Characteristic : 1.SPWM ,current .speed double closed loop , low speed high torque ,work stably . 2.High speed torque ,Max speed 98000rpm/min . 3.Max speed ratio is 1: 75 . 4.Flexible magnetic pole location setting ,60°/300°/120°/240°can be selected , suitable for different size motor 5.Providing two way of speed adjustment . 6.Start and stop .quick brake ,photoelectric isolator 7.Output test speed ,alarm signal output http://www.wotomotor.com/