... 33 ( :mm ) 3)250g 1) Speed PID closed loop control, bigger torque at lower speed2) Wide speed range,0-6000RPM3) Acceleration and deceleration ... rise, small size and easy to be assembled.5) Multi-speed control method, can be set up by software.6) Multi-improved ... digital design makes it possess flexible and diverse input control mode, high speed ratio, low noise, improve the hardware and software ...