Phase-locked internal model control-based research on brushless DC motor variable speed control system

According to internal model control and phase-locked loop principle, a new method of overshoot-free, high-accuracy variable speed control of brushless DC motor is proposed. Speed error integral and error signal of the speed controller are both detected by using the phase angle and frequency of the pulse signal of speed at the same time to ensure that the speed control system can lock arbitrary speed command easily in a controllable mode and achieve a high-accuracy variable speed control performance. The theoretical analysis and simulation results show that the proposed method can make the system get a good dynamic and static performance with a simple design and easy control .