Product Description:

The U16M4 is a brushed DC servo motor manufactured by Kollmorgen for the ServoDisc Pancake DC Motors series. Its disk-shaped armature shortens the magnetic path, giving it a high torque-to-length ratio that suits compact automation stages, rotary actuators, and precision indexing equipment. Installed with a suitable drive, the motor supplies closed-loop speed and position control that integrates directly into industrial motion platforms.

The motor operates at a rated terminal voltage of 82.7 V and reaches a nominal shaft speed of 3000 rpm while delivering 704 W of mechanical power. Under these conditions, it draws a rated continuous current of 11.0 A to generate a continuous torque of 227 N-cm at 25 °C; the torque drops to 203 N-cm when the housing temperature rises to 40 °C. A terminal resistance of 0.880 Ω limits armature current at low speeds, and the back EMF constant is 23.30 V/krpm, providing predictable voltage feedback for the control loop. The torque constant is 22.27 N-cm/A, so commanded current scales linearly with output torque. For static holding tasks, the continuous stall torque is 194 N-cm, allowing the shaft to maintain a load without overheating.

During acceleration, the motor withstands a peak torque of 2105 N-cm, while the drive may supply up to 95 A for short durations. Rotor integrity and commutation advance limit operation to a maximum speed of 6000 rpm. The unit measures 187.2 mm in diameter and 64.8 mm in length, and it weighs 8.4 kg. Its low-profile shape allows it to be mounted directly to compact stages without requiring additional axial support. The broad speed range supports positioning cycles that combine controlled low-speed motion with rapid travel between operating points.