Product Description:

The PMB31D-10216-03 is a brushless servomotor produced by Pacific Scientific for the PMB Brushless Servomotors series. The unit serves as the torque element inside motion axes, providing continuous rotation that can be accurately commanded by a matched servo drive. In industrial automation cells, the motor’s low inertia and electronic commutation help maintain repeatable speed and position under dynamic load changes, making it suitable for packaging stations, electronic assembly rigs, and other equipment that depends on synchronized, feedback-controlled movement.

The motor uses a NEMA Size 34 frame, a standard mounting pattern that aligns with widely available gearheads and brackets. Power and feedback exit the housing through flying leads with MS connectors, allowing quick plug-in to shielded cables without custom terminations. Rotor position is measured by a digital encoder with commutation; its coarse Hall tracks supply phase information to the drive while the fine channel resolves motion down to 4096 ppr, enabling sub-degree indexing. The output shaft has a round profile, so couplings or pulleys can be pressed on without keyways that might introduce backlash.

With a 240 VAC bus, the motor reaches a nominal stall current of 5.4 ARMS, which indicates the continuous torque demand the drive must supply during zero-speed hold or low-speed cutting cycles. To guard against contamination and overheating, the motor is equipped with a shaft seal and PTC thermistor; the seal blocks dust and coolant ingress, and the thermistor signals the drive to limit current before winding temperature rises too high. A stator lamination stack length multiple of 1 indicates the shortest magnetic core offered in the line, favoring fast acceleration over peak torque. The overall construction is that of a PMB Series Brushless Servomotor.