Product Description:

The PMB31B-00116-00 belongs to the PMB Brushless Servomotors series produced by Pacific Scientific. It is a brushless servomotor intended for closed-loop speed and position regulation in industrial automation, where compact electromechanical actuators are required to follow programmed motion profiles with low maintenance demands. The shaft end is machined with a flat, which gives couplings a positive anti-rotation surface while preserving concentricity during repeated starts, stops, and reversals.

The motor is wired through flying leads with AMP connectors, eliminating a mating receptacle and allowing direct harness assembly on the machine. Position feedback is delivered by a digital encoder that resolves each revolution into 4096 ppr, and this high count supports fine incremental motion, stable speed regulation, and accurate low-speed operation. With a NEMA Size 34 frame, the housing aligns with standardized mounting patterns commonly found on medium-torque axes. During static load conditions at 240 VAC, the windings draw a nominal stall current of 2.7 ARMS, a value used to size fuses and set amplifier current limits without overstressing the motor. Commutation data are embedded in the feedback stream because the sensor is a digital encoder with commutation, so the drive can synchronize phase switching without separate Hall sensors.

This unit is supplied as a Standard Motor with no special winding or mechanical options, so the basic configuration remains straightforward for general motion axes. The motor uses a stack length multiple of 1, indicating the shortest active stack in the series and resulting in lower inertia suited for rapid index cycles and short acceleration ramps. That shorter active stack helps the motor respond quickly in applications that require frequent starts, stops, and direction changes. All external ordering references follow the same PMB family conventions, which keeps identification consistent across related motors in the product line.