... , paper making, textile, cement-making, printing, dyeing. Features and applicationZ4 Series DC machine motors are newly developed products of our works ... : 3000, 1500, 1000, 750, 600, 500, 400, 300 and 200 r/min, totally nine grades. Decrease armature voltage to make speed ... armature speed range can be down to the lowest 20 r/min at constant torque and stable running.4. Separate excitation ...