DC MOTOR ,CE,CCC,ISO are approved ! Series Z4 dc motors are newly ... 3000, 1500, 1000, 750, 600, 500, 400, 300 and 200 r/min, totally nine grades. Decrease armature voltage to ... to the lowest 20 r/min at constant torque and stable running. 4.Separate excitation is the basic excitation ... corrode insulation. D. Duty: Continuous (SI); E. Armature and field circuits for motors may be either operated on static ...