Outer rotor brushless motor

Abstract

The invention discloses an outer rotor brushless motor, which comprises a stator assembly, a motor shaft, a plurality of bearings, a rotor assembly and an end cover. The stator assembly is provided with a first annular boss, and an annular concave groove is arranged on the other side of the stator assembly. An annular convex groove is formed in the inner side of the bottom cover of the rotor assembly, and a first groove is formed in the inner side of the side wall thereof. The annular convex groove corresponds to the first annular boss. A second annular boss is arranged on the inner side of the end face of the end cover and a first boss is arranged on the edge thereof. The second annular boss corresponds to the annular concave groove. The first boss corresponds to the first groove. The bottom cover of the rotor assembly comprises a plurality of sets of first heat dissipation holes and a dust blocking plate. The dust blocking plate comprises a plurality of partition walls. According tothe invention, the connection parts of all components of an external rotor brushless motor disclosed by the invention are realized in the convex-concave butt joint manner, so that external foreign matters can be prevented from entering the motor and influencing the service life of the motor. The IP protection level is improved. Meanwhile, the space is fully utilized on all components to form a heat dissipation structure. The heat dissipation efficiency during operation is accelerated, and the service life is prolonged.

Description

technical field [0001] The invention relates to the technical field of motors, in particular to an outer rotor brushless motor. Background technique [0002] With the promotion of external rotor brushless motors, in some fields that require high IP protection level and heat dissipation, such as model aircraft, unmanned aerial vehicles and other products, the IP protection level and heat dissipation requirements of external rotor brushless motors continue to increase, in order to ensure Reliability of product operation. The current practice is to hollow out both ends of the motor to promote air circulation inside and outside, which can enhance heat dissipation, but this structure will make it easy for foreign matter to enter the motor from the hollow and pollute the bearings, and the IP protection level is not high. In order to prevent foreign matter from entering the motor, the two ends of the motor are closed, which will affect the heat dissipation effect. That is, the ex...

AI Technical Summary

Problems solved by technology

The current method is to hollow out the two ends of the motor, so as to promote the circulation of air inside and outside, which can strengthen the heat dissipation, but this structure will make it easy for foreign matter to enter the motor from the hollow, pollute the bearing, and the IP protection level is not high

In order to prevent foreign matter from entering the motor, the two ends of the motor are closed, which will affect the heat dissipation effect

That is to say, the existing motor cannot have both high IP protection level and heat dissipation function at the same time

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