Rotor magnetic steel structure of driving motor of electric two-wheeled vehicle

Abstract

The invention discloses a rotor magnetic steel structure of a driving motor of an electric two-wheeled vehicle. The magnetic steel comprises a magnetic steel body, the outer wall surface of the magnetic steel body is a cambered surface and is attached to the inner wall of a motor rotor iron ring, and the curvatures of circles where the magnetic steel body and the inner wall are located are consistent; and the inner wall surface of the magnetic steel body is a plane, and a non-uniform air gap used for reducing motor harmonic waves is formed between the inner wall surface and a motor stator core. According to the rotor magnetic steel structure of the driving motor of the electric two-wheeled vehicle, one surface is the cambered surface, and the other surface is the plane, so that a gap between the magnetic steel and the rotor iron ring is reduced, the utilization rate of the magnetic steel is improved, an air gap between the magnetic steel and the stator iron core is changed into a non-uniform air gap, harmonic waves of the motor can be reduced, torque pulsation and vibration noise can be inhibited, the motor cost can be reduced, the motor iron loss is reduced, and the motor efficiency is improved.

Description

technical field [0001] The invention relates to the field of motors for electric two-wheel vehicles, in particular to a rotor magnetic steel structure of a driving motor for electric two-wheel vehicles. Background technique [0002] The motors of electric two-wheeled vehicles are mostly outer-rotor hub motors, which are low-speed direct-drive motors. Unlike conventional high-speed motors, they have low efficiency and high energy consumption. [0003] In the prior art, the magnetic steel 1' of the outer rotor motor of an electric two-wheeled vehicle is generally rectangular, and is directly pasted on the inner side of the rotor iron ring 2', such as image 3 As shown, in order to reduce the distance between the rectangular straight edge of the magnet 1' and the inner circular arc of the rotor iron ring 2', the width of the magnet 1' should not be too large, so that the number of poles of the rotor is very large, and too many poles are not enough. It is beneficial to optimize ...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a rotor magnetic steel structure for the drive motor of an electric two-wheel vehicle. In view of the above problems, the shape of the existing magnetic steel is optimized to solve the problems of low utilization of the magnetic steel, large number of motor poles, and low cost in the existing structure. High, high harmonics of the motor magnetic field, affecting the performance of the motor, etc.

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