A compound heat dissipation motor

Abstract

The present invention discloses a composite heat dissipation motor, which comprises a housing and a motor body disposed inside the housing. The motor body includes a stator and a rotor; a circulating liquid cooling structure and an axial air cooling structure are provided inside the housing; the circulating liquid cooling structure includes a coolant circulation channel, and the coolant circulation channel is a closed structure, including a first circulating liquid channel, a second circulating liquid channel, and a cooling chamber that communicate with each other. A centrifugal pump is rotatably disposed in the cooling chamber and is power-connected to the rotor through a magnetic gear transmission mechanism; the axial air cooling structure includes a shaftless fan blade and a first axial air duct and a second axial air duct that are connected and communicate with each other, and are used for discharging the heat of the rotor and inside the housing along the axial direction of the motor body. The beneficial effects of the present invention are: there are two cooling methods, namely a circulating liquid cooling structure and an axial air cooling structure, which effectively reduce the internal temperature of the motor, improve the load-bearing capacity and peak output capacity of the motor; there is no external power source, and the occupied space is small.

Description

Technical Field

[0001] The present invention relates to the field of motors, and particularly to a motor with composite heat dissipation. Background Art

[0002] In recent years, with the miniaturization of the volume of various machines and the pursuit of greater power and higher efficiency, as the core power component of most machines, the motor needs to have higher power density, smaller size and higher integration. Especially in applications such as robot joints, underwater propulsion and unmanned aerial vehicles, there are relatively high requirements for the overall volume of the motor. Moreover, high-power density motors will generate higher iron losses, copper losses and wind friction losses, etc. These losses will cause the temperature of the motor to rise. When the motor temperature exceeds the maximum operating temperature, the motor will be damaged.

[0003] The cooling of existing motors generally adopts natural air cooling, liquid cooling and oil cooling methods. Natural air cooling does not apply any additional heat dissipation measures to the motor, and only conducts the heat of the motor to the external environment through the structure of the motor itself. This cooling method is relatively slow and increasingly difficult to meet the development requirements of high-power density motors. The current liquid cooling and oil cooling methods require the series connection of external cooling devices and external power sources, but their volumes are relatively large, which does not conform to the development trend of the motor towards miniaturization, high integration and high power density. Therefore, it is necessary to design a highly integrated motor with a composite heat dissipation structure without an external power source. Summary of the Invention

[0004] In view of the problems in the related art, the present invention proposes a cooling structure and a motor for enhancing the heat dissipation of the internal space.

[0005] The present invention is realized by adopting the following technical solutions:

[0006] A composite heat dissipation motor according to the present invention includes a housing and a motor body disposed inside the housing. Defining one direction along the axial direction of the motor body as the forward direction and the other direction as the backward direction, the motor body includes a stator and a rotor. The stator is fixedly provided on the inner wall of the housing through a stator frame. The stator winding is potted with insulating glue inside the stator, and the stator winding has a wiring terminal; the rotor is rotatably disposed in the stator, and there is a rotation gap between the rotor and the stator;

[0007] The inside of the housing is provided with a circulating liquid cooling structure and an axial air cooling structure;

[0008] The described circulating liquid cooling structure includes a coolant circulation channel, which is a closed structure and includes a first circulating liquid channel, a second circulating liquid channel, and a cooling chamber that communicate with each other. The first circulating liquid channel axially penetrates the stator winding of the stator and is respectively connected to the second circulating liquid channel and the cooling chamber. The cooling chamber is arranged in the space between the rotor and the housing. A centrifugal pump is provided in the cooling chamber. The centrifugal pump is rotatably arranged in the cooling chamber and is power-connected to the rotor through a magnetic gear transmission mechanism for realizing power transmission between the rotor and the centrifugal pump.

[0009] The described axial air cooling structure includes shaftless fan blades and a first axial air duct and a second axial air duct that communicate with each other. Several shaftless fan blades are arranged at intervals on the inner wall surface of the rotor. The first axial air duct communicates the inner and outer cavities of the housing. The second axial air duct communicates the inner and outer cavities of the rotor for discharging the heat in the rotor and the housing along the axial direction of the motor body.

[0010] Preferably, the rotor includes a motor shaft and a rotor core sleeved outside the motor shaft.

[0011] The motor shaft is rotatably penetrated through the housing by a first rotating bearing, and a positioning section is provided on the motor shaft.

[0012] The rotor core is sleeved outside the motor shaft. The front end of the rotor core is connected to a positioning member, and the rear end is connected to the positioning section. Several shaftless fan blades are arranged at intervals along the circumferential direction on the inner wall of the rotor core.

[0013] A shaft through hole is provided on the positioning section, and a positioning member through hole is provided on the positioning member. The shaft through hole and the positioning member through hole form the second axial air duct.

[0014] Preferably, the magnetic gear transmission mechanism includes a high-speed permanent magnet, a magnetic gear low-speed core, a low-speed permanent magnet, and a magnetic gear modulation ring. The high-speed permanent magnet is arranged on the front end face of the positioning member. The magnetic gear low-speed core is arranged behind the centrifugal pump and is connected to the input part of the centrifugal pump. A low-speed permanent magnet is provided at the rear end of the magnetic gear low-speed core, and a magnetic gear modulation ring is provided on the rear wall of the cooling chamber. The low-speed permanent magnet and the high-speed permanent magnet attract each other for realizing power transmission between the rotor and the centrifugal pump.

[0015] Preferably, the coolant circulation channel includes a first circulating liquid channel, a cooling chamber, a second circulating liquid channel, and an embedded magnetic gear magnetic conduction ring. The first circulating liquid channel axially penetrates through the stator winding along the axial direction of the motor body. The second circulating liquid channel is embedded in the housing and is respectively connected to the first circulating liquid channel and the cooling chamber. Sealing materials are fixedly pasted at each connection of the coolant circulation channel.

[0016] Preferably, the housing includes a machine shell, a front end cover, and a rear end cover. The machine shell is a cylindrical structure with openings at both ends. The machine shell is provided with several second circulating liquid channel grooves arranged along the axial direction of the machine shell in the circumferential direction, and a second circulating liquid channel is embedded in the second circulating liquid channel grooves; the front end cover and the rear end cover are respectively installed at the front and rear openings of the machine shell. The front end cover is provided with several front end cover through holes at intervals along its circumferential direction, and the rear end cover is provided with several rear end cover through holes at intervals along its circumferential direction. The front end cover through holes and the rear end cover through holes form a first axial air duct.

[0017] Preferably, the centrifugal pump and the low-speed end iron core of the magnetic gear are fixedly connected to the second rotating bearing, and the second rotating bearing is sleeved on the motor rotating shaft in a rotatable manner; a low-speed end permanent magnet is provided at the rear side of the low-speed end iron core of the magnetic gear, and the low-speed end permanent magnet attracts the high-speed end permanent magnet.

[0018] Preferably, a high-speed end permanent magnet is provided on the front end face of the positioning member, which forms a complete magnetic gear transmission system together with the magnetic gear modulation ring, the low-speed end permanent magnet, and the low-speed end iron core of the magnetic gear.

[0019] Preferably, several first circulating liquid channel adaptation slots are arranged at intervals along the circumferential direction of the inner wall of the stator winding, and a first circulating liquid channel is embedded in the corresponding first circulating liquid channel adaptation slots.

[0020] The working principle of the present invention is as follows: The main cooling structure in the present invention is a circulating liquid cooling structure composed of a coolant circulation channel, a magnetic gear transmission mechanism, and a centrifugal pump; the auxiliary heat dissipation structure is an axial air cooling structure composed of a shaftless fan blade, a first axial air duct, and a second axial air duct.

[0021] In the circulating liquid cooling structure, the magnetic gear transmission mechanism transmits the driving force output by the rotor to the centrifugal pump body in the cooling chamber, drives the centrifugal pump to operate, pumps the coolant in the cooling chamber into the second circulating liquid channel, and the coolant flows through the second circulating liquid channel to the first circulating liquid channel and then flows back to the cooling chamber, completing the circulation of the coolant inside the motor body, thereby strengthening the heat exchange between the stator winding and the external environment of the motor and inside the housing; and making the temperature distribution of the stator and the housing more uniform, increasing the heat transferred from the housing to the environment, effectively reducing the temperature of the stator winding, and improving the load-bearing capacity and peak output capacity of the motor.

[0022] In the axial air-cooling structure, when the rotor rotates, the shaftless fan blades inside the rotor core cause gas flow. The gas flows from the through-holes in the rear end cover to the inner cavity of the axially hollow housing, and then flows out through the through-holes in the front end cover. During this air flow process, the convective heat dissipation capacity of the components on the air flow path is enhanced. The components on the path include the cooling chamber, the first circulating liquid channel, part of the second circulating liquid channel, the rotor core, the front end cover, and the rear end cover. It particularly assists in the heat dissipation of the coolant circulation channel of the main cooling structure, improves the heat dissipation capacity of the coolant circulation channel, reduces the temperature of the high-speed end permanent magnet, reduces the demagnetization of the high-speed end permanent magnet, and reduces the current required to be passed through the stator winding under load.

[0023] The beneficial effects of the present invention are as follows:

[0024] 1. Strengthen the heat exchange between the stator winding and the external environment of the motor and the inside of the housing; and make the temperature distribution of the stator and the housing more uniform, improve the heat transferred from the housing to the environment, effectively reduce the temperature of the stator winding, and improve the load-bearing capacity and peak output capacity of the motor;

[0025] 2. Integrate the circulating liquid cooling structure and the axial air-cooling structure inside the motor. The power sources of the main cooling mechanism and the auxiliary cooling structure are both the motor itself, without an external power source, occupying a small space, being convenient for installation, and meeting the development requirements of motor compactification.

[0026] 3. After the water channels are fixed in position, pour heat-conducting material into the motor stator, which can further strengthen the heat exchange between the stator winding, the stator core, and the coolant circulation channel. Description of the Drawings

[0027] Figure 1 It is a structural diagram of a motor according to an embodiment of the present invention.

[0028] Figure 2 It is Figure 1 the E-E cross-sectional view of

[0029] Figure 3 It is a schematic diagram of the position of the coolant circulation channel according to an embodiment of the present invention.

[0030] Figure 4 It is Figure 3 the A-A cross-sectional view of

[0031] Figure 5 It is a schematic diagram of a motor stator according to an embodiment of the present invention.

[0032] Figure 6 It is the front view of a motor stator according to an embodiment of the present invention.

[0033] Figure 7 It is a structural schematic diagram of a rotor according to an embodiment of the present invention.

[0034] Figure 8 For Figure 7 sectional view taken along line B-B.

[0035] Figure 9 Schematic diagram of the motor housing according to an embodiment of the present invention.

[0036] Figure 10 Front view of the motor housing according to an embodiment of the present invention.

[0037] Reference numerals:

[0038] Housing 1; motor body 2; stator 3; rotor 4; coolant circulation channel 110; first circulation liquid channel 111; second circulation liquid channel 112; cooling chamber 113; magnetic gear modulation ring 114; connection part 115; low-speed end iron core 120; low-speed end permanent magnet 121; centrifugal pump 130; second rotating bearing 140; connecting screw 150; casing 210; second circulation liquid channel groove 211; front end cover 220; front and rear end cover through holes 221; rear end cover 230; stator iron core 310; stator winding 320; potting insulating glue 330; stator fixing bracket 340; first water channel adapter groove 350; motor shaft 410; shaft through hole 411; positioning section 412; rotor iron core 420; shaftless fan blade 421; positioning part 440; high-speed end permanent magnet 441; positioning part through hole 442. Detailed Description of the Invention

[0039] The following will describe in detail the specific embodiments of the embodiments of the present invention with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only for the purpose of illustrating and explaining the embodiments of the present invention, and are not intended to limit the embodiments of the present invention.

[0040] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0041] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.

[0042] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0043] In the present invention, unless otherwise clearly specified and defined, terms such as "mounted", "connected", "coupled", "fixed", etc. shall be construed in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or communicable with each other; it may be directly connected, or indirectly connected through an intermediate medium, and may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] In the present invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0045] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0046] The present invention will be described in detail below with reference to the drawings and in conjunction with exemplary embodiments.

[0047] In order to enhance the heat dissipation capacity of the motor, reduce the winding temperature, and ensure the stable output and structural compactness of the motor, an embodiment of the present invention provides a compound heat dissipation motor. As Figure 1As shown in the figure, a composite heat dissipation motor according to the present invention includes a housing 1 and a motor body 2 disposed inside the housing 1. One direction along the axial direction of the motor body 2 is defined as the forward direction, and the other direction is defined as the backward direction. The motor body 2 includes a stator 3 and a rotor 4. The stator 3 is fixedly provided on the inner wall of the housing 1 through a stator bracket 340. The stator winding 320 is potted in the stator core of the stator 3 with an insulating glue 330, and the stator winding 320 has a terminal. The rotor 4 is rotatably disposed in the stator 3, and there is a rotational gap between the rotor 4 and the stator 3.

[0048] A circulating liquid cooling structure and an axial air cooling structure are provided inside the housing 1.

[0049] The circulating liquid cooling structure includes a coolant circulation channel 110. The coolant circulation channel 110 is a closed structure, including a first circulating liquid channel 111, a second circulating liquid channel 112, and a cooling chamber 113 that are connected to each other. The first circulating liquid channel 111 axially penetrates the stator winding 320 of the stator 3 and is respectively connected to the second circulating liquid channel 112 and the cooling chamber 113. The cooling chamber 113 is disposed in the space between the rotor and the housing 1. A centrifugal pump 130 is provided in the cooling chamber 113. The centrifugal pump 130 is rotatably disposed in the cooling chamber 113. The centrifugal pump 130 is power-connected to the rotor 4 through a magnetic gear transmission mechanism for realizing power transmission between the rotor 4 and the centrifugal pump 130.

[0050] The axial air cooling structure includes a shaftless fan blade 421 and a first axial air duct and a second axial air duct that are connected to each other. Several shaftless fan blades 421 are spaced apart and disposed on the inner wall surface of the rotor 4. The first axial air duct communicates with the inner and outer cavities of the housing 1. The second axial air duct communicates with the inner and outer cavities of the rotor 4 for discharging the heat inside the rotor 4 and the housing 1 along the axial direction of the motor body 2.

[0051] In some embodiments of the present invention, the cooling chamber 113 can be a chamber surrounded by several sealing covers. The chamber end cover is installed after the centrifugal pump 130 is installed in the cooling chamber 113 and is positioned and fixed by the rear end cover 230, and there is a sealing component at the connection. The first circulating liquid channel 111, the second circulating liquid channel 112, and the cooling chamber 113 form a closed and connected coolant circulation channel 110, and the coolant flows in the coolant circulation channel 110.

[0052] As Figure 7 shown, the rotor 4 includes a motor shaft 410 and a rotor core 420 sleeved outside the motor shaft 410.

[0053] The motor shaft 410 is rotatably disposed in the housing 1 through a first rotating bearing. The first rotating bearing is in interference fit with the housing 1. A positioning section 412 is provided on the motor shaft 410.

[0054] The rotor core 420 is sleeved outside the motor shaft 410. The front end of the rotor core 420 is connected to the positioning member 440, and the rear end is connected to the positioning section 412. A plurality of shaftless fan blades 421 are circumferentially spaced along the inner wall of the rotor core 420 for enhancing the gas convection inside the motor.

[0055] A shaft through hole 411 is provided on the positioning section 412, and a positioning member through hole 442 is provided on the positioning member 440. The shaft through hole 411 and the positioning member through hole 442 form a second axial air passage.

[0056] Preferably, the magnetic gear transmission mechanism includes a high-speed end permanent magnet 441, a magnetic gear low-speed end core 120, a low-speed end permanent magnet 121, and a magnetic gear modulation ring 114. The high-speed end permanent magnet 441 is disposed on the front end face of the positioning member 440; the magnetic gear low-speed end core 120 is disposed behind the centrifugal pump 130 and is connected to the input part of the centrifugal pump 130. A low-speed end permanent magnet 121 is provided at the rear end of the magnetic gear low-speed end core 120, and the magnetic gear modulation ring 114 is embedded in the rear wall of the cooling chamber 113; the low-speed end permanent magnet 121 and the high-speed end permanent magnet 441 attract each other to realize the power transmission between the rotor 4 and the centrifugal pump 130. When the rotor 4 rotates, it drives the motor shaft 410 and the positioning member 440 to rotate. The rotation of the positioning member 440 drives the low-speed end permanent magnet 121 in the cooling chamber 113 to rotate, causing the centrifugal pump 130 to rotate, thereby pumping the coolant in the cooling chamber 113 into the second circulating liquid passage 112. The coolant flows through the second circulating liquid passage 112 to the first circulating liquid passage 111 and then to the cooling chamber 113 to complete the coolant circulation; shaftless fan blades 421 are provided inside the rotor core 420, front end cover through holes 221 are circumferentially spaced along the front end cover 220 itself, and rear end cover through holes 231 are circumferentially spaced along the rear end cover 230 itself, connecting the inside of the motor to the external environment so that axial gas flow can be generated inside the motor when the motor shaft 410 rotates. Under the action of the rotation of the rotor 4, an air flow along the motor shaft 410 is generated, and external gas flows through the rear end cover through hole 231, the gap between the positioning member 440 and the motor shaft 410, the shaft through hole 411, and the front end cover through hole 221, strengthening the convective heat dissipation capacity of the coolant circulation passage 110, the motor body 2, and the housing 1 on this path.

[0057] In some embodiments of the present invention, the shaftless fan blades (i.e., shaftless rim fan blades) can be designed as a multi-layer fan blade structure according to the increase in the motor length, further strengthening the gas flow velocity inside the motor and enhancing the convective heat dissipation coefficient of the overall components.

[0058] In some embodiments of the present invention, the coolant circulation channel 110 includes a first circulation liquid channel 111, a cooling chamber 113, a second circulation liquid channel 112, and an embedded magnetic gear magnetic conduction ring; the first circulation liquid channel 111 axially penetrates through the stator winding 320 along the axis of the motor body 2, and the second circulation liquid channel is embedded in the housing 1 and is respectively communicated with the first circulation liquid channel 111 and the cooling chamber 113. The coolant circulation channel 110 is composed of multiple segments, and a sealing material is fixedly pasted at each connection 115. The shape of the coolant circulation channel is not limited to the shape formed in the embodiment, and the chamber can be larger to contact the potting resin, which can further enhance the heat exchange between the water channel and the motor stator components; the cooling water channel can also extend to the through holes of the front and rear end covers to further enhance the convective heat dissipation capacity of the cooling water channel.

[0059] In some embodiments of the present invention, a plurality of first circulation liquid channel adaptation slots 350 are provided at intervals along the circumferential direction of the inner wall of the stator winding 320. The potting resin for enhancing the heat transfer of the winding 320 is arranged around the first circulation liquid channel adaptation slots 350; the first circulation liquid channel 111 is embedded in the corresponding first circulation liquid channel adaptation slots 350 along the direction parallel to the axis of the motor body. The number of slots of the first circulation liquid channel 111 is the same as that of the stator core of the stator 3. The first circulation liquid channel 111 can be embedded in the stator winding 320 to absorb the heat generated by the copper loss of the stator winding 320; a centrifugal pump 130 is installed in the cooling chamber 113 for pumping the cooling liquid in the cooling chamber 113 into the second circulation liquid channel 112; the second circulation liquid channel 112 can be an independent component or can be directly embedded in the housing 210, and the cooling liquid flows through the second circulation liquid channel 112 to complete the heat exchange with the external environment.

[0060] In some embodiments of the present invention, the housing 1 includes a housing 210, a front end cover 220, and a rear end cover 230. The housing 210 is a cylindrical structure with openings at both ends. A plurality of second circulation liquid channel grooves 211 arranged along the axis of the housing 210 are provided along the circumferential direction of the housing 210. The second circulation liquid channel 112 is embedded in the second circulation liquid channel grooves 211. The front end cover 220 and the rear end cover 230 are respectively installed at the front and rear openings of the housing 210. A plurality of front end cover through holes 221 are provided at intervals along the circumferential direction of the front end cover 220, and a plurality of rear end cover through holes 231 are provided at intervals along the circumferential direction of the rear end cover 230. The front end cover through holes 221 and the rear end cover through holes 231 form a first axial air duct. There are screw holes at both ends of the housing 210 for connecting the front and rear end covers.

[0061] As Figure 2 shown, the stator core is installed in the housing 1 and is fixed and positioned by the positioning screws of the through holes on the housing 210 and the positioning protrusions of the housing. The installation position needs to consider the installation position of the cooling water channel, that is, the first water channel adaptation slot 350 and the second circulation liquid channel groove 211 of the housing 210 are centered and parallel.

[0062] In this embodiment, the first circulating liquid channel 111 can be embedded in the stator winding 320, and the second circulating liquid channel 112 is directly manufactured inside the housing 210. The second circulating liquid channel 112 is directly manufactured inside the housing 210, reducing the number of parts and the complexity of installation. Moreover, the coolant circulation channel 110 optimizes the water path, increases the contact area with the environment and the passability of the coolant. In addition, each component of the channel can be positioned and fixed through the motor and the housing, reducing mechanical connections. The gap between the part of the coolant circulation channel 110 in contact with the housing 1 is filled with a heat-conducting material (such as heat-conducting silicone grease, resin, etc.) to achieve heat exchange between the coolant circulation channel 110 and the housing 1.

[0063] In this embodiment, the rotor core 420 and the shaftless fan blade 421 are integrally and modularly manufactured, reducing the manufacturing cost and the manufacturing difficulty.

[0064] In some embodiments of the present invention, the centrifugal pump 130 and the low-speed end iron core 120 of the magnetic gear are fixedly connected to the second rotating bearing 140 by screws 150. Both the centrifugal pump 130 and the low-speed end iron core 120 have L-shaped positioning and can be stably installed on the second rotating bearing 140 under the connection of the screws 150; the second rotating bearing 140 is sleeved on the motor shaft 410 passing through the cooling chamber 113 in a rotating manner; a low-speed end permanent magnet 121 is provided at the rear side of the low-speed end iron core 120 of the magnetic gear, and the low-speed end permanent magnet 121 attracts the high-speed end permanent magnet 441, so that the centrifugal pump 130 can be driven by the motor shaft. The power of the centrifugal pump 130 comes from the motor rotor. The magnetic gear transmission mechanism composed of the high-speed end permanent magnet 441 on the positioning member 440, the magnetic gear modulation ring 114 on the cooling chamber 113, the low-speed end permanent magnet 121 on the centrifugal pump 130 and the low-speed end iron core 120 of the magnetic gear transmits the power of the motor rotor 4 to the centrifugal pump 130; driving the centrifugal pump 130 to pump the cooling liquid in the cooling chamber 113 into the second circulating liquid channel 112 to complete the circulation of the cooling liquid in the cooling water channel.

[0065] In some embodiments of the present invention, a high-speed end permanent magnet 441 is provided on the front end face of the positioning member 440, which forms a complete magnetic gear transmission system with the magnetic gear modulation ring 114, the low-speed end permanent magnet 121 and the low-speed end iron core 120 of the magnetic gear.

[0066] In some embodiments of the present invention, the end face of the rotor core 420 has relative mounting holes for connecting the motor shaft 410 and positioning. A hollow shaft through hole 411 is machined on the positioning section 412 of the motor shaft 410 for positioning the rotor core 420. The position of the shaft through hole 411 is partially misaligned with the position of the shaftless fan 421, and the misalignment angle is calculated from the common rotational speed of the motor; there are screw holes on the non-hollowed part of the positioning section 412 for mounting and positioning the rotor core 420.

[0067] In some embodiments of the present invention, the positioning member 440 is provided with fixing through holes corresponding to the mounting holes of the rotor core 420 and the screw holes of the motor shaft, and the positioning member 440 is designed with protruding ribs for positioning to cooperate with the motor shaft 410 to mount and position the rotor core 420. The positioning member 440 is provided with a positioning member through hole 442.

[0068] The working principle of the present invention is: the main cooling structure in the present invention is a circulating liquid cooling structure composed of a coolant circulation channel 110, a magnetic gear transmission mechanism and a centrifugal pump 130; the auxiliary heat dissipation structure is an axial air-cooling structure composed of a shaftless fan 421, a first axial air duct and a second axial air duct.

[0069] In the circulating liquid cooling structure, the magnetic gear transmission mechanism transmits the driving force output by the rotor to the centrifugal pump 130 in the cooling chamber 113, driving the centrifugal pump 130 to operate, pumping the coolant in the cooling chamber 113 into the second circulation liquid channel 112. The coolant flows through the second circulation liquid channel 112 to the first circulation liquid channel 111 and then to the cooling chamber 113, completing the circulation of the coolant inside the motor body 2, thereby strengthening the heat exchange between the stator winding 320 and the external environment of the motor and the inside of the housing 1; and making the temperature distribution of the stator 3 and the housing 1 more uniform, improving the heat transferred from the housing 1 to the environment, effectively reducing the temperature of the stator winding 320, and improving the load-carrying capacity and peak output capacity of the motor.

[0070] In the axial air-cooling structure, when the rotor 4 rotates, the shaftless fan 421 inside the rotor core 420 causes gas flow. The gas flows from the rear end cover through hole 231 to the inner cavity of the axially hollow housing 1 and then flows out from the front end cover through hole 221; during this air flow process, the convective heat dissipation capacity of the components on the air flow path is strengthened. The components on the path include the cooling chamber 113, the first circulation liquid channel 111, part of the second circulation liquid channel 112, the rotor core 420, the front end cover 220 and the rear end cover 230; especially assisting the heat dissipation of the coolant circulation channel of the main cooling structure, improving the heat dissipation capacity of the coolant circulation channel; and reducing the temperature of the high-speed end permanent magnet 441, reducing the demagnetization of the high-speed end permanent magnet 441, and reducing the current required to be passed through the stator winding under load.

[0071] In this embodiment, the operation process is generally as follows:

[0072] The motor runs, and the motor rotor core 420 rotates, driving the shaftless fan blade 421 and the high-speed end permanent magnet 441 to rotate. Among them, the high-speed end permanent magnet 441 drives the low-speed end permanent magnet 121 in the cooling chamber 113 to rotate, and then drives the centrifugal pump 130 to rotate. The centrifugal pump 130 pumps the cooling liquid in the cooling chamber 113 into the second circulating liquid channel 112, and pumps the cooling liquid in the first circulating liquid channel 111 into the cooling chamber 113, completing the circulation of the cooling liquid, taking away the heat of the stator winding 320, transferring the heat to the housing 1 and the external environment, and reducing the temperature rise of the stator 3. The auxiliary heat dissipation structure is air-cooled heat dissipation. The shaftless fan blade 421 causes the internal air flow to flow. Since the shaft through hole 411, the positioning member through hole 442, the front end cover through hole 221, and the rear end cover through hole 231 form an axial air flow channel, the generated gas flow can enhance the convective heat dissipation capacity of the internal space components, reduce the temperature rise of the internal components, and can also enhance the convective heat dissipation coefficient of the cooling water channel on the gas flow path, further reducing the temperature rise of the motor stator.

[0073] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A compound heat dissipation motor, comprising a housing (1) and a motor body (2) disposed within the housing (1). Defining one direction along the axial direction of the motor body (2) as the forward direction and the other direction as the backward direction, the motor body (2) includes a stator (3) and a rotor (4). The stator (3) is fixedly disposed on the inner wall of the housing (1). The stator winding (320) is encapsulated with an insulating glue (330) inside the stator core 310 of the stator (3), and the stator winding (320) has a terminal; the insulating glue is a heat-conducting material; the rotor (4) is rotatably disposed through the stator (3), and there is a rotational gap between the rotor (4) and the stator (3), characterized in that: A circulating liquid cooling structure and an axial air cooling structure are provided inside the housing (1); The circulating liquid cooling structure includes a coolant circulation channel (110). The coolant circulation channel (110) is a closed structure, including a first circulating liquid channel (111), a second circulating liquid channel (112), and a cooling chamber (113) that are connected to each other. The first circulating liquid channel (111) axially penetrates the stator winding (320) of the stator (3) and is respectively connected to the second circulating liquid channel (112) and the cooling chamber (113); the cooling chamber (113) is disposed in the space between the rotor and the housing (1); a centrifugal pump (130) is provided in the cooling chamber (113). The centrifugal pump (130) is rotatably disposed in the cooling chamber (113). The centrifugal pump (130) is power-connected to the rotor (4) through a magnetic gear transmission mechanism for realizing power transmission between the rotor (4) and the centrifugal pump (130); The axial air cooling structure includes shaftless fan blades (421) and a connected first axial air duct and a second axial air duct. Several shaftless fan blades (421) are spaced apart and disposed on the inner wall surface of the rotor (4); the first axial air duct communicates with the inner and outer cavities of the housing (1); the second axial air duct communicates with the inner and outer cavities of the rotor (4) for discharging the heat inside the rotor (4) and the housing (1) along the axial direction of the motor body (2); The magnetic gear transmission mechanism includes a high-speed end permanent magnet (441), a magnetic gear low-speed end iron core (120), a low-speed end permanent magnet (121), and a magnetic gear modulation ring (114). The high-speed end permanent magnet (441) is disposed on the front end surface of the positioning member (440); the magnetic gear low-speed end iron core (120) is disposed behind the centrifugal pump (130) and is connected to the input part of the centrifugal pump (130). The rear end of the magnetic gear low-speed end iron core (120) is provided with a low-speed end permanent magnet (121), and the rear wall of the cooling chamber (113) is provided with a magnetic gear modulation ring (114); the low-speed end permanent magnet (121) and the high-speed end permanent magnet (441) attract each other; The described coolant circulation channel (110) consists of a first circulating liquid channel (111), a cooling chamber (113), a second circulating liquid channel (112), and an embedded magnetic gear magnetic conduction ring; the first circulating liquid channel (111) axially penetrates through the stator winding (320) along the axis of the motor body (2), the second circulating liquid channel is embedded in the housing (1) and is respectively communicated with the first circulating liquid channel (111) and the cooling chamber (113), and sealing materials are fixedly pasted at each connection (115) of the coolant circulation channel (110).

2. The compound heat dissipation motor according to claim 1, characterized in that: The described rotor (4) includes a motor shaft (410) and a rotor core (420) sleeved outside the motor shaft (410); The motor shaft (410) is rotatably penetrated through the housing (1) by a first rotating bearing, and a positioning section (412) is provided on the motor shaft (410); The rotor core (420) is sleeved outside the motor shaft (410), the front end of the rotor core (420) is connected to a positioning member (440), the rear end is connected to the positioning section (412), and several shaftless fan blades (421) are provided at intervals along the circumferential direction on the inner wall of the rotor core (420); A shaft through hole (411) is provided on the positioning section (412), a positioning member through hole (442) is provided on the positioning member (440), and the shaft through hole (411) and the positioning member through hole (442) form a second axial air duct.

3. The compound heat dissipation motor according to claim 1, characterized in that: The described housing (1) includes a machine shell (210), a front end cover (220), and a rear end cover (230). The machine shell (210) is a cylindrical structure with openings at both ends. The machine shell (210) is provided with several second circulating liquid channel grooves (211) arranged along the axial direction of the machine shell (210) along the circumferential direction, and the second circulating liquid channel (112) is embedded in the second circulating liquid channel grooves (211); the front end cover (220) and the rear end cover (230) are respectively installed at the front and rear openings of the machine shell (210). The front end cover (220) is provided with a number of front end cover through holes (221) at intervals along its circumferential direction, and the rear end cover (230) is provided with a number of rear end cover through holes (231) at intervals along its circumferential direction. The front end cover through holes (221) and the rear end cover through holes (231) form a first axial air duct.

4. A composite heat dissipation motor as claimed in claim 1, wherein: The centrifugal pump (130) and the magnetic gear low-speed end iron core (120) are fixedly connected to the second rotating bearing (140) by connecting screws (150), and the second rotating bearing (140) is sleeved on the motor shaft (410) in a rotatable manner; a low-speed end permanent magnet (121) is provided at the rear side of the magnetic gear low-speed end iron core (120), and the low-speed end permanent magnet (121) attracts the high-speed end permanent magnet (441).

5. A composite heat dissipation motor according to claim 1, characterized in that: A high-speed end permanent magnet (441) is provided on the front end face of the positioning member (440), which together with the magnetic gear modulation ring (114), the low-speed end permanent magnet (121), and the magnetic gear low-speed end iron core (120) forms a complete magnetic gear transmission system.

6. A composite heat dissipation motor according to claim 1, characterized in that: A number of first circulating liquid channel adaptation through grooves (350) are provided at intervals along the circumferential direction on the inner wall of the described stator winding (320), and the first circulating liquid channel (111) is embedded in the corresponding first circulating liquid channel adaptation through grooves (350).

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