Product Description:

The PMB31B-20116-01 belongs to the PMB Brushless Servomotors series manufactured by Pacific Scientific. It is a brushless servomotor intended for closed-loop positioning, speed, and torque control in industrial automation cells, pick-and-place axes, and packaging equipment. The motor’s permanent-magnet rotor and electronic commutation allow fast response and tight velocity regulation, making the unit suitable for applications that demand repeatable motion profiles. Its brushless design also supports repeated starts, stops, and speed changes without the brush wear associated with brushed motor constructions.

This model fits the NEMA Size 34 frame envelope, so its face-mounting pattern matches widely used 3.4-inch square motor brackets. On a 240 VAC bus, it can deliver a nominal stall current of 2.7 ARMS, which is the continuous phase current the drive must supply when the shaft is locked under rated load. Power and feedback are routed through flying leads with AMP connectors, so the motor can be wired without additional crimping. Rotor position is reported by a digital encoder with commutation, and the incremental channel provides a native resolution of 4096 ppr for smooth low-speed operation and accurate incremental moves.

A factory-installed shaft seal blocks lubricant migration and airborne contaminants, helping the motor operate in moderately dirty environments. Torque is transferred through a square key at the end of the shaft, which helps prevent slip when the load undergoes rapid torsional changes. The motor uses stack length multiple 1, the shortest lamination stack in the series, which gives lower inertia for quicker acceleration. The keyed output and sealed shaft end support use in motion systems where secure torque transfer and basic contamination protection are both important.