N12M4 Kollmorgen
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The Kollmorgen N12M4 is a DC motor from the ServoDisc Pancake DC Motors series with a diameter of 139.7 mm and a length of 27.2 mm. It delivers a rated power output of 316 W, a rated speed of 3000 RPM, and produces a continuous stall torque of 104 N-cm. The motor weighs 2.4 kg and offers a peak torque of 1128 N-cm with a peak current of 83 A.
Internal Product Review
The N12M4 is a Kollmorgen ServoDisc pancake DC motor with 316 W rated power output and 3000 RPM rated speed. The torque profile is especially impressive in servo applications, with 104 N-cm continuous stall torque and 1128 N-cm peak torque. Strong power density makes the motor an excellent choice for high-performance motion systems.
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Product Description:
The N12M4 is a frameless permanent-magnet DC servo motor manufactured by Kollmorgen within the ServoDisc Pancake DC Motors series. As a thin “pancake” unit, it integrates easily into compact stages, conveyors, and semiconductor handlers that need direct-drive rotary motion. By supplying torque proportional to current and accepting position feedback from an external encoder, the motor functions as the primary actuator in closed-loop industrial automation axes. Its frameless configuration allows the motor to be incorporated directly into a machine assembly rather than installed in a conventional motor housing.
The motor’s rated terminal voltage of 51.0 V supports operation from 48 V-class DC bus supplies commonly found in mobile or distributed drive systems. At the rated shaft speed of 3000 rpm, it produces 316 W of mechanical power, matching applications that require constant velocity, such as indexing tables. A continuous winding current of 8.00 A sustains output without exceeding the thermal limit associated with the 27.2 mm stack. The electromagnetic relationship is represented by a torque constant of 14.41 N-cm/A; multiplying this constant by the commanded current provides the corresponding motor torque. When the rotor is locked, the windings can hold a load with a continuous stall torque of 104 N-cm, supporting position retention under static conditions.
The motor provides transient capacity for rapid motion. During acceleration, the drive may apply a peak winding current of 83 A, which produces a peak torque of 1128 N-cm for short intervals and allows heavy fixtures to start or stop quickly. Safe operation requires keeping the shaft below the maximum recommended speed of 6000 rpm to preserve commutator integrity. Despite this performance, the motor weighs only 2.4 kg. Its 139.7 mm diameter and 27.2 mm length provide a compact mechanical profile for installations with limited axial space. A moment of inertia of 1.34 kg-cm² supports responsive acceleration and deceleration in high-cycle servo positioning tasks.
