An outer rotor permanent magnet motor

Abstract

The present invention provides an outer rotor permanent magnet motor, belonging to the technical field of motors. The outer rotor permanent magnet motor provided by the present invention includes an outer rotor structure, an inner stator structure, and two end caps. The outer rotor permanent magnet motor also includes an air cooling structure and a water cooling structure. The air cooling structure includes two sets of self-circulating components, which are arranged on the end caps and correspond to each other one by one. When the outer rotor structure rotates, one set of self-circulating components automatically supplies air to the inside of the end caps, and the other set of self-circulating components discharges air. The water cooling structure includes a cooling water channel and an inlet and outlet water component. The cooling water channel is arranged inside an annular plate in the inner stator structure and is distributed in an S-shaped circuitous manner. The inlet and outlet water component is arranged on the inner stator structure and is used to circulate the supply and discharge of coolant to the cooling water channel. The present invention achieves air cooling and heat dissipation through the rotation of the outer rotor structure, combined with the stable water cooling and heat dissipation of the inner stator structure, greatly improving the heat dissipation effect of the motor.

Description

Technical Field

[0001] The present invention belongs to the technical field of motors, and more specifically, relates to an outer rotor permanent magnet motor. Background Art

[0002] An outer rotor permanent magnet motor is a permanent magnet synchronous motor with a rotor located outside the stator. It is commonly used in industrial motor fields such as elevators and belt conveyors.

[0003] The outer rotor permanent magnet motor includes an outer rotor structure, an inner stator structure and two end covers. The outer rotor structure includes a roller body and permanent magnets arranged on the inner circumference of the roller body; the inner stator structure is located inside the outer rotor structure and includes a shaft body, a stator bracket, a stator core and a stator winding, wherein the stator bracket includes a frame body and an annular plate, the frame body is fixed between the shaft body and the annular plate, and the stator core and stator winding are installed on the outer circumference of the annular plate; the end covers are buckled on both ends of the roller body.

[0004] To extend the lifespan of motors, a heat dissipation cooling structure is typically installed. Currently, existing motor cooling systems use a fan to dissipate heat. A fan is installed on one end shell, and a heat dissipation vent is opened on the other end shell. The fan blows air into the motor, passing through the gap between the permanent magnets and the stator core before being exhausted through the heat dissipation vent. However, due to the limited width of the gap between the permanent magnets and the stator core, heat dissipation is ineffective. Summary of the Invention

[0005] The object of the present invention is to provide an outer rotor permanent magnet motor to solve the technical problem in the prior art that the heat dissipation effect is poor due to the limited width of the gap between the permanent magnet and the stator core.

[0006] To achieve the above object, the technical solution adopted by the present invention is: to provide an outer rotor permanent magnet motor, comprising an outer rotor structure, an inner stator structure and two end covers; and further comprising an air cooling structure and a water cooling structure;

[0007] The air-cooling structure comprises:

[0008] Two sets of self-circulating components are arranged on the outside of the two end covers in a one-to-one correspondence; the self-circulating components have a plurality of air guide ports connected to the inside of the end covers, the openings of the air guide ports are oriented towards the rotation direction of the outer rotor structure, and the opening directions of the air guide ports on the two end covers are opposite;

[0009] When the outer rotor structure rotates, one group of the self-circulating components automatically supplies air to the inner side of the end cover through the air guide port, and the other group of the self-circulating components discharges air; when the outer rotor structure rotates forward and reverse, the air intake and air discharge actions of the two groups of the self-circulating components automatically alternate; a first air-cooling channel is formed between the permanent magnets in the outer rotor structure and the stator core in the inner stator structure;

[0010] The water cooling structure comprises:

[0011] A cooling water channel is provided inside the annular plate in the inner stator structure and is distributed in an S-shaped circuitous manner; and

[0012] The water inlet and outlet components are arranged on the inner stator structure and are used for circulating the supply and discharge of coolant to the cooling water channel.

[0013] In combination with the above technical solution, in a possible implementation, the self-circulation component includes:

[0014] A plurality of ventilation caps are circumferentially distributed on the outer side wall of the end cover and are connected to the interior of the outer rotor structure; the air guide port is opened on one side of the ventilation cap; wherein the opening directions of the ventilation caps on the two end covers are opposite.

[0015] In combination with the above technical solution, in a possible implementation, the self-circulation component further includes:

[0016] A plurality of protective nets are arranged in a one-to-one correspondence inside the plurality of ventilation hoods, and the protective nets are used to separate the air guide port and the internal space of the outer rotor structure.

[0017] In combination with the above technical solution, in a possible implementation, a plurality of ventilation holes are provided on the stator bracket in the inner stator structure. The ventilation holes are provided along the axial direction of the inner stator structure, and the ventilation holes located on the same axis form a second air-cooling channel.

[0018] In combination with the above technical solution, in a possible implementation manner, the radial position of the ventilating hood is located between the first air-cooling channel and the second air-cooling channel.

[0019] In combination with the above technical solution, in a possible implementation, the cooling water channel includes:

[0020] a plurality of DC segments, circumferentially spaced and distributed inside the annular plate in the inner stator structure, wherein the DC segments extend in a direction parallel to the axial direction of the inner stator structure; and

[0021] A plurality of bending sections are connected between the ends of two adjacent direct current sections and are close to both ends of the annular plate.

[0022] In combination with the above technical solution, in a possible implementation, the cooling water channel further includes:

[0023] an arc-shaped flow guide section, located at one end inside the annular plate in the inner stator structure;

[0024] Among them, the water outlet of the water inlet and outlet assembly is connected to one of the direct current sections, the water inlet of the water inlet and outlet assembly is connected to one end of the arc-shaped guide section, the other end of the arc-shaped guide section is connected to another direct current section, and this direct current section is adjacent to the water outlet of the water inlet and outlet assembly.

[0025] In combination with the above technical solution, in a possible implementation, the annular plate is axially divided into an inner cover shell and an outer cover shell along the outer circumference of the cooling water channel, and the outer cover shell is detachably fixed to the inner cover shell.

[0026] In combination with the above technical solution, in a possible implementation, the water inlet and outlet components include:

[0027] an inlet and outlet water seat fixed on the shaft in the inner stator structure, one end of the inlet and outlet water seat being located outside the end cover and used for connecting to an external circulating cooling system, and the other end of the inlet and outlet water seat being located inside the end cover; and

[0028] Two inlet and outlet pipes are located inside the end cover and connected between the inner end of the inlet and outlet water seat and the cooling water channel;

[0029] The water inlet and outlet seat has two flow channels connected to the inner and outer ends thereof, and the flow channels are connected to the inlet and outlet pipes in a one-to-one correspondence.

[0030] In combination with the above technical solution, in a possible implementation, a bearing is provided between each end cover and the shaft in the inner stator structure, and one of the bearings is located between the end cover and the water inlet and outlet seats.

[0031] The beneficial effect of the outer rotor permanent magnet motor provided by the present invention is that: compared with the existing technology, the present invention integrates the air cooling structure and the water cooling structure to form an efficient and coordinated heat dissipation system. In the air cooling structure, the two sets of self-circulating components are linked with the rotation of the outer rotor structure. When the outer rotor structure rotates, the air flow enters the motor from the air guide port on the ventilating cap and is discharged from the ventilating cap on the other end cover, realizing self-circulating air cooling without the need for an additional fan; when the outer rotor rotates forward and reverse alternately, the air intake and exhaust actions of the two sets of self-circulating components automatically alternate accordingly, saving additional driving energy consumption; in the water cooling structure, multiple sections of cooling water surrounding the curved circle are connected to form a water cooling system. The channel forms a dense and uniform cooling network inside the annular plate, which greatly increases the contact area between the coolant and the inner stator structure, and can efficiently absorb the heat generated by the stator core and winding; and the first air-cooling channel and the cooling water channel are physically isolated from each other to reduce direct heat exchange, avoid the heat of water cooling being carried into the rotor by the wind or the heat of air cooling heating the cooling water, prevent moisture condensation or pollution, and greatly improve the operating reliability of the motor; in summary, by utilizing the characteristics of the outer rotor motor, air cooling heat dissipation is achieved through the rotation of the outer rotor structure, combined with the stable water cooling heat dissipation of the non-rotating inner stator structure, the heat dissipation effect of the motor is greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0033] Figure 1 A schematic structural diagram of an outer rotor permanent magnet motor provided by an embodiment of the present invention;

[0034] Figure 2 A vertical cross-sectional view of an outer rotor permanent magnet motor provided by an embodiment of the present invention;

[0035] Figure 3 A schematic structural diagram of a ventilating cap provided in an embodiment of the present invention;

[0036] Figure 4 A front view of the outer side of one of the end covers provided in an embodiment of the present invention;

[0037] Figure 5 A front view of the outer side of another end cover provided by an embodiment of the present invention;

[0038] Figure 6 A vertical cross-section of the stator support and cooling water channel provided in an embodiment of the present invention Figure 1 ;

[0039] Figure 7 A vertical cross-section of the stator support and cooling water channel provided in an embodiment of the present invention Figure 2 ;

[0040] Figure 8 A planar expansion diagram of a cooling water channel provided in an embodiment of the present invention;

[0041] Figure 9 A vertical cross-sectional view of a water inlet and outlet assembly provided in an embodiment of the present invention;

[0042] Figure 10 A vertical cross-sectional view of the water inlet and outlet seat provided in an embodiment of the present invention.

[0043] Among them, the reference numerals in the figures are as follows:

[0044] 1. Outer rotor structure; 11. Drum body; 12. Permanent magnet;

[0045] 2. Inner stator structure; 21. Shaft; 22. Stator bracket; 221. Frame; 222. Ring plate; 2221. Inner housing; 2222. Outer housing; 23. Stator core; 24. Stator winding;

[0046] 3. End cover; 31. Bearing;

[0047] 4. Self-circulation component; 41. Ventilation cap; 411. Air guide port; 42. Protective net;

[0048] 5. The first air cooling channel;

[0049] 6. Cooling water channel; 61. Straight section; 62. Bend section; 63. Diversion section;

[0050] 7. Water inlet and outlet components; 71. Water inlet and outlet seats; 711. Flow channel; 72. Inlet and outlet pipes;

[0051] 8. Second air cooling channel. DETAILED DESCRIPTION

[0052] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the described embodiments are only part of the embodiments of this application, rather than all the embodiments, and the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0053] It should be further explained that the drawings and implementation methods of the present invention mainly describe the concept of the present invention. On the basis of this concept, the specific forms and settings of some connection relationships, positional relationships, power mechanisms, power supply systems and control systems may not be fully described. However, on the premise that those skilled in the art understand the concept of the present invention, those skilled in the art can implement the above-mentioned specific forms and settings in a familiar manner.

[0054] When an element is referred to as being “fixed to” or “disposed on” another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being “connected to” another element, it can be directly connected to the other element or indirectly connected to the other element.

[0055] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be subsequently positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device may also be positioned in other different ways, and the spatially relative descriptions used herein are interpreted accordingly.

[0056] 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 technical features being referred to. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "plurality" means two or more, and "several" means one or more, unless otherwise specifically defined.

[0057] An outer rotor permanent magnet motor provided by the present invention is now described.

[0058] like Figure 1 and Figure 2As shown, an embodiment of the present invention provides an outer rotor permanent magnet motor, including an outer rotor structure 1, an inner stator structure 2 and two end covers 3; the outer rotor structure 1 includes a drum body 11 and a permanent magnet 12 arranged on the inner circumference of the drum body 11; the inner stator structure 2 is located inside the outer rotor structure 1, and includes a shaft 21, a stator bracket 22, a stator core 23 and a stator winding 24, wherein the stator bracket 22 includes a frame 221 and an annular plate 222, the frame 221 is fixed between the shaft body 21 and the annular plate 222, and the stator core 23 and the stator winding 24 are installed on the outer circumference of the annular plate 222; the end covers 3 are buckled at both ends of the drum body 11.

[0059] The outer rotor permanent magnet motor also includes an air cooling structure and a water cooling structure; the air cooling structure includes two groups of self-circulation components 4, which are arranged one by one on the outside of the two end covers 3; the self-circulation components 4 have multiple air guide ports 411 connected to the inner side of the end cover 3, and the openings of the air guide ports 411 are facing the rotation direction of the outer rotor structure 1, and the opening directions of the air guide ports 411 on the two end covers 3 are opposite.

[0060] Among them, when the outer rotor structure 1 rotates, one group of self-circulation components 4 automatically supplies air to the inside of the end cover 3 through the air guide port 411, and the other group of self-circulation components 4 discharges air; when the outer rotor structure 1 alternates between forward and reverse rotation, the air intake and air discharge actions of the two groups of self-circulation components 4 automatically alternate; a first air-cooling channel 5 is formed between the permanent magnet 12 in the outer rotor structure 1 and the stator core 23 in the inner stator structure 2.

[0061] The water cooling structure includes a cooling water channel 6 and an inlet and outlet water assembly 7. The cooling water channel 6 is arranged inside the annular plate 222 in the inner stator structure 2 and is distributed in an S-shaped circuitous manner; the inlet and outlet water assembly 7 is arranged on the inner stator structure 2 and is used to circulate the supply and discharge of coolant to the cooling water channel 6.

[0062] The outer rotor permanent magnet motor provided in this embodiment forms an efficient and coordinated heat dissipation system by integrating the air cooling structure and the water cooling structure compared with the prior art. In the air cooling structure, when the outer rotor structure 1 rotates, the air flow enters the interior of the motor from the air guide ports 411 in one group of self-circulation components 4, and is then discharged from the air guide ports 411 in another group of self-circulation components 4, thereby realizing self-circulation air cooling without the need for an additional fan, which not only simplifies the motor structure, but also reduces energy consumption and failure risks.

[0063] The opening directions of the air guide ports 411 on the two end covers 3 are opposite to each other and match the forward and reverse rotation characteristics of the outer rotor structure 1. When the outer rotor structure 1 rotates forward, one group of the air guide ports 411 in the self-circulation components 4 become air inlets because their opening directions match the rotation direction, and the other group becomes air outlets because their opening directions are opposite; when the outer rotor structure 1 reverses, the air intake and exhaust states are automatically switched, ensuring that the air cooling structure can always maintain effective air circulation when the motor is running alternately in forward and reverse directions, continuously dissipating heat inside the motor, ensuring the heat dissipation stability of the motor under bidirectional operating conditions, and enhancing the motor's adaptability to complex working scenarios.

[0064] In the water-cooling structure, multiple sections of curved circular cooling water channels 6 form a dense and uniform cooling network inside the annular plate 222, greatly increasing the contact area between the coolant and the inner stator structure 2, and can efficiently absorb the heat generated by the stator core 23 and the winding. The inlet and outlet water components 7 ensure the continuous circulation of the coolant, so that the coolant after absorbing heat can be discharged in time and replenished with new low-temperature coolant, further enhancing the heat dissipation effect.

[0065] In addition, the first air-cooling channel 5 and the cooling water channel 6 are physically isolated to reduce direct heat exchange, prevent the heat of water cooling from being carried into the rotor by the wind or the heat of air cooling from heating the cooling water, and prevent moisture condensation or pollution. The dual effects of air cooling and water cooling can adapt to the heat dissipation requirements of the motor under different loads and different working conditions, effectively avoiding problems such as performance degradation and shortened service life of the motor due to overheating, and greatly improving the operating reliability of the motor.

[0066] In summary, by utilizing the characteristics of the outer rotor motor, air cooling is achieved through the rotation of the outer rotor structure 1, combined with stable water cooling of the non-rotating inner stator structure 2, which greatly improves the heat dissipation effect of the motor.

[0067] like Figures 3 to 5 As shown, the present invention provides a specific implementation method based on the above implementation method as follows:

[0068] A plurality of ventilation caps 41 are circumferentially distributed on the outer wall of the end cover 3 and are connected to the interior of the outer rotor structure 1; the air guide port 411 is opened on one side of the ventilation cap 41; wherein, the opening directions of the ventilation caps 41 on the two end covers 3 are opposite.

[0069] The setting of the ventilation cap 41 can realize the circumferential distribution of the air guide 411, so that when the outer rotor structure 1 rotates, the air flow can evenly enter the interior of the motor through the circumferentially distributed air guide 411, reducing the heat dissipation dead angle inside the motor and improving the air cooling effect on the motor.

[0070] like Figure 3As shown, the present invention provides a specific implementation method based on the above implementation method as follows:

[0071] The self-circulation component 4 also includes a plurality of protective nets 42 corresponding one to one with the ventilation caps 41 . The protective nets 42 are arranged inside the ventilation caps 41 to separate the air guide port 411 from the internal space of the outer rotor structure 1 .

[0072] On the one hand, the protective net 42 can effectively block external dust, impurities, water vapor, etc. from entering the interior of the motor, preventing these foreign objects from adhering to key components such as the permanent magnet 12, the stator core 23, and the winding, thereby preventing the motor insulation performance degradation, short circuit, wear and other faults caused by foreign objects, thereby extending the maintenance cycle and service life of the motor.

[0073] On the other hand, the protective net 42 does not significantly hinder the normal flow of air, ensuring the smooth flow of the cooling channel and ensuring that the heat dissipation effect is not affected. At the same time, the protective net 42 can also prevent the internal parts of the motor from accidentally flying out of the ventilating cap 41, thereby improving the safety of the motor operation.

[0074] like Figure 2 As shown, the present invention provides a specific implementation method based on the above implementation method as follows:

[0075] A plurality of ventilation holes are provided on the stator bracket 22 in the inner stator structure 2 . The ventilation holes are provided along the axial direction of the inner stator structure 2 , and the ventilation holes on the same axis form a second air-cooling channel 8 .

[0076] The presence of the second air cooling channel 8 increases the air flow path within the motor, allowing heat to be quickly dissipated through multiple channels, preventing heat accumulation in localized areas. Furthermore, the axially arranged ventilation holes align with the overall structure of the motor, creating minimal airflow resistance. This increases air circulation speed, enhances heat dissipation efficiency, and maintains a more uniform temperature across the motor's internal components, improving operational stability.

[0077] like Figure 2 As shown, the present invention provides a specific implementation method based on the above implementation method as follows:

[0078] The radial position of the ventilating cap 41 is located between the first air cooling channel 5 and the second air cooling channel 8 .

[0079] When the air flow enters the motor from the ventilation hood 41, it can be diverted to the first air-cooling channel 5 and the second air-cooling channel 8 at the same time, so that the air flow can cover the two channels more efficiently; and when the air flow is discharged from the channel, it can also be more smoothly gathered to the ventilation hood 41 and discharged outside the motor, reducing the resistance and loss of the air flow during the circulation process, improving the efficiency of air circulation, and ensuring that both air-cooling channels can obtain sufficient air flow, thereby enhancing the overall air cooling effect.

[0080] At the same time, the air flow distribution inside the motor is made more reasonable, avoiding the problem of insufficient air flow and uneven heat dissipation in some areas caused by improper position of the ventilating cap 41, further improving the heat dissipation uniformity and reliability of the motor

[0081] like Figures 6 to 8 As shown, the present invention provides a specific implementation method based on the above implementation method as follows:

[0082] The cooling water channel 6 includes multiple direct current sections 61 and multiple bent sections 62; the multiple direct current sections 61 are circumferentially spaced inside the annular plate 222 in the inner stator structure 2, and the direct current sections 61 are parallel to the axial direction of the inner stator structure 2; the multiple bent sections 62 are connected between the ends of two adjacent direct current sections 61, and the bent sections 62 are located near the two ends of the annular plate 222 in the inner stator structure 2.

[0083] By combining the direct current section 61 and the bent section 62, the contact area between the coolant and the annular plate 222 can be maximized. The direct current sections 61 and the bent sections 62 are interconnected to form a complete cooling circuit, ensuring that the coolant can circulate smoothly in the entire water channel and avoiding the existence of cooling dead corners. The coolant continuously flows through both ends of the annular plate 222, avoiding the generation of temperature gradients at both ends of the inner stator structure 2, and dissipating heat more evenly. The direct current section 61 can make the coolant flow more smoothly and facilitate the subsequent removal after scaling. It has a simple structure and is easy to produce.

[0084] like Figure 8 As shown, the present invention provides a specific implementation method based on the above implementation method as follows:

[0085] The cooling water channel 6 further includes an arc-shaped guide section 63 , which is located at one end inside the annular plate 222 in the inner stator structure 2 ;

[0086] Among them, the water outlet of the water inlet and outlet component 7 is connected to one of the DC sections 61, the water inlet of the water inlet and outlet component 7 is connected to one end of the arc-shaped guide section 63, and the other end of the arc-shaped guide section 63 is connected to another DC section 61, and this DC section 61 is adjacent to the water outlet of the water inlet and outlet component 7.

[0087] The water inlet and outlet components 7 inject the coolant into the arc-shaped guide section 63. Its smooth arc-shaped structure can effectively reduce the resistance of the coolant during the flow process, so that the coolant can smoothly transition from one direct current section 61 to another direct current section 61, and can realize the coolant flowing through the direct current section 61 between the water inlet and the water outlet in the cooling water channel 6, ensuring that each direct current section 61 and the bending section 62 can be fully passed by the coolant, thereby realizing the full utilization of the cooling water channel 6.

[0088] like Figure 6As shown, the present invention provides a specific implementation method based on the above implementation method as follows:

[0089] The annular plate 222 is axially divided into an inner shell 2221 and an outer shell 2222 along the outer circumference of the cooling water channel 6. The outer shell 2222 is detachably fixed to the inner shell 2221. Specifically, the detachable connection between the outer shell 2222 and the inner shell 2221 can be a shrink fit process or a screw connection.

[0090] During the manufacturing process, the water channels of the inner and outer housings 2221 and 2222 can be processed separately, simplifying the machining of complex water channels and reducing manufacturing requirements and production costs. During installation, the cooling water channels 6 can be cleaned and inspected more easily to ensure they are free of impurities and blockages. If a blockage or leak occurs in the cooling water channels 6, repair or replacement can be performed by simply removing the outer housing 2222.

[0091] like Figure 9 and Figure 10 As shown, the present invention provides a specific implementation method based on the above implementation method as follows:

[0092] The water inlet and outlet assembly 7 includes a water inlet and outlet seat 71 and two inlet and outlet pipes 72; the water inlet and outlet seat 71 is fixed to the shaft 21 in the inner stator structure 2, one end of the water inlet and outlet seat 71 is located outside the end cover 3 and is used to connect to the external circulating cooling system, and the other end of the water inlet and outlet seat 71 is located inside the end cover 3; the two inlet and outlet pipes 72 are located inside the end cover 3 and connected between the inner end of the water inlet and outlet seat 71 and the cooling water channel 6;

[0093] The water inlet and outlet seat 71 has two flow channels 711 connected to its inner and outer ends, and the flow channels 711 are connected to the inlet and outlet pipes 72 in a one-to-one correspondence. The external circulation cooling system connected to the outer end of the water inlet and outlet seat 71 can be a heat exchanger or a cooling tower.

[0094] The external coolant enters one of the flow channels 711 in the water inlet and outlet seat 71, and then enters the cooling water channel 6 through the inlet and outlet pipe 72. The coolant at the outlet of the cooling water channel 6 flows through another inlet and outlet pipe 72 to another flow channel 711 of the inlet and outlet seat 71 for discharge, so that the water inlet and water outlet can be carried out independently without interfering with each other, ensuring the one-way circulation of the coolant, avoiding the mixing of cold and hot coolants, and improving the heat exchange efficiency.

[0095] Furthermore, the arrangement of the water inlet and outlet seats 71 eliminates the need to drill holes in the shaft 21 for the water inlet pipe to enter the interior of the motor, thereby ensuring the inherent strength of the shaft 21 .

[0096] like Figure 9 As shown, the present invention provides a specific implementation method based on the above implementation method as follows:

[0097] A bearing 31 is provided between each end cover 3 and the shaft 21 in the inner stator structure 2 , wherein one of the bearings 31 is located between the end cover 3 and the water inlet and outlet seats 71 .

[0098] The arrangement of the bearing 31 ensures smooth relative rotation between the end cap 3 and the shaft 21, reduces friction loss, and improves the mechanical efficiency and operational stability of the motor. Furthermore, since the coolant circulates within the inlet and outlet water seats 71, the bearing 31 can be cooled.

[0099] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

[0100] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0101] Unless otherwise specifically stated, the relative arrangement of the parts and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to actual proportional relationships. Technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, technology, methods and equipment should be considered as part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, and therefore, once an item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

Claims

1. An outer rotor permanent magnet motor, comprising an outer rotor structure (1), an inner stator structure (2) and two end covers (3); characterized in that: It also includes air-cooled structure and water-cooled structure; The air-cooling structure comprises: Two groups of self-circulating components (4) are arranged on the outside of the two end covers (3) in a one-to-one correspondence; the self-circulating components (4) have a plurality of air guide ports (411) connected to the inside of the end covers (3), the openings of the air guide ports (411) face the rotation direction of the outer rotor structure (1), and the opening directions of the air guide ports (411) on the two end covers (3) are opposite; The self-circulating component (4) comprises: A plurality of ventilation caps (41) are circumferentially distributed on the outer side wall of the end cover (3) and communicate with the interior of the outer rotor structure (1); the air guide port (411) is opened on one side of the ventilation cap (41); wherein the opening directions of the ventilation caps (41) on the two end covers (3) are opposite; Wherein, when the outer rotor structure (1) rotates, one group of the self-circulating components (4) automatically supplies air to the inner side of the end cover (3) through the air guide port (411), and the other group of the self-circulating components (4) discharges air; when the outer rotor structure (1) rotates alternately in forward and reverse directions, the air intake and air discharge actions of the two groups of the self-circulating components (4) automatically alternate; a first air cooling channel (5) is formed between the permanent magnet (12) in the outer rotor structure (1) and the stator core (23) in the inner stator structure (2); The water cooling structure comprises: A cooling water channel (6) is arranged inside the annular plate (222) in the inner stator structure (2) and is distributed in an S-shaped circuitous manner; and The water inlet and outlet assembly (7) is arranged on the inner stator structure (2) and is used to circulate the supply and discharge of cooling liquid to the cooling water channel (6).

2. The outer rotor permanent magnet motor according to claim 1, characterized in that: The self-circulating component (4) further comprises: A plurality of protective nets (42) are arranged one by one inside the plurality of ventilation caps (41), and the protective nets (42) are used to separate the air guide port (411) and the internal space of the outer rotor structure (1).

3. The outer rotor permanent magnet motor according to claim 1, characterized in that: A plurality of ventilation holes are provided on the stator bracket (22) in the inner stator structure (2), wherein the ventilation holes are provided along the axial direction of the inner stator structure (2), and the ventilation holes located on the same axis form a second air cooling channel (8).

4. The outer rotor permanent magnet motor according to claim 3, characterized in that: The radial position of the ventilation cap (41) is located between the first air cooling channel (5) and the second air cooling channel (8).

5. The outer rotor permanent magnet motor according to claim 1, characterized in that: The cooling water channel (6) comprises: a plurality of DC segments (61) circumferentially spaced and distributed inside the annular plate (222) in the inner stator structure (2), wherein the extension direction of the DC segments (61) is parallel to the axial direction of the inner stator structure (2); and A plurality of bending sections (62) are connected between the ends of two adjacent direct current sections (61) and are close to both ends of the annular plate (222).

6. The outer rotor permanent magnet motor according to claim 5, characterized in that: The cooling water channel (6) further comprises: An arc-shaped flow guide section (63) located at one end inside the annular plate (222) in the inner stator structure (2); The water outlet of the water inlet and outlet assembly (7) is connected to one of the direct current sections (61), the water inlet of the water inlet and outlet assembly (7) is connected to one end of the arc-shaped guide section (63), the other end of the arc-shaped guide section (63) is connected to another direct current section (61), and the direct current section (61) is adjacent to the water outlet of the water inlet and outlet assembly (7).

7. The outer rotor permanent magnet motor according to claim 5, characterized in that: The annular plate (222) is axially divided into an inner cover shell (2221) and an outer cover shell (2222) along the outer peripheral surface of the cooling water channel (6); the outer cover shell (2222) is detachably fixed to the inner cover shell (2221).

8. An outer rotor permanent magnet motor according to claim 1 or 5, characterized in that: The water inlet and outlet assembly (7) comprises: an inlet and outlet water seat (71) fixed on the shaft (21) in the inner stator structure (2), one end of the inlet and outlet water seat (71) being located outside the end cover (3) and used for connecting to an external circulating cooling system, and the other end of the inlet and outlet water seat (71) being located inside the end cover (3); and Two inlet and outlet pipes (72) are located inside the end cover (3) and connected between the inner end of the inlet and outlet water seat (71) and the cooling water channel (6); The water inlet and outlet seat (71) has two flow channels (711) connected to its inner and outer ends, and the flow channels (711) are connected to the inlet and outlet pipes (72) in a one-to-one correspondence.

9. The outer rotor permanent magnet motor according to claim 8, characterized in that: A bearing (31) is provided between each end cover (3) and the shaft (21) in the inner stator structure (2), wherein one of the bearings (31) is located between the end cover (3) and the water inlet and outlet seat (71).

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