiments, the stator core 301 is provided with a plurality of wire slots 3011, and the plurality of wire slots 3011 are arranged at intervals along the circumference of the motor. Each wire slot 3011 is provided with a first liquid tube 3031 and a second liquid tube 3032. The plurality of first liquid tubes 3031 and the plurality of second liquid tubes 3032 fully cool different parts of the stator winding 302 and the inner part of the stator core 301, so as to improve the heat dissipation efficiency.

[0082] In some embodiments, the rotor assembly 200 includes a rotor shaft 201 and a rotor core 203 sleeved on the rotor shaft 201, and two balancing plates 202 respectively arranged on both sides of the rotor core 203 along the axial direction of the motor and respectively sleeved on the rotor shaft 201. The rotor fluid path 200a includes two first fluid paths 2011 respectively arranged on two axial sides of the rotor shaft 201, two second fluid paths 2021 respectively arranged on the two balancing plates 202, and a third fluid path 2031 arranged on the rotor core 203. The first coolant sequentially enters one first fluid path 2011, one second fluid path 2021, the third fluid path 2031, another second fluid path 2021, and another first fluid path 2011 from the first fluid inlet hole 1031, and flows out of the motor from the other first fluid path 2011.

[0083] A first liquid path 2011 in the rotor assembly 200 is communicated with the first liquid inlet hole 1031 on the shaft side wall 103. The flared shape and the first liquid path 2011 are located on the same side of the rotor shaft 201, and can collect oil leakage from the oil seal between the first liquid path 2011 and the shaft side wall 103. The first liquid inlet hole 1031 provides the first coolant to the first liquid path 2011, thereby introducing the first coolant into the rotor liquid path 200a and cooling the rotor assembly 200, and preventing the first coolant from entering the first cavity 100a and thus entering the air gap between the stator and the rotor.

[0084] In some embodiments, the rotor core 203 is provided with a weight-removing hole 203a, and the weight-removing hole 203a penetrates the rotor core 203 in the axial direction to form a third fluid path 2031. In some embodiments, the stator core 301 is provided with weight-removing holes 203a arranged at intervals along the circumference of the motor, and the stator core 301 is further provided with a magnetic steel structure on the outer periphery of the plurality of weight-removing holes 203a. In some embodiments, the third fluid path 2031 can also be formed by gaps between two adjacent groups of magnetic steel structures.

[0085] In some embodiments, the first liquid path 2011 may include an axial liquid path 2011a extending axially and a plurality of first radial liquid paths 2011b extending radially, the axial liquid path 2011a is connected to the first liquid inlet hole 1031 , and the plurality of first radial liquid paths 2011b are connected to the second liquid path 2021 .

[0086] In some embodiments, the second liquid path 2021 may include a second radial liquid path 2021a extending in the radial direction and a circumferential liquid path 2021b extending in the circumferential direction, the second radial liquid path 2021a and the circumferential liquid path 2021b are respectively multiple and connected one-to-one, the multiple first radial liquid paths 2011b and the multiple second radial liquid paths 2021a are connected one-to-one in the radial direction, and the multiple circumferential liquid paths 2021b are connected to the multiple deweighting holes 203a. The second radial liquid path 2021a and the circumferential liquid path 2021b are arranged on the inner side of the balance plate 202.

[0087] In some embodiments, the housing 100 includes a main housing and a casing 101, the main housing includes a circumferential side wall 102 and two axial side walls 103 arranged on both sides of the main housing in the axial direction, the casing 101 is arranged between the two axial side walls 103 to form a first cavity 100a, and the circumferential side walls 102 are spaced and arranged on the outer side of the casing 101 to form a second cavity 100b. The two axial side walls 103 are spaced and arranged on both sides of the stator core 301 in the axial direction. The two axial side walls 103 and the two sides of the stator assembly 300 in the axial direction can be spaced at a larger distance so as to hold more second coolant, form sufficient immersion of the stator assembly 300, and improve the cooling efficiency of the stator assembly 300.

[0088] like Fig. 9 As shown, the shaft side wall 103 is provided with a second liquid outlet hole 1032. In some embodiments, the second liquid outlet hole 1032 may include a large-diameter hole group 1032a and a small-diameter hole group 1032b.

[0089] The large diameter hole group 1032a includes at least one hole with a relatively large hole diameter, for example Fig. 9 As shown, it may include three holes with larger apertures spaced apart along the circumference. The second liquid outlet hole 1032 may include one or more large-diameter hole groups 1032a, for example Fig. 9As shown, one large diameter hole group 1032a may be included.

[0090] The small diameter hole group 1032b includes at least one hole with a smaller hole diameter, for example Fig. 9 As shown, it may include three holes with smaller apertures spaced apart along the circumference. The second liquid outlet hole 1032 may include one or more small-diameter hole groups 1032b, for example Fig. 9 As shown, three large-diameter hole groups 1032a may be included, and the three large-diameter hole groups 1032a are arranged at intervals along the circumferential direction.

[0091] like Fig. 9 As shown, the large diameter hole group 1032a is arranged at the upper position of the shaft side wall 103, that is, as shown in FIG. Figure 1 A small diameter hole group 1032b is provided at the lower part of the shaft side wall 103, that is, Figure 1 The other two small diameter hole groups 1032b are arranged in the middle of the shaft side wall 103 and are spaced apart in the horizontal direction ( Figure 1 not shown).

[0092] The aperture of the large diameter hole group 1032a is larger than that of the small diameter hole group 1032b, so that the oil output of the large diameter hole group 1032a is greater than that of the small diameter hole group 1032b, so that the oil can smoothly fill the second cavity 100b and immerse the stator assembly 300.

[0093] Another object of the embodiment of the present application is to provide a vehicle, the vehicle comprising the above motor. The beneficial effects of the vehicle provided by the embodiment of the present application compared with the prior art are consistent with the beneficial effects of the motor provided by the present application compared with the prior art, which will not be repeated here.

[0094] 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: The invention comprises a housing (100), wherein the housing (100) has a first cavity (100a) and a second cavity (100b) spaced apart from and arranged around the outside of the first cavity (100a); A first liquid inlet hole (1031) is provided on the shell wall of the housing (100); the first cavity (100a) is used to coaxially mount the rotor assembly (200) of the motor; the rotor assembly (200) has a rotor liquid path (200a); the first liquid inlet hole (1031) is used to communicate with the rotor liquid path (200a) and provide a first coolant to the rotor liquid path (200a); The second cavity (100b) is used for coaxially assembling the stator assembly (300) of the motor, the stator assembly (300) having a stator fluid path (300a), and the second cavity (100b) is used for communicating with the stator fluid path (300a) and providing a second coolant to the stator fluid path (300a); wherein the first coolant and the second coolant are the same or different.

2. The cooling structure of the motor according to claim 1, characterized in that: A second liquid inlet (1021) and a second liquid outlet (1032) are provided on the shell wall of the shell (100); The second liquid inlet hole (1021) and the second liquid outlet hole (1032) are arranged on both sides of the stator assembly (300) along the axial direction of the motor; the second liquid inlet hole (1021) is used to provide the second coolant to the second cavity (100b); and the second liquid outlet hole (1032) is used to discharge the second coolant out of the second cavity (100b).

3. The cooling structure of the motor according to claim 2, characterized in that: The casing (100) comprises a main casing and a casing (101); the main casing comprises a circumferential side wall (102) and two axial side walls (103) arranged on both sides of the main casing along the axial direction; the casing (101) is arranged between the two axial side walls (103) to form the first cavity (100a); the circumferential side walls (102) are spaced and arranged in a ring on the outer side of the casing (101) to form the second cavity (100b).

4. The cooling structure of the motor according to claim 3, characterized in that: The distance between the two shaft side walls (103) along the axial direction is greater than the dimension of the stator assembly (300) along the axial direction.

5. The cooling structure of the motor according to claim 3, characterized in that: The first liquid inlet hole (1031) and the second liquid inlet hole (1021) are arranged on the same side of the housing (100) along the axial direction, the first liquid inlet hole (1031) is arranged on one of the axial side walls (103), the second liquid inlet hole (1021) is arranged on the circumferential side wall (102), and the second liquid outlet hole (1032) is arranged on the other of the axial side walls (103).

6. The cooling structure of the motor according to claim 3, characterized in that: The sleeve (101) is in a flared shape along at least one side of the axial direction, and a first liquid outlet hole (1033) is provided on at least one of the two axial side walls (103). The first liquid outlet hole (1033) is provided on the inner side of the flared shape along the radial direction of the housing (100), and the first liquid outlet hole (1033) is connected to the first cavity (100a).

7. A motor, characterized in that: The motor comprises a cooling structure of the motor as claimed in any one of claims 1 to 6, as well as a rotor assembly (200) and a stator assembly (300); The rotor assembly (200) is coaxially mounted in the first cavity (100a), the rotor assembly (200) has a rotor fluid path (200a), and the first fluid inlet hole (1031) is in communication with the rotor fluid path (200a); the stator assembly (300) is coaxially mounted in the second cavity (100b), the stator assembly (300) has a stator fluid path (300a), and the second cavity (100b) is in communication with the stator fluid path (300a).

8. The motor according to claim 7, characterized in that: The stator assembly (300) comprises a stator core (301), a stator winding (302) and a liquid passage pipe (303); The stator core (301) is provided with a wire slot (3011) penetrating the stator core (301) along the axial direction of the motor, and the stator winding (302) is wound in the wire slot (3011) of the stator core (301); the liquid passage pipe (303) is extended along the axial direction, and the liquid passage pipe (303) is arranged on the inner side or at the notch of the wire slot (3011); two axial side pipe openings of the liquid passage pipe (303) are respectively connected to the second cavity (100b), and the liquid passage pipe (303) forms the stator liquid path (300a).

9. The motor according to claim 8, characterized in that: A second liquid inlet (1021) and a second liquid outlet (1032) are provided on the shell wall of the shell (100); The second liquid inlet hole (1021) and the second liquid outlet hole (1032) are arranged on both sides of the stator assembly (300) along the axial direction; the second coolant enters the second cavity (100b) along one side of the axial direction through the second liquid inlet hole (1021), then enters the second cavity (100b) along the other side of the axial direction through the liquid passage (303), and flows out of the second cavity (100b) through the second liquid outlet hole (1032).

10. The motor according to claim 8 or 9, characterized in that: The stator assembly (300) comprises two liquid passage pipes (303), namely a first liquid passage pipe (3031) and a second liquid passage pipe (3032); The first liquid pipe (3031) is arranged on the inner side of the wire slot (3011), the second liquid pipe (3032) is arranged at the notch of the wire slot (3011), and the stator winding (302) is arranged between the first liquid pipe (3031) and the second liquid pipe (3032) along the radial direction of the motor; The stator core (301) is provided with a plurality of wire slots (3011), the plurality of wire slots (3011) are arranged at intervals along the circumference of the motor, and each of the wire slots (3011) is provided with the first liquid passage pipe (3031) and the second liquid passage pipe (3032).

11. The motor according to claim 7, characterized in that: The rotor assembly (200) comprises a rotor shaft (201), a rotor core (203) sleeved on the rotor shaft (201), and two balancing plates (202) respectively arranged on both sides of the rotor core (203) along the axial direction of the motor and respectively sleeved on the rotor shaft (201); The rotor liquid circuit (200a) comprises two first liquid circuits (2011) respectively arranged on two axial sides of the rotor shaft (201), two second liquid circuits (2021) respectively arranged on two balancing plates (202), and a third liquid circuit (2031) arranged on the rotor core (203); the first coolant sequentially enters one of the first liquid circuits (2011), one of the second liquid circuits (2021), the third liquid circuit (2031), another of the second liquid circuits (2021), and another of the first liquid circuits (2011) through the first liquid inlet hole (1031), and flows out of the motor through another of the first liquid circuits (2011); The rotor core (203) is provided with a de-weighting hole (203a), and the de-weighting hole (203a) penetrates the rotor core (203) along the axial direction to form the third fluid path (2031).

12. The motor according to claim 8, characterized in that: The housing (100) comprises a main housing and a casing (101); the main housing comprises a circumferential side wall (102) and two axial side walls (103) arranged on both sides of the main housing along the axial direction; the casing (101) is arranged between the two axial side walls (103) to form the first cavity (100a); the circumferential side walls (102) are spaced and arranged around the outer side of the casing (101) to form the second cavity (100b); Wherein, the two axial side walls (103) are arranged at intervals on both sides of the stator core (301) along the axial direction; The stator assembly (300) comprises an insulating paper (304) attached to the slot wall of the wire slot (3011), the insulating paper (304) blocks the slot opening, and the liquid passage (303) provided at the slot opening is pressed between the insulating paper (304) and the casing (101).

13. A vehicle, characterized in that: The vehicle comprises an electric machine as claimed in any one of claims 7-12.

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