Product Description:

The N9M4T DC motor is manufactured by Kollmorgen within the ServoDisc Pancake DC Motors series. This flat armature design serves compact automation axes where rapid torque rise and limited axial length are important. In industrial machines, the motor converts DC bus energy into controlled shaft rotation for indexing tables, semiconductor handlers, and similar positioning tasks.

At a rated terminal voltage of 28.0 V, the motor delivers continuous mechanical output of 126 W while drawing a steady 7.10 A. Its electromagnetic conversion efficiency is defined by a torque constant of 6.78 N-cm/A, so each ampere contributes nearly seven newton-centimeters to the shaft. When short bursts are required, the armature can develop 489 N-cm of peak torque and accept 77 A of peak current without exceeding thermal limits. Continuous stall torque is 44 N-cm, giving static holding capability at zero speed. The back-EMF constant is 7.10 V/KRPM, and the integral tachometer produces 3.50 V/KRPM for velocity feedback. Under rated loading the shaft spins at 3000 RPM and supplies 40 N-cm of torque at 25 °C. Terminal resistance is 0.850 Ω, which governs copper loss and determines current rise with applied voltage.

The compact housing measures 4.37 in in diameter and only 0.95 in long, allowing direct integration into disc-shaped stages or gimbal yokes. Rotor inertia is 0.59 kg-cm², enabling quick acceleration toward the maximum recommended speed of 6000 RPM without demanding large drive currents. Because of the low inertia, positioning cycles finish quickly and settling times remain tight, which is valuable in pick-and-place heads and lightweight robotic wrists. Pancake geometry also shortens the magnetic path, so thermal mass stays low and heat from copper losses dissipates through the broad face area rather than a long frame. These dimensional and inertial traits complement the electrical ratings.