Product Description:

The PMB31B-00216-03 is a brushless servomotor produced by Pacific Scientific for the PMB Brushless Servomotors series. As a permanent-magnet unit, it couples with matching servo drives to deliver regulated torque and speed across a wide operating range. In automated assembly lines, labeling machines, or small gantry axes, the motor provides repeatable motion profiles while occupying minimal panel depth. Its compact format suits motion axes where available mounting space is limited but repeatability still matters.

The motor follows the NEMA Size 34 frame envelope, so its mounting holes and pilot diameter align with standard 3.4-inch square equipment brackets. Under static load at 240 VAC, the windings absorb a nominal stall current of 2.7 ARMS, which helps determine drive sizing and thermal limits during holding or low-speed operation. Rotor position feedback is supplied by a digital encoder with commutation, and the device also provides Hall-level commutation tracks along with incremental pulses. The incremental channel provides 4096 ppr resolution, enabling fine velocity regulation and precise positioning with compatible drives. For power and signal termination, the unit uses flying leads with MS connectors, allowing quick mating inside a cabinet while keeping the motor body free of bulky plugs.

The mechanical output uses a flat shaft, a profile that simplifies torque transfer through set-screw or clamp couplings without relying on keys. Environmental and thermal protection are supported by a shaft seal and PTC thermistor; the seal limits the ingress of liquids or dust at the front bearing, while the thermistor lets the drive reduce or stop current before overheating occurs. The motor has a stack length multiple of 1, which indicates the shortest core in the series and supports reduced inertia for quicker acceleration. This short magnetic stack suits compact axes where responsive motion is more important than maximum continuous output.