Surface-mounted permanent magnet structure of outer rotor permanent magnet motor

Abstract

The utility model discloses a kind of surface-mounted permanent magnet structure of outer rotor permanent magnet motor, it is related to the technical field of outer rotor permanent magnet motor, including magnetic conductive ring, multiple permanent magnet main bodies being arranged in the inner side of magnetic conductive ring and the flow guide disc being integrally arranged with magnetic conductive ring, the air duct and multiple air holes are opened in the flow guide disc, the one end welding connection of flow guide disc has cover plate, the one side of flow guide disc is equipped with mounting groove. In the utility model, when flow guide disc rotates, air duct introduces external air to form the airflow that penetrates magnetic conductive ring, air hole auxiliary exhaust, cooperate with the composite heat dissipation layer of nanometer aluminium oxide and graphene, significantly enhance motor heat dissipation efficiency, prevent permanent magnet main body demagnetization due to high temperature, by the alignment cooperation of positioning block and positioning groove, ensure the coaxiality of shaft body and flow guide disc when installation, the double fixing effect of limit ring and nut, avoid loosening or shifting of shaft body in operation, improve structural stability.

Description

Technical Field

[0001] This utility model relates to the field of external rotor permanent magnet motor technology, specifically a surface-mounted permanent magnet structure for an external rotor permanent magnet motor. Background Technology

[0002] As one of the main structural components of an external rotor permanent magnet motor, the permanent magnet is attached to the rotor of the motor using various fixing methods. The bonding strength of the permanent magnet is greatly affected by high temperatures, specifically: high temperatures can cause demagnetization of the permanent magnet, which significantly degrades the motor's performance. Since the application range of external rotor permanent magnet motors is becoming increasingly wide, and these motors (especially high-power permanent magnet motors) have relatively high requirements for motor performance and temperature rise control, the performance of the permanent magnet in an external rotor permanent magnet motor is one of the key factors determining the motor's performance.

[0003] Existing permanent magnets are not easy to use while ensuring heat dissipation and stable installation. Most of them have unreasonable heat dissipation duct designs, resulting in poor air circulation and excessive motor temperature rise, which can easily cause permanent magnets to demagnetize due to high temperature.

[0004] Based on this, a surface-mounted permanent magnet structure for an external rotor permanent magnet motor is provided, which can eliminate the drawbacks of existing devices. Utility Model Content

[0005] The purpose of this invention is to provide a surface-mounted permanent magnet structure for an external rotor permanent magnet motor, so as to solve the problem in the prior art that it is not easy to achieve stable installation of the structure while ensuring heat dissipation.

[0006] To achieve the above objectives, this utility model provides the following technical solution: A surface-mounted permanent magnet structure for an external rotor permanent magnet motor includes a magnetic ring, multiple permanent magnet bodies disposed inside the magnetic ring, and a flow guide plate integrated with the magnetic ring. The flow guide plate has air ducts and multiple air holes. A cover plate is welded to one end of the flow guide plate. A mounting groove is provided on one side of the flow guide plate. A shaft is installed inside the mounting groove. A threaded post is provided at one end of the shaft. One end of the threaded post passes through the cover plate and is threadedly connected to a nut.

[0007] Based on the above technical solutions, this utility model also provides the following optional technical solutions: In one alternative: the inner wall of the mounting groove is provided with multiple positioning grooves at equal intervals in a ring, and positioning blocks are slidably installed inside each of the multiple positioning grooves, and the multiple positioning blocks are integrated with the shaft.

[0008] In one alternative: a limiting ring is provided on the outside of the shaft and at one end of the positioning block.

[0009] In one alternative: the guide plate includes a base layer, and the surface of the base layer is sequentially provided with an anti-rust layer, a heat dissipation layer and a wear-resistant layer.

[0010] In one alternative: the anti-rust layer is a zinc-aluminum composite coating.

[0011] In one alternative: the heat dissipation layer is a composite coating of nano-alumina and graphene.

[0012] In one alternative: the wear-resistant layer is a tungsten carbide coating.

[0013] In one alternative: the air ducts of the guide plate are radially distributed, and the air holes are circular through holes, uniformly surrounding the air ducts.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. When the guide plate of this utility model rotates, the air duct introduces external air to form an airflow that penetrates the magnetic ring, and the air hole assists in exhaust. Combined with the composite heat dissipation layer of nano-alumina and graphene, it significantly enhances the heat dissipation efficiency of the motor and prevents the permanent magnet body from demagnetizing due to high temperature.

[0015] 2. This utility model ensures the coaxiality of the shaft and the guide plate during installation by aligning the positioning block and the positioning groove. The double fixing effect of the limit ring and the nut prevents the shaft from loosening or shifting during operation, thus improving the structural stability. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall internal structure of this utility model.

[0017] Figure 2 This is a schematic diagram of the mechanism structure of this utility model.

[0018] Figure 3 This is a schematic diagram of the mechanism structure of this utility model.

[0019] Figure 4 This is a schematic diagram of the mechanism structure of this utility model.

[0020] Figure label annotations: 1. Magnetic guide ring; 2. Permanent magnet body; 3. Guide plate; 31. Base layer; 32. Anti-rust layer; 33. Heat dissipation layer; 34. Wear-resistant layer; 4. Air duct; 5. Air hole; 6. Cover plate; 7. Shaft; 8. Threaded column; 9. Nut; 10. Mounting groove; 11. Positioning groove; 12. Positioning block; 13. Limiting ring. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0022] In one embodiment, such as Figures 1-4 As shown, a surface-mounted permanent magnet structure for an external rotor permanent magnet motor includes a magnetic ring 1, multiple permanent magnet bodies 2 disposed inside the magnetic ring 1, and a guide plate 3 integrally formed with the magnetic ring 1. The guide plate 3 has air ducts 4 and multiple air holes 5. A cover plate 6 is welded to one end of the guide plate 3. An installation groove 10 is provided on one side of the guide plate 3. A shaft 7 is installed inside the installation groove 10. A threaded post 8 is provided at one end of the shaft 7. One end of the threaded post 8 passes through the cover plate 6 and is threadedly connected to a nut 9. The air ducts 4 of the guide plate 3 are radially distributed, and the air holes 5 are circular through holes, evenly surrounding the air ducts 4.

[0023] In this embodiment, when the guide plate 3 rotates, the air duct 4 introduces external air to form an airflow that penetrates the magnetic ring 1, and the air hole 5 assists in exhaust. Combined with the nano-alumina and graphene composite heat dissipation layer 33, the heat dissipation efficiency of the motor is significantly enhanced, and the permanent magnet body 2 is prevented from demagnetizing due to high temperature. The alignment of the positioning block 12 and the positioning groove 11 ensures the coaxiality of the shaft 7 and the guide plate 3 during installation. The dual fixing effect of the limiting ring 13 and the nut 9 prevents the shaft 7 from loosening or shifting during operation, thereby improving the structural stability.

[0024] In one embodiment, such as Figure 1 and Figure 3 As shown, the inner wall of the mounting groove 10 is provided with multiple positioning grooves 11 at equal intervals. Positioning blocks 12 are slidably installed inside each of the multiple positioning grooves 11. The multiple positioning blocks 12 are integrated with the shaft body 7. A limiting ring 13 is provided on the outside of the shaft body 7 at one end of the positioning block 12. Align one end of the shaft body 7 with the mounting groove 10 so that the positioning block 12 on the shaft body 7 is aligned with the positioning groove 11 on the inner wall of the mounting groove 10. Then, the shaft body 7 is inserted into the mounting groove 10. The positioning block 12 slides along the positioning groove 11 until the limiting ring 13 on the outside of the shaft body 7 contacts the guide plate 3. At this time, the threaded post 8 of the shaft body 7 extends to the outside through the cover plate 6. The nut 9 is threadedly connected to the threaded post 8 and tightened. With the cooperation of the limiting ring 13, the shaft body 7 and the guide plate 3 are stably fixed.

[0025] In one embodiment, such as Figure 1 and Figure 3As shown, the guide plate 3 includes a base layer 31. The surface of the base layer 31 is sequentially provided with an anti-rust layer 32, a heat dissipation layer 33, and a wear-resistant layer 34. The anti-rust layer 32 is a zinc-aluminum composite coating, the heat dissipation layer 33 is a nano-alumina and graphene composite coating, and the wear-resistant layer 34 is a tungsten carbide coating. The zinc-aluminum composite anti-rust layer 32 effectively resists rust in humid environments, and the tungsten carbide wear-resistant layer 34 enhances the wear resistance of the guide plate 3 surface.

[0026] The above embodiment discloses a surface-mount permanent magnet structure for an external rotor permanent magnet motor. One end of the shaft 7 is aligned with the mounting groove 10, and the positioning block 12 on the shaft 7 is aligned with the positioning groove 11 on the inner wall of the mounting groove 10. The shaft 7 is then inserted into the mounting groove 10, and the positioning block 12 slides along the positioning groove 11 until the limiting ring 13 on the outside of the shaft 7 contacts the guide plate 3. At this time, the threaded post 8 of the shaft 7 extends through the cover plate 6 to the outside. The nut 9 is threadedly connected to the threaded post 8 and tightened. Through the cooperation of the limiting ring 13, the shaft 7 and the guide plate 3 are stably fixed. When the motor is working, the magnetic ring 1 drives the integrated guide plate 3 to rotate synchronously. During the rotation of the guide plate 3, external air enters the interior of the guide plate 3 through the radially distributed air ducts 4, and then flows into the interior of the magnetic ring 1 to form a heat dissipation airflow. Some air is discharged outward through the circular air holes 5 surrounding the air ducts 4. At the same time, the anti-rust layer 32, heat dissipation layer 33, and wear-resistant layer 34 on the surface of the guide plate 3 play the roles of rust prevention, heat dissipation enhancement, and wear resistance improvement, respectively, to ensure the efficient and stable operation of the motor.

[0027] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A surface-mounted permanent magnet structure for an external rotor permanent magnet motor, comprising a magnetic ring (1), a plurality of permanent magnet bodies (2) disposed inside the magnetic ring (1), and a flow guide disk (3) integrally formed with the magnetic ring (1), characterized in that: The guide plate (3) is provided with an air duct (4) and multiple air holes (5). A cover plate (6) is welded to one end of the guide plate (3). An installation groove (10) is provided on one side of the guide plate (3). A shaft (7) is installed inside the installation groove (10). A threaded post (8) is provided at one end of the shaft (7). One end of the threaded post (8) passes through the cover plate (6) and is threadedly connected to a nut (9).

2. The surface-mounted permanent magnet structure of an external rotor permanent magnet motor according to claim 1, characterized in that, The inner wall of the mounting groove (10) is provided with multiple positioning grooves (11) at equal intervals in a ring. Positioning blocks (12) are slidably installed inside the multiple positioning grooves (11). The multiple positioning blocks (12) and the shaft (7) are integrated together.

3. The surface-mounted permanent magnet structure of an external rotor permanent magnet motor according to claim 2, characterized in that, A limit ring (13) is provided on the outside of the shaft (7) and at one end of the positioning block (12).

4. The surface-mounted permanent magnet structure of an external rotor permanent magnet motor according to claim 1, characterized in that, The guide plate (3) includes a base layer (31), and the surface of the base layer (31) is sequentially provided with an anti-rust layer (32), a heat dissipation layer (33) and a wear-resistant layer (34).

5. The surface-mounted permanent magnet structure of an external rotor permanent magnet motor according to claim 4, characterized in that, The rust-proof layer (32) is a zinc-aluminum composite coating.

6. The surface-mounted permanent magnet structure of an external rotor permanent magnet motor according to claim 4, characterized in that, The heat dissipation layer (33) is a composite coating of nano-alumina and graphene.

7. The surface-mounted permanent magnet structure of an external rotor permanent magnet motor according to claim 4, characterized in that, The wear-resistant layer (34) is a tungsten carbide coating.

8. The surface-mounted permanent magnet structure of an external rotor permanent magnet motor according to claim 1, characterized in that, The air ducts (4) of the guide plate (3) are radially distributed, and the air holes (5) are circular through holes that are evenly surrounding the air ducts (4).

Images