Motor cooling structure, motor and aircraft

Abstract

The utility model provides a motor cooling structure, a motor and an aircraft. The motor cooling structure comprises a motor housing with an installation space, and an oil pumping member, a rotor assembly and a stator assembly which are all installed in the installation space. The stator assembly is rotationally sleeved on the rotor assembly; the outer side wall, deviating from the rotor assembly, of the stator assembly is fixedly connected with the motor shell; the motor shell is provided with an oil storage space communicated with the installation space and a conveying oil channel communicated with the oil storage space. A heat dissipation oil groove is formed in the outer side wall of the side, connected with the motor shell, of the stator assembly. The heat dissipation oil groove is communicated between the conveying oil duct and the mounting space; the oil pumping piece is installed on the rotor assembly and located on the conveying oil channel, and the oil pumping piece is used for rotating along with the rotor assembly so as to drive the cooling oil in the oil storage space to enter the installation space through the conveying oil channel and the heat dissipation oil groove. According to the utility model, the size of the motor cooling structure is reduced, the motor structure is simplified, and the processing difficulty of the motor shell is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of motors, and in particular relates to a motor cooling structure, a motor and an aircraft. Background Art

[0002] During the operation of the motor, a large amount of heat will be generated. Therefore, it is necessary to dissipate the heat of the running motor in time to avoid damage to the motor. In the prior art, the heat of the motor is generally dissipated by additionally setting a radiator or heat exchanger on the motor, and the radiator or heat exchanger also needs to be synchronously configured with a driving device such as an electronic pump to drive its operation. The above method not only increases the number of parts and installation space of the motor, resulting in an increase in the size, weight and cost of the motor, but also makes the motor structure design more complicated, increasing the difficulty of motor manufacturing. Summary of the invention

[0003] The utility model aims to solve the technical problems in the prior art such as large size and complex structure of the motor cooling structure, and provides a motor cooling structure, a motor and an aircraft.

[0004] In view of the above technical problems, an embodiment of the utility model provides a motor cooling structure, comprising a motor housing with an installation space, and an oil pump component, a rotor assembly and a stator assembly all installed in the installation space; the stator assembly is rotatably sleeved on the rotor assembly; the outer side wall of the stator assembly facing away from the rotor assembly is fixedly connected to the motor housing;

[0005] The motor housing is provided with an oil storage space connected to the installation space, and an oil delivery channel connected to the oil storage space; the outer wall of the stator assembly connected to the motor housing is provided with a heat dissipation oil groove; the heat dissipation oil groove is connected between the delivery oil channel and the installation space; the oil pump component is installed on the rotor assembly and located on the delivery oil channel, and the oil pump component is used to rotate with the rotor assembly to drive the cooling oil in the oil storage space through the delivery oil channel and the heat dissipation oil groove into the installation space.

[0006] Optionally, the motor housing is provided with a heat sink for dissipating the cooling oil in the heat dissipation oil groove, and the heat sink is arranged on an outer side wall of the motor housing away from the stator assembly at a position opposite to the heat dissipation oil groove.

[0007] Optionally, the motor cooling structure also includes an oil spray ring installed on the stator assembly and connected to the motor housing; an annular space connected to the heat dissipation oil groove is provided between the oil spray ring and the motor housing, and a plurality of oil spray holes connected between the annular space and the installation space are provided on the oil spray ring; the oil pump is used to drive the cooling oil in the oil storage space through the delivery oil channel and the heat dissipation oil groove into the annular space, and then spray it into the installation space through the oil spray holes.

[0008] Optionally, the heat dissipation oil groove includes a circumferential oil groove and an axial oil groove; the circumferential oil groove is connected to the delivery oil channel; and the axial oil groove is connected between the axial oil groove and the annular space.

[0009] Optionally, the heat dissipation oil groove includes a plurality of axial oil grooves arranged at intervals; the motor housing is provided with a heat sink for dissipating the cooling oil in the heat dissipation oil groove, the heat sink includes a plurality of groups of heat dissipation fins, and the plurality of groups of heat dissipation fins are arranged one-to-one with each of the axial oil grooves on the outer side wall of the motor housing away from the stator assembly.

[0010] Optionally, the motor cooling structure further comprises an oil baffle ring disposed on the oil injection ring and abutting against the motor housing; the motor housing, the oil baffle ring and the oil injection ring form the annular space.

[0011] Optionally, the motor cooling structure further includes a first sealing ring sealed between the oil injection ring and the stator assembly.

[0012] Optionally, the motor housing includes a shell fixedly sleeved on the outer side wall of the stator assembly, and a first end cover connected to the shell; the delivery oil passage includes an end cover oil passage arranged on the first end cover, and a shell oil passage arranged on the shell;

[0013] The end cover oil passage is connected between the oil storage space and the outer shell oil passage; the end of the outer shell oil passage away from the end cover oil passage is connected to the heat dissipation oil groove; the oil pump part is located on the end cover oil passage and is used to drive the cooling oil flow in the end cover oil passage; the oil injection ring is connected between the stator assembly and the first end cover.

[0014] Optionally, the motor cooling structure further includes a second sealing ring sealed between the oil injection ring and the first end cover.

[0015] Optionally, the rotor assembly includes a rotating shaft and a rotor winding fixedly sleeved on the rotating shaft; the oil pumping member is installed on the rotating shaft; the first end cover includes an end cover body provided with a mounting groove and a pump cover covering the mounting groove; the oil pumping member is installed in the mounting groove;

[0016] The end cover body is provided with an oil suction channel connected between the oil storage space and the mounting groove, and an oil outlet channel connected between the mounting groove and the heat dissipation oil groove; the end cover oil channel includes the oil suction channel, the mounting groove and the oil outlet channel.

[0017] Optionally, a first oil return port is provided on the first end cover; the first oil return port is connected between the installation space and the oil storage space.

[0018] Optionally, the motor housing also includes a second end cover connected to the outer shell; the second end cover and the first end cover are respectively arranged on opposite sides of the outer shell; the first end cover, the outer shell and the second end cover enclose the installation space; the second end cover is provided with a second oil return port; the second oil return port is connected between the installation space and the oil storage space.

[0019] Optionally, the motor cooling structure further comprises a filter for filtering impurities in the cooling oil; the filter is connected between the oil storage space and the oil delivery channel.

[0020] A motor comprises the motor cooling structure.

[0021] An aircraft comprises the motor.

[0022] The motor cooling structure of the utility model comprises a motor housing with an installation space, and an oil pump component, a rotor assembly and a stator assembly all installed in the installation space; the stator assembly is rotatably sleeved on the rotor assembly; the outer side wall of the stator assembly away from the rotor assembly is fixedly connected to the motor housing; the motor housing is provided with an oil storage space connected to the installation space, and an oil delivery channel connected to the oil storage space; a heat dissipation oil groove is provided on the outer side wall of the stator assembly connected to the motor housing; the heat dissipation oil groove is connected between the delivery oil channel and the installation space; the oil pump component is installed on the rotor assembly and located on the delivery oil channel, and the oil pump component is used to rotate with the rotor assembly to drive the cooling oil in the oil storage space to enter the installation space through the delivery oil channel and the heat dissipation oil groove.

[0023] In the utility model, when the motor is working, the rotor assembly will rotate, and the oil pump will rotate with the rotor assembly, thereby driving the cooling oil in the oil storage space to circulate between the oil delivery channel, the heat dissipation oil tank, the installation space and the oil storage space, and then the heat generated by the motor heating components in the installation space is taken away by the cooling oil to cool the motor. The utility model can cool the motor without the need for an additional external heat exchanger. Moreover, when the motor starts working, the utility model can automatically drive the oil pump to circulate the cooling oil through the rotor assembly to dissipate the heat of the motor, without the need for additional driving devices such as electronic pumps. Therefore, the above-mentioned overall design greatly reduces the volume and weight of the motor cooling structure, simplifies the motor structure, and reduces the manufacturing cost.

[0024] At the same time, the heat dissipation oil groove for dissipating the cooling oil in the motor cooling structure is arranged on the outer side wall of the stator assembly connected to the motor housing. In this way, the cooling oil flowing through the heat dissipation oil groove can discharge the heat through the motor housing by contacting with the motor housing fitted therewith. In addition, since the manufacture of the stator assembly is relatively simple, the heat dissipation oil groove is arranged on the stator assembly, which will reduce the manufacturing difficulty of the heat dissipation oil groove. Only the conveying channel needs to be arranged on the motor housing, without the need to arrange the heat dissipation oil groove over a large area, which also reduces the processing difficulty of the motor housing. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0026] Figure 1 It is a structural schematic diagram of a motor cooling structure provided by an embodiment of the utility model.

[0027] Figure 2 It is a structural schematic diagram of a housing of a motor cooling structure provided by an embodiment of the utility model.

[0028] Figure 3 It is a structural schematic diagram of a first end cover of a motor cooling structure provided by an embodiment of the utility model.

[0029] Figure 4 It is a structural schematic diagram of a first end cover of a motor cooling structure provided by yet another embodiment of the utility model.

[0030] Figure 5 It is a structural schematic diagram of a second end cover of a motor cooling structure provided by an embodiment of the utility model.

[0031] Figure 6 It is a structural schematic diagram of an oil pump component of a motor cooling structure provided by an embodiment of the utility model.

[0032] Figure 7 It is a structural schematic diagram of a stator assembly of a motor cooling structure provided by an embodiment of the utility model.

[0033] Figure 8 It is a structural schematic diagram of an oil injection ring of a motor cooling structure provided by an embodiment of the utility model.

[0034] Fig. 9 It is a schematic diagram of the connection structure of the oil injection ring of the motor cooling structure provided by one embodiment of the utility model.

[0035] The reference numerals in the specification are as follows:

[0036] 100, motor housing; 110, installation space; 120, oil storage space; 130, oil delivery channel; 131, end cover oil channel; 132, housing oil channel; 140, heat sink; 150, housing; 160, first end cover; 161, installation groove; 162, end cover body; 163, pump cover; 164, oil suction channel; 165, oil outlet channel; 166, first oil return port; 170, second end cover; 171, second oil return port; 200, pump oil Components; 210, inner rotor; 220, outer rotor; 300, rotor assembly; 310, rotating shaft; 320, rotor winding; 400, stator assembly; 410, heat dissipation oil groove; 411, circumferential oil groove; 412, axial oil groove; 500, oil injection ring; 510, annular space; 520, oil injection hole; 530, oil retaining ring; 600, first sealing ring; 700, second sealing ring; 800, filter; 900, oil seal; 1000, bearing. DETAILED DESCRIPTION

[0037] In order to make the technical problems, technical solutions and beneficial effects solved by the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0038] It should be understood that the directions or positional relationships indicated by terms such as "upper", "lower", "left", "right", "front", "back", and "middle" are based on the directions or positional relationships shown in the accompanying drawings and are only used to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation of the present invention.

[0039] Currently, most oil-cooled motors on the market require a separate water-oil heat exchange radiator and a separate electronic pump, which increases component installation space, assembly weight and cost, and also complicates the structure of the electric drive assembly.

[0040] The utility model adopts a motor-direct-driven rotor pump to eliminate the external heat exchanger. At the same time, due to the high wind speed on the outer surface of the motor, the motor is directly cooled by heat dissipation ribs on the surface of the motor casing, forming a cooling oil-air mixed cooling method. This heat dissipation method has a simple structure, a small motor weight, and a relatively low cost, and is very forward-looking.

[0041] like Figure 1 As shown, an embodiment of the utility model provides a motor cooling structure, comprising a motor housing 100 having an installation space 110, and an oil pump 200, a rotor assembly 300 and a stator assembly 400 all installed in the installation space 110; the stator assembly 400 is rotatably sleeved on the rotor assembly 300; the outer side wall of the stator assembly 400 away from the rotor assembly 300 is fixedly connected to the motor housing 100; the motor housing 100 is provided with an oil storage space 120 connected to the installation space 110, and an oil delivery passage 130 connected to the oil storage space 120; the stator assembly 400 is rotatably sleeved on the rotor assembly 300; the outer side wall of the stator assembly 400 away from the rotor assembly 300 is fixedly connected to the motor housing 100; the motor housing 100 is provided with an oil storage space 120 connected to the installation space 110, and an oil delivery passage 130 connected to the oil storage space 120; 00 is provided with a heat dissipation oil groove 410 on the outer side wall connected to one side of the motor housing 100; thus, the heat dissipation oil groove 410 is located between the stator assembly 400 and the motor housing 100, and the heat dissipation oil groove 410 is connected between the oil delivery passage 130 and the installation space 110; the oil pumping member 200 is installed on the rotor assembly 300 and is located on the oil delivery passage 130, and the oil pumping member 200 is used to rotate with the rotor assembly 300 to drive the cooling oil in the oil storage space 120 to enter the installation space 110 through the oil delivery passage 130 and the heat dissipation oil groove 410.

[0042] It can be understood that the oil pumping member 200 is integrated in the motor to realize the oil pumping function; the oil pumping member 200 can be a cycloid pump rotor; Figure 6 As shown, the cycloid pump rotor includes an inner rotor 210 and an outer rotor 220 that can rotate relative to the inner rotor 210; the inner rotor 210 is connected to the rotating shaft 310. The oil storage space 120 is connected to the installation space 110, so that the coolant in the installation space 110 can flow to the oil storage space 120 to achieve the circulation of the cooling oil.

[0043] In one embodiment, the oil storage space 120 is an oil storage tank opened at the bottom of the motor housing 100; wherein, the bottom of the motor housing 100 refers to the bottom of the motor housing 100 when the motor is installed and used, so that the cooling oil can automatically flow into the oil storage tank from the installation space under the action of gravity. The motor housing 100 covers the heat dissipation oil tank 410, so that the cooling oil in the heat dissipation oil tank 410 flows between the motor housing 100 and the stator assembly 300. When the cooling oil flows through the heat dissipation oil tank 410, it can contact the motor housing 100, and then the heat can be discharged through the motor housing 100 to achieve heat dissipation of the cooling oil. Furthermore, the heat dissipation oil tank 410 can also be directly formed on the stator assembly 400 by lamination processing using laminations matching the heat dissipation oil tank 410 when the stator assembly 400 is processed, thereby avoiding additional processing steps. In the present invention, the heat dissipation oil groove 410 can also be formed on the outer wall of the stator assembly 400 by turning, milling or other methods, which is not limited here.

[0044] Among them, Figure 1 As shown, the stator assembly 400 is roughly annularly arranged and fitted on the inner side wall of the motor housing 100, and the heat dissipation oil groove 410 can also be annularly arranged on the outer side wall of the stator assembly 400 facing the motor housing 100, so as to increase the contact area between the cooling oil and the motor housing 100 and improve the heat dissipation efficiency. The specific shape and arrangement of the heat dissipation oil groove 410 can be set according to the needs, as long as it can be connected with the oil delivery channel 130 and the installation space 110, and then absorb the heat on the motor heating components (such as the rotor assembly 300 and / or the stator assembly 400, etc.) installed in the installation space 110 when flowing through the installation space 110. The rotor assembly 300 is rotatably connected to the stator assembly 400. The connection method of the stator assembly 400 and the motor housing 100 includes but is not limited to one or more of the interference connection, welding or integral connection, as long as a fixed connection is formed between the stator assembly 400 and the motor housing 100.

[0045] In this embodiment, the motor cooling structure is applied to the motor. The oil storage space 120, the oil delivery channel 130, the heat dissipation oil groove 410 and the installation space 110 together form a circulation loop for the circulation of cooling oil. When the motor is running, the oil pump 200 is directly driven by the rotating rotor assembly 300, so that the oil pump 200 drives the cooling oil in the oil storage space 120 to circulate between the oil delivery channel 130, the heat dissipation oil groove 410, the installation space 110 and the oil storage space 120, and then when the cooling oil flows through the installation space 110, it absorbs the heat (oil cooling) on ​​the rotor assembly 300 and / or the stator assembly 400 installed in the installation space 110, and when the cooling oil flows through the heat dissipation oil groove 410, the cooling oil in the heat dissipation oil groove 410 is dissipated through the motor housing 100 (air cooling), realizing a mixed cooling method of oil cooling and air cooling. Furthermore, the motor cooling structure can be applied to motors used in movable vehicles such as aircraft (the aircraft can be a vertical take-off and landing rotorcraft, etc.). It can be understood that when the movable vehicle moves, the motor starts to work, and at this time, a large airflow will be generated on the outer surface of the motor housing 100. The motor cooling structure can use the above airflow to more efficiently dissipate the cooling oil in the heat dissipation oil groove 410 through the motor housing 100.

[0046] In one embodiment, the stator assembly 400 includes components such as a stator core and a stator winding. The heat dissipation oil groove 410 is disposed on the stator core. It can be understood that the stator winding can drive the rotor winding 320, so that the rotor winding 320 drives the rotating shaft 310 to rotate.

[0047] In the above embodiment of the utility model, when the motor is working, the rotor assembly 300 will rotate, and at this time the oil pump part 200 will rotate with the rotor assembly 300, thereby driving the cooling oil in the oil storage space 120 to circulate between the oil delivery channel 130, the heat dissipation oil groove 410, the installation space 110 and the oil storage space 120, and then the heat generated by the motor heating components in the installation space 110 is taken away by the cooling oil to cool the motor. The utility model can cool the motor without the need for an additional external heat exchanger. Moreover, when the motor starts working, the utility model can automatically drive the oil pump part 200 through the rotor assembly 300 to drive the cooling oil to circulate to dissipate heat from the motor, without the need for additional electronic pumps and other driving devices. Therefore, in the utility model, the motor cooling mechanism is an oil-air mixed cooling method, without the need for an external radiator and driving device, and no additional cooling water channel needs to be designed on the motor housing 100. The above overall design greatly reduces the volume and weight of the motor cooling structure, simplifies the motor structure, and reduces the manufacturing cost.

[0048] At the same time, the heat dissipation oil groove 410 for dissipating the cooling oil in the motor cooling structure is arranged on the outer wall of the stator assembly 400 connected to the motor housing 100. In this way, the cooling oil flowing through the heat dissipation oil groove 410 can discharge the heat through the motor housing 100 by contacting the motor housing 100 that is in contact with it. In addition, since the manufacture of the stator assembly 300 is relatively simple, the heat dissipation oil groove is arranged on the stator assembly, which will reduce the manufacturing difficulty of the heat dissipation oil groove (the stator core laminations of the stator assembly 300 are relatively simple to manufacture, and the heat dissipation oil groove 410 is arranged on the stator core), and only the conveying channel 130 needs to be arranged on the motor housing 100 (the heat dissipation oil groove 410 is the most important cooling oil channel in the motor cooling structure, and the conveying oil channel 130 in the motor housing 100 can also dissipate the cooling oil to a certain extent, but it is mainly responsible for conveying the cooling oil. Therefore, it only needs to be manufactured from the direction of easy processing according to the specific structure of the motor housing 100) without arranging the heat dissipation oil groove 410 over a large area, which greatly reduces the processing difficulty of the motor housing 100.

[0049] In one embodiment, if Figure 1 and Figure 2 As shown, the motor housing 100 is provided with a heat sink 140 for dissipating heat from the cooling oil in the heat sink oil groove 410, and the heat sink 140 is arranged on the outer wall of the motor housing 100 away from the stator assembly 400 at a position opposite to the heat sink oil groove 410. It can be understood that the heat sink 140 can increase the heat dissipation area of ​​the motor housing 100, thereby improving the heat dissipation efficiency of the motor housing 100. The heat sink 140 is arranged at a position opposite to the heat sink oil groove 410, so that the heat in the heat sink oil groove 410 can be more efficiently exported, avoiding heat accumulation. The shape of the heat sink 140 can be set as needed, as long as the heat dissipation area of ​​the motor housing 100 can be increased, thereby improving the heat dissipation efficiency of the motor housing 100.

[0050] In one embodiment, if Figure 1 , Figure 7 and Figure 8 As shown, the motor cooling structure also includes an oil injection ring 500 installed on the stator assembly 400 and connected to the motor housing 100; an annular space 510 connected to the heat dissipation oil groove 410 is provided between the oil injection ring 500 and the motor housing 100, and a plurality of oil injection holes 520 connected between the annular space 510 and the installation space 110 are provided on the oil injection ring 500; the oil pump 200 is used to drive the cooling oil in the oil storage space 120 to pass through the oil delivery channel 130 and the heat dissipation oil groove 410 into the annular space 510, and then sprayed to the installation space 110 through the oil injection holes 520.

[0051] In the present invention, the number of the oil injection ring 500 can be one or more, and the position of the oil injection ring 500 can be set according to the actual situation. Figure 1 As shown, the oil spray ring 500 can be set to two. In this case, the two oil spray rings 500 can be installed at opposite ends of the stator assembly 400 in a direction parallel to the rotating shaft 310 of the rotor assembly 300; in this case, cooling oil can be sprayed on the rotor assembly 300 and / or the stator assembly 400 in the installation space 110 at both ends of the stator assembly 400, thereby increasing the spray area of ​​the cooling oil and thereby improving the cooling effect. The design of the above-mentioned oil spray holes 520 can also increase the oil pressure of the cooling oil, and a plurality of the oil spray holes 520 can be arranged at intervals (preferably evenly spaced) on the oil spray ring 500. Therefore, when the cooling oil in the heat dissipation oil groove 410 enters the installation space 110 and is sprayed into the installation space 110 through the oil spray holes 520, the cooling oil with a certain oil pressure can be sprayed onto the rotor assembly 300 and / or the stator assembly 400 in the installation space 100 in the entire circumference of the oil spray ring 500, so that the cooling process is more uniform and efficient, thereby improving the cooling efficiency of the cooling oil.

[0052] In one embodiment, if Figure 7 As shown, the heat dissipation oil groove 410 includes a circumferential oil groove 411 and an axial oil groove 412; the circumferential oil groove 411 is connected to the delivery oil channel 130; the axial oil groove 412 is connected between the axial oil groove 412 and the annular space 510. The axial direction in the present invention refers to a direction parallel to the rotating shaft 310 of the rotor assembly 300; and the circumferential direction refers to a direction surrounding the rotating shaft 310. It can be understood that the circumferential oil groove 411 is arranged roughly along the circumference of the stator assembly 400, and further, the circumferential oil groove 411 is arranged perpendicular to the rotating shaft 310. The width of the circumferential oil groove 411 can be set as required. The axial oil groove 412 is arranged roughly along the axial direction of the stator assembly 400, and the axial oil groove 412 can be set in one or more groups as required. Each group of the axial oil grooves 412 can be formed by one or more axial oil grooves arranged in parallel. A plurality of groups of axial oil grooves 412 can be arranged on the outer wall of the stator assembly 400 at circumferential intervals along the stator assembly 400 according to actual conditions. For example, according to the size of the airflow on the surface of the motor housing 100, they can be arranged on the outer wall of the stator assembly 400 corresponding to the position of the motor housing 100 where the airflow is greater, thereby improving the heat dissipation efficiency.

[0053] In one embodiment, if Figure 1 to Figure 2 , Figure 7As shown, the heat dissipation oil groove 410 includes a plurality of axial oil grooves 412 arranged at intervals; the motor housing 100 is provided with a heat sink 140 for dissipating the cooling oil in the heat dissipation oil groove 410, and the heat sink 140 includes a plurality of heat dissipation fins, and the plurality of heat dissipation fins are arranged on the outer side wall of the motor housing 100 away from the stator assembly 400 in a one-to-one correspondence with each of the axial oil grooves 410. It can be understood that the heat dissipation fins correspond to each of the axial oil grooves 412 in a one-to-one correspondence, so that the heat in the cooling oil in the axial oil grooves 412 can be more quickly extracted. The direction of the heat dissipation fins can be set according to the airflow conditions on the motor housing 100 to avoid mutual influence between the plurality of heat dissipation fins. For example: if the motor cooling structure is used in a ducted motor of a flying car, the airflow on the motor housing 100 is generally parallel to the axial direction of the stator assembly 400, and the heat dissipation fins can be arranged parallel to the axial direction of the stator assembly 400; if the motor cooling structure is used in a motor whose surface is not affected by airflow or the airflow is small, the heat dissipation fins can be arranged according to actual conditions, as long as the heat dissipation area can be increased. The heat dissipation fins can be manufactured by extrusion process, which is simpler than the die casting process, has low manufacturing difficulty, and reduces manufacturing cost.

[0054] In one embodiment, if Figure 1 and Fig. 9 As shown, the motor cooling structure further includes an oil retaining ring 530 disposed on the oil injection ring 500 and abutting against the motor housing 100; the motor housing 100, the oil retaining ring 530 and the oil injection ring 500 enclose the annular space 510. It can be understood that the oil injection hole 520 is located between the oil retaining ring 530 and the stator assembly 400, so that the annular space 510 and the installation space 110 can be connected. The end of the oil retaining ring 530 facing the motor housing 100 can abut against the motor housing 100 and form a seal between the motor housing 100, and a seal can also be provided between the oil retaining ring 530 and the motor housing 100 to achieve sealing, so as to prevent the cooling oil in the annular space 510 from leaking through the position where the oil injection ring 500 abuts against the motor housing 100.

[0055] In one embodiment, if Figure 1 and Fig. 9 As shown, the motor cooling structure further includes a first sealing ring 600 sealed between the oil injection ring 500 and the stator assembly 400. It can be understood that the first sealing ring 600 is provided between the oil injection ring 500 and the stator assembly 400 to prevent the cooling oil in the installation space 110 from leaking through the connection position between the oil injection ring 500 and the stator assembly 400.

[0056] In one embodiment, if Figure 1 , Figure 3 and Figure 4 As shown, the motor housing 100 includes a shell 150 fixedly sleeved on the outer wall of the stator assembly 400, and a first end cover 160 connected to the shell 150; the delivery oil passage 130 includes an end cover oil passage 131 arranged on the first end cover 160, and a shell oil passage 132 arranged on the shell 150; the end cover oil passage 131 is connected between the oil storage space 120 and the shell oil passage 132; the end of the shell oil passage 132 away from the end cover oil passage 131 is connected to the heat dissipation oil groove 410; the oil pump part 200 is located on the end cover oil passage 131 and is used to drive the cooling oil in the end cover oil passage 131 to flow; the oil injection ring 500 is connected between the stator assembly 400 and the first end cover 160.

[0057] It can be understood that the connection method between the first end cover 160 and the housing 150 includes, but is not limited to, one or more of the following methods: screw connection, riveting, welding, or integral molding. The end cover oil passage 131 can be arranged on the first end cover 160 according to actual conditions, as long as the oil storage space 120 can be connected to the housing oil passage 132. The end cover oil passage 131 can be arranged on the first end cover 160 by casting or machining. The housing oil passage 132 can be arranged on the housing 150 according to actual conditions, as long as the end cover oil passage 131 can be connected to the heat dissipation oil groove 410. When the first end cover 160 is installed on the housing 150, the oil injection ring 500 can be abutted between the stator assembly 400 and the first end cover 160 through the fastening force between the first end cover 160 and the housing 150, thereby improving the sealing performance.

[0058] In one embodiment, if Figure 1 and Fig. 9 As shown, the motor cooling structure further includes a second sealing ring 700 sealedly connected between the oil injection ring 500 and the first end cover 160. It can be understood that the second sealing ring 700 is provided between the oil injection ring 500 and the first end cover 160 to prevent the cooling oil in the annular space 510 from leaking from the connection position between the oil injection ring 500 and the first end cover 160. In addition, when the first end cover 160 is installed on the housing 150, the fastening force between the first end cover 160 and the housing 150 will be applied to the first sealing ring 600 and / or the second sealing ring 700, so that the oil injection ring 500 is firmly pressed between the stator assembly 400 and the first end cover 160 to improve the sealing performance, and also prevent the oil injection ring 500 from being damaged due to the fastening force.

[0059] In one embodiment, if Figure 1 , Figure 3 and Figure 4 As shown, the rotor assembly 300 includes a rotating shaft 310 and a rotor winding 320 fixedly sleeved on the rotating shaft 310; the oil pumping member 200 is installed on the rotating shaft 310; the first end cover 160 includes an end cover body 162 provided with a mounting groove 161 and a pump cover 163 covering the mounting groove 161; the oil pumping member 200 is installed in the mounting groove 161; the end cover body 162 is provided with an oil suction channel 164 connecting between the oil storage space 120 and the mounting groove 161, and an oil outlet channel 165 connecting between the mounting groove 161 and the heat dissipation oil groove 410; the end cover oil passage 131 includes the oil suction channel 164, the mounting groove 161 and the oil outlet channel 165. It can be understood that the connection method between the rotating shaft 310 and the oil pumping component 200 includes but is not limited to one or more of the methods such as clamping, screw connection, welding or integral molding, as long as the oil pumping component 200 can rotate with the rotating shaft 310 to achieve the oil pumping function. The connection method between the pump cover 163 and the end cover body 162 includes but is not limited to one or more of the methods such as threaded connection, screw connection, riveting, welding or integral molding. After the pump cover 163 is installed on the end cover body 162, the depth of the mounting groove 161 is greater than or equal to the thickness of the rotor, so that after the rotor is installed in the mounting groove 161, there is still a certain gap between the rotor and the inner wall of the mounting groove 161, thereby ensuring that the rotor can rotate normally in the mounting groove 161. The oil pumping component 200 can be a cycloid pump rotor; Figure 6 As shown, the cycloid pump rotor includes an inner rotor 210 and an outer rotor 220 that can rotate relative to the inner rotor 210; both the inner rotor 21 and the outer rotor 220 can rotate in the mounting groove 161, and the inner rotor 210 is connected to the rotating shaft 310 to drive the inner rotor 210 and the outer rotor 210 to rotate relative to each other through the rotating shaft 310. In this embodiment, the oil pumping member 200 is integrated in the motor housing 100 to realize the oil pumping function, thereby reducing the volume of the motor cooling structure.

[0060] In one embodiment, if Figure 1 , Figure 3 and Figure 4As shown, the first end cover 160 is provided with a first oil return port 166; the first oil return port 166 is connected between the installation space 110 and the oil storage space 120. It can be understood that the oil storage space 120 can be located at the bottom of the installation space 110, that is, the oil storage space 120 is located at the bottom of the installation space 110 when the motor is installed and used. The first oil return port 166 can be set at a position on the first end cover 160 corresponding to the bottom of the installation space 110, so that the cooling oil in the installation space 110 can flow to the oil storage space 120 through the first oil return port 166 located at the bottom under the action of gravity, without the need to set up other driving devices for driving the cooling oil to flow back from the installation space 110 to the oil storage space 120.

[0061] In one embodiment, if Figure 1 and Figure 5 As shown, the motor housing 100 further includes a second end cover 170 connected to the housing 150; the second end cover 170 and the first end cover 160 are respectively arranged on opposite sides of the housing 150; the first end cover 160, the housing 150 and the second end cover 170 enclose the installation space 110; the second end cover 170 is provided with a second oil return port 171; the second oil return port 171 is connected between the installation space 110 and the oil storage space 120. It can be understood that the connection method between the second end cover 170 and the housing 150 includes but is not limited to one or more of the methods of screw connection, riveting, welding or integral molding. The second oil return port 171 can be arranged at a position on the first end cover 160 corresponding to the bottom of the installation space 110, so that the cooling oil in the installation space 110 can flow to the oil storage space 120 through the second oil return port 171 located at the bottom under the action of gravity without providing other driving devices for driving the cooling oil to flow back from the installation space 110 to the oil storage space 120. Furthermore, the first oil return port 166 and the second oil return port 171 are respectively disposed on the first end cover 160 and the second end cover 170 located on opposite sides of the installation space 110 , thereby increasing the oil return speed.

[0062] In one embodiment, if Figure 1 As shown, the motor cooling structure further includes an oil seal 900 disposed between the second end cover 170 and the rotating shaft 310. The oil seal 900 is interference-connected with the second end cover 170, thereby preventing the cooling oil in the installation space 110 from leaking from the connection position between the second end cover 170 and the rotating shaft 310.

[0063] In one embodiment, if Figure 1As shown, the rotor assembly 300 also includes a bearing 1000 arranged between the rotating shaft 310 and the first end cover 160 and the second end cover 170; the rotating shaft 310 is rotatably connected to the first end cover 160 and the second end cover 170 through the bearing 1000, so that the rotating shaft 310 can rotate relative to the first end cover 160 and the second end cover 170.

[0064] In one embodiment, if Figure 1 As shown, the motor cooling structure further includes a filter 800 for filtering impurities in the cooling oil; the filter 800 is connected between the oil storage space 120 and the oil delivery channel 130. It can be understood that the filter 800 is used to filter the impurity particles in the cooling oil to prevent the rotating elements (such as the oil pump 200 or the bearing 1000, etc.) in the motor cooling structure from being worn due to the impurity particles. The filter 800 can be connected to the oil delivery channel 130 by screwing, clamping or welding.

[0065] An embodiment of the utility model further provides a motor, comprising the motor cooling structure. The specific structure of the motor cooling structure can refer to the above embodiment, and will not be repeated here. The motor can be a motor for aircraft, etc.

[0066] In the motor of the above-mentioned embodiment of the utility model, when the motor is working, the rotor assembly 300 of the motor cooling structure will rotate, and at this time, the oil pump component 200 will rotate with the rotor assembly 300, thereby driving the cooling oil in the oil storage space 120 to circulate between the oil delivery channel 130, the heat dissipation oil groove 410, the installation space 110 and the oil storage space 120, and then the heat generated by the motor heating components in the installation space 110 is taken away by the cooling oil to cool the motor. The utility model can cool the motor without the need for an additional external heat exchanger. Moreover, when the motor starts working, the utility model can automatically drive the oil pump component 200 through the rotor assembly 300 to drive the cooling oil to circulate to dissipate heat from the motor, without the need for additional driving devices such as electronic pumps. Therefore, the above-mentioned overall design greatly reduces the volume and weight of the motor cooling structure, simplifies the motor structure, and reduces the manufacturing cost. At the same time, the heat dissipation oil groove 410 for dissipating the cooling oil in the motor cooling structure is arranged on the outer wall of the stator assembly 400 connected to the motor housing 100. In this way, the cooling oil flowing through the heat dissipation oil groove 410 can discharge the heat through the motor housing 100 by contacting the motor housing 100 attached thereto, and since the manufacture of the stator assembly 300 is relatively simple, the heat dissipation oil groove is arranged on the stator assembly, which will reduce the manufacturing difficulty of the heat dissipation oil groove (the stator core laminations of the stator assembly 300 are relatively simple to manufacture, and the heat dissipation oil groove 410 is arranged on the stator core), and only the conveying channel 130 needs to be arranged on the motor housing 100, without the need to arrange the heat dissipation oil groove 410 over a large area, which greatly reduces the processing difficulty of the motor housing 100.

[0067] An embodiment of the utility model further provides an aircraft, comprising the motor. The specific structure of the motor can refer to the above embodiment, and will not be repeated here. The aircraft can be a vertical take-off and landing aircraft, such as a rotorcraft.

[0068] In the aircraft of the above-mentioned embodiment of the utility model, when the motor is working, the rotor assembly 300 of the motor cooling structure will rotate, and at this time, the oil pump part 200 will rotate with the rotor assembly 300, thereby driving the cooling oil in the oil storage space 120 to circulate between the oil delivery channel 130, the heat dissipation oil groove 410, the installation space 110 and the oil storage space 120, and then the heat generated by the motor heating components in the installation space 110 is taken away by the cooling oil to cool the motor. The utility model can cool the motor without the need for an additional external heat exchanger. Moreover, when the motor starts to work, the utility model can automatically drive the oil pump part 200 through the rotor assembly 300 to drive the cooling oil to circulate to dissipate heat from the motor, without the need for additional driving devices such as electronic pumps. Therefore, the above-mentioned overall design greatly reduces the volume and weight of the motor cooling structure, simplifies the motor structure, and reduces the manufacturing cost. At the same time, the heat dissipation oil groove 410 for dissipating the cooling oil in the motor cooling structure is arranged on the outer wall of the stator assembly 400 connected to the motor housing 100. In this way, the cooling oil flowing through the heat dissipation oil groove 410 can discharge the heat through the motor housing 100 by contacting the motor housing 100 attached thereto, and since the manufacture of the stator assembly 300 is relatively simple, the heat dissipation oil groove is arranged on the stator assembly, which will reduce the manufacturing difficulty of the heat dissipation oil groove (the stator core laminations of the stator assembly 300 are relatively simple to manufacture, and the heat dissipation oil groove 410 is arranged on the stator core), and only the conveying channel 130 needs to be arranged on the motor housing 100, without the need to arrange the heat dissipation oil groove 410 over a large area, which greatly reduces the processing difficulty of the motor housing 100.

[0069] The above are merely embodiments of the motor cooling structure, motor and aircraft of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A motor cooling structure, characterized in that: The invention comprises a motor housing having an installation space, and an oil pump component, a rotor assembly and a stator assembly all installed in the installation space; the stator assembly is rotatably sleeved on the rotor assembly; the outer side wall of the stator assembly facing away from the rotor assembly is fixedly connected to the motor housing; The motor housing is provided with an oil storage space connected to the installation space, and an oil delivery channel connected to the oil storage space; the outer wall of the stator assembly connected to the motor housing is provided with a heat dissipation oil groove; the heat dissipation oil groove is connected between the delivery oil channel and the installation space; the oil pump component is installed on the rotor assembly and located on the delivery oil channel, and the oil pump component is used to rotate with the rotor assembly to drive the cooling oil in the oil storage space through the delivery oil channel and the heat dissipation oil groove into the installation space.

2. The motor cooling structure according to claim 1, characterized in that: The motor housing is provided with a heat sink for dissipating the cooling oil in the heat dissipation oil groove. The heat sink is arranged on an outer side wall of the motor housing away from the stator assembly at a position opposite to the heat dissipation oil groove.

3. The motor cooling structure according to claim 1, characterized in that: The motor cooling structure further comprises an oil spray ring mounted on the stator assembly and connected to the motor housing; an annular space connected to the heat dissipation oil groove is provided between the oil spray ring and the motor housing, and a plurality of oil spray holes connected between the annular space and the mounting space are provided on the oil spray ring; The oil pump member is used to drive the cooling oil in the oil storage space to enter the annular space through the oil delivery channel and the heat dissipation oil groove, and then spray it into the installation space through the oil spray hole.

4. The motor cooling structure according to claim 3, characterized in that: The heat dissipation oil groove includes a circumferential oil groove and an axial oil groove; the circumferential oil groove is connected to the delivery oil channel; and the axial oil groove is connected between the axial oil groove and the annular space.

5. The motor cooling structure according to claim 4, characterized in that: The heat dissipation oil groove includes a plurality of axial oil grooves arranged at intervals; a heat sink for dissipating the cooling oil in the heat dissipation oil groove is provided on the motor housing, the heat sink includes a plurality of groups of heat dissipation fins, and the plurality of groups of heat dissipation fins are arranged one-to-one with each of the axial oil grooves on the outer side wall of the motor housing away from the stator assembly.

6. The motor cooling structure according to claim 3, characterized in that: The motor cooling structure further includes an oil baffle ring disposed on the oil injection ring and abutting against the motor housing; the motor housing, the oil baffle ring and the oil injection ring form an annular space.

7. The motor cooling structure according to claim 3, characterized in that: The motor cooling structure further includes a first sealing ring sealed between the oil injection ring and the stator assembly.

8. The motor cooling structure according to claim 3, characterized in that: The motor housing includes a shell fixedly sleeved on the outer side wall of the stator assembly, and a first end cover connected to the shell; the delivery oil passage includes an end cover oil passage arranged on the first end cover, and a shell oil passage arranged on the shell; The end cover oil passage is connected between the oil storage space and the outer shell oil passage; the end of the outer shell oil passage away from the end cover oil passage is connected to the heat dissipation oil groove; the oil pump part is located on the end cover oil passage and is used to drive the cooling oil flow in the end cover oil passage; the oil injection ring is connected between the stator assembly and the first end cover.

9. The motor cooling structure according to claim 8, characterized in that: The motor cooling structure further includes a second sealing ring sealed between the oil injection ring and the first end cover.

10. The motor cooling structure according to claim 8, characterized in that: The rotor assembly comprises a rotating shaft and a rotor winding fixedly sleeved on the rotating shaft; the oil pumping member is installed on the rotating shaft; the first end cover comprises an end cover body provided with a mounting groove and a pump cover covering the mounting groove; the oil pumping member is installed in the mounting groove; The end cover body is provided with an oil suction channel connected between the oil storage space and the mounting groove, and an oil outlet channel connected between the mounting groove and the heat dissipation oil groove; the end cover oil channel includes the oil suction channel, the mounting groove and the oil outlet channel.

11. The motor cooling structure according to claim 8, characterized in that: The first end cover is provided with a first oil return port; the first oil return port is connected between the installation space and the oil storage space.

12. The motor cooling structure according to claim 8, characterized in that: The motor housing also includes a second end cover connected to the outer shell; the second end cover and the first end cover are respectively arranged on opposite sides of the outer shell; the first end cover, the outer shell and the second end cover enclose the installation space; the second end cover is provided with a second oil return port; the second oil return port is connected between the installation space and the oil storage space.

13. The motor cooling structure according to claim 1, characterized in that: The motor cooling structure further comprises a filter for filtering impurities in the cooling oil; the filter is connected between the oil storage space and the oil delivery channel.

14. A motor, characterized in that: The motor cooling structure comprises the motor cooling structure as claimed in any one of claims 1 to 13.

15. An aircraft, characterized in that: Comprising the motor as claimed in claim 14.

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