A heat dissipation device for a permanent magnet motor

Abstract

The utility model belongs to motor field especially relates to a permanent magnet motor heat abstractor, including permanent magnet motor body, the tail end of permanent magnet motor body is equipped with baffle, and the baffle is opened and has the air outlet, is detachably equipped with the dust cover through bolt in the baffle, and the dust cover is located in the permanent magnet motor body and is equipped with the first fan on the pivot. Dust cover is equipped with the heat abstractor that carries out heat dissipation to permanent magnet motor body. The heat abstractor includes the transmission part in the dust cover and the second fan in the dust cover through support, and the pivot of permanent magnet motor body is connected with the second fan. The utility model connects the pivot with the second fan through the transmission part, and the setting can improve the rotational speed of the second fan of transmission part, even if the rotational speed of the pivot is reduced, the power of the pivot can also drive the second fan to realize the speed higher than the rotational speed of the pivot through the transmission part, so that the second fan still has the good heat dissipation effect to the permanent magnet motor body.

Description

Technical Field

[0001] This utility model belongs to the field of electric motors, and in particular relates to a heat dissipation device for permanent magnet electric motors. Background Technology

[0002] Permanent magnet motors are widely used in industrial drives, new energy vehicles, aerospace, and other fields due to their high power density, high efficiency, and excellent speed regulation performance. However, the copper losses, iron losses, and mechanical losses generated during motor operation are converted into heat, causing the internal temperature of the motor to rise. Excessive temperature rise will reduce the motor's operating efficiency, reliability, and service life. To cool it down, a common air-cooling structure is to install a built-in cooling fan at one end of the motor shaft. This fan rotates coaxially with the motor rotor, and its speed is synchronized with the motor shaft speed. When the motor is operating at low speed or under heavy load, the speed of the cooling fan also decreases synchronously due to the reduction in motor speed, resulting in a sharp decrease in the air volume and air pressure provided, and a significant reduction in heat dissipation capacity. Utility Model Content

[0003] The purpose of this utility model is to provide a heat dissipation device for a permanent magnet motor to solve the technical problems mentioned in the background art.

[0004] To achieve the above objectives, the specific technical solution of this utility model for a heat dissipation device for a permanent magnet motor is as follows: A heat dissipation device for a permanent magnet motor includes a permanent magnet motor body. A baffle with an air outlet is located at the tail end of the permanent magnet motor body. A dust cover is detachably mounted on the baffle via bolts. A first fan is mounted on the shaft of the permanent magnet motor body inside the dust cover. The dust cover is cylindrical, with multiple air inlets at its bottom end. A heat dissipation device for cooling the permanent magnet motor body is located inside the dust cover. The heat dissipation device includes a transmission unit located inside the dust cover and a second fan mounted inside the dust cover via a bracket. The shaft of the permanent magnet motor body is connected to the second fan, and the transmission unit increases the rotational speed of the second fan.

[0005] Furthermore, the bracket includes two fixed rods housed within a dust cover, with the free ends of the two fixed rods connected by a connecting ring. The second fan includes a fan shaft rotatably disposed within the connecting ring, on which multiple fan blades are obliquely mounted. The fan shaft and the rotating shaft are coaxially arranged.

[0006] Furthermore, the transmission unit includes multiple connecting rods arranged radially along the shaft, with the free ends of each connecting rod connected via an internal gear ring. A second gear is located at one end of the fan shaft, and a first gear is rotatably mounted on a fixed rod via a support shaft. The internal gear ring meshes with the second gear through the first gear. The blades of the first fan and the blades of the second fan have opposite tilt angles.

[0007] Furthermore, the dust cover is equipped with a wind speed enhancement component, which includes a partition between the transmission unit and the first fan, and multiple cooling cylinders are distributed along the axial direction of the partition. The cooling cylinders are hollow cone-shaped.

[0008] Furthermore, the diameter of the cooling cylinder facing the first fan is smaller than the diameter of the other end.

[0009] The heat dissipation device for a permanent magnet motor of this invention has the following advantages: This invention connects the rotating shaft to the second fan via a transmission unit. The transmission unit can increase the speed of the second fan. Even if the speed of the rotating shaft decreases, the power of the rotating shaft can still drive the second fan to a speed higher than the speed of the rotating shaft through the transmission unit, so that the second fan can still have a good heat dissipation effect on the permanent magnet motor body. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of a heat dissipation device for a permanent magnet motor according to the present invention. Figure 2 This is a schematic diagram of the dust cover, transmission part, first fan and second fan of this utility model; Figure 3 This is a schematic diagram of the transmission part and the second fan of this utility model.

[0011] Explanation of markings in the diagram: 1. Permanent magnet motor body; 2. Dust cover; 3. Air inlet; 4. Shaft; 5. First fan; 6. Partition plate; 7. Cooling cylinder; 8. Internal gear ring; 9. Connecting rod; 10. First gear; 11. Support shaft; 12. Second gear; 13. Fan shaft; 14. Fan blade; 15. Fixing rod; 16. Connecting ring; 17. Air outlet. Detailed Implementation

[0012] To better understand the purpose, structure, and function of this utility model, the following description, in conjunction with the accompanying drawings, provides a more detailed account of a heat dissipation device for a permanent magnet motor.

[0013] like Figures 1 to 3As shown, this utility model discloses a heat dissipation device for a permanent magnet motor, comprising a permanent magnet motor body 1. A baffle is provided at the tail end of the permanent magnet motor body 1, and an air outlet 17 is provided on the baffle. A dust cover 2 is detachably mounted on the baffle via bolts, and a first fan 5 is mounted inside the dust cover 2 on the rotating shaft 4 of the permanent magnet motor body 1. The dust cover 2 is cylindrical, and multiple air inlets 3 are provided at its bottom end. When the permanent magnet motor body 1 starts, its rotating shaft 4 rotates accordingly, and the first fan 5, fixedly mounted on the rotating shaft 4, rotates synchronously. Under the suction force of the first fan 5, cooling air from the external environment is drawn in through the multiple air inlets 3 at the end of the dust cover 2 and blown onto the heat sink on the permanent magnet motor body 1 through the air outlet 17 of the baffle. The heat dissipation effect on the permanent magnet motor body 1 is achieved through heat exchange between the cold air and the heat sink. It should be noted that the air outlets 17 are all set to correspond to the gaps between adjacent heat sinks on the permanent magnet motor body 1, so that the cold air blown out from the air outlets 17 can better carry away the heat on the heat sinks to achieve good heat exchange.

[0014] The dust cover 2 and the baffle are detachably connected by bolts to facilitate the cleaning of dust accumulated inside the dust cover 2 in the future. It also facilitates the cleaning and maintenance of the first fan 5 inside the dust cover 2, ensuring smooth air intake and normal operation of the permanent magnet motor body 1.

[0015] Preferably, the dust cover 2 is equipped with a heat dissipation device for cooling the permanent magnet motor body 1. The heat dissipation device can provide good cooling even when the permanent magnet motor body 1 is rotating at low speed. Specifically, the heat dissipation device includes a transmission unit located inside the dust cover 2 and a second fan mounted inside the dust cover 2 via a bracket. The rotating shaft 4 of the permanent magnet motor is connected to the second fan, and the transmission unit increases the speed of the second fan. The bracket consists of two fixed rods 15 located inside the dust cover 2 and connecting rings 16 located at the free ends of the two fixed rods 15. The second fan consists of a fan shaft 13 rotatably mounted within the connecting ring 16 and multiple fan blades 14 distributed on the fan shaft 13. The fan shaft 13 is coaxial with the rotating shaft 4, and the fan blades 14 are inclined relative to the fan shaft 13.

[0016] The transmission unit for connecting the rotating shaft 4 and the second fan includes multiple connecting rods 9 arranged radially along the rotating shaft 4, with the free ends of each connecting rod 9 connected by an internal gear ring 8. A second gear 12 is provided at one end of the fan shaft 13, and a first gear 10 is rotatably provided on the fixed rod 15 via a support shaft 11. The internal gear ring 8 meshes with the second gear 12 through the first gear 10. In this embodiment, the combination of the internal gear ring 8, the first gear 10, and the second gear 12 amplifies the low speed of the rotating shaft 4 to the high speed of the second fan shaft 13. This ensures that when the permanent magnet motor body 1 is in a low-speed, high-heat operating condition, the second fan can still provide a speed higher than that of the permanent magnet motor body 1, providing ample cooling airflow to cool it down. In use, the permanent magnet motor body 1 is started, and its rotating shaft 4 begins to rotate. The rotating shaft 4 drives multiple radially arranged connecting rods 9 to rotate synchronously, which in turn drives the internal gear ring 8 to rotate. The internal gear ring 8 drives the first gear 10, which meshes with it, to rotate in the opposite direction. The first gear 10 drives the second gear 12, which meshes with it, and the second gear 12 drives the second fan connected to it to rotate. The first gear 10 acts as an idler gear between the second gear 12 and the internal gear ring 8, so that the internal gear ring 8, as a large gear, drives the smaller second gear 12 to rotate, thereby allowing the second fan to generate a higher speed. Since the first gear 10 acts as an idler gear, the rotation directions of the internal gear ring 8 and the second gear 12 are opposite, that is, the rotation directions of the first fan 5 and the second fan are opposite. Therefore, in this embodiment, the tilt angles of the blades 14 of the first fan 5 and the blades 14 of the second fan are set to be opposite. This is so that when the second fan rotates, it can also produce the effect of blowing air onto the first fan 5.

[0017] As another preferred embodiment, the dust cover 2 is equipped with a wind speed enhancement component, which includes a partition 6 located between the transmission part and the first fan 5, and multiple cooling cylinders 7 are distributed along the axial direction of the partition 6. The cooling cylinders 7 are hollow cones. The diameter of the end of the cooling cylinder 7 facing the first fan 5 is smaller than the diameter of the other end. The cold air generated by the second fan blows directly onto the partition 6, and the cold air reaching the partition 6 passes through the cooling cylinders 7. The airflow ejected through the cooling cylinders 7 has its velocity increased, and the increased airflow blows towards the end of the permanent magnet motor body 1. Then, with the cooperation of the first fan 5, the cold airflow is ejected through the air outlet 17 of the baffle. The high-velocity cold airflow further improves the heat exchange efficiency with the heat sink and the heat dissipation effect on the permanent magnet motor body 1. At the same time, the airflow generated by the second fan is accelerated and focused into multiple regular high-speed jets when passing through the cooling cylinders 7. These jets, upon impacting the blades of the first fan 5, not only provide high-quality airflow to the first fan 5, reducing its workload, but also extend its service life.

[0018] Working principle: When the permanent magnet motor is working, its rotating shaft 4 drives the first fan 5 to rotate, and the second fan, driven by the transmission unit, also rotates. Both the first and second fans generate suction, drawing in airflow from outside the dust cover 2. The second fan, under the action of the rotating shaft 4 and the transmission unit, increases its speed. The airflow generated by the second fan is accelerated again by the cooling cylinder 7 and blown directly onto the first fan 5 to reduce its load. The first fan 5 then blows this airflow towards the air outlet 17 of the baffle and discharges it through the outlet 17, completing the heat exchange and cooling of the heat sink.

[0019] It is understood that this utility model has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of this utility model. Furthermore, under the teachings of this utility model, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of this utility model.

Claims

1. A heat dissipation device for a permanent magnet motor, characterized in that: Includes a permanent magnet motor body (1), the tail end of the permanent magnet motor body (1) is provided with a baffle, and an air outlet (17) is opened on the baffle. A dust cover (2) is provided on the baffle by bolts, and a first fan (5) is provided on the rotating shaft (4) of the permanent magnet motor body (1) inside the dust cover (2). The dust cover (2) is cylindrical, and the bottom of the dust cover (2) has multiple air inlets (3). The dust cover (2) is equipped with a heat dissipation device for cooling the permanent magnet motor body (1); The heat dissipation device includes a transmission unit located inside the dust cover (2) and a second fan located inside the dust cover (2) via a bracket. The shaft (4) of the permanent magnet motor body (1) is connected to the second fan, and the speed of the second fan is increased through the transmission unit.

2. The heat dissipation device for a permanent magnet motor according to claim 1, characterized in that: The bracket includes two fixed rods (15) disposed inside the dust cover (2), and the free ends of the two fixed rods (15) are connected by a connecting ring (16); The second fan includes a fan shaft (13) that is rotatably disposed within a connecting ring (16), and multiple fan blades (14) that are inclinedly disposed on the fan shaft (13). The fan shaft (13) and the rotating shaft (4) are set coaxially.

3. A heat dissipation device for a permanent magnet motor according to claim 1 or 2, characterized in that: The transmission unit includes multiple connecting rods (9) arranged radially along the rotating shaft (4). The free ends of each connecting rod (9) are connected by an internal gear ring (8). A second gear (12) is provided at one end of the fan shaft (13), and a first gear (10) is rotatably provided on the fixed rod (15) through a support shaft (11). The internal gear ring (8) meshes with the second gear (12) through the first gear (10). The blades (14) of the first fan (5) are tilted at opposite angles to the blades (14) of the second fan.

4. A heat dissipation device for a permanent magnet motor according to claim 3, characterized in that: The dust cover (2) is provided with a wind speed enhancement component, and the wind speed enhancement component includes a partition (6) located between the transmission part and the first fan (5), and multiple cooling cylinders (7) are distributed on the partition (6) along its axial direction. The cooling cylinder (7) is a hollow cone.

5. A heat dissipation device for a permanent magnet motor according to claim 4, characterized in that: The diameter of the cooling cylinder (7) facing the first fan (5) is smaller than the diameter of the other end.

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