A single-toothed external rotor motor cooling device

Abstract

The application discloses a single-tooth spliced outer rotor motor cooling device, which comprises a casing assembly, a stator assembly and a water cooling flow channel. The stator core of the stator assembly comprises a stator yoke arranged in a positioning groove and a plurality of stator teeth respectively detachably connected to the outer circumferential side of the stator yoke. The stator teeth are positioned and connected with the front limiting table and the rear limiting table through positioning shafts. The middle flow channel of the water cooling flow channel comprises a plurality of connecting flow channels which are respectively connected with a front backflow channel and a rear backflow channel. The positioning shafts are hollow structures to form part of the connecting flow channels. The outer circumferential side of the front end of the positioning shaft is sealingly connected with the front limiting table, and the outer circumferential side of the rear end is sealingly connected with the rear limiting table. The single-tooth spliced outer rotor motor cooling device not only facilitates the replacement of the stator teeth individually, reduces the maintenance cost, but also avoids the risk of contact between the cooling liquid and the stator core or the motor winding, prolongs the service life of the motor.

Description

Technical Field

[0001] This invention relates to the field of external rotor motors, and more particularly to a cooling device for a single-tooth external rotor motor. Background Technology

[0002] The single-tooth external rotor motor can individually wind coils on each stator tooth and then splice them onto the stator yoke. The winding process is simple, which makes the winding equipment design simple, the winding speed fast, improves the winding efficiency, and reduces the cost of the winding equipment.

[0003] Existing single-tooth external rotor motors, such as the utility model patent titled "Water-cooled External Rotor Flat Wire Winding Motor" (CN222884415U), have teeth connected to the yoke by welding or glue, making individual tooth repair or replacement inconvenient and resulting in high maintenance costs. Furthermore, their water-cooling system includes an input port, a shunt assembly, a fluid tank, a winding sealing cavity, and an output port. This winding sealing cavity is located inside the stator assembly, with both the winding and teeth housed within it. During cooling, coolant flows through the winding sealing cavity to cool the winding and teeth. Since the coolant directly contacts the winding and teeth during flow, and coolant is typically water, a mixture of water and ethylene glycol, or an oily coolant, there is a risk of burning out the windings or corroding the windings and teeth, thus reducing motor performance. Summary of the Invention

[0004] This invention addresses the shortcomings of existing technologies by providing a cooling device for a single-tooth external rotor motor. This device not only facilitates the individual replacement of stator teeth, reducing maintenance costs, but also avoids the risks associated with coolant contact with the stator core or motor windings, thus extending the motor's service life.

[0005] The technical solution adopted in this invention is as follows:

[0006] A cooling device for a single-tooth external rotor motor includes a housing assembly, a stator assembly, and a water-cooling channel. The housing assembly has a positioning groove recessed along its outer periphery, a front limiting platform arranged at the front end of the positioning groove, and a rear limiting platform arranged at the rear end of the positioning groove. The stator assembly includes a stator core and a motor winding. The stator core includes a stator yoke sleeved in the positioning groove and several stator teeth detachably connected to the outer periphery of the stator yoke. The stator teeth are positioned and connected to the front and rear limiting platforms via positioning shafts. The motor winding includes several winding knots wound on each stator tooth. The water-cooled flow channel includes an inlet flow channel, an outlet flow channel, and an intermediate flow channel connecting the inlet flow channel and the outlet flow channel. The intermediate flow channel includes several front return flow channels located at the front end of the housing assembly, a rear return flow channel located at the rear end of the housing assembly, and connecting flow channels at both ends connected to a front return flow channel and a rear return flow channel, respectively. Adjacent front return flow channels are connected to the same rear return flow channel through at least one connecting flow channel. The positioning shaft is configured as a hollow structure to form part of the connecting flow channel, and the outer peripheral side of the front end of the positioning shaft is sealed to the front limiting platform, and the outer peripheral side of the rear end is sealed to the rear limiting platform.

[0007] Preferably, the stator gear has a through-hole, the front limiting platform has a front positioning channel corresponding to the front end of the positioning hole, the rear limiting platform has a rear positioning channel corresponding to the rear end of the positioning hole, the front end of the positioning shaft extends into the front positioning channel and is sealed to the front positioning channel by a front sealing ring sleeved between the outer periphery of the positioning shaft and the front positioning channel, and the rear end extends into the rear positioning channel and is sealed to the rear positioning channel by a rear sealing ring sleeved between the outer periphery of the positioning shaft and the rear positioning channel.

[0008] Preferably, the front positioning channel and the rear positioning channel are arranged in the front-rear direction, and the connecting flow channel includes a front longitudinal flow channel arranged in the front-rear direction and connected to the front return flow channel, a front cross flow channel connected to the front longitudinal flow channel and the front positioning channel, a rear longitudinal flow channel arranged in the front-rear direction and connected to the rear return flow channel, a rear cross flow channel connected to the rear longitudinal flow channel and the rear positioning channel, and a hollow channel disposed in the positioning shaft; the front longitudinal flow channels are spaced apart on the side of the front positioning channel near the central axis of the housing assembly, and the rear longitudinal flow channels are spaced apart on the side of the rear positioning channel near the central axis of the housing assembly; the front end of the hollow channel is connected to the front cross flow channel and the rear end is connected to the rear cross flow channel.

[0009] Preferably, the housing assembly includes a housing body, a front cover plate covering the front end of the housing body and fixed relative to the housing body, and a rear cover plate covering the rear end of the housing body and fixed relative to the housing body; the front end face of the housing body is recessed with a plurality of front return grooves, the front return grooves and the front cover plate surround to form the front return channel, the front positioning channel, the front crossflow channel and the front longitudinal flow channel are disposed on the housing body, and the front longitudinal flow channel is connected to the front return grooves; the rear end face of the housing body is recessed with a plurality of rear return grooves, the rear return grooves and the rear cover plate surround to form the rear return channel, the rear positioning channel, the rear crossflow channel and the rear longitudinal flow channel are disposed on the housing body, and the rear longitudinal flow channel is connected to the rear return grooves.

[0010] Preferably, the stator gear includes a gear connecting end detachably connected to the stator yoke and a gear winding end connected to the gear connecting end. The front end face of the gear connecting end and the front end face of the stator yoke abut against the front limiting platform, and the rear end face of the gear connecting end and the rear end face of the stator yoke abut against the rear limiting platform. The positioning hole is provided through the gear connecting end, and the winding structure is wound on the gear winding end. The gear connecting end is provided with a dovetail tenon structure, and the outer peripheral sidewall of the stator yoke is provided with a dovetail tenon groove structure. The stator gear and the stator yoke are mortised and tenoned together in the front-to-back direction through the dovetail tenon structure and the dovetail tenon groove structure.

[0011] Preferably, the stator yoke is positioned and connected to the front and rear limiting platforms via the positioning shafts, and two adjacent front return channels are respectively connected to the same rear return channel via at least two positioning shafts arranged on the stator gear and at least one positioning shaft arranged on the stator yoke.

[0012] Preferably, the gaps between the motor winding and the stator teeth and stator yoke, as well as the gaps inside the winding structure, are filled with potting compound.

[0013] Preferably, it also includes several heat dissipation plate structures arranged between two adjacent winding structures, and the gaps between the motor winding and the stator gear, stator yoke, and heat dissipation plate structure, as well as the gaps inside the winding structure, are filled with potting compound.

[0014] Preferably, the heat dissipation plate structure includes a first heat absorption plate and a second heat absorption plate vertically connected to one end of the first heat absorption plate. In two adjacent heat dissipation structures, the first heat absorption plate of one heat dissipation structure is arranged in the gap between two adjacent winding structures, and the second heat absorption plate covers the front end side of the two adjacent winding structures; in the other heat dissipation structure, the first heat absorption plate is arranged in the gap between two adjacent winding structures, and the second heat absorption plate covers the rear end side of the two adjacent winding structures.

[0015] Preferably, it also includes a rotor assembly, which includes a mounting frame sleeved on the outside of the stator core and rotating relative to the stator core, and a plurality of magnets respectively disposed on the inner circumferential sidewall of the mounting frame and arranged with gaps between them and the stator teeth.

[0016] The beneficial effects achieved by this invention are as follows:

[0017] The single-tooth external rotor motor cooling device provided by this invention allows for easy replacement of stator teeth by detachably connecting each stator tooth to the outer periphery of the stator yoke, reducing maintenance costs. Furthermore, the stator teeth are positioned and connected to the front and rear limit platforms of the housing assembly via a positioning shaft, improving the stability of the connection between the stator teeth and the stator yoke. This prevents vibration and displacement of the stator teeth during motor operation, thus avoiding impacts on the concentricity and operational accuracy of each stator tooth. In addition, the coolant flows in from the inlet channel of the water-cooling channel, exits through the intermediate channel, and flows sequentially through a rear return channel, a connecting channel, a front return channel, another connecting channel, and another rear return channel within the intermediate channel. The positioning shaft is designed as a hollow structure to form a partial connecting channel, thereby allowing the coolant flow to remove heat from both ends of the housing assembly and the stator teeth. Simultaneously, the motor windings... The dissipated heat can also be conducted to the coolant through the stator gears and positioning shaft, thereby cooling the housing assembly, stator gears, and motor windings. Furthermore, the water-cooling channel is located within the housing assembly and positioning shaft. The outer periphery of the front end of the positioning shaft is sealed to the front limit platform, and the outer periphery of the rear end is sealed to the rear limit platform. This isolates the coolant from the motor windings and stator core as it flows within the water-cooling channel, preventing coolant leakage into the stator gears or the gaps between the stator gears and the front and rear limit platforms, thus avoiding the risk of contact with the stator core or motor windings and extending the motor's lifespan. In addition, the positioning shaft serves as both a positioning connection structure between the stator gears and the front and rear limit platforms, and part of the water-cooling channel structure, offering multiple functions and reducing the space occupied by the water-cooling channel within the motor, thereby allowing for a smaller overall motor size.

[0018] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0019] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings:

[0020] Figure 1 This is a schematic diagram of the structure of a cooling device for a single-tooth external rotor motor according to an embodiment of the present invention.

[0021] Figure 2 This is a partial structural cross-sectional view of a cooling device for a single-tooth external rotor motor according to an embodiment of the present invention.

[0022] Figure 3 This is an exploded view of a cooling device for a single-tooth external rotor motor according to an embodiment of the present invention.

[0023] Figure 4 This is an exploded view of a housing assembly according to an embodiment of the present invention.

[0024] Figure 5 This is a schematic diagram of the structure of the cover according to an embodiment of the present invention.

[0025] Figure 6 This is a schematic diagram of the main body of an embodiment of the present invention.

[0026] Figure 7 This is an exploded view of the stator assembly and heat sink structure according to an embodiment of the present invention.

[0027] Figure 8 This is an exploded view of a stator assembly according to an embodiment of the present invention.

[0028] Figure 9 This is an exploded view of a stator core according to an embodiment of the present invention.

[0029] Figure 10 This is an exploded view of the stator yoke and stator gear according to an embodiment of the present invention.

[0030] Figure 11 This is a schematic diagram of a heat sink structure according to an embodiment of the present invention.

[0031] Figure label:

[0032] Housing assembly 1;

[0033] Front limiting platform 101, front positioning channel 1011, front sealing ring 1012, front sealing groove 1013; rear limiting platform 102, rear positioning channel 1021, rear sealing ring 1022, rear sealing groove 1023; positioning groove 103; front cover plate 11; rear cover plate 12; housing body 13; front return groove 1301, rear return groove 1302, assembly hole 1303, opening 1304, sealing head 1305, front sealing inner ring groove 1306, front sealing outer ring groove 1307, rear sealing inner ring groove 1308, rear sealing outer ring groove 1309; main body 131, side ring structure 1311, end ring structure 1312; cover 132; front sealing inner ring 14; front sealing outer ring 15; rear sealing inner ring 16; rear sealing outer ring 17.

[0034] Stator assembly 2;

[0035] Stator core 21; positioning hole 210; stator yoke 211, dovetail tenon structure 2111, yoke tooth structure 2112; stator tooth 212, tooth connection end 2121, tooth winding end 2122, dovetail tenon structure 2123; positioning shaft 213; motor winding 22; winding structure 221;

[0036] Water-cooled flow channel 3;

[0037] Inlet channel 31; outlet channel 32; intermediate channel 33; front return channel 331, rear return channel 332, connecting channel 333, front longitudinal flow channel 3331, front cross flow channel 3332, rear longitudinal flow channel 3333, rear cross flow channel 3334, hollow channel 3335;

[0038] Potting compound 4;

[0039] Heat sink structure 5;

[0040] First heat-absorbing plate 51; first heat-absorbing part 511, second heat-absorbing part 512; second heat-absorbing plate 52;

[0041] Rotor assembly 6;

[0042] Mounting bracket 61; Magnet sheet 62. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the described embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0044] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0045] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0046] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0047] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains. The terms “first,” “second,” and similar terms used in the specification and claims of this patent application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms “an” or “a” and similar terms do not indicate a limitation of quantity, but rather indicate the presence of at least one.

[0048] like Figures 1-11As shown in the figure, as an embodiment of the present invention, a cooling device for a single-tooth external rotor motor is provided, including a housing assembly 1, a stator assembly 2, and a water-cooling channel 3. The housing assembly 1 has a positioning groove 103 recessed along its outer periphery, a front limiting platform 101 arranged at the front end of the positioning groove 103, and a rear limiting platform 102 arranged at the rear end of the positioning groove 103. The stator assembly 2 includes a stator core 21 and a motor winding 22. The stator core 21 includes a stator yoke 211 sleeved in the positioning groove 103 and a plurality of stator teeth 212 detachably connected to the outer periphery of the stator yoke 211. The stator teeth 212 are positioned and connected to the front limiting platform 101 and the rear limiting platform 102 through a positioning shaft 213. The motor winding 22 includes a plurality of winding structures 221 respectively wound on each stator tooth 212. The water-cooled flow channel 3 includes an inlet flow channel 31, an outlet flow channel 32, and an intermediate flow channel 33 connecting the inlet flow channel 31 and the outlet flow channel 32. The intermediate flow channel 33 includes several front return flow channels 331 located at the front end of the housing assembly 1, a rear return flow channel 332 located at the rear end of the housing assembly 1, and connecting flow channels 333 whose two ends are respectively connected to a front return flow channel 331 and a rear return flow channel 332. Two adjacent front return flow channels 331 are respectively connected to the same rear return flow channel 332 through at least one connecting flow channel 333. The positioning shaft 213 is configured as a hollow structure to form part of the connecting flow channel 333, and the outer peripheral side of the front end of the positioning shaft 213 is sealed to the front limiting platform 101, and the outer peripheral side of the rear end is sealed to the rear limiting platform 102.In this embodiment of the single-tooth external rotor motor cooling device, since each stator tooth 212 is detachably connected to the outer periphery of the stator yoke 211, it is convenient to replace the stator tooth 212 individually, reducing maintenance costs. Furthermore, the stator tooth 212 is positioned and connected to the front limiting platform 101 and the rear limiting platform 102 of the housing assembly 1 via the positioning shaft 213, improving the stability of the connection between the stator tooth 212 and the stator yoke 211. This prevents vibration displacement of the stator tooth 212 during motor operation, thus avoiding any impact on the stability of each stator tooth 212. Concentricity and operational accuracy; furthermore, the coolant flows in from the inlet channel 31 of the water-cooled channel 3, flows out from the outlet channel 32 through the intermediate channel 33, and when the coolant flows in the intermediate channel 33, it can flow sequentially through a rear return channel 332, a connecting channel 333, a front return channel 331, another connecting channel 333, and another rear return channel 332. The positioning shaft 213 is set as a hollow structure to form part of the connecting channel 333, so that the heat from both ends of the housing assembly 1 and the stator gear 212 can be carried away by the flow of coolant. At the same time, the motor The heat dissipated by the winding 22 can also be conducted to the coolant through the stator gear 212 and the positioning shaft 213, thereby cooling the housing assembly 1, the stator gear 212, and the motor winding 22. Furthermore, the water-cooling channel 3 is located within the housing assembly 1 and the positioning shaft 213. The outer periphery of the front end of the positioning shaft 213 is sealed to the front limiting platform 101, and the outer periphery of the rear end is sealed to the rear limiting platform 102. This ensures that the coolant is isolated from the motor winding 22 and the stator core 21 when flowing within the water-cooling channel 3, preventing coolant leakage into the stator gear. The risk of leakage into the stator gear 212 or into the gap between the stator gear 212 and the front limit platform 101 and the rear limit platform 102, and contact with the stator core 21 or the motor winding 22, is reduced, thus extending the service life of the motor. In addition, the positioning shaft 213 serves as both a positioning connection structure between the stator gear 212 and the front limit platform 101 and the rear limit platform 102, and as part of the water cooling channel 3, achieving a multi-purpose effect. It also reduces the space occupied by the water cooling channel 3 inside the motor, thereby reducing the overall size design of the motor.

[0049] like Figure 2 , Figure 9 , Figure 10As shown, in some specific embodiments, the stator gear 212 is provided with a positioning hole 210. The front limiting platform 101 is provided with a front positioning channel 1011 corresponding to the front end of the positioning hole 210, and the rear limiting platform 102 is provided with a rear positioning channel 1021 corresponding to the rear end of the positioning hole 210. The front end of the positioning shaft 213 extends into the front positioning channel 1011 and is sealed to the front positioning channel 1011 by a front sealing ring 1012 sleeved between the outer periphery of the positioning shaft 213 and the front positioning channel 1011. The rear end extends into the rear positioning channel 1021 and is sealed to the rear positioning channel 1021 by a rear sealing ring 1022 sleeved between the outer periphery of the positioning shaft 213 and the rear positioning channel 1021. By having the positioning shaft 213 pass through the positioning hole 210, the front positioning channel 1011, and the rear positioning channel 1022, the stator gear 212 is positioned and connected relative to the housing assembly 1, facilitating precise assembly of the positioning shaft 213. The front sealing ring 1012 and the rear sealing ring 1022 are made of flexible materials such as soft silicone, which can improve the sealing effect. The inner circumferential sidewall of the front positioning channel 1011 is recessed with a front sealing groove 1013, and the inner circumferential sidewall of the rear positioning channel 1021 is recessed with a rear sealing groove 1023. The front sealing ring 1012 is axially limited and arranged in the front sealing groove 1013 and protrudes from the inner circumferential sidewall of the front positioning channel 1011. The rear sealing ring 1022 is axially limited and arranged in the rear sealing groove 1023 and protrudes from the inner circumferential sidewall of the rear positioning channel 1021. This makes it difficult for the front sealing ring 1012 and the rear sealing ring 1022 to move axially with the positioning shaft 213 relative to the housing assembly 1, which facilitates the assembly or disassembly of the positioning shaft 213.

[0050] like Figure 2As shown, in some specific embodiments, the front positioning channel 1011 and the rear positioning channel 1021 are arranged in the front-rear direction, and the connecting channel 333 includes a front longitudinal flow channel 3331 arranged in the front-rear direction and connected to the front return channel 331, a front cross flow channel 3332 connected to the front longitudinal flow channel 3331 and the front positioning channel 1011, a rear longitudinal flow channel 3333 arranged in the front-rear direction and connected to the rear return channel 332, a rear cross flow channel 3334 connected to the rear longitudinal flow channel 3333 and the rear positioning channel 1021, and a hollow channel 3335 disposed in the positioning shaft 213. The front longitudinal flow channel 3331 is arranged at intervals on one side of the front positioning channel 1011 near the central axis of the housing assembly 1, and the rear longitudinal flow channel 3333 is arranged at intervals on one side of the rear positioning channel 1021 near the central axis of the housing assembly 1. The front end of the hollow channel 3335 is connected to the front cross flow channel 3332, and the rear end is connected to the rear cross flow channel 3334. This allows the coolant to flow sequentially through a rear return channel 332, a rear longitudinal flow channel 3333, a rear cross flow channel 3334, a hollow channel 3335, a front cross flow channel 3332, a front longitudinal flow channel 3331, a front return channel 331, another front longitudinal flow channel 3331, another front cross flow channel 3332, another hollow channel 3335, another rear cross flow channel 3334, another rear longitudinal flow channel 3333, and another rear return channel 332, thereby cooling the housing assembly 1, stator gears 212, and motor windings 22.

[0051] like Figure 4As shown, in some specific embodiments, the housing assembly 1 includes a housing body 13, a front cover plate 11 covering the front end of the housing body 13 and fixed relative to the housing body 13, and a rear cover plate 12 covering the rear end of the housing body 13 and fixed relative to the housing body 13. The front end face of the housing body 13 is recessed with a plurality of front return channels 1301, which, together with the front cover plate 11, form the front return channel 331. A front positioning channel 1011, a front crossflow channel 3332, and a front longitudinal flow channel 3331 are disposed on the housing body 13, and the front longitudinal flow channel 3331 is connected to the front return channels 1301. The rear end face of the housing body 13 is recessed with a plurality of rear return grooves 1302. The rear return grooves 1302 and the rear cover plate 12 surround to form the rear return channel 332. The rear positioning channel 1021, the rear transverse flow channel 3334, and the rear longitudinal flow channel 3333 are provided on the housing body 13, and the rear longitudinal flow channel 3333 is connected to the rear return grooves 1302. In this embodiment, the front return channel 331 and the rear return channel 332 are respectively formed by the front and rear end faces of the housing body 13 and the front and rear cover plates. The front return channel 331 can be formed by covering the front return channel 1301 with the housing body 13, and the rear return channel 332 can be formed by covering the rear return channel 1302 with the housing body 13. This facilitates the processing of the front return channel 331, the rear return channel 332, the front longitudinal flow channel 3331, and the rear longitudinal flow channel 333.

[0052] like Figure 5 , Figure 6 As shown, in some specific embodiments, the housing body 13 includes a main body 131 and a cover 132 detachably connected to the main body 131. The main body 131 includes a side ring structure 1311 arranged on the inner periphery of the stator yoke 211 and an end ring structure 1312 connected to the rear end of the side ring structure 1311. The outer periphery of the end ring structure 1312 protrudes from the outer periphery of the side ring structure 1311 to form the rear limiting platform 102. The cover 132 is configured as a ring structure and is arranged at the front end of the side ring structure 1311. The outer periphery of the cover 132 protrudes from the outer periphery of the side ring structure 1311 to form the front limiting platform 101. The outer periphery of the side ring structure 1311, the end ring structure 1312, and the cover 132 surround to form the positioning groove 103, facilitating the stator core 21 to be fitted onto the side ring structure 1311 from the front end of the main body 131. The front return channel 1301, the front positioning channel 1011, the front longitudinal flow channel 3331, and the front cross flow channel 3332 are set on the cover body 132, and the rear return channel 1302, the rear positioning channel 1021, the rear longitudinal flow channel 3333, and the rear cross flow channel 3334 are set on the end ring structure 1312.

[0053] like Figure 2As shown, in some specific embodiments, the outer periphery of the cover 132 has a limiting ring that extends rearward and is limited to the outer periphery of the main body 131, the inner periphery of the front cover 11 has a limiting ring that extends rearward and is limited to the inner periphery of the cover 132, and the inner periphery of the rear cover 12 has a limiting ring that extends forward and is limited to the inner periphery of the main body 131, which facilitates the precise positioning and assembly of the housing assembly 1.

[0054] like Figure 2 As shown, in some specific embodiments, the positioning hole 210, the front positioning channel 1011, and the rear positioning channel 1021 are arranged along the same straight line. The front end of the housing body 13, i.e., the front end of the cover 132, is provided with an assembly hole 1303 for the positioning shaft 213 to pass through the front positioning channel 1011, the positioning hole 210, and the rear positioning channel 1021 in sequence, facilitating the assembly or disassembly of the positioning shaft 213. One end of the front crossflow channel 3332 and the rear crossflow channel 3334 is respectively provided with an opening 1304 penetrating the side wall of the housing body 13. The front longitudinal flow channel 3331, the front crossflow channel 3332, the rear longitudinal flow channel 3333, the rear crossflow channel 3334, the assembly hole 1303, and the opening 1304 are formed by drilling on the housing body 13. The opening 1304 facilitates the drilling of the front crossflow channel 3332 and the rear crossflow channel 3334. A sealing head 1305 is provided in the assembly hole 1303 and the opening 1304 respectively to prevent coolant from leaking from the assembly hole 1303 or the opening 1304 to the outside of the housing body 13.

[0055] like Figure 2 , Figure 5 , Figure 6As shown, in some specific embodiments, a front sealing inner ring 14, a front sealing outer ring 15, a rear sealing inner ring 16, and a rear sealing outer ring 17 are also included. The front sealing inner ring 14 is arranged inside each front return channel 331 and is sealed between the front end face of the housing body 13 (i.e., the front end face of the cover 132) and the front cover plate 11. The front sealing outer ring 15 is arranged outside each front return channel 331 and is sealed between the front end face of the housing body 13 (i.e., the front end face of the cover 132) and the front cover plate 11. The rear sealing inner ring 16 is arranged inside each rear return channel 332 and is sealed between the rear end face of the housing body 13 (i.e., the rear end face of the end ring structure 1312) and the rear cover plate 12. The rear sealing outer ring 17 is arranged outside each rear return channel 332 and is sealed between the rear end face of the housing body 13 (i.e., the rear end face of the end ring structure 1312) and the rear cover plate 12. The front cover plate 11 and the rear cover plate 12 are fastened together by screws or other fasteners arranged in the front-rear direction, so that the front sealing inner ring 14 and the front sealing outer ring 15 are interference-fitted between the front end face of the housing body 13 and the front cover plate 11 for sealing, and the rear sealing inner ring 16 and the rear sealing outer ring 17 are interference-fitted between the rear end face of the housing body 13 and the rear cover plate 12 for sealing. This improves the sealing performance of the front return channel 331 and the rear return channel 332, and prevents coolant from leaking out of the housing assembly 1 through the gap between the housing body 13 and the front cover plate 11 or the rear cover plate 12.

[0056] In some specific embodiments, the front end face of the housing body 13, i.e., the front end face of the cover 132, is recessed with a front sealing inner ring groove 1306 spaced apart inside each front return groove 1301, and a front sealing outer ring groove 1307 spaced apart outside each front return groove 1301. The rear end face of the housing body 13, i.e., the rear end face of the end ring structure 1312, is recessed with a rear sealing inner ring groove 1308 spaced apart inside each rear return groove 1302, and a rear sealing outer ring groove 1309 spaced apart outside each rear return groove 1302. The front sealing inner ring 14 is positioned within the front sealing inner ring groove 1306, the front sealing outer ring 15 is positioned within the front sealing outer ring groove 1307, the rear sealing inner ring 16 is positioned within the rear sealing inner ring groove 1308, and the rear sealing outer ring 17 is positioned within the rear sealing outer ring groove 1309 to prevent the sealing rings from vibrating and shifting during motor operation, thus affecting the sealing effect.

[0057] like Figure 1 , Figure 6 As shown, in some specific embodiments, the inlet channel 31 and the outlet channel 32 are arranged on the rear cover plate 12, respectively connected to the two rear return channels 332, and are arranged through the rear cover plate 12 in the front-to-back direction, so as to facilitate connection with external water source devices.

[0058] In some specific embodiments, the stator gear 212 includes a plurality of stator gear laminations stacked along its axial direction and fixedly connected to each other, and the stator yoke 211 includes a plurality of stator yoke laminations stacked along its axial direction and fixedly connected to each other. Compared with setting the stator gear 212 or the stator yoke 211 as a single structure, in this embodiment, the stator gear 212 and the stator yoke 211 are respectively divided into several independent thin pieces, so that the eddy current is confined within a single lamination, which can shorten the eddy current path, significantly reduce eddy current loss, and improve the motor working efficiency. Furthermore, since the connecting flow channel 333 arranged inside the stator gear 212 is located inside the stator shaft 213, the coolant flows inside the stator shaft 213. Compared with setting the coolant to flow directly in the positioning hole 210, this can prevent the coolant from leaking from the gap between adjacent stator gear laminations into the stator gear 212 or the winding structure 221, reducing the risk of burning out the winding structure 221 or corroding the winding structure 221 and stator gear 212, thus reducing the motor performance and extending the service life of the motor.

[0059] like Figure 10 As shown, in some specific embodiments, the stator gear 212 includes a gear connecting end 2121 detachably connected to the stator yoke 211, and a gear winding end 2122 connected to the gear connecting end 2121. The front end face of the gear connecting end 2121 and the front end face of the stator yoke 211 abut against the front limiting platform 101, and the rear end face of the gear connecting end 2121 and the rear end face of the stator yoke 211 abut against the rear limiting platform 102, thereby axially limiting the stator gear 212 and the stator yoke 211 between the front limiting platform 101 and the rear limiting platform 102, preventing the stator core 21 from moving axially relative to the housing assembly 1. A positioning hole 2010 is provided through the gear connecting end 2121, and the winding structure 221 is wound on the gear winding end 2122. The toothed connection end 2121 is provided with a dovetail tenon structure 2123, and the outer peripheral side wall of the stator yoke 211 is provided with a dovetail tenon groove structure 2111. The stator tooth 212 and the stator yoke 211 are joined together by the dovetail tenon structure 2123 and the dovetail tenon groove structure 2111 in the front-back direction, so that the stator tooth 212 is stably connected and does not easily move radially relative to the stator yoke 211.

[0060] like Figure 9As shown, in some specific embodiments, the stator yoke 211 is positioned and connected to the front limiting platform 101 and the rear limiting platform 102 through the positioning shaft 213, so that the stator gear 212 and the stator yoke 211 of the stator core 21 are respectively positioned and connected through several positioning shafts 213, which further improves the stability of the connection between the stator core 21 and the housing assembly 1. The two adjacent front return channels 331 are connected to the same rear return channel 332 through two positioning shafts 213 arranged on the stator gear 212 and one positioning shaft 213 arranged on the stator yoke 211. When the coolant flows in the positioning shaft 213 on the stator yoke 211, it can carry away the heat of the stator yoke 211, so that the coolant can flow sequentially through a rear return channel 332, three connecting channels 333, a front return channel 331, another three connecting channels 333, and another rear return channel 332, thereby cooling the housing assembly 1, stator gear 212, stator yoke 211, and motor winding 22. The coolant can flow towards the outlet channel 32 in the three connecting channels 333 at the same time, which improves the flow efficiency and helps the coolant to quickly carry away the absorbed heat from the outlet channel 32. In other embodiments, the two adjacent front return channels 331 may also be connected to the same rear return channel 332 through one or more positioning shafts 213 arranged on the stator gear 212 and two or more positioning shafts 213 arranged on the stator yoke 211, respectively.

[0061] like Figure 10 As shown, in some specific embodiments, the outer periphery of the stator yoke 211 is formed with a plurality of yoke tooth structures 2112 respectively arranged between two adjacent dovetail tenon structures 2111, wherein the stator yoke 211 is provided with positioning holes 210 for passing through the positioning shaft 213 and the yoke tooth structures 2112 are provided.

[0062] like Figure 2 As shown, in some specific embodiments, the gaps between the motor winding 22 and the stator teeth 212 and stator yoke 211, as well as the gaps inside the winding structure 221, are filled with potting compound 4. The potting compound 4 is generally epoxy potting compound. It has the effects of fixing the winding, insulating and protecting, conducting heat dissipation, moisture protection and shock resistance. It can quickly conduct the heat of the winding structure 221 and the stator teeth 212 to the coolant in the positioning shaft 213 on each stator tooth 212 and stator yoke 211 and carry it away, thereby improving the heat dissipation efficiency of the stator core 21 and the motor winding 22.

[0063] like Figure 7As shown, in some specific embodiments, there are also several heat dissipation plate structures 6 arranged between two adjacent winding structures 221. The heat dissipation plate structures 6 are made of materials such as aluminum with a higher thermal conductivity than potting compound. The gaps between the motor winding 22 and the stator gear 212, stator yoke 211, and heat dissipation plate structures 4, as well as the gaps inside the winding structures 221, are filled with potting compound 4, which can quickly conduct the heat of the winding structures 221 to the potting compound 4, further improving the heat dissipation efficiency.

[0064] like Figure 11 As shown, in some specific embodiments, the heat sink structure 5 includes a first heat absorber 51 and a second heat absorber 52 vertically connected to one end of the first heat absorber 51. The first heat absorber 51 is arranged in the gap between two adjacent winding structures 221 to absorb the heat from the adjacent sides of the two adjacent winding structures 221 in a timely manner and conduct it to the surrounding potting compound 4, so as to avoid heat accumulation between the adjacent sides of the two adjacent winding structures 221. The second heat absorber 52 covers the end sides of the two adjacent winding structures 221 to absorb the heat from the ends of the two adjacent winding structures 221 in a timely manner and conduct it to the surrounding potting compound 4, so as to avoid the heat at the ends of the winding structures 221 being too high, thereby dissipating heat and cooling the winding structures 221 in a timely manner. In one of the two adjacent heat dissipation structures 5, the first heat-absorbing plate 51 of one heat dissipation structure 5 is arranged in the gap between the two adjacent winding structures 221, and the second heat-absorbing plate 52 covers the front end side of the two adjacent winding structures 221; in the other heat dissipation structure 5, the first heat-absorbing plate 51 is arranged in the gap between the two adjacent winding structures 221, and the second heat-absorbing plate 52 covers the rear end side of the two adjacent winding structures 221. This facilitates the installation of each heat dissipation plate structure 5 between each of the two adjacent winding structures 221, and the heat of each winding structure 221 is absorbed and conducted in all directions through the first heat-absorbing plate 51 and the second heat-absorbing plate 52, thereby improving the heat dissipation efficiency of the winding structure 221.

[0065] like Figure 7 As shown, in some specific embodiments, the positioning shaft 213 on the stator yoke 211 and the first heat-absorbing plate 51 arranged on its outer side are arranged along the same radial plane, which is conducive to the heat absorbed by the heat dissipation plate structure 5 being conducted more quickly through the potting compound 4 between the first heat-absorbing plate 51 and the stator shaft 213 and part of the stator yoke 211, i.e., the yoke tooth structure 2112, to the coolant inside the stator shaft 213 and carried away.

[0066] like Figure 11As shown, in some specific embodiments, the first heat-absorbing plate 51 includes a first heat-absorbing part 511 arranged in the gap between two adjacent winding structures 221, and a second heat-absorbing part 512 arranged in the gap between the outer sides of the two adjacent winding structures 221 and the ends of their stator teeth 212. The second heat-absorbing part can then absorb heat from the outer sides of the two adjacent winding structures 221 and conduct it to the surrounding potting compound 4 or stator teeth 212, further absorbing and transmitting heat from each winding structure 221 in all directions. In this embodiment, the first heat-absorbing part 511 is configured as a plate-like structure with the distance between its two sides gradually increasing from the end closer to the stator yoke 211 to the end farther from the stator yoke 211. The second heat-absorbing part 512 is configured as a triangular prism structure matching the adjacent outer ends of the two adjacent stator teeth 212, increasing the volume of the first heat-absorbing plate 51, thereby further improving the heat dissipation efficiency of the winding structures 221.

[0067] In some specific embodiments, the outer periphery of the winding structure 221 is provided with insulating paper (not shown in the figure), and the outer periphery of the heat sink structure 5 is coated with an insulating coating to serve as motor insulation.

[0068] like Figure 2 , Figure 3 As shown, in some specific embodiments, a rotor assembly 6 is also included. The rotor assembly 6 includes a mounting frame 61 that is sleeved on the outside of the stator core 21 and rotates relative to the stator core 21, and a plurality of magnets 62 that are respectively disposed on the inner circumferential sidewall of the mounting frame 61 and arranged with gaps between them and the stator gear 212. The magnets 62 can rotate under the action of the rotating magnetic field generated when the stator assembly 2 is energized and drive the mounting frame 61 to rotate synchronously.

[0069] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

[0070] In summary, the above description is only a preferred embodiment of the present invention. All equivalent changes and modifications made within the scope of the claims of the present invention should be covered by the present invention.

Claims

1. A cooling device for a single-tooth external rotor motor, characterized in that, include: The housing assembly has a positioning groove recessed along its outer periphery, a front limiting platform arranged at the front end of the positioning groove, and a rear limiting platform arranged at the rear end of the positioning groove. The stator assembly includes a stator core and a motor winding. The stator core includes a stator yoke sleeved in a positioning groove and several stator teeth detachably connected to the outer periphery of the stator yoke. The stator teeth are positioned and connected to a front limiting platform and a rear limiting platform via positioning shafts. The motor winding includes several winding structures wound on each stator tooth. The water-cooled flow channel includes an inlet flow channel, an outlet flow channel, and an intermediate flow channel connecting the inlet flow channel and the outlet flow channel. The intermediate flow channel includes several front return flow channels located at the front end of the housing assembly, a rear return flow channel located at the rear end of the housing assembly, and connecting flow channels at both ends connected to a front return flow channel and a rear return flow channel, respectively. Adjacent front return flow channels are connected to the same rear return flow channel through at least one connecting flow channel. The positioning shaft is configured as a hollow structure to form part of the connecting flow channel, and the outer peripheral side of the front end of the positioning shaft is sealed to the front limiting platform, and the outer peripheral side of the rear end is sealed to the rear limiting platform. The stator gear has a through-hole for positioning. The front limiting platform has a front positioning channel corresponding to the front end of the positioning hole. The rear limiting platform has a rear positioning channel corresponding to the rear end of the positioning hole. The front end of the positioning shaft extends into the front positioning channel and is sealed to the front positioning channel by a front sealing ring sleeved between the outer periphery of the positioning shaft and the front positioning channel. The rear end extends into the rear positioning channel and is sealed to the rear positioning channel by a rear sealing ring sleeved between the outer periphery of the positioning shaft and the rear positioning channel.

2. The cooling device for a single-tooth external rotor motor according to claim 1, characterized in that: The front positioning channel and the rear positioning channel are arranged in the front-back direction, respectively. The connecting channel includes a front longitudinal flow channel arranged in the front-back direction and connected to the front return channel, a front cross flow channel connected to the front longitudinal flow channel and the front positioning channel, a rear longitudinal flow channel arranged in the front-back direction and connected to the rear return channel, a rear cross flow channel connected to the rear longitudinal flow channel and the rear positioning channel, and a hollow channel set in the positioning shaft. The front longitudinal flow channels are spaced apart on the side of the front positioning channel near the central axis of the housing assembly, and the rear longitudinal flow channels are spaced apart on the side of the rear positioning channel near the central axis of the housing assembly. The front end of the hollow channel is connected to the front cross flow channel, and the rear end is connected to the rear cross flow channel.

3. The cooling device for a single-tooth external rotor motor according to claim 2, characterized in that: The housing assembly includes a housing body, a front cover plate that covers the front end of the housing body and is fixed relative to the housing body, and a rear cover plate that covers the rear end of the housing body and is fixed relative to the housing body. The front end face of the housing body is recessed with several front return grooves, and the front return grooves and the front cover plate surround to form the front return channel. The front positioning channel, the front cross flow channel and the front longitudinal flow channel are arranged on the housing body, and the front longitudinal flow channel is connected to the front return groove. The rear end face of the housing body is recessed with a plurality of rear return grooves, the rear return grooves and the rear cover plate surround to form the rear return channel, the rear positioning channel, the rear cross flow channel and the rear longitudinal flow channel are provided on the housing body, and the rear longitudinal flow channel is connected to the rear return grooves.

4. The cooling device for a single-tooth external rotor motor according to claim 1, characterized in that: The stator gears include a gear connecting end detachably connected to the stator yoke and a gear winding end connected to the gear connecting end. The front end face of the gear connecting end and the front end face of the stator yoke abut against the front limiting platform, and the rear end face of the gear connecting end and the rear end face of the stator yoke abut against the rear limiting platform. The positioning hole is provided through the gear connecting end, and the winding structure is wound on the gear winding end. The toothed connection end is provided with a dovetail tenon structure, and the outer peripheral sidewall of the stator yoke is provided with a dovetail tenon groove structure. The stator tooth and the stator yoke are joined together in the front-to-back direction by the dovetail tenon structure and the dovetail tenon groove structure.

5. The cooling device for a single-tooth external rotor motor according to claim 1, characterized in that: The stator yoke is positioned and connected to the front and rear limiting platforms via the positioning shafts. Adjacent front return channels are connected to the same rear return channel via at least two positioning shafts arranged on the stator gears and at least one positioning shaft arranged on the stator yoke.

6. The cooling device for a single-tooth external rotor motor according to claim 5, characterized in that: The gaps between the motor windings and the stator teeth and stator yoke, as well as the gaps inside the winding structure, are filled with potting compound.

7. The cooling device for a single-tooth external rotor motor according to any one of claims 1-4, characterized in that: It also includes several heat dissipation plate structures arranged between two adjacent winding structures. The gaps between the motor windings and the stator teeth, stator yoke, and heat dissipation plate structures, as well as the gaps inside the winding structures, are filled with potting compound.

8. The cooling device for a single-tooth external rotor motor according to claim 7, characterized in that: The heat dissipation plate structure includes a first heat absorption plate and a second heat absorption plate vertically connected to one end of the first heat absorption plate. In two adjacent heat dissipation structures, the first heat absorption plate of one heat dissipation structure is arranged in the gap between two adjacent winding structures, and the second heat absorption plate covers the front end side of the two adjacent winding structures. In another heat dissipation structure, the first heat-absorbing plate is arranged in the gap between two adjacent winding structures, and the second heat-absorbing plate covers the rear end side of the two adjacent winding structures.

9. The cooling device for a single-tooth external rotor motor according to claim 1, characterized in that: It also includes a rotor assembly, which includes a mounting frame that is sleeved on the outside of the stator core and rotates relative to the stator core, and a number of magnets respectively disposed on the inner circumferential sidewall of the mounting frame and arranged with gaps between them and the stator teeth.

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