A heat dissipation structure of an outer rotor permanent magnet motor

Abstract

The utility model relates to outer rotor permanent magnet motor technical field, especially a kind of outer rotor permanent magnet motor heat dissipation structure. Including: outer rotor, inner stator core, middle shaft, excitation winding and heat dissipation component, heat dissipation component contains a pair of end cap being arranged at the both ends of outer rotor, each end cap is equipped with the ventilation opening being distributed along the circumference of middle shaft, and air deflector is equipped in mouth, air can be disturbed to form axial airflow when rotor rotates, outer rotor outer lateral wall is circumferentially equipped with multiple groups of flow guide radiating fin, each group is made of multiple fin plates being arranged in axial direction, air deflector and blade part of inclined fin plate are strengthened to strengthen forced air cooling, and the heat dissipation efficiency is improved;Ventilation opening is covered with fine-mesh screen to prevent impurities from entering;End cap is detachable design and is equipped with limit part, facilitate maintenance and improve assembly accuracy;Middle shaft and end cap are connected by bearing, reduce abrasion, ensure smooth operation.

Description

Technical Field

[0001] This utility model relates to the field of external rotor permanent magnet motor technology, and in particular to a heat dissipation structure for an external rotor permanent magnet motor. Background Technology

[0002] External rotor permanent magnet motors are widely used in fields such as fans, water pumps, auxiliary drive systems for new energy vehicles, and industrial transmission equipment due to their advantages such as high torque density, compact structure, and strong installation adaptability.

[0003] During motor operation, the iron losses in the inner stator core and the copper losses in the excitation winding continuously generate heat. If this heat cannot be dissipated in time, the internal temperature of the motor will rise. This will cause the magnetic properties of the permanent magnets to decay, reducing the motor's output efficiency. Furthermore, it will accelerate the aging of the winding insulation material, shortening the motor's lifespan, and in severe cases, even leading to winding burnout and rotor seizure. Therefore, a heat dissipation structure for external rotor permanent magnet motors is urgently needed to solve these problems. Utility Model Content

[0004] To overcome the shortcomings of the prior art, this utility model provides a heat dissipation structure for an external rotor permanent magnet motor, which solves the technical problems of low heat dissipation efficiency and inconvenient maintenance of existing external rotor permanent magnet motors.

[0005] To achieve the above objectives, this utility model is implemented through the following technical solution: A heat dissipation structure for an external rotor permanent magnet motor includes: an external rotor, an inner stator core, a central shaft, and an excitation winding. The excitation winding is wound on the inner stator core, the external rotor is sleeved on the outside of the inner stator core, and the central shaft passes through the inner stator core. A heat dissipation assembly includes: a pair of end caps, which are respectively covered on both ends of the outer rotor and respectively fitted onto the central shaft. Each end cap is provided with a set of ventilation openings, which are spaced apart circumferentially along the central shaft. Each ventilation opening is provided with a guide plate. When the outer rotor rotates, the guide plate is used to disturb the airflow outside the outer rotor, causing the airflow to move axially along the central shaft. Several sets of heat dissipation fins are arranged circumferentially along the central axis on the outer side wall of the outer rotor. Each set of heat dissipation fins includes several fins, which are arranged obliquely along the axial direction of the central axis.

[0006] Based on the above structure, the principle of the heat dissipation structure of the external rotor permanent magnet motor is as follows: when the external rotor rotates, it drives the air guide plate on the end cover to rotate together. The air guide plate, like fan blades, "pumps" air in from outside the external rotor, generating forced air cooling along the central axis, and dissipating heat from inside the motor. At the same time, the inclined fins not only increase the contact area between the motor and the air, but also further enhance the airflow disturbance, accelerating the transfer of heat generated inside the motor from the surface of the external rotor to the air, thereby improving heat dissipation efficiency.

[0007] Furthermore, in the heat dissipation structure of an external rotor permanent magnet motor of this application, both ends of the fins are provided with cutting edges. As a preferred embodiment of this application, in the heat dissipation structure of an external rotor permanent magnet motor of this application, when the external rotor rotates at high speed, the cutting edges are used to cut the airflow, so that the airflow can flow smoothly over the surface of the fins to carry away more heat and improve heat dissipation efficiency.

[0008] Furthermore, the heat dissipation structure for an external rotor permanent magnet motor in this application also includes a dense mesh filter, which is applied over the ventilation opening. As a preferred embodiment of this application, the dense mesh filter in the heat dissipation structure for an external rotor permanent magnet motor is used to prevent dust, impurities, and other debris in the air from being drawn into the motor through the ventilation opening, thus avoiding the accumulation of impurities inside the motor and causing internal damage.

[0009] Furthermore, in the heat dissipation structure of an external rotor permanent magnet motor of this application, the end cover is detachably mounted on the external rotor. As a preferred embodiment of this application, the heat dissipation structure of an external rotor permanent magnet motor of this application allows for easy removal of the end cover for operation when internal inspection, maintenance, or cleaning of the motor is required, reducing maintenance difficulty and cost.

[0010] Furthermore, in the heat dissipation structure for an external rotor permanent magnet motor of this application, the end cover near the external rotor is provided with a limiting part, which extends circumferentially along the central axis. When the end cover is installed on the external rotor, the limiting part abuts against the inner sidewall of the external rotor. As a preferred embodiment of this application, the heat dissipation structure for an external rotor permanent magnet motor of this application allows for end cover positioning by the limiting part abutting against the inner sidewall of the external rotor during assembly of the end cover and the external rotor, reducing assembly steps, shortening single assembly time, and improving assembly efficiency.

[0011] Furthermore, in the heat dissipation structure of an external rotor permanent magnet motor of this application, the end cover is detachably mounted on the external rotor. As a preferred embodiment of this application, the heat dissipation structure of an external rotor permanent magnet motor of this application allows for easy removal of the end cover for operation when internal inspection, maintenance, or cleaning of the motor is required, reducing maintenance difficulty and cost.

[0012] Furthermore, the heat dissipation structure for an external rotor permanent magnet motor in this application further includes: a pair of bearings, each pair of bearings being sleeved on the central shaft and mounted on a pair of end covers. As a preferred embodiment of this application, the bearings in the heat dissipation structure for an external rotor permanent magnet motor are used to reduce mechanical wear between the central shaft and the end covers, extending their service life; simultaneously, they ensure the coaxiality of the end covers and the central shaft, enabling the motor to operate efficiently and smoothly.

[0013] As can be seen from the above technical solution, this utility model has the following beneficial effects: The purpose of this utility model is to provide a heat dissipation structure for an external rotor permanent magnet motor. By setting an end cover with a guide plate and an inclined heat dissipation fin with a blade, the forced air cooling effect is enhanced and the heat dissipation efficiency is improved. By covering the ventilation opening with a fine mesh filter to prevent impurities from entering the motor, the removable end cover reduces the difficulty of maintenance, the end cover limiting part improves the assembly efficiency, and the bearing between the central shaft and the end cover reduces mechanical wear and ensures stable operation of the motor. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of a heat dissipation structure for an external rotor permanent magnet motor according to an embodiment of this application. Figure 2 This is a cross-sectional view of a heat dissipation structure for an external rotor permanent magnet motor according to an embodiment of this application; Figure 3 This is a three-dimensional structural diagram of the end cover in a heat dissipation structure for an external rotor permanent magnet motor according to an embodiment of this application.

[0015] In the diagram: 1-Outer rotor; 2-Inner stator core; 3-Central shaft; 4-Heat dissipation assembly; 41-End cover; 410-Ventilation port; 411-Limiting part; 42-Air guide plate; 43-Air guide heat dissipation fin; 431-Fin; 4310-Blade; 5-Dense mesh filter; 6-Bearing. Detailed Implementation

[0016] like Figure 1 , 2 As shown in Figures 1 and 3, a heat dissipation structure for an external rotor permanent magnet motor includes: an external rotor 1, an inner stator core 2, a central shaft 3, and an excitation winding. The excitation winding is wound on the inner stator core 2. The external rotor 1 is sleeved on the outside of the inner stator core 2, and the central shaft 3 passes through the inner stator core 2. The heat dissipation assembly 4 includes: a pair of end caps 41, which are respectively covered on both ends of the outer rotor 1 and respectively sleeved on the central shaft 3. Each end cap 41 is provided with a set of ventilation openings 410, which are spaced apart along the circumference of the central shaft 3. Each ventilation opening 410 is provided with a guide plate 42. When the outer rotor 1 rotates, the guide plate 42 is used to disturb the airflow outside the outer rotor 1, so that the airflow moves along the axial direction of the central shaft 3. Several sets of heat dissipation fins 43 are arranged at intervals along the circumference of the central axis 3 on the outer side wall of the outer rotor 1. Each set of heat dissipation fins 43 includes several fins 431, which are arranged at intervals along the axial direction of the central axis 3.

[0017] Based on the above structure, the principle of the heat dissipation structure for an external rotor permanent magnet motor is as follows: When the external rotor 1 rotates, it drives the air guide plate 42 on the end cover 41 to rotate together. The air guide plate 42, like a fan blade, "pumps" air in from outside the external rotor 1, generating forced airflow along the central axis 3 to dissipate heat inside the motor. At the same time, the inclined fins 431 not only increase the contact area between the motor and the air, but also further enhance the airflow disturbance, accelerating the transfer of heat generated inside the motor from the surface of the external rotor 1 to the air, thus improving heat dissipation efficiency. A set of flow-guiding heat dissipation fins 43 includes 3 fins 431, and several sets of flow-guiding heat dissipation fins 43 are evenly spaced along the circumference of the central axis 3 and several fins 431 are evenly spaced along the axial direction of the central axis 3.

[0018] In this embodiment, both ends of the fin 431 are provided with blades 4310. When the outer rotor 1 rotates at high speed, the blades 4310 are used to cut the airflow, so that the airflow can flow smoothly over the surface of the fin 431 to carry away more heat and improve heat dissipation efficiency.

[0019] This embodiment also includes a fine-mesh filter 5, which is applied over the vent 410. The fine-mesh filter 5 prevents dust, impurities, and other debris in the air from being drawn into the motor through the vent 410, thus avoiding the accumulation of impurities inside the motor and causing internal damage. The fine-mesh filter 5 can be made of fine-mesh nylon mesh.

[0020] In this embodiment, the end cover 41 is detachably mounted on the outer rotor 1. When it is necessary to inspect, repair, or clean the inside of the motor, the end cover 41 can be easily removed for operation, reducing maintenance difficulty and cost. The end cover 41 is detachably mounted on the outer rotor 1 by a set of screws (not shown).

[0021] In this embodiment, the end cap 41 is provided with a limiting part 411 on the side near the outer rotor 1. The limiting part 411 extends circumferentially along the central axis 3. When the end cap 41 is installed on the outer rotor 1, the limiting part 411 abuts against the inner sidewall of the outer rotor 1. When assembling the end cap 41 and the outer rotor 1, the end cap 41 can be positioned by the limiting part 411 abutting against the inner sidewall of the outer rotor 1, reducing assembly steps, shortening the single assembly time, and improving assembly efficiency.

[0022] In this embodiment, the end cover 41 is detachably mounted on the outer rotor 1. When it is necessary to inspect, repair, or clean the inside of the motor, the end cover 41 can be easily removed for operation, reducing maintenance difficulty and cost. The end cover 41 is detachably mounted on the outer rotor 1 by a set of screws (not shown).

[0023] In this embodiment, the system further includes a pair of bearings 6, which are respectively sleeved on the central shaft 3 and respectively mounted on a pair of end caps 41. The bearings 6 are used to reduce mechanical wear between the central shaft 3 and the end caps 41, extending their service life; at the same time, they ensure the coaxiality of the end caps 41 and the central shaft 3, enabling the motor to operate efficiently and smoothly. The bearings 6 can be ball bearings.

[0024] The technical principles of this utility model have been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of this utility model and should not be construed as limiting the scope of protection of this utility model in any way. Based on the explanation herein, those skilled in the art can conceive of other specific embodiments of this utility model without creative effort, and these embodiments will all fall within the scope of protection of this utility model.

Claims

1. A heat dissipation structure for an external rotor permanent magnet motor, characterized in that: include: The outer rotor (1), inner stator core (2), central shaft (3) and excitation winding are provided. The excitation winding is wound on the inner stator core (2). The outer rotor (1) is sleeved on the outside of the inner stator core (2). The central shaft (3) passes through the inner stator core (2). Heat dissipation assembly (4), the heat dissipation assembly (4) includes: a pair of end caps (41), the pair of end caps (41) are respectively covered on both ends of the outer rotor (1), the pair of end caps (41) are respectively sleeved on the central shaft (3), each end cap (41) is provided with a set of ventilation openings (410), the set of ventilation openings (410) are arranged circumferentially along the central shaft (3), each ventilation opening (410) is provided with: a guide plate (42), when the outer rotor (1) rotates, the guide plate (42) is used to disturb the airflow outside the outer rotor (1) so that the airflow moves along the axial direction of the central shaft (3); Several sets of heat dissipation fins (43) are arranged circumferentially along the central axis (3) on the outer side wall of the outer rotor (1). Each set of heat dissipation fins (43) includes several fins (431), which are arranged obliquely along the central axis (3).

2. The heat dissipation structure for an external rotor permanent magnet motor according to claim 1, characterized in that: Both ends of the fin (431) are provided with blades (4310).

3. The heat dissipation structure for an external rotor permanent magnet motor according to claim 1, characterized in that: Also includes: A fine mesh filter (5) is placed over the vent (410).

4. The heat dissipation structure for an external rotor permanent magnet motor according to claim 1, characterized in that: The end cap (41) is detachably mounted on the outer rotor (1).

5. The heat dissipation structure for an external rotor permanent magnet motor according to claim 1, characterized in that: The end cap (41) is provided with a limiting part (411) on the side near the outer rotor (1). The limiting part (411) extends along the circumference of the central axis (3). When the end cap (41) is installed on the outer rotor (1), the limiting part (411) abuts against the inner wall of the outer rotor (1).

6. The heat dissipation structure for an external rotor permanent magnet motor according to claim 1, characterized in that: The end cap (41) is detachably mounted on the outer rotor (1).

7. The heat dissipation structure for an external rotor permanent magnet motor according to claim 1, characterized in that: Also includes: A pair of bearings (6) are respectively sleeved on the central shaft (3) and the pair of bearings (6) are respectively installed on a pair of end caps (41).

Images