U12M4A Kollmorgen
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The Kollmorgen U12M4A is part of the ServoDisc Pancake DC Motors series and has a rated power of 223 watts with a rated speed of 3000 RPM. It offers a continuous current of 7.0 amps, a peak torque of 1014 oz-in, and weighs 8.0 pounds. The motor operates at a rated voltage of 46.0 volts and features an armature inductance of 100 microhenries.
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Product Description:
The U12M4A is a flat-profile DC servo motor manufactured by Kollmorgen for the ServoDisc Pancake DC Motors series. The unit employs an ironless disc armature that eliminates cogging, making it suited for precision positioning stages, semiconductor handling equipment, and light articulating mechanisms. In industrial automation the motor integrates with servo amplifiers to convert electrical commands into controlled rotary motion, acting as the primary actuator where low inertia and quick torque response improve cycle times and positioning accuracy.
At its continuous operating point the motor can deliver 100 oz-in of torque at 25 °C, and 90 oz-in when the ambient rises to 40 °C. It sustains this output with a winding current of 7.0 A, while the permanent-magnet construction supplies a 93 oz-in stall value for static holding. The rated mechanical condition pairs a 3000 RPM shaft speed with a 46.0 V supply, producing 223 W at the output shaft. Electrical losses are limited by a 1.170 Ohm terminal resistance and a 100 µH maximum armature inductance, both of which help the drive regulate current during dynamic changes. A back-EMF constant of 11.55 V/KRPM enables the controller to estimate velocity directly from generated voltage.
For rapid moves the servo tolerates a 6000 RPM maximum speed and can generate a 1014 oz-in surge of torque for short bursts by accepting up to 65 A of peak current. The torque constant of 15.63 oz-in/A links commanded current to delivered torque, simplifying current-loop tuning. A low 0.0080 oz-in-s² rotor inertia lets axes reverse direction quickly without overshoot, while the overall 8.0 lb mass aids heat dissipation when the motor is clamped to machinery. These properties widen the usable performance envelope beyond the rated point without thermal saturation.
