Product Description:

The N9M4 brushed DC servomotor is produced by Kollmorgen within the ServoDisc Pancake DC Motors series. As a flat “pancake” design, it minimizes axial length while delivering the quick acceleration needed in pick-and-place tables, indexing stations, and other industrial automation axes. The armature’s ironless construction lowers electrical time constants, making the unit suitable for precise velocity and position loops when driven by a current-regulated amplifier. Its frameless profile also eases integration into compact rotary stages or direct-drive gearheads.

The motor’s continuous duty point is a rated speed of 3000 RPM delivering 49 N-cm of torque at 25 °C. Maintaining that output draws 7.80 A through the winding, and copper loss is governed by a resistance of 0.850 Ohms measured at ambient. Drive tuning is simplified by the torque constant of 7.27 N-cm/A, allowing controller current limits to map linearly to mechanical load. Because the armature inertia is only 0.40 kg-cm², the shaft accelerates rapidly to the maximum recommended velocity of 6000 RPM without overshoot. At that speed the generated back EMF follows the 7.60 V/KRPM constant, so voltage utilization stays within typical 24–48 V supply ranges.

During acceleration or disturbance rejection the controller may command up to 79 A, enabling the rotor to deliver 537 N-cm of short-term torque for overcoming static friction or inertial spikes. The thermal design supports a continuous mechanical output of 153 W when the armature is supplied from a 30.0 V DC bus, matching common motion amplifier rails. With a total mass of 1.4 kg, the motor can be mounted on lightweight gantry axes without excessively loading the support structure. These attributes make it effective for compact, high-response servo stages where low moving mass is critical.