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In the surface-mounted permanent magnet synchronous motor speed control system, the problems of large overshoot, poor robustness and susceptibility to load disturbance in classic PI control are addressed. 

Brushless DC motors (BLDCM) are widely used in aerospace and other control fields due to their advantages of long life, high power density, small size, and large output torque. However, the traditional method of using the sensor to obtain the rotor position signal has the disadvantages of difficulty in manufacturing, susceptibility to interference, and difficulty in working in high and low temperature environments, which greatly limits its wider application. Sensorless control technology can overcome these shortcomings.

Radial radiated noise of motor is mainly caused by radial electromagnetic force. In this paper, force wave analysis, electromagnetic scheme optimization and experimental verification were carried out to solve the problem of low speed noise of a lunar vehicle motor.

Synchronous reluctance motor (SynRM) is simple in structure, stable and reliable. However, the torque and power factor are low. Under overload operation, the silicon steel sheet in the key position where the flux flows, such as the rotor magnetic bridge and stator tooth, will gradually become saturated, which will increase the heat of the motor and reduce the output torque.