Product Description:

The JR12M4CH DC motor is produced by Kollmorgen within the ServoDisc Pancake DC Motors series. Its flat armature delivers direct mechanical power to indexing tables, semiconductor tools, and other automation axes that require quick acceleration within a shallow envelope. As a permanent-magnet brushed unit, it converts regulated armature current into rotary motion, allowing drive amplifiers in machine cells to command precise speed or torque without a gearbox. The disc construction minimizes inductance and eliminates cogging, which helps maintain smooth low-speed positioning in industrial equipment.

The motor develops a back electromotive force of 17.80 V/krpm, indicating the voltage generated by the armature for every thousand revolutions per minute and supporting drive selection for regenerative conditions. A torque constant of 24.10 oz-in/A links output torque to supplied current, so motion controllers can calculate the armature current required for each load. During continuous duty, the winding carries 8.4 A at a rated terminal voltage of 63.0 V, producing its rated mechanical output without exceeding the thermal limit. Internal copper loss is affected by a terminal resistance of 0.950 ohm, which influences resistance heating and low-speed efficiency.

The continuous stall torque is 11 lb-in, providing steady holding torque for static loads, while the peak torque of 118 lb-in accommodates brief acceleration transients before demagnetization or commutator limits are reached. With a rotor inertia of 0.017 oz-in-s², the motor responds rapidly to command changes and supports high-bandwidth position loops. Rated operation occurs at 3000 rpm, producing 414 W of shaft power within an enclosure that measures 5.50 inches in diameter and 3.94 inches in length. The motor weighs 8 pounds, and its flat profile supports direct installation on timing pulleys or friction drives in machinery with limited axial space.