... stable temperatureFeature:1 SR driver model Y3SSR8,60mm 3 phase step motor match with ME120N power supply , 86mm 3 phase step motor match with ME180N ... ,3200,4000,5000,6400,51200 available,pulse+direction control mode2 motor size 60&86mm,length 54.5&76.5&66.5 ... technique,reduce the current noise, no-loading motor speed can reach to 4000rpm5 motor current can be reduced half or 90% automatically ...