说明：  基于无刷直流电机的simulink仿真图，可以通过示波器查看电机的反电动势波形和电流波形以及可以使电机转速达到期望值
(Based on the simulink simulation diagram of the brushless DC motor, you can view the motor s back electromotive force waveform and current waveform through the oscilloscope and can make the motor speed reach the desired value)