Air-cooled structure and outer rotor permanent magnet motor

Abstract

This invention provides an air-cooled structure and an external rotor permanent magnet motor, belonging to the technical field of motors. The external rotor permanent magnet motor includes an external rotor structure, an inner stator structure, and two end covers. The air-cooled structure includes two sets of through holes and two sets of ventilation caps. The two sets of through holes are respectively opened on the two end covers. Each set of ventilation holes has multiple holes spaced apart along the circumference of the end cover. The two sets of ventilation caps correspond one-to-one with the two sets of through holes. Each set of ventilation caps has multiple holes spaced apart along the circumference of the end cover and covers the periphery of the corresponding through holes. Each set of ventilation caps has air guides facing the same rotation direction, and the two sets of air guides face opposite directions. This invention achieves self-circulating air cooling without the need for an additional fan, simplifying the motor structure and reducing energy consumption, noise, and the risk of failure.

Description

Technical Field

[0001] This utility model belongs to the technical field of electric motors, and more specifically, it relates to an air-cooled structure and an external rotor permanent magnet motor. Background Technology

[0002] An external rotor permanent magnet motor is a type of permanent magnet synchronous motor in which the rotor is located outside the stator. It is commonly used in industrial motor applications such as hoists and belt conveyors.

[0003] The external rotor permanent magnet motor includes an external rotor structure, an inner stator structure, and two end covers. The external rotor structure includes a drum body and permanent magnets disposed on the inner circumferential surface of the drum body. The inner stator structure is located inside the external rotor structure and includes a shaft, a stator support, a stator core, and a stator winding. The stator support is mounted on the shaft body, and the stator core and stator winding are mounted on the stator support. The end covers are fastened to both ends of the drum body.

[0004] To extend the lifespan of motors, cooling structures are typically installed. Current motor cooling systems use fans for airflow. A fan is mounted on one end housing, and a vent is located on the other. Air is blown into the motor by the fan, passing through the gap between the permanent magnet and the stator core, and then exiting through the vent. However, since the end housings rotate together with the outer rotor, the presence of the fan affects the safety of motor operation, and the fan also generates noise during operation. Utility Model Content

[0005] The purpose of this utility model is to provide an air-cooled structure for an external rotor permanent magnet motor, so as to solve the technical problems in the prior art where the presence of a fan affects the safety of motor use and the fan generates noise during operation.

[0006] To achieve the above objectives, firstly, the technical solution adopted by this utility model is: providing an air-cooled structure for installation on an external rotor permanent magnet motor, wherein the external rotor permanent magnet motor includes an external rotor structure, an inner stator structure, and two end covers; the air-cooled structure includes: Two sets of through holes are respectively formed on the two end caps; each set of through holes has multiple holes spaced apart circumferentially along the end cap; and Two sets of ventilation caps correspond one-to-one with the two sets of through holes; each set of ventilation caps has multiple caps spaced apart along the circumference of the end cap and covers the periphery of the corresponding through hole; In this case, the ventilation caps in the same group have air guides facing the same rotation direction, and the air guides in the two groups face opposite directions. In conjunction with the first aspect, in one possible implementation, the ventilation cap includes: The outer cap body is located outside the end cap, and the air vent is located on the outer cap body; The inner cylinder, connected to the outer cap, is used for insertion into the through hole; and A limiting ring plate is fixed between the outer cap body and the inner cylinder body, and the outer diameter of the limiting ring plate is larger than the diameter of the through hole.

[0007] In conjunction with the first aspect, in one possible implementation, the air-cooled structure further includes: Multiple protective nets, each corresponding to a ventilation cap, are installed inside the ventilation cap. The protective nets are used to isolate the air vent from the internal space of the outer rotor structure.

[0008] In conjunction with the first aspect, in one possible implementation, the outer cap body is arranged in a hemispherical shape.

[0009] In conjunction with the first aspect, in one possible implementation, the limiting ring plate is detachably connected to the end cap.

[0010] In conjunction with the first aspect, in one possible implementation, an annular gasket is provided between the limiting ring plate and the end cap.

[0011] In conjunction with the first aspect, in one possible implementation, the air-cooled structure further includes: Multiple ventilation holes are provided on the stator support in the inner stator structure and are opened along the axial direction of the inner stator structure.

[0012] In conjunction with the first aspect, in one possible implementation, the gap between the permanent magnet in the outer rotor structure and the stator core in the inner stator structure is defined as the first air-cooling channel, and the ventilation hole located on the same axis is defined as the second air-cooling channel; the radial position of the ventilation cap is located between the first air-cooling channel and the second air-cooling channel.

[0013] In conjunction with the first aspect, in one possible implementation, the second air-cooling channels are circumferentially distributed on the stator support, and the number of the second air-cooling channels and the ventilation caps are consistent with the spacing angle.

[0014] Secondly, this utility model also provides an external rotor permanent magnet motor, including the above-mentioned air-cooled structure.

[0015] The beneficial effects of the air-cooling structure provided by this utility model are as follows: Compared with the prior art, when the outer rotor structure of this utility model rotates, the external airflow can enter the motor through the air guide and through hole on one end cover and exit from the through hole and air guide on the other end cover. This makes the ventilation inside the motor more uniform, avoids the problem of local overheating, and realizes self-circulating air cooling without the need for an additional fan. This not only simplifies the motor structure but also reduces energy consumption, noise, and failure risk. Furthermore, since the air guides on the two end covers face opposite directions, the outer rotor structure can achieve air intake on one end cover and air exhaust on the other end cover, whether rotating forward or backward. This ensures the heat dissipation stability of the motor under bidirectional operation conditions and enhances the motor's adaptability to complex working scenarios. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of a wind-cooled structure provided in an embodiment of the present invention; Figure 2 This is a vertical sectional view of an air-cooled structure provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of the ventilation cap and protective net provided in an embodiment of the present invention; Figure 4 This is a front view of one of the outer surfaces of an end cap provided in an embodiment of the present invention; Figure 5 This is a front view of the outer side of another end cap provided in an embodiment of the present invention; Figure 6 A circumferential distribution view of the second air-cooling channel provided in an embodiment of the present invention.

[0018] The labels for the attached figures are as follows: 1. External rotor structure; 11. Drum body; 12. Permanent magnet; 2. Inner stator structure; 21. Shaft; 22. Stator bracket; 23. Stator core; 24. Stator winding; 3. End cap; 31. Through hole; 4. Ventilation cap; 41. Outer cap body; 42. Inner cylinder body; 43. Limiting ring plate; 5. Protective netting; 6. Air vent; 7. First air-cooled aisle; 8. Second air-cooling duct. Detailed Implementation

[0019] To make the technical problem to be solved, the technical solution, and the beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the described embodiments are only a part of the embodiments of this application, not all of them. The specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0020] It should be further noted that the accompanying drawings and embodiments of this utility model mainly describe the concept of this utility model. Based on this concept, some specific forms and settings of connection relationships, positional relationships, power mechanisms, power supply systems and control systems may not be fully described. However, under the premise that those skilled in the art understand the concept of this utility model, they can implement the above-mentioned specific forms and settings in a well-known manner.

[0021] When a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0022] 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 number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "multiple" means two or more, and "several" means one or more, unless otherwise explicitly specified.

[0023] The air-cooling structure of an external rotor permanent magnet motor provided by this utility model will now be described.

[0024] like Figure 1 and Figure 2As shown, the first embodiment of this utility model provides an air-cooled structure for installation on an external rotor permanent magnet motor. The external rotor permanent magnet motor includes an external rotor structure 1, an inner stator structure 2, and two end covers 3. The external rotor structure 1 includes a roller body 11 and permanent magnets 12 disposed on the inner circumferential surface of the roller body 11. The inner stator structure 2 is located inside the external rotor structure 1 and includes a shaft 21, a stator support 22, a stator core 23, and a stator winding 24. The stator core 23 and the stator winding 24 are mounted on the stator support 22. The end covers 3 are fastened to both ends of the roller body 11.

[0025] like Figure 2 and Figure 3 As shown, the air-cooled structure includes two sets of through holes 31 and two sets of ventilation caps 4. The two sets of through holes 31 are respectively opened on the two end caps 3. Each set of through holes 31 has multiple holes spaced apart along the circumference of the end cap 3. The two sets of ventilation caps 4 correspond one-to-one with the two sets of through holes 31. Each set of ventilation caps 4 has multiple holes spaced apart along the circumference of the end cap 3 and covers the periphery of the corresponding through hole 31.

[0026] Among them, the same set of ventilation caps 4 have air guide ports 6 facing the same rotation direction, and the two sets of air guide ports 6 are oriented in opposite directions (see reference). Figure 4 and Figure 5 ).

[0027] The air-cooled structure provided in this embodiment, compared with the prior art, allows external airflow to enter the motor through the air guide 6 and through hole 31 on one end cover 3 when the outer rotor structure 1 is rotating, and to exit through the through hole 31 and air guide 6 on the other end cover 3. This makes the ventilation inside the motor more uniform, avoids the problem of local overheating, and realizes self-circulating air cooling without the need for an additional fan. This not only simplifies the motor structure, but also reduces energy consumption, noise and failure risk.

[0028] Since the air inlets 6 on the two end caps 3 face opposite directions, when the outer rotor structure 1 rotates forward, one set of air inlets 6 in the self-circulating assembly becomes an air inlet because the opening direction matches the rotation direction, while the other set becomes an air outlet because the opening direction is opposite. When the outer rotor structure 1 rotates in reverse, the air intake and exhaust states are automatically switched, ensuring that the air-cooling structure can always maintain effective airflow circulation and continuously dissipate heat from the inside of the motor when the motor is running in alternating forward and reverse directions. This ensures the heat dissipation stability of the motor under bidirectional operating conditions and enhances the motor's adaptability to complex working scenarios.

[0029] like Figures 2 to 3 As shown, based on the first embodiment, this utility model provides another specific embodiment as follows: The ventilation cap 4 includes an outer cap body 41, an inner cylinder body 42, and a limiting ring plate 43; the outer cap body 41 is located outside the end cap 3, and the air guide 6 is located on the outer cap body 41; the inner cylinder body 42 is connected to the outer cap body 41 and is used to insert into the through hole 31, and the protective net 5 is installed inside the inner cylinder body 42; the limiting ring plate 43 is fixed between the outer cap body 41 and the inner cylinder body 42, and the outer diameter of the limiting ring plate 43 is larger than the diameter of the through hole 31.

[0030] The outer cap 41, located outside the end cover 3, guides the airflow to the inner cylinder 42 through the air guide port 6, and then enters the motor from the inner cylinder 42. The inner cylinder 42 is inserted into the through hole 31, which improves the stability of the outer cap 41. The limiting ring plate 43 can limit the inner cylinder 42 when it is inserted into the through hole 31, improve the installation efficiency of the ventilation cap 4, and also increase the connection stability between the ventilation cap 4 and the end cover 3.

[0031] like Figure 3 As shown, based on the first embodiment, this utility model provides another specific embodiment as follows: The air-cooled structure also includes multiple protective nets 5, which correspond one-to-one with the ventilation caps 4 and are installed inside the ventilation caps 4. The protective nets 5 are used to isolate the air vents 6 from the internal space of the outer rotor structure 1.

[0032] The protective net 5 can effectively block external dust, impurities, moisture and other contaminants from entering the motor, further improving the safety of the motor during operation.

[0033] like Figure 3 As shown, based on the first embodiment, this utility model provides another specific embodiment as follows: The outer cap body 41 is set in a hemispherical shape.

[0034] The hemispherical outer cap 41 can better adapt to the characteristics of airflow and reduce the resistance of airflow when entering the ventilation cap 4. Furthermore, the hemispherical outer cap 41 can make the airflow more evenly distributed inside the ventilation cap 4, avoiding airflow turbulence and local blockage, further enhancing the ventilation performance of the air-cooled structure and helping to improve the heat dissipation effect of the motor.

[0035] like Figure 3 As shown, based on the first embodiment, this utility model provides another specific embodiment as follows: The opening shape of the air vent 6 is roughly circular.

[0036] The near-circular opening shape allows air to enter the ventilation cap 4 more smoothly, reducing abrupt changes and eddies in airflow. Compared to openings of other shapes, the near-circular opening guides airflow better into the ventilation cap 4, making the airflow within the ventilation cap 4 more stable and uniform. This helps improve the efficiency of air entering the motor, thereby enhancing the heat dissipation effect of the air-cooled structure.

[0037] like Figure 2 As shown, based on the first embodiment, this utility model provides another specific embodiment as follows: The limiting ring plate 43 and the end cover 3 are detachably fixed by multiple screws.

[0038] During motor maintenance and repair, if the ventilation cap 4 malfunctions or requires cleaning, it can be easily removed from the end cover 3 for appropriate processing, improving the maintainability of the air-cooled structure and reducing maintenance costs and time. Simultaneously, the screw fixing method provides sufficient connection strength, ensuring that the ventilation cap 4 will not loosen or fall off during motor operation, thus guaranteeing the stability and reliability of the air-cooled structure.

[0039] like Figure 2 As shown, based on the first embodiment, this utility model provides another specific embodiment as follows: An annular gasket is provided between the limiting ring plate 43 and the end cover 3.

[0040] The annular gasket acts as a seal, preventing air from leaking out from the gap between the limiting ring plate 43 and the end cover 3. This ensures that all the air entering through the ventilation cap 4 can effectively enter the motor, improving ventilation efficiency and enhancing the cooling effect. Simultaneously, the annular gasket also acts as a buffer, reducing direct contact and friction between the limiting ring plate 43 and the end cover 3, thus reducing noise and wear caused by vibration and friction.

[0041] like Figure 2 and Figure 6 As shown, based on the first embodiment, this utility model provides another specific embodiment as follows: The air-cooled structure also includes multiple ventilation holes, which are set on the stator support 22 in the inner stator structure 2 and opened along the axial direction of the inner stator structure 2.

[0042] The ventilation holes provide an additional airflow channel inside the motor, allowing air to flow more fully in the inner stator structure 2. Combined with the gap between the permanent magnet 12 and the stator core 23, this further improves the air-cooling effect of the motor.

[0043] like Figure 2As shown, based on the first embodiment, this utility model provides another specific embodiment as follows: The gap between the permanent magnet 12 in the outer rotor structure 1 and the stator core 23 in the inner stator structure 2 is defined as the first air-cooling channel 7, and the ventilation hole located on the same axis is defined as the second air-cooling channel 8; the radial position of the ventilation cap 4 is located between the first air-cooling channel 7 and the second air-cooling channel 8.

[0044] When airflow enters the motor through the ventilation cap 4, it can be simultaneously diverted to the first air-cooling channel 7 and the second air-cooling channel 8, allowing the airflow to cover the two channels more efficiently. When the airflow exits from the channel, it can also more smoothly converge back to the ventilation cap 4 and exit outside the motor, reducing the resistance and loss of airflow during the flow process, improving the efficiency of air circulation, ensuring that both air-cooling channels can obtain sufficient airflow, thereby enhancing the overall air-cooling effect.

[0045] like Figure 6 As shown, based on the first embodiment, this utility model provides another specific embodiment as follows: The second air-cooling channel 8 is distributed in a circle on the stator support 22.

[0046] When air enters the second air-cooling channel 8 through the ventilation cap 4, due to the circumferential distribution, the air can circulate evenly in all parts of the stator support 22, effectively carrying away the heat generated by the inner stator structure 2. This avoids the problem of uneven local heat dissipation, making the temperature distribution of the inner stator structure 2 more uniform and improving the heat dissipation effect and stability of the inner stator structure 2.

[0047] like Figure 5 and Figure 6 As shown, based on the first embodiment, this utility model provides another specific embodiment as follows: The number and spacing angle of the second air-cooling channel 8 and the ventilation cap 4 are consistent.

[0048] When the motor is running, air enters through the ventilation cap 4. Due to the consistency in quantity and spacing angle, the air can enter each of the second air-cooling channels 8 with a relatively uniform flow rate and speed. This makes the airflow in the inner stator structure 2 more uniform and stable, avoiding the problem of poor heat dissipation in some second air-cooling channels 8 due to insufficient airflow, and improving the ventilation uniformity and heat dissipation efficiency of the entire air-cooling structure.

[0049] like Figure 1 As shown, based on the same inventive concept, the second embodiment of the present invention provides an external rotor permanent magnet motor, including the above-mentioned air-cooling structure.

[0050] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

[0051] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0052] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

Claims

1. A wind cooling structure for mounting on an outer rotor permanent magnet motor, said outer rotor permanent magnet motor comprising an outer rotor structure (1), an inner stator structure (2) and two end covers (3); characterized in that, The air-cooling structure includes: Two sets of through holes (31) are respectively opened on the two end caps (3); each set of through holes (31) has multiple holes spaced apart circumferentially along the end cap (3); and Two sets of ventilation caps (4) correspond one-to-one with two sets of through holes (31); each set of ventilation caps (4) has multiple ones distributed at intervals along the circumference of the end cap (3) and covers the periphery of the corresponding through hole (31); Among them, the ventilation caps (4) of the same group are provided with air guides (6) facing the same rotation direction, and the air guides (6) of the two groups are oriented in opposite directions.

2. The air-cooled structure of claim 1, wherein The ventilation cap (4) includes: The outer cap (41) is located outside the end cap (3), and the air vent (6) is located on the outer cap (41); The inner cylinder (42) is connected to the outer cap (41) and is used to insert into the through hole (31); and A limiting ring plate (43) is fixed between the outer cap body (41) and the inner cylinder body (42), and the outer diameter of the limiting ring plate (43) is larger than the diameter of the through hole (31).

3. A wind turbine according to claim 1 or 2, wherein the wind turbine is a wind turbine according to any one of claims 3 to 16. The air-cooling structure also includes: Multiple protective nets (5) correspond one-to-one with the ventilation cap (4) and are installed inside the ventilation cap (4). The protective nets (5) are used to separate the air vent (6) from the internal space of the outer rotor structure (1).

4. The air-cooled structure of claim 2, wherein The outer cap (41) is hemispherical.

5. The air-cooled structure of claim 2, wherein The limiting ring plate (43) is detachably connected to the end cap (3).

6. The air-cooled structure as described in claim 5, characterized in that, An annular gasket is provided between the limiting ring plate (43) and the end cap (3).

7. The air-cooled structure of claim 1, wherein The air-cooling structure also includes: Multiple ventilation holes are provided on the stator support (22) in the inner stator structure (2) and are opened along the axial direction of the inner stator structure (2).

8. A wind turbine according to claim 7, wherein the wind turbine is a wind turbine according to any one of claims 1 to 6. The gap between the permanent magnet (12) in the outer rotor structure (1) and the stator core (23) in the inner stator structure (2) is defined as the first air-cooling channel (7), and the ventilation hole located on the same axis is defined as the second air-cooling channel (8); the radial position of the ventilation cap (4) is located between the first air-cooling channel (7) and the second air-cooling channel (8).

9. An air-cooled structure as claimed in claim 8, wherein The second air-cooling channel (8) is distributed in a circle on the stator support (22), and the number of the second air-cooling channel (8) and the ventilation cap (4) are consistent with the interval angle.

10. An external rotor permanent magnet electric machine characterized by, Includes the air-cooled structure as described in any one of claims 1-9.

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