Product Description:

The N12M4LR pancake DC motor is produced by Kollmorgen within the ServoDisc Pancake DC Motors series. As a frameless, low-profile armature design, the motor delivers direct torque in compact automation stages, pick-and-place heads, and indexing tables where axial space is limited. The flat disc armature eliminates iron-core losses, providing rapid acceleration and precise speed regulation for industrial motion platforms.

At its nominal operating point, the motor accepts a supply of 26.0 V at a rated speed of 3000 rpm while drawing a continuous rated current of 14.80 A. The armature has an intrinsic resistance of 0.170 Ω, while the external terminals measure 0.310 Ω; these values affect voltage drop and heat generation under load. A back-EMF constant of 7.60 V/krpm correlates speed with generated voltage, and the disc rotor has an inertia of 1.34 kg-cm² for low energy storage during reversals. Torque production scales with a constant of 7.20 N-cm/A, allowing linear current-to-torque control, and the safe mechanical limit caps unloaded operation at 6000 rpm. At a winding temperature of 25 °C, the motor produces 93 N-cm continuously. This rating decreases to 83 N-cm at 40 °C as copper resistance rises. The assembly weighs 2.4 kg, allowing it to be mounted on lightweight end effectors.

During transient events, the N12M4LR delivers a continuous stall torque of 96 N-cm without exceeding its thermal limits, while short bursts can reach a peak torque of 1075 N-cm to accelerate heavy loads from rest. Achieving this surge requires up to 159 A from the drive amplifier, so conductor sizing and current-limit settings must accommodate the peak demand. When operated at the rated point, the output power reaches 291 W, supplying mechanical power to conveyors or rotary actuators. The disc construction minimizes detent torque, allowing closed-loop controllers to use the high torque-to-inertia ratio during rapid direction changes without creating tuning instability.