U12M4A by Kollmorgen

The Kollmorgen U12M4A from the ServoDisc Pancake DC Motors series by Kollmorgen is a compact high-performance disc motor featuring a diameter of 5.50 in (139.7 mm) and weight of 8.0 lbs (3.6 kg). It delivers a rated power output of 223 Watts at a rated speed of 3000 RPM and operates on a rated terminal voltage of 46.0 Volts. The motor’s low inertia armature, with a moment of inertia of 0.0080 oz-in-sec² (0.56 kg-m²), ensures rapid acceleration and deceleration. With a rated continuous current of 7.0 Amps and continuous stall torque of 93 oz-in (66 N-cm), it sustains precise motion control. The U12M4A achieves a peak torque of 1014 oz-in (716 N-cm) at a peak current of 65 Amps, while its continuous stall current is 6.3 Amps. This construction yields zero cogging torque for smooth performance under varying loads.