Product Description:

The 9FHB-44 is a flat armature DC motor produced by Kollmorgen as part of the ServoDisc Pancake DC Motors series. This brush-commutated unit uses a thin axial magnetic circuit to minimize rotor inertia while maintaining usable torque. In automated machinery, it mounts directly to gearheads or precision lead screws, supplying controlled rotational motion without the length of conventional cylindrical motors. Its design suits pick-and-place axes, semiconductor handlers, and optical positioning stages that require fast acceleration within a compact envelope.

At a rated speed of 3000 rpm, the motor can deliver a continuous torque of 21 oz-in when the winding temperature is maintained at 25 °C. Sustaining this output requires a continuous armature current of 7.26 A, which guides drive sizing and cabling. The input circuit is designed for a nominal terminal voltage of 15.2 V, and the low-mass rotor produces mechanical output in direct proportion to current according to its torque constant of 3.92 oz-in/A. Available continuous torque decreases slightly to 19 oz-in at a winding temperature of 40 °C. During steady operation, the 0.78 Ω terminal resistance and 2.0 °C/W thermal path help keep copper loss within thermal limits.

Transient loads are supported by a peak torque capability of 267 oz-in for brief intervals at a peak current of 78 A. Within this limit, the iron-free rotor accelerates quickly because its moment of inertia is only 0.0064 oz-in-s² and its total moving mass is low. The motor provides a continuous mechanical power output of 47 W while occupying 0.76 in in length and 4.96 in in outside diameter. With a mass of 1.3 lb, the motor places a modest load on delicate structures. Its 2.9 V/krpm back-EMF constant can be used to calculate regenerative voltage.