U12M4HT Kollmorgen
Wake Industrial LLC is not an authorized distributor of this product.
The Kollmorgen U12M4HT is part of the ServoDisc Pancake DC Motors series and weighs 11 pounds with a diameter of 5.50 inches and length of 2.82 inches. This motor delivers a rated continuous torque of 158 oz-in at 25°C, a peak torque of 1846 oz-in, and a rated power output of 350 watts at a speed of 3000 RPM. It operates at a rated terminal voltage of 56.5 volts with a rated continuous current of 7.93 amps.
Internal Product Review
The U12M4HT is a Kollmorgen ServoDisc Pancake DC motor with 350 W rated power output and 158 oz-in rated continuous torque at 25 C. Peak torque of 1846 oz-in and a 6000 RPM max recommended speed give this motor excellent dynamic performance for demanding servo applications.
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Product Description:
The U12M4HT is a pancake-style DC motor produced by Kollmorgen within the ServoDisc Pancake DC Motors series. This frameless, brush-commutated unit delivers direct torque in a shallow 5.50-inch footprint, making it suitable for compact indexing heads, semiconductor stages, and other positioning axes where axial space is limited. By combining a flat armature with rare-earth magnets, the motor supplies continuous rotary motion to automation equipment that must accelerate rapidly while maintaining precise velocity control.
During operation, the motor can reach a peak torque of 1846 oz-in, a short-term value used to overcome inertial loads during startup. Its rated continuous torque at 25 °C is 158 oz-in, produced while drawing a steady 7.93 A from the drive. At the rated speed of 3000 rpm, this torque corresponds to 350 W of mechanical output when the terminals are supplied with 56.5 V DC. A torque constant of 21.92 oz-in/A links armature current directly to load torque, simplifying current-mode control loops. Average friction torque is limited to 7.0 oz-in, so little drive effort is lost through bearing and brush drag. The armature has a moment of inertia of 0.0270 oz-in-sec², supporting fast acceleration without excessive overshoot. Its flat rotor fits within a 2.82-inch stack length, which simplifies integration into slim housings.
The motor has a maximum recommended speed of 6000 rpm, allowing the same frame to support high-throughput operation when paired with appropriate gearing. The back-EMF constant is 16.20 V/krpm, enabling the controller to estimate speed from generated voltage during open-loop operation. A terminal resistance of 0.750 Ω helps keep copper losses moderate, while the motor provides 139 oz-in of continuous torque at an ambient temperature of 40 °C. Despite its flat geometry, the motor weighs only 11.0 lb, reducing the load on linear slides and articulated arms while retaining the required 5.50-inch mounting diameter.
