Product Description:

The PMB31D-20116-01 is a brushless servomotor manufactured by Pacific Scientific and supplied as part of the PMB Brushless Servomotors series. This product type is engineered for closed-loop motion tasks where accurate speed and position are required to coordinate conveyors, actuators, and other axis modules on automated machinery. By combining permanent-magnet rotor construction with electronic commutation, the motor delivers repeatable torque transitions that help maintain cycle consistency across production shifts.

The frame of the motor is classified as NEMA size 34, so its mounting face and pilot dimensions match standard 3.4-inch flange patterns used by many servo gearheads and brackets. Under a 240 VAC bus, the windings can sustain a nominal stall current of 5.4 ARMS, indicating the continuous phase current the drive must supply during static holding or low-speed moves without exceeding thermal limits. Rotor position feedback is generated by a 4096 ppr optical encoder, permitting fine command resolution for indexing and contouring sequences. That sensing element is a digital encoder with commutation, so the same device provides both incremental motion data and the three Hall signals required for sinusoidal current phasing. Power and feedback conductors exit the housing as flying leads with AMP connectors, eliminating the need for mating plugs on the motor side and simplifying cable routing through tight frames.

The mechanical output shaft uses a square key to lock pulleys or couplings against slip. A factory-applied shaft seal helps keep lubricant and dust away from the front bearing when the motor is mounted in washdown or particulate environments. Magnetic stack height is fixed by a stack length multiple of 1, giving this model the lightest rotor inertia available in the family and enabling brisk acceleration when paired with the stated electrical characteristics.