Research on interference suppression of permanent magnet brushless DC motor based on multi-order sliding mode

This paper uses MATLAB/Simulink software to simulate the brushless DC motor drive system without rotating shaft sensor. In this paper, the commutation point signal is obtained by line-to-line back electromotive force. The speed and current are controlled by sliding mode controller. The three-phase inverter outputs voltage to the brushless DC motor. Finally, the speed, voltage, current and angular position of the brushless DC motor are obtained. The experimental results verify that the proposed control scheme can effectively suppress the transient load interference and enable the speed to recover the steady state value in a short time.