... model Y3SSR8,60mm 3 phase step motor match with ME120N power supply , 86mm ... motor match with ME180N power supply ,max current 7.8A,microstep 1000,1600,2000,3200,4000,5000,6400,51200 available,pulse+direction ... control mode2 motor size 60&86mm,length 54.5 ... the current noise, no-loading motor speed can reach to 4000rpm5 motor current can be reduced half ...