This driver is also called brushless DC motor controller, it has wide speed range, from 0-6000 RPM, its running acceleration/deceleration time can be set by software to achieve smooth and soft operation. The main parameters to be referred to when selecting a brushless DC motor are as follows: Maximum torque, Square Mode Torque and Rotating speed. The speed of the motor can be determined according to the trapezoidal curve of the motor speed.