Electric machine and thermal management system

Abstract

The invention provides a motor and a thermal management system, and particularly relates to the technical field of motors. The motor comprises a shell, a pipeline assembly and a rotor shaft. Wherein an oil inlet hole and an oil outlet hole are formed in the shell, and cooling oil can flow through the oil inlet hole and the oil outlet hole. The pipeline assembly is communicated with the oil inlet hole and the oil outlet hole. The rotor shaft is rotatably installed on the shell, at least one oil passing groove is formed in the circumferential direction of the rotor shaft, the oil passing groove is communicated with the oil inlet hole and the oil outlet hole through a pipeline assembly, and the rotor shaft drives cooling oil in the oil passing groove to flow in the rotating process. Therefore, the motor provided by the invention enables the cooling oil to be pumped through the rotation of the rotor shaft, can reduce or cancel the dependence on an external pump body, and further reduces the weight of a whole thermal management system. And a heat dissipation function can be provided for the stator and the rotor of the motor, and the heat dissipation efficiency of the motor is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric machines, in particular to an electric machine and a thermal management system. BACKGROUND

[0002] At present, with the continuous development of low-altitude economy, the market expansion and technology iteration of new energy aircraft are accelerating. Correspondingly, the electric drive system on the aircraft is also rapidly iterating towards high power density, lightweight, and high reliability.

[0003] Among them, for the electric machine of the traditional structure, the heat dissipation of the electric machine is usually by passive heat dissipation of the body, forced air cooling, shell liquid cooling, immersion oil cooling and the like. In addition to passive heat dissipation relying on the structure of the electric machine body, an external thermal management system is needed to provide and drive the cooling medium to exchange heat with the stator winding, rotor magnetic steel and the like.

[0004] However, in the process of developing the electric drive system towards high power density, the problem of insufficient heat dissipation power or insufficient heat dissipation power redundancy may be caused under the lightweight of the heat dissipation system, or the problem of complex system structure and excessive mechanical weight when the heat dissipation is sufficient, so that the realization of the electric drive system in lightweight, high reliability and other indicators still needs to be improved. SUMMARY

[0005] The present application provides an electric machine and a thermal management system. The cooling oil is pumped by the rotation of the rotor shaft, which can reduce or cancel the dependence on the external pump body, thereby reducing the weight of the entire thermal management system. It can also provide heat dissipation function for the stator and rotor of the electric machine, and improve the heat dissipation efficiency of the electric machine.

[0006] The first aspect of the embodiment of the present application provides an electric machine, comprising:

[0007] A housing, the housing is provided with an oil inlet hole and an oil outlet hole, and the oil inlet hole and the oil outlet hole are both for the circulation of cooling oil;

[0008] A pipeline assembly, the pipeline assembly is connected to the oil inlet hole and the oil outlet hole;

[0009] A rotor shaft, the rotor shaft is rotatably installed in the housing, and the rotor shaft is provided with at least one oil passage in the circumferential direction, the oil passage is connected to the oil inlet hole and the oil outlet hole through the pipeline assembly, and the cooling oil in the oil passage is driven to flow by the rotation of the rotor shaft.

[0010] The motor provided in the first aspect of the embodiment of the present application comprises a shell, a pipeline assembly and a rotor shaft. The shell is provided with an oil inlet hole and an oil outlet hole, and the oil inlet hole and the oil outlet hole are both available for the circulation of cooling oil. The pipeline assembly is connected to the oil inlet hole and the oil outlet hole. The rotor shaft is rotatably installed on the shell, and the rotor shaft is provided with at least one oil channel in the circumferential direction. The oil channel is connected to the oil inlet hole and the oil outlet hole through the pipeline assembly, and the rotor shaft drives the cooling oil in the oil channel to flow during rotation. In this way, the motor provided in the embodiment of the present application enables the cooling oil to be pumped by the rotation of the rotor shaft, which can reduce or eliminate the dependence on an external pump body, thereby reducing the weight of the entire thermal management system. The motor can also provide heat dissipation for the stator and the rotor, thereby improving the heat dissipation efficiency of the motor.

[0011] In a possible implementation, the oil channels are arranged in parallel along the first direction on the outer periphery of the rotor shaft.

[0012] In a possible implementation, the shell has a shell shaft in the first direction, and the shell shaft is arranged in correspondence with the inner periphery of the rotor shaft.

[0013] The shell shaft is provided with an oil outlet and an oil return in the axial direction, the oil outlet is connected to the oil inlet hole, and the oil return is connected to the oil outlet hole.

[0014] In a possible implementation, the pipeline assembly comprises a rotor pipeline.

[0015] The rotor pipeline comprises a rotor oil inlet ring, a rotor oil inlet pipe, a rotor oil return pipe and a rotor oil return ring. The rotor oil inlet ring is connected to the oil outlet, and the rotor oil return ring is connected to the oil return.

[0016] One end of the rotor oil inlet pipe is connected to the rotor oil inlet ring, and the other end of the rotor oil inlet pipe is connected to the oil channel on the outer periphery of the rotor shaft.

[0017] One end of the rotor oil return pipe is connected to the rotor oil return ring, and the other end of the rotor oil return pipe is connected to the oil channel on the outer periphery of the rotor shaft.

[0018] In a possible implementation, the rotor oil inlet ring and the rotor oil return ring are arranged in parallel along the first direction on the inner periphery of the rotor shaft.

[0019] The rotor oil inlet pipe and the rotor oil return pipe are arranged in parallel along the first direction.

[0020] In a possible implementation, the pipeline assembly further comprises a stator pipeline.

[0021] The stator pipeline comprises a fixed joint and a fixed pipeline. One end of the fixed joint is installed on the oil outlet, and the other end of the fixed joint is connected to the fixed pipeline.

[0022] The casing has a cooling end and an oil outlet end in its circumference. A fixed pipeline is connected to the cooling end, and the cooling end and the oil outlet end are connected.

[0023] In one possible implementation, it further includes: a sealing component;

[0024] The sealing assembly seals the contact surface between the housing shaft and the rotor shaft.

[0025] In one possible implementation, it further includes: a stator assembly mounted on the inner sidewall of the housing;

[0026] The stator assembly includes a stator and a stator retaining ring, which is located on one side of the stator in a first direction to axially limit the stator.

[0027] In one possible implementation, it further includes: a rotor assembly, which is sleeved on the rotor shaft and located on the inner circumferential side of the stator assembly;

[0028] The rotor assembly includes a magnet assembly and a mounting ring. The magnet assembly is connected to the mounting ring, and the mounting ring and the oil passage groove on the outer periphery of the rotor shaft are engaged.

[0029] A second aspect of this application provides a thermal management system, including a pump body, a filter, a heat exchanger, an oil tank, a detection component, and the aforementioned motor;

[0030] The oil outlet of the motor is connected to the heat exchanger through at least part of the detection components and the filter, and the output of the heat exchanger has a first branch and a second branch.

[0031] The heat exchanger is connected to at least part of the detection components and the oil inlet of the motor via a valve body, forming the first branch;

[0032] The heat exchanger is connected in sequence to the oil tank, filter and pump body, and is connected to the oil inlet of the motor through at least part of the detection components, forming a second branch.

[0033] It should be understood that the second aspect of this application corresponds to the technical solution of the first aspect of this application, and the beneficial effects achieved by each aspect and the corresponding feasible implementation are similar, and will not be repeated here.

[0034] In addition to the technical problems solved by this application, the technical features constituting the technical solutions, and the beneficial effects brought about by the technical features of these technical solutions as described above, other technical problems that can be solved by the motor and thermal management system provided by this application, other technical features included in the technical solutions, and the beneficial effects brought about by these technical features will be further explained in detail in the specific embodiments. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments of this application or the prior art will be briefly introduced below. Obviously, the drawings described below are only a part of the embodiments of this application. These drawings and text descriptions are not intended to limit the scope of the concept of this application in any way, but to illustrate the concept of this application to those skilled in the art by referring to specific embodiments. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 An exploded view of the motor provided in an embodiment of this application;

[0037] Figure 2 An exploded front view of the motor provided in an embodiment of this application;

[0038] Figure 3 A cross-sectional view of the motor provided in an embodiment of this application;

[0039] Figure 4 This is a schematic diagram of the structure of the motor housing provided in an embodiment of this application;

[0040] Figure 5 This is a schematic diagram of the rotor shaft of the motor provided in an embodiment of this application;

[0041] Figure 6 A cross-sectional view of the rotor shaft of the motor provided in an embodiment of this application;

[0042] Figure 7 A partial sectional view of the rotor shaft of the motor provided in an embodiment of this application;

[0043] Figure 8 This is a schematic diagram of the structure of the thermal management system provided in an embodiment of this application.

[0044] Explanation of reference numerals in the attached figures:

[0045] 100 - Motor;

[0046] 200 - Housing; 210 - Receiving cavity; 220 - Oil inlet; 230 - Oil outlet; 240 - Housing shaft; 241 - Oil outlet; 242 - Oil return port; 250 - Cooling end; 260 - Oil outlet end;

[0047] 300 - Piping assembly; 310 - Rotor piping; 311 - Rotor oil inlet ring; 312 - Rotor oil inlet pipe; 313 - Rotor oil return pipe; 314 - Rotor oil return ring; 320 - Stator piping; 321 - Fixed joint; 322 - Fixed piping; 330 - Oil inlet joint; 340 - Oil outlet joint;

[0048] 400 - Rotor shaft; 410 - Oil passage groove; 420 - Hollow cavity;

[0049] 500 - Sealing assembly;

[0050] 600 - Stator assembly; 610 - Stator; 620 - Stator retaining ring;

[0051] 700 - Rotor assembly; 710 - Magnet assembly; 720 - Mounting ring;

[0052] 800 - End cap; 810 - Output shaft; 820 - Output shaft retaining ring; 830 - Output end dust cover; 840 - Angular contact ball bearing; 850 - Oil separator sleeve;

[0053] 900-Thermal management system; 910-Pump body; 920-Filter; 921-First filter; 922-Second filter; 930-Heat exchanger; 940-Oil tank; 950-Detection component; 951-Temperature sensor; 9511-First temperature sensor; 9512-Second temperature sensor; 952-Flow meter; 960-Valve body. Detailed Implementation

[0054] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0055] As described in the background section, as electric drive systems develop towards higher power density, it may lead to problems such as insufficient heat dissipation power or insufficient heat dissipation power redundancy under the weight reduction of the heat dissipation system, or the system structure is relatively complex and the mechanical weight is too large when the heat dissipation is sufficient. Therefore, electric drive systems still need to be improved in terms of achieving indicators such as weight reduction and high reliability.

[0056] To address the aforementioned technical problems, the first aspect of this application provides an electric motor. The motor includes a housing, a piping assembly, and a rotor shaft. The housing has an oil inlet and an oil outlet, both of which allow cooling oil to flow through. The piping assembly connects the oil inlet and the oil outlet. The rotor shaft is rotatably mounted on the housing, and at least one oil passage is provided circumferentially on the rotor shaft. The oil passage is connected to the oil inlet and the oil outlet via the piping assembly, and the rotor shaft drives the cooling oil in the oil passage to flow during rotation. Thus, the motor provided by this application allows the cooling oil to be pumped through the rotation of the rotor shaft, reducing or eliminating reliance on an external pump and thereby reducing the weight of the entire thermal management system. It also provides heat dissipation for the stator and rotor of the motor, improving the motor's heat dissipation efficiency.

[0057] A second aspect of this application provides a thermal management system. The thermal management system includes a pump body, a filter, an oil tank, a detection component, and the aforementioned motor. The oil outlet of the motor is connected to a heat exchanger via at least a portion of the detection component and the filter. The output of the heat exchanger has a first branch and a second branch. The heat exchanger is connected to at least a portion of the detection component and the motor's oil inlet via a valve body, forming the first branch. The heat exchanger is sequentially connected to the oil tank, the filter, and the pump body, and is also connected to the motor's oil inlet via at least a portion of the detection component, forming the second branch.

[0058] To make the above-mentioned objectives, features, and advantages of the embodiments of this application more apparent and understandable, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0059] This application provides an electric motor and a thermal management system. Cooling oil is pumped via the rotation of the rotor shaft, reducing or eliminating reliance on an external pump and thus reducing the overall weight of the thermal management system. It also provides heat dissipation for the motor's stator and rotor, improving the motor's heat dissipation efficiency. The specific structure of the electric motor and thermal management system provided in this application will be described below with reference to the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0060] refer to Figure 1 , Figure 2 as well as Figure 3 This application provides a motor 100 in a first aspect. The motor 100 may include a housing 200, a piping assembly 300, and a rotor shaft 400. In one possible implementation, such as... Figure 1 As shown, both the housing 200 and the rotor shaft 400 can be cylindrical structures, and this embodiment of the application is not limited thereto. In this embodiment of the application, the housing 200 may have a receiving cavity 210, and the rotor shaft 400 and at least a portion of the piping assembly 300 may be installed in the receiving cavity 210.

[0061] refer to Figure 4Based on the above embodiments, the housing 200 may be provided with an oil inlet 220 and an oil outlet 230. Both the oil inlet 220 and the oil outlet 230 allow cooling oil to flow through, allowing the cooling oil to flow into the housing 200 from the oil inlet 220 and then out from the oil outlet 230. It is understood that the piping assembly 300 may be connected to both the oil inlet 220 and the oil outlet 230, allowing the cooling oil to flow along the piping assembly 300, facilitating heat dissipation for the various components within the motor 100.

[0062] Furthermore, the rotor shaft 400 is rotatably mounted in the receiving cavity 210 of the housing 200. Wherein, as Figure 5 As shown, the rotor shaft 400 may be provided with an oil passage groove 410 in its circumferential direction. In one possible embodiment, the number of oil passage grooves 410 may be at least one, and this embodiment is not limited thereto. In this embodiment, the oil passage groove 410 may be connected to the piping assembly 300, thereby allowing the oil passage groove 410 to be connected to the oil inlet 220 and the oil outlet 230 through the piping assembly 300. This drives the flow of cooling oil in the oil passage groove 410.

[0063] In one possible implementation, the oil passage 410 can be a spiral structure, and the number of oil passages 410 can be several. This application embodiment does not limit the number of such passages.

[0064] Understandably, during the operation of the motor 100, the oil passage 410 on the rotor shaft 400 generates pumping capacity during rotation, driving the coolant oil to flow. This reduces or eliminates reliance on the external pump body 910, thereby reducing the weight of the entire thermal management system 900. Furthermore, the flow of coolant oil in the piping assembly 300 provides heat dissipation for the stator 610 and rotor of the motor 100, thus improving the heat dissipation efficiency of the motor 100.

[0065] It should be noted that the first direction can be the thickness direction of the shell 200, such as... Figure 3 The x-direction in the middle.

[0066] Continue to refer to Figure 5 Based on the above embodiments, in one possible implementation, a plurality of oil passage grooves 410 may be arranged side by side along the first direction on the outer periphery of the rotor shaft 400. In this way, the outer periphery of the rotor shaft 400 is provided with oil passage grooves 410, which facilitates connection with the pipeline assembly 300.

[0067] Continue to refer to Figure 1 as well as Figure 2Based on the above embodiments, the housing 200 may have a housing shaft 240 in the first direction, and the housing shaft 240 may protrude from the receiving cavity 210 of the housing 200. Wherein, combined with Figure 5 As can be seen, a hollow cavity 420 can be opened at the center position of the rotor shaft 400, and the shell shaft 240 can be set correspondingly at the center position of the rotor shaft 400, so that the shell shaft 240 can be inserted into the hollow cavity 420 of the rotor shaft 400, which facilitates the connection between the rotor shaft 400 and the shell 200.

[0068] Continue to refer to Figure 4 Based on the above embodiment, the housing shaft 240 can be provided with an oil outlet 241 and an oil return port 242 in the axial direction. The oil outlet 241 of the housing shaft 240 is connected to the oil inlet 220 of the housing 200, and correspondingly, the oil return port 242 of the housing shaft 240 is connected to the oil outlet 230 of the housing 200. It is understood that cooling oil can enter the oil outlet 241 of the housing shaft 240 along the oil inlet 220 of the housing 200, and after flowing for a period of time, it can flow out of the oil outlet 230 of the housing 200 along the oil return port 242 of the housing shaft 240.

[0069] Continue to refer to Figure 3 Based on the above embodiments, the piping assembly 300 may include a rotor piping 310. In the embodiments of this application, such as... Figure 6 As shown, the rotor pipeline 310 may further include a rotor oil inlet ring 311, a rotor oil inlet pipe 312, a rotor oil return pipe 313, and a rotor oil return ring 314. The rotor oil inlet ring 311 may be connected to the oil outlet 241, while the rotor oil return ring 314 may be connected to the oil return port 242.

[0070] Additionally, one end of the rotor oil inlet pipe 312 can be connected to the rotor oil inlet ring 311, while the other end of the rotor oil inlet pipe 312 can be connected to the oil passage groove 410 on the outer periphery of the rotor shaft 400. Correspondingly, one end of the rotor oil return pipe 313 can be connected to the rotor oil return ring 314, and the other end of the rotor oil return pipe 313 can also be connected to the oil passage groove 410 on the outer periphery of the rotor shaft 400.

[0071] In this way, the cooling oil can enter the oil outlet 241 of the housing shaft 240 through the oil inlet hole 220 of the housing 200, and then enter the rotor oil inlet pipe 312 through the rotor oil inlet ring 311 and flow along the oil passage 410 on the outer periphery of the rotor shaft 400. After the cooling oil flows for a period of time, it can flow through the rotor return pipe 313 and flow out of the oil outlet hole 230 of the housing 200 through the rotor return ring 314 along the return port 242 of the housing shaft 240.

[0072] refer to Figure 6as well as Figure 7 Based on the above embodiments, the rotor oil inlet ring 311 and the rotor oil return ring 314 can be arranged side by side along the first direction on the inner circumference of the rotor shaft 400. The rotor oil inlet ring 311 and the rotor oil return ring 314 can be located between the cavity walls of the housing shaft 240 and the hollow cavity 420 of the rotor shaft 400, so that the rotor oil inlet ring 311 and the rotor oil return ring 314 can be sleeved on the housing shaft 240 and engaged on the oil passage groove 410 on the inner circumference of the rotor shaft 400.

[0073] In one possible implementation, both the rotor oil inlet ring 311 and the rotor oil return ring 314 can be hollow annular structures. In this embodiment, the rotor oil inlet ring 311 has an opening along its entire circumference at the end facing the oil outlet 241, ensuring that the oil outlet 241 always faces the opening as the rotor oil inlet ring 311 rotates with the rotor shaft 400. This ensures that the cooling oil flowing from the oil outlet 241 always enters the rotor oil inlet pipe 312 along the rotor oil inlet ring 311, preventing cooling oil loss.

[0074] Correspondingly, the rotor oil return ring 314 may also have an opening along its entire circumference at the end facing the oil return port 242, so that the oil return port 242 always faces the opening as the rotor oil return ring 314 rotates with the rotor shaft 400. This ensures that the cooling oil flowing out of the rotor oil return ring 314 can always flow back to the oil return port 242, and also prevents the loss of cooling oil.

[0075] Continue to refer to Figure 6 as well as Figure 7 Based on the above embodiments, the rotor oil inlet pipe 312 and the rotor oil return pipe 313 can also be arranged side by side along the first direction. In one possible implementation, both the rotor oil inlet pipe 312 and the rotor oil return pipe 313 can be located in the radial direction of the rotor shaft 400, which facilitates efficient heat dissipation of the rotor assembly 700 during the flow of cooling oil.

[0076] Continue to refer to Figure 3 Based on the above embodiments, the piping assembly 300 may further include a stator piping 320. In this embodiment, the stator piping 320 may further include a fixed connector 321 and a fixed pipe 322. In one possible implementation, the fixed connector 321 and the fixed pipe 322 may be located at one end of the housing 200 opposite to the rotor shaft 400. One end of the fixed connector 321 may be installed in the oil outlet 230, and the other end of the fixed connector 321 may be connected to the fixed pipe 322. Thus, after the cooling oil flows out of the oil outlet 230 of the housing 200, it can enter the fixed pipe 322 along the fixed connector 321.

[0077] In one possible implementation, the fixed joint 321 can be a hinged joint, and the fixed pipe 322 can be a hinged pipe, so that the fixed joint 321 and the fixed pipe 322 are fixedly connected by a hinge. This application embodiment is not limited in this respect.

[0078] Continue to refer to Figure 4 Based on the above embodiments, the housing 200 may be provided with a cooling end 250 and an oil outlet end 260 in the circumferential direction. The cooling end 250 may be disposed along the outer periphery of the housing 200, while the oil outlet end 260 may be disposed on the housing 200 along a first direction. In the embodiments of this application, combined with... Figure 3 As can be seen, the fixed pipe 322 can be connected to the cooling end 250 through the fixed connector 321, and the cooling end 250 can be connected to the oil outlet 260.

[0079] It is understandable that after the cooling oil flows into the fixed pipe 322, it can then enter the cooling end 250 to dissipate heat and cool the stator 610. After heat exchange, the cooling oil can flow out along the oil outlet 260.

[0080] In one possible implementation, such as Figure 1 as well as Figure 2 As shown, the piping assembly 300 may further include an oil inlet connector 330 and an oil outlet connector 340. In this embodiment, the oil inlet connector 330 may be installed at the oil inlet port 220, while the oil outlet connector 340 may be installed at the oil outlet end 260, thereby facilitating connection with the piping in the external thermal management system 900.

[0081] Continue to refer to Figure 6 as well as Figure 7 Based on the above embodiments, the motor 100 may further include a sealing assembly 500. The sealing assembly 500 can seal the abutment surface between the housing shaft 240 and the rotor shaft 400.

[0082] Continue to refer to Figure 6 Based on the above embodiments, in one possible implementation, the number of sealing components 500 can be several, and this application embodiment does not limit this. In this application embodiment, exemplarily, the housing shaft 240 may be provided with three sealing grooves in the circumferential direction, and the three sealing grooves are arranged side-by-side along the first direction. The three sealing grooves may be sequentially spaced between the rotor oil inlet ring 311 and the rotor oil return ring 314. It is understood that the sealing component 500 can be used to prevent oil overflow or leakage during the rotation of the rotor shaft 400 and the pumping of cooling oil, or leakage between the rotor oil inlet ring 311 and the rotor oil return ring 314, to achieve good sealing performance.

[0083] Continue to refer to Figure 3 Based on the above embodiments, the motor 100 may further include a stator assembly 600. The stator assembly 600 can be installed in the receiving cavity 210 of the housing 200, and the stator assembly 600 can be fixedly connected to the inner sidewall of the housing 200. Further, the stator assembly 600 may include a stator 610 and a stator retaining ring 620. The stator retaining ring 620 can be located on one side of the stator 610 in the first direction, thereby enabling the stator retaining ring 620 to axially limit the stator 610. It is understood that the housing 200 and the stator retaining ring 620 can respectively axially limit the stator 610 on both sides in the first direction, thereby preventing axial movement of the stator 610.

[0084] Continue to refer to Figure 3 Based on the above embodiments, the motor 100 may further include a rotor assembly 700. The rotor assembly 700 may be sleeved on the rotor shaft 400, and the rotor assembly 700 is located on the inner circumferential side of the stator assembly 600, with a certain gap between them, thereby preventing the rotor assembly 700 from affecting the stator assembly 600 during rotation.

[0085] Furthermore, the rotor assembly 700 may include a magnet assembly 710 and a mounting ring 720. The magnet assembly 710 may be connected to the mounting ring 720. In one possible embodiment, the magnet assembly 710 may be mounted on the mounting ring 720. The mounting ring 720 may be sleeved on the rotor shaft 400, and the mounting ring 720 may cooperate with the oil passage groove 410 on the outer periphery of the rotor shaft 400, thereby allowing cooling oil to flow between the inner wall of the mounting ring 720 and the cavity formed by the oil passage groove 410 on the outer periphery of the rotor shaft 400.

[0086] Continue to refer to Figure 1 as well as Figure 2Based on the above embodiments, the motor 100 may further include: an end cover 800, an output shaft 810, an output shaft retaining ring 820, an output end dust cover 830, and an angular contact ball bearing 840. The end cover 800 may be located at one end of the stator assembly 600 facing away from the housing 200. The output shaft 810 may be connected to the rotor assembly 700 and extend from the interior of the motor 100 to the exterior. The output shaft 810 may be used to transmit the rotational motion and torque of the motor 100 to external equipment or loads. One end of the output shaft retaining ring 820 may be fixed to the output shaft 810, and the other end may be fixed to the rotor shaft 400, thereby preventing axial movement of the output shaft 810 and the rotor shaft 400 and ensuring that the output shaft 810 and the rotor shaft 400 remain in the correct position during operation. The output end dust cover 830 may be installed at the output end of the motor 100, covering the output shaft 810 and related components. The output dust cover 830 can be used to prevent dust, dirt and other external contaminants from entering the motor 100. The angular contact ball bearing 840 can also be installed at the output end of the motor 100 to support the output shaft 810 and allow the output shaft 810 to rotate smoothly.

[0087] Continue to refer to Figure 3 Based on the above embodiments, the motor 100 may further include an oil separator 850. The oil separator 850 may be located between the magnet assembly 710 and the stator 610 to prevent leakage of cooling oil. It is understood that the stator assembly 600 can achieve sealing and unidirectional flow of cooling oil through the sealed cavity formed by the end cover 800, the housing 200, and the oil separator 850.

[0088] In this embodiment, when the motor 100 is working, the stator assembly 600 is energized, thereby driving the rotor assembly 700 to rotate, which in turn drives the rotor shaft 400 to rotate. The rotor shaft 400 is axially fixed by the output shaft fixing ring 820, and transmits torque and speed to the output shaft 810. During the operation of the motor 100, the pumping capacity generated by the oil passage groove 410 on the rotor shaft 400 during rotation can draw cooling oil from the oil inlet joint 330, or the cooling oil can be pumped into the oil inlet joint 330 through the thermal management system 900. The cooling oil passes through the oil inlet hole 220 of the housing 200 and the oil outlet 241 of the housing shaft 240 in sequence, and then enters the rotor oil inlet ring 311, the rotor oil inlet pipe 312, and the oil passage groove 410 on the outer periphery of the rotor shaft 400. Understandably, after flowing through the oil channel 410, the cooling oil can provide cooling for the mounting ring 720 and magnet assembly 710 in the rotor assembly 700. It then enters the rotor return oil pipe 313 and rotor return oil ring 314, then enters the return oil port 242 of the housing shaft 240 and reaches the oil outlet 230 of the housing 200 before being pumped out. After passing through the fixed pipe 322 connected by the fixed connector 321, it continues to flow into the cooling end 250 to provide cooling for the stator assembly 600. Finally, it flows out through the oil outlet 260 and returns to the external thermal management system 900.

[0089] refer to Figure 8 This application provides a thermal management system 900 in a second aspect. The thermal management system 900 may include a pump body 910, a filter 920, a heat exchanger 930, an oil tank 940, a detection component 950, and the aforementioned motor 100. In one possible implementation, the oil outlet 260 of the motor 100 is connected to the heat exchanger 930 through at least a portion of the detection component 950 and the filter 920. The output end of the heat exchanger 930 has a first branch and a second branch. In this application embodiment, the heat exchanger 930 is connected to at least a portion of the detection component 950 and the oil inlet 220 of the motor 100 through a valve body 960, forming the first branch. Additionally, the heat exchanger 930 is sequentially connected to the oil tank 940, the filter 920, and the pump body 910, and is connected to the oil inlet 220 of the motor 100 through at least a portion of the detection component 950, forming the second branch.

[0090] Referring again to 8, based on the above embodiments, the detection component 950 may include a temperature sensor 951 and a flow meter 952. In one possible implementation, the number of temperature sensors 951 may be two, and the number of filters 920 may also be two; this application embodiment does not impose limitations. In this application embodiment, taking an example where the temperature sensor 951 includes a first temperature sensor 9511 and a second temperature sensor 9512, and the filters 920 include a first filter 921 and a second filter 922, the cooling oil flows out from the oil outlet 260 of the motor 100, passes through the temperature sensor 9511 for temperature acquisition, and is filtered by the first filter 921 before reaching the heat exchanger 930. In the first branch of the heat exchanger 930, the heat exchanger 930 is connected to the flow meter 952 and the second temperature sensor 9512 via a valve body 960, and finally returns to the oil inlet 220 of the motor 100. In the second branch of heat exchanger 930, heat exchanger 930 is sequentially connected to oil tank 940, second filter 922 and pump body 910, and then returns to oil inlet 220 of motor 100 via flow meter 952 and second temperature sensor 9512. In one possible implementation, valve body 960 can be a bypass valve, which is not limited in this embodiment.

[0091] Understandably, when the thermal management system 900 is running, the first temperature sensor 9511 can collect real-time temperature data of the cooling oil at the oil outlet 260 of the motor 100, and the second temperature sensor 9512 can collect real-time temperature data of the cooling oil at the oil inlet 220 of the motor 100. The temperature difference is calculated, and combined with the reading of the flow meter 952, the heat generated by the motor 100 is calculated. It is then determined whether the current flow rate of the cooling oil meets the heat dissipation requirements of the motor 100, thereby determining whether the pump body 910 should be started to provide additional flow to the motor 100.

[0092] In this embodiment, the motor 100 provided can be applied to the field of aircraft. During takeoff, when the motor 100 operates at maximum speed to drive the propeller and provide thrust, it can pump oil. At this time, the valve body 960 can be in a one-way position, allowing the cooling oil to flow to the second branch of the heat exchanger 930. The motor 100 and pump body 910 can simultaneously introduce cooling oil from the inlet connector 330 and discharge it from the outlet connector 340. After being filtered by the first filter 921, the cooling oil enters the heat exchanger 930, where it is cooled by the onboard water cooling system through heat exchange. After passing through the heat exchanger 930, the cooling oil flows into the oil tank 940, is filtered by the second filter 922, and is then pumped back into the inlet connector 330 by the pump body 910 and the motor 100 itself to complete the cooling cycle. During this cycle, the oil already in tank 940 can also provide additional cooling capacity due to its lower temperature.

[0093] During the flight phase, when motor 100 operates at rated power and pumps oil using its own pump, valve 960 can be in the normally open position, allowing cooling oil to flow to the first branch of heat exchanger 930. Motor 100 draws cooling oil in through inlet connector 330 and discharges it through outlet connector 340. After being filtered by first filter 921, the cooling oil enters heat exchanger 930, where it is cooled by the onboard water cooling system through heat exchange. After passing through heat exchanger 930, the cooling oil passes through valve 960 and re-enters inlet connector 330 to complete the cooling cycle. If the thermal management system 900 determines that changes in motor 100's power supply during flight phase cause variations in motor 100's heat output and require additional cooling capacity, pump 910 can be activated at any time, and valve 960 can be switched at any time to provide additional cooling oil flow to motor 100, operating in the manner required during takeoff.

[0094] After the aircraft lands, to prevent the high temperature buildup inside the motor 100 from affecting its lifespan or ground maintenance, the valve body 960 can be placed in a one-way position, allowing the cooling oil to flow to the second branch of the heat exchanger 930. Specifically, the pump body 910 starts, introducing the cooling oil through the inlet connector 330 and discharging it through the outlet connector 340. After being filtered by the first filter 921, the cooling oil enters the heat exchanger 930 for cooling and then flows into the oil tank 940. Finally, the pump body 910 draws the oil back into the inlet connector 330, completing the cooling cycle.

[0095] It is understandable that, through the heat dissipation circulation of the self-pumped cooling oil in the rotor shaft 400 of the motor 100, even after the pump body 910 in the thermal management system 900 fails, the motor 100 provided in this application embodiment still has the heat dissipation circulation capability to ensure the operation of the motor 100, thereby enabling the aircraft to more easily find landing conditions and landing sites, avoiding the situation where the remaining alternate landing time is too short due to relying solely on the heat capacity of the motor 100 itself.

[0096] In this embodiment, the motor 100 provided in this application enables the cooling oil to be pumped through the rotation of the rotor shaft 400, which can reduce or eliminate the dependence on the external pump body 910, thereby reducing the weight of the entire thermal management system 900. It can also provide heat dissipation for the stator 610 and rotor of the motor 100, improving the heat dissipation efficiency of the motor 100.

[0097] The various embodiments or implementation methods described in this specification are presented in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the embodiments can be referred to each other.

[0098] It should be noted that phrases such as "in specific implementations," "in some embodiments," "in this embodiment," and "exemplarily" in the specification indicate that the described embodiments may include specific features, structures, or characteristics, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Moreover, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not, is within the knowledge scope of those skilled in the art.

[0099] Finally, it should be noted that other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This invention is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein, and is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of the invention is limited only by the appended claims.

Claims

1. An electric motor, characterized in that, include: The housing (200) is provided with an oil inlet (220) and an oil outlet (230), both of which allow cooling oil to flow through. Piping assembly (300), the piping assembly (300) being connected to the oil inlet (220) and the oil outlet (230); A rotor shaft (400) is rotatably mounted on the housing (200). The rotor shaft (400) has at least one oil passage groove (410) in its circumferential direction. The oil passage groove (410) is connected to the oil inlet (220) and the oil outlet (230) through the pipeline assembly (300). The rotor shaft (400) drives the cooling oil in the oil passage groove (410) to flow during rotation.

2. The motor according to claim 1, characterized in that, The oil passages (410) are arranged side by side along the first direction on the outer periphery of the rotor shaft (400).

3. The motor according to claim 2, characterized in that, The housing (200) has a housing shaft (240) in the first direction, and the housing shaft (240) is disposed corresponding to the inner circumference of the rotor shaft (400); The housing shaft (240) is provided with an oil outlet (241) and an oil return port (242) in the axial direction. The oil outlet (241) is connected to the oil inlet (220), and the oil return port (242) is connected to the oil outlet (230).

4. The motor according to claim 3, characterized in that, The piping assembly (300) includes: a rotor piping (310); The rotor pipeline (310) includes a rotor oil inlet ring (311), a rotor oil inlet pipe (312), a rotor oil return pipe (313), and a rotor oil return ring (314). The rotor oil inlet ring (311) is connected to the oil outlet (241), and the rotor oil return ring (314) is connected to the oil return outlet (242). One end of the rotor oil inlet pipe (312) is connected to the rotor oil inlet ring (311), and the other end of the rotor oil inlet pipe (312) is connected to the oil passage groove (410) on the outer periphery of the rotor shaft (400). One end of the rotor return oil pipe (313) is connected to the rotor return oil ring (314), and the other end of the rotor return oil pipe (313) is connected to the oil passage groove (410) on the outer periphery of the rotor shaft (400).

5. The motor according to claim 4, characterized in that, The rotor inlet ring (311) and the rotor return ring (314) are arranged side by side along the first direction on the inner circumference of the rotor shaft (400); The rotor oil inlet pipe (312) and the rotor oil return pipe (313) are arranged side by side along the first direction.

6. The motor according to claim 5, characterized in that, The piping assembly (300) further includes: stator piping (320); The stator pipeline (320) includes a fixed connector (321) and a fixed pipeline (322). One end of the fixed connector (321) is installed in the oil outlet (230), and the other end of the fixed connector (321) is connected to the fixed pipeline (322). The housing (200) is provided with a cooling end (250) and an oil outlet end (260) in the circumferential direction. The fixed pipeline (322) is connected to the cooling end (250), and the cooling end (250) and the oil outlet end (260) are connected.

7. The motor according to claim 3, characterized in that, Also includes: Sealing assembly (500); The sealing assembly (500) seals the abutment surface between the housing shaft (240) and the rotor shaft (400).

8. The motor according to any one of claims 2-7, characterized in that, Also includes: Stator assembly (600), the stator assembly (600) being mounted on the inner sidewall of the housing (200); The stator assembly (600) includes a stator (610) and a stator retaining ring (620), the stator retaining ring (620) being located on one side of the stator (610) in the first direction to axially limit the stator (610).

9. The motor according to claim 8, characterized in that, Also includes: A rotor assembly (700) is sleeved on the rotor shaft (400) and the rotor assembly (700) is located on the inner circumferential side of the stator assembly (600); The rotor assembly (700) includes a magnet assembly (710) and a mounting ring (720), the magnet assembly (710) being connected to the mounting ring (720), and the mounting ring (720) cooperating with the oil passage (410) on the outer periphery of the rotor shaft (400).

10. A thermal management system, characterized in that, It includes a pump body (910), a filter (920), a heat exchanger (930), an oil tank (940), a detection assembly (950), and a motor (100) as described in any one of claims 1-9. The oil outlet (260) of the motor is connected to the heat exchanger (930) through at least part of the detection component (950) and the filter (920), and the output end of the heat exchanger (930) has a first branch and a second branch. The heat exchanger (930) is connected to at least a portion of the detection assembly (950) and the oil inlet (220) of the motor via a valve body (960), forming the first branch; The heat exchanger (930) is connected in sequence to the oil tank (940), the filter (920) and the pump body (910), and is connected to the oil inlet (220) of the motor through at least part of the detection component (950), forming the second branch.

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