The brushless DC motor consists of a motor body and a driver, and is a typical mechatronic product. The driver is composed of power electronics and integrated circuits, and its functions are: receiving start, stop, and brake signals of the motor to control start, stop, and brake of the motor; accepting position sensor signals and forward and reverse signals for controlling the inverse The power bridges of the variable bridges are turned on and off to generate continuous torque; the speed command and the speed feedback signal are accepted to control and adjust the speed; provide protection and display, etc.