Motor, electric driving device, electric driving system and electric equipment

Abstract

The utility model provides a motor, an electric driving device, an electric driving system and electric equipment, the motor comprises a first shell, a stator and a rotor, the first shell is provided with a stator cavity and a rotor cavity which are separated from each other, the stator is accommodated in the stator cavity, the rotor is accommodated in the rotor cavity, and a first air gap is formed between the rotor and the stator; the first air gap is positioned in the rotor cavity and is used for circulating an atomized cooling medium; according to the motor, the atomized cooling medium flows in the first air gap, the atomized cooling medium can directly absorb heat generated by the rotor in the working process, the cooling effect of the rotor is effectively improved, meanwhile, compared with a traditional liquid cooling medium, the resistance of the atomized cooling medium acting on the rotor is small, and the service life of the motor is prolonged. And the oil stirring loss of the rotor is effectively reduced, so that the working performance of the motor is effectively improved.

Description

Technical Field

[0001] The present application relates to the technical field of motors, and particularly to a motor, an electric drive device, an electric drive system, and an electric device. Background Art

[0002] With the increasing aggravation of environmental pollution, new energy products are more and more favored by people. As the power device of new energy products, the electric drive device is used to convert the electric energy provided by the battery into mechanical energy to drive the new energy products to operate. As the core component of the electric drive device, how to improve the working performance of the motor is an urgent technical problem in the electric drive technology. Summary of the Utility Model

[0003] The purpose of the embodiments of the present application is to provide a motor, an electric drive device, an electric drive system, and an electric device to solve the technical problem of poor working performance of the motor in the related art.

[0004] To achieve the above purpose, the technical solution adopted in the embodiments of the present application is: to provide a motor, including:

[0005] A first housing having a stator cavity and a rotor cavity separated from each other;

[0006] A stator accommodated in the stator cavity;

[0007] A rotor accommodated in the rotor cavity, with a first air gap formed between the rotor and the stator. The first air gap is located in the rotor cavity and is used for circulating an atomized cooling medium.

[0008] The motor provided by the embodiments of the present application has at least the following beneficial effects: the motor provided by the embodiments of the present application circulates the atomized cooling medium in the first air gap, and the atomized cooling medium can directly absorb the heat generated by the rotor during operation, effectively improving the cooling effect of the rotor. At the same time, compared with the traditional liquid cooling medium, the atomized cooling medium has less resistance acting on the rotor, effectively reducing the oil churning loss of the rotor, thereby effectively improving the working performance of the motor.

[0009] In some embodiments of the present application, the stator cavity is used to accommodate a coolant, and at least part of the stator is immersed in the coolant.

[0010] By adopting the above technical solution, not only can the cooling effect of the stator be effectively improved, but also by circulating the atomized cooling medium in the first air gap, the thermal resistance of the first air gap can be reduced, so that the heat generated by the rotor during operation can be more efficiently transferred to the coolant in the stator cavity through the atomized cooling medium, further improving the cooling effect of the rotor, and thus further improving the working performance of the motor.

[0011] In some embodiments of the present application, the motor further includes an atomizing element, which is used to atomize the coolant to form an atomized cooling medium.

[0012] By adopting the above technical solution, the atomizer can directly atomize the coolant in the stator cavity to form an atomized cooling medium, without the need to set up an additional delivery channel inside the motor and use an external device to deliver the atomized cooling medium to the first air gap, thereby effectively simplifying the structure of the motor.

[0013] In some embodiments of the present application, the first housing includes a first shell and a partition, the partition is arranged in the first shell to separate the internal space of the first shell into a stator cavity and a rotor cavity, and the atomizer is installed on the partition.

[0014] By adopting the above technical solution, the path of atomizing the coolant to form an atomized cooling medium is effectively shortened, and the atomized cooling medium can be replenished to the first air gap more quickly, further improving the cooling effect of the rotor, thereby further improving the working performance of the motor.

[0015] In some embodiments of the present application, a mounting hole is formed on the partition, the mounting hole connects the stator cavity and the rotor cavity, and the atomizer includes an atomizer body, which is installed in the mounting hole.

[0016] By adopting the above technical solution, it is convenient to install the atomizing element on the partition.

[0017] In some embodiments of the present application, the atomizer also includes a wiring harness electrically connected to the atomizer body, and the partition is further provided with a wire outlet hole connected to the mounting hole, and the wire harness is passed through the wire outlet hole.

[0018] By adopting the above technical solution, it is convenient to lead the wiring harness outward and electrically connect it to the controller to realize power supply and control of the atomizer.

[0019] In some embodiments of the present application, the motor further includes a rotating shaft coaxially connected to the rotor, the first housing has an axial cavity for accommodating the rotating shaft, and the wire outlet hole communicates with the mounting hole and the axial cavity.

[0020] By adopting the above technical solution, the interference of the wiring harness on other components of the motor can be reduced, making it easier to lead the wiring harness outward.

[0021] In some embodiments of the present application, the atomizing body is sealingly connected to the hole wall of the mounting hole.

[0022] By adopting the above technical solution, the risk of coolant leakage into the rotor cavity is effectively reduced, and the oil stirring loss of the rotor is further reduced, thereby further improving the working performance of the motor.

[0023] In some embodiments of the present application, the motor further includes a seal, which is disposed between the atomization main body and the hole wall of the mounting hole to seal and connect the atomization main body and the hole wall of the mounting hole.

[0024] By adopting the above technical solution, the sealing effect between the atomization main body and the hole wall of the mounting hole is effectively improved.

[0025] In some embodiments of the present application, the number of atomization members is multiple, and the multiple atomization members are arranged around the central axis of the motor.

[0026] By adopting the above technical solution, the atomized cooling medium can be provided to the first air gap more uniformly, further improving the cooling effect of the rotor, and thus further improving the working performance of the motor.

[0027] In some embodiments of the present application, the motor further includes a rotating shaft coaxially connected to the rotor. A conveying channel is formed inside the rotating shaft, and through holes are provided on the shaft wall of the rotating shaft. The through holes communicate the first air gap and the conveying channel, and the conveying channel is used to connect the atomization device to convey the atomized cooling medium to the first air gap.

[0028] By adopting the above technical solution, the heat generated by the rotor during operation can not only be directly absorbed by the atomized cooling medium in the first air gap, but also be transferred to the rotating shaft and absorbed by the atomized cooling medium in the conveying channel, further improving the cooling effect of the rotor, and thus further improving the working performance of the motor.

[0029] In some embodiments of the present application, the number of through holes is multiple, and the multiple through holes are arranged around the central axis of the motor.

[0030] By adopting the above technical solution, the atomized cooling medium can be provided to the first air gap more uniformly, further improving the cooling effect of the rotor, and thus further improving the working performance of the motor.

[0031] In some embodiments of the present application, the first housing is provided with a first outlet communicating with the rotor cavity, and a diversion groove is provided on the inner peripheral wall of the rotor cavity, and the diversion groove is communicated with the first outlet.

[0032] By adopting the above technical solution, the atomized cooling medium in the rotor cavity can gather in the diversion groove under the action of gravity, flow along the diversion groove to the first outlet, and finally be discharged to the outside of the rotor cavity through the first outlet, effectively improving the accumulation of the atomized cooling medium in the rotor cavity, further reducing the oil stirring loss of the rotor, and thus further improving the working performance of the motor.

[0033] In some embodiments of the present application, the first outlet is opened on the bottom of the first housing.

[0034] By adopting the above technical solution, the atomized cooling medium in the rotor cavity can flow more quickly along the diversion groove to the first outlet under the action of gravity, effectively improving the discharge efficiency of the atomized cooling medium, further improving the accumulation of the atomized cooling medium in the rotor cavity, further reducing the oil churning loss of the rotor, and thus further enhancing the working performance of the motor.

[0035] In some embodiments of the present application, the number of stators is two, and the two stators are respectively arranged on opposite sides of the rotor along the axial direction.

[0036] By adopting the above technical solution, the working performance of the double-stator motor is effectively improved.

[0037] The embodiment of the present application further provides an electric drive device, including the motor described in any one of the above embodiments.

[0038] The electric drive device provided by the embodiment of the present application has at least the following beneficial effects: Since the electric drive device provided by the embodiment of the present application adopts the motor described in any one of the above embodiments, the working performance of the electric drive device is effectively improved.

[0039] The embodiment of the present application further provides an electric drive system, including a battery and the above electric drive device, and the battery is electrically connected to the motor.

[0040] The electric drive system provided by the embodiment of the present application has at least the following beneficial effects: Since the electric drive system provided by the embodiment of the present application adopts the above electric drive device, the working performance of the electric drive system is effectively improved.

[0041] The embodiment of the present application further provides an electric device, including the above electric drive device or the above electric drive system.

[0042] The electric device provided by the embodiment of the present application has at least the following beneficial effects: Since the electric device provided by the embodiment of the present application adopts the above electric drive device or the above electric drive system, the working performance of the electric device is effectively improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0044] Figure 1 It is a schematic structural diagram of a vehicle provided by an embodiment of the present application;

[0045] Figure 2Explosion structure schematic diagram of the battery provided by the embodiment of the present application;

[0046] Figure 3 Structure schematic diagram of the electric drive device provided by the embodiment of the present application;

[0047] Figure 4 Structure schematic diagram of the motor provided by an embodiment of the present application;

[0048] Figure 5 is Figure 4 Cross-sectional structure schematic diagram of the motor shown along the line A-A;

[0049] Figure 6 is Figure 5 Enlarged structure schematic diagram at position B of the motor shown;

[0050] Figure 7 is Figure 5 Structure schematic diagram of the atomizing member in the motor shown;

[0051] Figure 8 Structure schematic diagram of the motor provided by another embodiment of the present application.

[0052] Among them, each reference numeral in the figure:

[0053] 1, electric drive device;

[0054] 10, motor; 11, first housing; 111, first shell; 112, partition; 1121, mounting hole; 1122, wire outlet hole; 1123, limiting groove; 113, cylinder; 1131, shaft cavity; 114, stator cavity; 115, rotor cavity; 116, air gap; 1161, first air gap; 1162, second air gap; 117, diversion groove; 118, first outlet; 12, stator; 13, rotor; 14, atomizing member; 141, atomizing main body; 142, wire harness; 15, rotating shaft; 151, conveying channel; 152, through hole; 16, seal; 20, controller; 30, speed change mechanism;

[0055] 2, battery;

[0056] 21, box body; 211, first part; 212, second part;

[0057] 22, battery cell;

[0058] 3, vehicle body. Detailed implementation manners

[0059] In order to make the technical problems, technical solutions and beneficial effects to be solved by this application more clearly understood, the following further details this application in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not used to limit this application.

[0060] 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.

[0061] It should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing this application and simplifying the description, rather than indicating or implying 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 construed as a limitation to this application.

[0062] In addition, the terms "first", "second", "third", "fourth", "fifth", "sixth", "seventh", "eighth", "ninth", "tenth" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second", "third", "fourth", "fifth", "sixth", "seventh", "eighth", "ninth", "tenth" may explicitly or implicitly include one or more of such features. In the description of this application, "a plurality" means two or more, unless otherwise specifically defined.

[0063] The motor is the power device of the electric equipment. The motor is used to convert electrical energy into mechanical energy to drive the electric equipment to operate. The motor generally includes a stator, a rotor and a rotating shaft, and the rotating shaft is coaxially connected to the rotor. During the operation of the motor, current is passed through the windings of the stator to generate a rotating magnetic field. Under the action of the rotating magnetic field, the rotor rotates to drive the rotating shaft to rotate. In the above process, eddy currents will be induced in the rotor under the action of the changing magnetic field, and heat will be generated when the eddy currents flow through the rotor, thus causing the rotor to heat up.

[0064] In the related art, a cooling channel is formed inside the rotating shaft. By circulating cooling oil in the cooling channel, the heat generated by the rotor during operation can be transferred to the cooling oil through the rotating shaft to achieve cooling of the rotor. However, the thermal resistance of the heat conduction path of such a cooling method is large, and the cooling effect is poor. In order to improve the cooling effect of the rotor, a through hole is opened on the shaft wall of the rotating shaft. During the rotation of the rotor, the cooling oil in the cooling channel can be thrown onto the rotor through the through hole, so that the cooling oil can directly contact the rotor and absorb the heat generated by the rotor during operation. However, due to the high viscosity of the cooling oil, the rotation resistance of the rotor increases, and the oil stirring loss increases accordingly, resulting in a decrease in the performance of the motor.

[0065] In order to improve the performance of the motor, the motor provided in the embodiment of the present application circulates an atomized cooling medium in the first air gap. The atomized cooling medium can directly absorb the heat generated by the rotor during operation, thereby effectively improving the cooling effect of the rotor. At the same time, compared with traditional liquid cooling media, the atomized cooling medium has less resistance acting on the rotor, thereby effectively reducing the oil stirring loss of the rotor, thereby effectively improving the working performance of the motor.

[0066] The technical solutions described in the embodiments of the present application are applicable to electric drive devices using motors and electric devices using electric drive devices. Among them, the electric devices may be, but are not limited to, vehicles, ships, spacecraft, electric toys, and the like. The vehicle may be a fuel vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, and the like. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, and the like. Electric toys include fixed or mobile electric toys, for example, electric car toys, electric ship toys, and electric airplane toys, and the like.

[0067] For the convenience of description, the following embodiments are described by taking the electric device of one embodiment of the present application as a vehicle as an example.

[0068] See also Figure 1 , Figure 1Schematic structural diagram of a vehicle provided by an embodiment of the present application. The vehicle includes a vehicle body 3, a battery 2, and an electric drive device 1. The vehicle body 3 is the main support component of the vehicle. The vehicle body 3 has an engine compartment and a driver and passenger compartment. Among them, the engine compartment is used to accommodate the electric drive device 1, and the driver and passenger compartment is used to provide an operating space and a seating space for the driver and passengers. When the vehicle is a front-wheel drive vehicle, the engine compartment is arranged at the head of the vehicle body 3, that is, the engine compartment is a front engine compartment; when the vehicle is a rear-wheel drive vehicle, the engine compartment is arranged at the tail of the vehicle body 3, that is, the engine compartment is a rear engine compartment; when the vehicle is a four-wheel drive vehicle, the engine compartment is divided into a front engine compartment and a rear engine compartment. The front engine compartment is arranged at the head of the vehicle body 3, and the rear engine compartment is arranged at the tail of the vehicle body 3. The number of electric drive devices 1 can be two, and the two electric drive devices 1 are respectively arranged in the front engine compartment and the rear engine compartment. The battery 2 and the electric drive device 1 together form the electric drive system of the vehicle. The battery 2 can be arranged at the bottom, head or tail of the vehicle. The battery 2 can be used to supply power to the electric drive device 1 to drive the electric drive device 1 to operate. The electric drive device 1 is used to convert the electrical energy provided by the battery 2 into mechanical energy and output the mechanical energy to the wheels of the vehicle to drive the vehicle to travel.

[0069] Please refer to Figure 2 , Figure 2 Explosion schematic diagram of the battery 2 provided by an embodiment of the present application. The battery 2 includes a box body 21 and battery cells 22, and the battery cells 22 are accommodated in the box body 21. Among them, the box body 21 is used to provide an accommodation space for the battery cells 22, and the box body 21 can adopt various structures. In some embodiments, the box body 21 can include a first part 211 and a second part 212. The first part 211 and the second part 212 cover each other, and the first part 211 and the second part 212 jointly define an accommodation space for accommodating the battery cells 22. The second part 212 can be a hollow structure with one end open, and the first part 211 can be a plate-like structure. The first part 211 covers the open side of the second part 212 so that the first part 211 and the second part 212 jointly define an accommodation space; the first part 211 and the second part 212 can also both be hollow structures with one side open, and the open side of the first part 211 covers the open side of the second part 212 so that the first part 211 and the second part 212 jointly define an accommodation space. Of course, the box body 21 formed by the first part 211 and the second part 212 can be various shapes, such as a cylinder, a cuboid, etc., which are not specifically limited herein.

[0070] In some embodiments, the box body 21 can be used as a part of the chassis structure of the vehicle. For example, a part of the box body 21 can become at least a part of the floor of the vehicle, or a part of the box body 21 can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0071] Of course, in some embodiments, the battery 2 may not include the housing 21. Instead, a plurality of battery cells 22 are electrically connected and assembled into a vehicle after forming an integral body through necessary fixing structures.

[0072] In the battery 2, there may be a plurality of battery cells 22. The plurality of battery cells 22 can be connected in series, in parallel, or in a series-parallel combination. A series-parallel combination means that there are both series and parallel connections among the plurality of battery cells 22. The plurality of battery cells 22 can be directly connected in series, in parallel, or in a series-parallel combination, and then the integral body formed by the plurality of battery cells 22 is accommodated in the housing 21. Of course, the battery 2 can also be that a plurality of battery cells 22 are first connected in series, in parallel, or in a series-parallel combination to form battery modules, and then the plurality of battery modules are connected in series, in parallel, or in a series-parallel combination to form an integral body and are accommodated in the housing 21. The battery 2 may further include other functional components. For example, the battery 2 may further include a busbar for realizing the electrical connection among the plurality of battery cells 22.

[0073] Among them, each battery cell 22 can be a secondary battery cell or a primary battery cell. A secondary battery cell refers to a battery cell 22 that can be activated by charging after discharging so as to continue to be used, and a primary battery cell refers to a battery cell 22 that cannot be activated by charging to continue to be used after the electrical energy is exhausted; the battery cell 22 can also be a lithium-ion battery cell, a sodium-ion battery cell, a sodium-lithium-ion battery cell, a lithium-metal battery cell, a sodium-metal battery cell, a lithium-sulfur battery cell, a magnesium-ion battery cell, a nickel-metal hydride battery cell, a nickel-cadmium battery cell, a lead-acid battery cell, etc., but is not limited thereto. The battery cell 22 can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell 22 with other shapes. The prismatic battery cell includes a square-shell battery cell, a blade-shaped battery cell, and a multi-prismatic battery cell. The multi-prismatic battery cell is, for example, a hexagonal-prismatic battery cell, etc., and there is no special limitation in this application.

[0074] Please refer to Figure 3 , Figure 3Schematic diagram of the structure of the electric drive device 1 provided by the embodiments of the present application. The electric drive device 1 includes a motor 10, and the motor 10 is used to convert the electrical energy provided by the battery 2 into mechanical energy. The motor 10 can be, but is not limited to, an axial flux motor, a radial flux motor, a servo motor, a brushed motor, a brushless motor, etc. In some embodiments, the number of motors 10 is two, and the two motors 10 are coaxially arranged, that is, the central axes of the two motors 10 coincide. The "central axis" of the motor 10 refers to the axial center line of the rotating shaft 15 (or "rotor shaft") of the motor 10. As an example, the rotating shaft 15 of one motor 10 is connected to one of the left front wheel and the right front wheel of the vehicle, and the rotating shaft 15 of the other motor 10 is connected to the other of the left front wheel and the right front wheel of the vehicle, or the rotating shaft 15 of one motor 10 is connected to one of the left rear wheel and the right rear wheel of the vehicle, and the rotating shaft 15 of the other motor 10 is connected to the other of the left rear wheel and the right rear wheel of the vehicle. During the operation of the electric drive device 1, the rotational speeds of the two motors 10 can be the same, or the rotational speeds of the two motors 10 can also be different.

[0075] Of course, in other embodiments, the number of motors 10 can also be one.

[0076] In some embodiments, the electric drive device 1 may further include a controller 20. The controller 20 is used to convert the direct current output by the battery 2 into alternating current and deliver the alternating current to the motor 10. The controller 20 can also be used to control the operation of the motor 10. For example, the controller 20 is used to control the start and stop, rotational speed, torque, etc. of the motor 10. In other words, both the motor 10 and the battery 2 are electrically connected to the controller 20. The direct current output by the battery 2 can be delivered to the controller 20 through the current transmission path between the battery 2 and the controller 20. After the controller 20 converts the direct current into alternating current, the alternating current can be delivered to the motor 10 through the current transmission path between the controller 20 and the motor 10 to drive the motor 10 to operate. At the same time, the control signal of the controller 20 can be transmitted to the motor 10 through the current transmission path between the controller 20 and the motor 10, and the operating state signal of the motor 10 can be transmitted to the controller 20 through the current transmission path between the controller 20 and the motor 10 to realize the control of the motor 10 by the controller 20.

[0077] In some embodiments, the electric drive device 1 may further include a speed-changing mechanism 30. The speed-changing mechanism 30 is configured to transfer the above-mentioned mechanical energy to the wheels of the vehicle in a manner of changing the rotational speed and torque of the motor 10. For example, the speed-changing mechanism 30 transfers the above-mentioned mechanical energy to the wheels of the vehicle in a manner of reducing the rotational speed of the motor 10 and increasing the torque of the motor 10. Another example is that the speed-changing mechanism 30 transfers the above-mentioned mechanical energy to the wheels of the vehicle in a manner of increasing the rotational speed of the motor 10 and reducing the torque of the motor 10. The speed-changing mechanism 30 may be, but is not limited to, a gear-shaft speed-changing mechanism, a worm speed-changing mechanism, a planetary gear speed-changing mechanism, a continuously variable transmission mechanism, etc.

[0078] To illustrate the technical solutions provided by the present application, the following will be described in detail with reference to specific drawings and embodiments.

[0079] In a first aspect, please refer to Figures 4 to 8 , an embodiment of the present application provides a motor 10, including a first housing 11, a stator 12, and a rotor 13. The first housing 11 has a stator cavity 114 and a rotor cavity 115 that are separated from each other. The stator 12 is accommodated in the stator cavity 114, and the rotor 13 is accommodated in the rotor cavity 115. A first air gap 1161 is formed between the rotor 13 and the stator 12. The first air gap 1161 is located in the rotor cavity 115 and is used for circulating an atomized cooling medium.

[0080] The first housing 11 is a component for providing an installation environment for the stator 12 and the rotor 13. Among them, at least a part of the installation environment constitutes the above-mentioned stator cavity 114, and at least another part of the installation environment constitutes the above-mentioned rotor cavity 115. The first housing 11 may be an integrally formed component or an assembled component assembled from multiple parts. The material of the first housing 11 may be, but is not limited to, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0081] In some embodiments, the motor 10 further includes a second housing (not shown in the figure), and the second housing is used to provide the internal environment of the motor 10, and the first housing 11, the stator 12, and the rotor 13 are all accommodated in this internal environment. The second housing can be an integrally formed member or an assembled member assembled from multiple parts. As an example, for the convenience of assembling the first housing 11, the stator 12, and the rotor 13 into the internal environment of the motor 10, the housing can include a second housing body and an end cover. The second housing body defines the internal environment of the motor 10. The stator 12 can be first installed in the stator cavity 114 and the rotor 13 can be installed in the rotor cavity 115, and then the first housing 11, the stator 12, and the rotor 13 are installed as a whole in this internal environment. After completing the assembly operation of the first housing 11, the stator 12, and the rotor 13, the end cover is covered at the opening of the second housing body to isolate the internal environment of the motor 10 from the external environment of the motor 10. The material of the second housing can be, but is not limited to, copper, iron, aluminum, stainless steel, aluminum alloy, etc.

[0082] The stator 12 is the fixed part of the motor 10 and is used to drive the rotor 13 to rotate. In some embodiments, the stator 12 can include an iron core and windings. The iron core is fixedly installed in the stator cavity 114, and the windings are wound around the iron core. As an example, the iron core is provided with winding grooves, and the windings are wound in the winding grooves.

[0083] The rotor 13 is the rotating part of the motor 10. In some embodiments, the rotor 13 can include a cage and permanent magnets, and the permanent magnets are installed on the cage. As an example, the cage is provided with installation grooves, and the permanent magnets are installed in the installation grooves. The number of permanent magnets can be multiple, and the multiple permanent magnets are arranged around the central axis of the motor 10. Correspondingly, the number of installation grooves is also multiple, and the multiple permanent magnets are arranged in one-to-one correspondence with the installation grooves.

[0084] During the operation of the motor 10, current can be input into the windings to cause the windings to generate a rotating magnetic field. The iron core is used to conduct this rotating magnetic field so that the rotating magnetic field acts on the rotor 13, thereby driving the rotor 13 to rotate.

[0085] The stator 12 and the rotor 13 are separated to form an air gap 116. The air gap 116 is used to prevent the rotor 13 in the motor 10 from directly contacting the stator 12, thereby reducing noise and mechanical damage caused by friction and wear. At least a part of the air gap 116 is located in the rotor cavity 115 and constitutes the above-mentioned first air gap 1161, and at least another part of the air gap 116 is located in the stator cavity 114 and constitutes the second air gap 1162. During the operation of the motor 10, an atomized cooling medium flows in the first air gap 1161. The atomized cooling medium can be formed by atomizing a coolant, and the coolant can be, but is not limited to, cooling oil, water, etc.

[0086] In some embodiments, the motor 10 is an axial flux motor 10, and the stator 12 and the rotor 13 are separated along the axis direction of the motor 10 to form the air gap 116 as described above.

[0087] As an example, the number of stators 12 is two. Correspondingly, the first housing 11 has two stator cavities 114, and the two stator cavities 114 are disposed on opposite sides of the rotor cavity 115 along the axis direction of the motor 10. One stator 12 is accommodated in one stator cavity 114, and the other stator 12 is accommodated in the other stator cavity 114. One stator 12 and the rotor 13 are separated along one side of the axis direction of the motor 10 to form an air gap 116, and the other stator 12 and the rotor 13 are separated along the other side of the axis direction of the motor 10 to form another air gap 116. During the operation of the motor 10, the first air gap 1161 of the two air gaps 116 is both circulated with an atomized cooling medium.

[0088] As an example, the number of rotors 13 is two. Correspondingly, the first housing 11 has two rotor cavities 115, and the two rotor cavities 115 are disposed on opposite sides of the stator cavity 114 along the axis direction of the motor 10. One rotor 13 is accommodated in one rotor cavity 115, and the other rotor 13 is accommodated in the other rotor cavity 115. One rotor 13 and the stator 12 are separated along one side of the axis direction of the motor 10 to form an air gap 116, and the other rotor 13 and the stator 12 are separated along the other side of the axis direction of the motor 10 to form another air gap 116. During the operation of the motor 10, the first air gap 1161 of the two air gaps 116 is both circulated with an atomized cooling medium.

[0089] Of course, in other embodiments, the motor 10 can also be a radial flux motor 10, and the stator 12 and the rotor 13 are separated along the radial direction of the motor 10 to form the air gap 116 as described above.

[0090] The motor 10 provided by the embodiment of the present application circulates an atomized cooling medium in the first air gap 1161. The atomized cooling medium can directly absorb the heat generated by the rotor 13 during operation, effectively improving the cooling effect of the rotor 13. At the same time, compared with the traditional liquid cooling medium, the atomized cooling medium has less resistance acting on the rotor 13, effectively reducing the oil churning loss of the rotor 13, thereby effectively improving the working performance of the motor 10.

[0091] In some embodiments of the present application, the stator cavity 114 is used to accommodate a coolant, and at least a part of the stator 12 is immersed in the coolant.

[0092] The coolant is a medium used to absorb the heat generated by the stator 12 and other heat-generating components. The coolant can be but not limited to cooling oil, water, etc. The stator 12 can be partially immersed in the coolant or fully immersed in the coolant.

[0093] In some embodiments, the coolant may enter the stator cavity 114 during the circulating flow. As an example, the first housing 11 is provided with an inlet and a second outlet. The inlet is connected to the liquid outlet of the liquid supply device, and the second outlet is connected to the liquid return port of the liquid supply device. The liquid supply device transports the coolant to the stator cavity 114 through the inlet, and the coolant flows back to the liquid supply device through the second outlet, so that the coolant circulates in the stator cavity 114.

[0094] Of course, in other embodiments, the coolant may also be statically placed in the stator cavity 114.

[0095] By adopting the above technical solution, not only can the cooling effect of the stator 12 be effectively improved, but also by circulating the atomized cooling medium in the first air gap 1161, the thermal resistance of the first air gap 1161 can be reduced, so that the heat generated by the rotor 13 during operation can be more efficiently transferred to the coolant in the stator cavity 114 through the atomized cooling medium, further improving the cooling effect of the rotor 13, thereby further improving the working performance of the motor 10.

[0096] In some embodiments of the present application, please refer to Figures 4 to 7 together, the motor 10 further includes an atomizing member 14, and the atomizing member 14 is used to atomize the coolant to form an atomized cooling medium.

[0097] The atomizing member 14 is a component used to atomize the coolant to form an atomized cooling medium. The atomizing member 14 can be, but is not limited to, an ultrasonic atomizing member, a compression atomizing member, a filter screen atomizing member, etc. The atomizing member 14 can be disposed between the stator cavity 114 and the rotor cavity 115, the atomizing member 14 can also be disposed in the stator cavity 114, and the atomizing member 14 can also be disposed in the rotor cavity 115.

[0098] In some embodiments, the atomizing member 14 is electrically connected to the above-mentioned controller 20 to control the operation of the atomizing member 14 and supply power to the atomizing member 14.

[0099] By adopting the above technical solution, the atomizing member 14 can directly atomize the coolant in the stator cavity 114 to form an atomized cooling medium, without the need to additionally provide a conveying channel 151 inside the motor 10 and use an external device to transport the atomized cooling medium to the first air gap 1161, thereby effectively simplifying the structure of the motor 10.

[0100] In some embodiments of the present application, please refer to Figure 5 and Figure 6 together, the first housing 11 includes a first housing body 111 and a partition plate 112. The partition plate 112 is disposed inside the first housing body 111 to divide the internal space of the first housing body 111 into a stator cavity 114 and a rotor cavity 115, and the atomizing member 14 is installed on the partition plate 112.

[0101] The first housing 111 is the main part of the first outer shell 11 and is used to provide an installation environment for the stator 12 and the rotor 13.

[0102] The partition 112 is a component for separating the stator cavity 114 and the rotor cavity 115. The partition 112 is connected inside the first housing 111. Specifically, the partition 112 is hermetically connected to the first housing 111. On one side of the partition 112, a stator cavity 114 is formed, and on the other side of the partition 112, a rotor cavity 115 is formed. The partition 112 and the first housing 111 may be an integrally formed member. For example, the partition 112 and the first housing 111 are integrally formed by an injection molding process. The partition 112 and the first housing 111 may also be formed separately and then connected to each other as a whole.

[0103] In some embodiments, referring to Figure 5 , the number of stators 12 is two. The first outer shell 11 has two stator cavities 114. The two stator cavities 114 are respectively disposed on opposite sides of the rotor cavity 115 along the axis direction of the motor 10. One stator 12 is accommodated in one stator cavity 114, and the other stator 12 is accommodated in the other stator cavity 114. Correspondingly, the number of partitions 112 is two. A rotor cavity 115 is formed between the two partitions 112. One stator cavity 114 is formed on one side of one partition 112 facing away from the rotor cavity 115, and the other stator cavity 114 is formed on one side of the other partition 112 facing away from the rotor cavity 115.

[0104] In other embodiments, the number of rotors 13 is two. The first outer shell 11 has two rotor cavities 115. The two rotor cavities 115 are respectively disposed on opposite sides of the stator cavity 114 along the axis direction of the motor 10. One rotor 13 is accommodated in one rotor cavity 115, and the other rotor 13 is accommodated in the other rotor cavity 115. Correspondingly, the number of partitions 112 is two. A stator cavity 114 is formed between the two partitions 112. One rotor cavity 115 is formed on one side of one partition 112 facing away from the stator cavity 114, and the other rotor cavity 115 is formed on one side of the other partition 112 facing away from the stator cavity 114.

[0105] The atomizing member 14 is installed on the partition 112. The atomizing member 14 may be installed on the side of the partition 112 facing the stator cavity 114, or the atomizing member 14 may be installed on the side of the partition 112 facing the rotor cavity 115, or the atomizing member 14 may also be installed inside the partition 112.

[0106] By adopting the above technical solution, the path for atomizing the coolant to form the atomized cooling medium is effectively shortened, and the atomized cooling medium can be more quickly replenished to the first air gap 1161, further improving the cooling effect of the rotor 13, and thus further improving the working performance of the motor 10.

[0107] In some embodiments of the present application, please refer to Figures 5 to 7 , a partition plate 112 is provided with a mounting hole 1121, the mounting hole 1121 communicates with the stator cavity 114 and the rotor cavity 115, the atomizing member 14 includes an atomizing body 141, and the atomizing body 141 is mounted in the mounting hole 1121.

[0108] The mounting hole 1121 is used to provide a mounting space for the atomizing body 141. The mounting hole 1121 communicating with the stator cavity 114 and the rotor cavity 115 means that the mounting hole 1121 penetrates through the partition plate 112 along the direction from the stator cavity 114 to the rotor cavity 115. In the case where the atomizing body 141 is not mounted to the mounting hole 1121, the coolant in the stator cavity 114 can directly enter the rotor cavity 115 through the mounting hole 1121.

[0109] The atomizing body 141 is the main functional component of the atomizing member 14. After the coolant contacts the atomizing body 141, the atomizing body 141 can atomize the coolant to form an atomized cooling medium. The mounting manner of the atomizing body 141 can be, but is not limited to, fastening manner, snap - fitting manner, bonding manner, etc. In some embodiments, the atomizing body 141 has a sheet - like structure. The shape of the atomizing body 141 is adapted to the shape of the mounting hole 1121. For example, both the shape of the atomizing body 141 and the shape of the mounting hole 1121 are circular.

[0110] By adopting the above - mentioned technical solution, it is convenient to mount the atomizing member 14 on the partition plate 112.

[0111] In some embodiments of the present application, please refer to Figures 5 to 7 , the atomizing member 14 further includes a wire harness 142 electrically connected to the atomizing body 141, and the partition plate 112 is further provided with an outlet hole 1122 communicating with the mounting hole 1121, and the wire harness 142 is threaded through the outlet hole 1122.

[0112] The wire harness 142 is a component for transmitting electric energy and electrical signals to the atomizing body 141. In some embodiments, one end of the wire harness 142 is electrically connected to the atomizing body 141, and the other end of the wire harness 142 can be electrically connected to the above - mentioned controller 20 to control and drive the atomizing body 141 to work.

[0113] The outlet hole 1122 is used to provide a leading - out space for the wire harness 142. It can be understood that the outlet hole 1122 communicates the mounting hole 1121 and the external environment of the first housing 11, so that the wire harness 142 can be led out from the mounting hole 1121 through the outlet hole 1122 to the external environment of the first housing 11.

[0114] By adopting the above - mentioned technical solution, it is convenient to lead out the wire harness 142 outward and electrically connect it to the controller 20 to realize power supply and control of the atomizing member 14.

[0115] In some embodiments of the present application, please refer to Figure 6 , the motor 10 further includes a rotating shaft 15 coaxially connected to the rotor 13. The first housing 11 has a shaft cavity 1131 for accommodating the rotating shaft 15, and the wire outlet hole 1122 communicates with the mounting hole 1121 and the shaft cavity 1131.

[0116] The rotating shaft 15 is a component for outputting the rotational kinetic energy of the rotor 13. The rotating shaft 15 being coaxially connected to the rotor 13 means that the rotating shaft 15 is fixedly connected to the rotor 13, and the central axis of the rotating shaft 15 coincides with the central axis of the rotor 13.

[0117] In some embodiments, the motor 10 further includes bearings, which are installed on the second housing and sleeved on the rotating shaft 15. As an example, the number of bearings can be two, and the two bearings are respectively arranged at opposite ends of the rotating shaft 15.

[0118] The shaft cavity 1131 is used to provide a space for the rotating shaft 15 to extend out, that is, the rotating shaft 15 can extend out of the first housing 11 into the external environment through the shaft cavity 1131. It can be understood that at least a part of the rotating shaft 15 is accommodated in the rotor cavity 115, and at least another part of the rotating shaft 15 is accommodated in the shaft cavity 1131.

[0119] In some embodiments, please refer to Figure 5 , the number of the stators 12 and the partitions 112 is both two. A rotor cavity 115 is formed between the two partitions 112. The first housing 11 includes two cylinders 113. One cylinder 113 is hermetically connected between the first housing body 111 and one partition 112 to define a stator cavity 114, and the other cylinder 113 is hermetically connected between the first housing body 111 and the other partition 112 to define another stator cavity 114. The two stators 12 are respectively arranged in the two stator cavities 114. The internal spaces of the two cylinders 113 both constitute the above-mentioned shaft cavity 1131. The two partitions 112 are both provided with shaft holes, and the rotating shaft 15 passes through the shaft holes and extends into the shaft cavity 1131.

[0120] In some other embodiments, the number of the rotors 13 and the partitions 112 is both two. The first housing 11 includes a cylinder 113, which is hermetically connected between the two partitions 112 and jointly defines a stator cavity 114 with the first housing body 111 and the two partitions 112. The space on one side of one partition 112 facing away from the stator cavity 114 constitutes a rotor cavity 115, and the space on one side of the other partition 112 facing away from the stator cavity 114 constitutes another rotor cavity 115. The two rotors 13 are respectively arranged in the two rotor cavities 115. The internal space of the cylinder 113 constitutes the above-mentioned shaft cavity 1131, and the rotating shaft 15 is arranged in the shaft cavity 1131 and coaxially connected to the two rotors 13.

[0121] By adopting the above technical solution, the interference caused by the wire harness 142 to other components of the motor 10 can be reduced, and it is more convenient to lead the wire harness 142 outwards.

[0122] In some embodiments of the present application, the atomization main body 141 is hermetically connected to the hole wall of the mounting hole 1121.

[0123] The hermetic connection between the atomization main body 141 and the hole wall of the mounting hole 1121 means that the gap between the atomization main body 141 and the hole wall of the mounting hole 1121 is blocked, so that the coolant cannot enter the rotor cavity 115 through the gap between the atomization main body 141 and the hole wall of the mounting hole 1121.

[0124] By adopting the above technical solution, the risk of coolant leakage into the rotor cavity 115 is effectively reduced, and the oil stirring loss of the rotor 13 is further reduced, thereby further improving the working performance of the motor 10.

[0125] In some embodiments of the present application, please refer to Figure 5 and Figure 6 , the motor 10 further includes a seal 16, and the seal 16 is arranged between the atomization main body 141 and the hole wall of the mounting hole 1121 to hermetically connect the atomization main body 141 and the hole wall of the mounting hole 1121.

[0126] The seal 16 is a component used to block the gap between the atomization main body 141 and the hole wall of the mounting hole 1121. The seal 16 can be made of a flexible material, and the flexible material can be, but not limited to, rubber, silicone, etc.

[0127] In some embodiments, the seal 16 has an annular structure, and the seal 16 is sleeved on the outer peripheral side of the atomization main body 141 and pressed against the gap between the atomization main body 141 and the hole wall of the mounting hole 1121. As an example, a limiting groove 1123 is formed on the hole wall of the mounting hole 1121, and the seal 16 is embedded in the limiting groove 1123 to limit the position of the seal 16.

[0128] By adopting the above technical solution, the sealing effect between the atomization main body 141 and the hole wall of the mounting hole 1121 is effectively improved.

[0129] Of course, in other embodiments, an adhesive may also be filled between the atomization main body 141 and the hole wall of the mounting hole 1121 to hermetically connect the atomization main body 141 and the hole wall of the mounting hole 1121.

[0130] In some embodiments of the present application, please refer to Figure 5 , the number of the atomizing members 14 is multiple, and the multiple atomizing members 14 are arranged around the central axis of the motor 10.

[0131] The number of the atomizing members 14 can be determined according to actual application requirements, and specifically can be 4, 6, 8, 10, etc.

[0132] The arrangement that multiple atomizing members 14 surround the central axis of the motor 10 means that the multiple atomizing members 14 are circumferentially distributed along the motor 10. In some embodiments, the multiple atomizing members 14 are evenly circumferentially distributed along the motor 10, that is, in the circumferential direction of the motor 10, the distance between two adjacent atomizing members 14 is equal.

[0133] By adopting the above technical solution, the atomizing cooling medium can be provided more evenly into the first air gap 1161, further improving the cooling effect of the rotor 13, and thus further improving the working performance of the motor 10.

[0134] In some other embodiments of the present application, please refer to Figure 8 , the motor 10 further includes a rotating shaft 15 coaxially connected to the rotor 13. A conveying channel 151 is formed inside the rotating shaft 15. A through hole 152 is formed in the shaft wall of the rotating shaft 15. The through hole 152 communicates the first air gap 1161 and the conveying channel 151. The conveying channel 151 is used to connect an atomizing device to convey the atomizing cooling medium into the first air gap 1161.

[0135] The conveying channel 151 extends along the axial direction of the rotating shaft 15. The through hole 152 penetrates the shaft wall of the rotating shaft 15. As an example, the through hole 152 penetrates the shaft wall of the rotating shaft 15 along the radial direction of the rotating shaft 15. The conveying channel 151, the through hole 152 and the first air gap 1161 are sequentially communicated to form a flow channel for the atomizing cooling medium, that is, the atomizing cooling medium provided by the atomizing device can enter the first air gap 1161 through this flow channel.

[0136] In some embodiments, in order to shorten the flow path of the atomizing cooling medium, the through hole 152 is disposed opposite to the first air gap 1161.

[0137] By adopting the above technical solution, the heat generated by the rotor 13 during operation can not only be directly absorbed by the atomizing cooling medium in the first air gap 1161, but also be transferred to the rotating shaft 15 and absorbed by the atomizing cooling medium in the conveying channel 151, further improving the cooling effect of the rotor 13, and thus further improving the working performance of the motor 10.

[0138] In some embodiments of the present application, please refer to Figure 8 , the number of the through holes 152 is multiple, and the multiple through holes 152 surround the central axis of the motor 10.

[0139] The number of the through holes 152 can be determined according to actual application requirements, and specifically can be 4, 6, 8, 10, etc.

[0140] The arrangement that a plurality of through holes 152 are disposed around the central axis of the motor 10 means that the plurality of through holes 152 are circumferentially distributed along the motor 10. In some embodiments, the plurality of through holes 152 are evenly distributed along the circumference of the motor 10, that is, in the circumferential direction of the motor 10, the distances between adjacent two through holes 152 are equal.

[0141] By adopting the above technical solution, the atomized cooling medium can be provided to the first air gap 1161 more uniformly, further improving the cooling effect of the rotor 13, and thus further improving the working performance of the motor 10.

[0142] In some embodiments of the present application, please refer to Figure 5 and Figure 8 , the first housing 11 is provided with a first outlet 118 communicating with the rotor cavity 115 and a diversion groove 117 is provided on the inner peripheral wall of the rotor cavity 115, and the diversion groove 117 is communicated with the first outlet 118.

[0143] The diversion groove 117 is used to guide the atomized cooling medium in the rotor cavity 115 to the first outlet 118, so that the atomized cooling medium is discharged to the outside of the rotor cavity 115 via the first outlet 118.

[0144] In some embodiments, the diversion groove 117 extends along the circumferential direction of the rotor 13, and both opposite ends of the diversion groove 117 are communicated with the first outlet 118. As an example, the number of the diversion grooves 117 is multiple, and the multiple diversion grooves 117 are arranged at intervals along the axial direction of the motor 10.

[0145] During the operation of the motor 10, the atomized cooling medium adhered to the rotor 13 will be thrown into the diversion groove 117 under the action of centrifugal force, then flow along the diversion groove 117 to the first outlet 118, and finally be discharged to the outside of the rotor cavity 115 via the first outlet 118.

[0146] By adopting the above technical solution, the accumulation of the atomized cooling medium in the rotor cavity 115 is effectively improved, and the oil stirring loss of the rotor 13 is further reduced, thereby further improving the working performance of the motor 10.

[0147] In some embodiments of the present application, please refer to Figure 5 and Figure 8 , the first outlet 118 is opened on the bottom of the first housing 11.

[0148] The first housing 11 can be divided into a bottom and a top with the central axis of the motor 10 as the boundary. Among them, the bottom of the first housing 11 refers to the part of the first housing 11 closest to the ground plane, and the top of the first housing 11 refers to the part of the first housing 11 farthest from the ground plane.

[0149] By adopting the above technical solution, the atomized cooling medium in the rotor cavity 115 can flow more quickly along the diversion groove 117 to the first outlet 118 under the action of gravity, effectively improving the discharge efficiency of the atomized cooling medium, further improving the accumulation situation of the atomized cooling medium in the rotor cavity 115, further reducing the oil stirring loss of the rotor 13, and thus further enhancing the working performance of the motor 10.

[0150] In a second aspect, please refer to Figure 3 , an electric drive device 1 provided by an embodiment of the present application includes the motor 10 described in any one of the above embodiments.

[0151] Since the electric drive device 1 provided by the embodiment of the present application adopts the motor 10 described in any one of the above embodiments, the working performance of the electric drive device 1 is effectively improved.

[0152] In a third aspect, please refer to Figure 1 , an electric drive system provided by an embodiment of the present application includes a battery 2 and the above electric drive device 1, and the battery 2 is electrically connected to the motor 10.

[0153] Since the electric drive system provided by the embodiment of the present application adopts the above electric drive device 1, the working performance of the electric drive system is effectively improved.

[0154] In a fourth aspect, please refer to Figure 1 , an electric device provided by an embodiment of the present application includes the above electric drive device 1 or the above electric drive system.

[0155] Since the electric device provided by the embodiment of the present application adopts the above electric drive device 1 or the above electric drive system, the working performance of the electric device is effectively improved.

[0156] The above are only the preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A motor, characterized in that: The motor comprises: A first housing having a stator cavity and a rotor cavity separated from each other; A stator, accommodated in the stator cavity; The rotor is accommodated in the rotor cavity. A first air gap is formed between the rotor and the stator. The first air gap is located in the rotor cavity and is used for circulating an atomized cooling medium.

2. The motor according to claim 1, characterized in that The stator cavity is used to contain cooling liquid, and at least a part of the stator is immersed in the cooling liquid.

3. The motor according to claim 2, characterized in that The motor further comprises an atomizing element, and the atomizing element is used for atomizing the coolant to form the atomized cooling medium.

4. The motor according to claim 3, characterized in that The first housing includes a first shell and a partition, the partition is arranged in the first shell to separate the internal space of the first shell into the stator cavity and the rotor cavity, and the atomizer is installed on the partition.

5. The motor according to claim 4, characterized in that The partition is provided with a mounting hole, the mounting hole is connected with the stator cavity and the rotor cavity, the atomizer comprises an atomizer body, and the atomizer body is mounted in the mounting hole.

6. The motor according to claim 5, characterized in that The atomizer also includes a wire harness electrically connected to the atomizer body, and the partition is also provided with a wire outlet hole connected to the mounting hole, and the wire harness is passed through the wire outlet hole.

7. The motor according to claim 6, characterized in that The motor further comprises a rotating shaft coaxially connected to the rotor, the first housing comprises an axial cavity for accommodating the rotating shaft, and the wire outlet hole communicates with the mounting hole and the axial cavity.

8. The motor according to claim 5, characterized in that The atomizing body is sealed and connected to the hole wall of the mounting hole.

9. The motor according to claim 8, characterized in that The motor further comprises a sealing member, which is arranged between the atomizing body and the hole wall of the mounting hole to seal and connect the atomizing body and the hole wall of the mounting hole.

10. The motor according to claim 3, characterized in that There are multiple atomizing components, and the multiple atomizing components are arranged around the central axis of the motor.

11. The motor according to claim 1, characterized in that The motor also includes a rotating shaft coaxially connected to the rotor, a conveying channel is formed inside the rotating shaft, a through hole is opened on the shaft wall of the rotating shaft, the through hole connects the first air gap and the conveying channel, and the conveying channel is used to connect an atomization device to convey the atomized cooling medium to the first air gap.

12. The motor according to claim 11, characterized in that There are multiple through holes, and the multiple through holes are arranged around the central axis of the motor.

13. The electric machine according to any one of claims 1 to 12, characterized in that The first shell is provided with a first outlet connected to the rotor cavity, and a guide groove is provided on the inner peripheral wall of the rotor cavity, wherein the guide groove is connected to the first outlet.

14. The motor according to claim 13, characterized in that The first outlet is opened on the bottom of the first housing.

15. The electric machine according to any one of claims 1 to 12, characterized in that The number of the stators is two, and the two stators are arranged on opposite sides of the rotor along the axial direction.

16. An electric drive device, characterized in that: The electric drive device comprises the electric motor according to any one of claims 1-15.

17. An electric drive system, characterized in that: The electric drive system comprises a battery and the electric drive device as claimed in claim 16, wherein the battery is electrically connected to the motor.

18. An electric device, characterized in that: The electric device comprises the electric drive apparatus according to claim 16 or the electric drive system according to claim 17 .

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