Product Description:

The PMB31D-00214-03 brushless servomotor is produced by Pacific Scientific and belongs to the PMB Brushless Servomotors series. Designed for mid-frame machinery, this unit furnishes continuous torque to positioning tables, indexing feeders, and light gantry axes. Its brushless design supports repeatable response and reduced wear because there are no brushes to service. Within an automation cell, it serves as the electromechanical actuator, receiving sinusoidal phase currents from a digital drive while returning encoder feedback so the controller can issue precise velocity or position corrections during every cycle.

The motor uses the NEMA Size 34 standard, so the flange face, pilot, and bolt circle match common US motion platforms. At 240 VAC, the motor draws a nominal stall current of 5.4 ARMS, indicating the phase current required when the shaft is held at stall. Position information comes from a 2048 ppr incremental signal generated by the internal digital encoder with commutation, which also provides three Hall signals for electronic phase alignment. Power and feedback connections use flying leads with MS connectors, which simplifies field wiring where quick-disconnect service is preferred. This arrangement supports closed-loop operation with servo amplifiers that accept incremental feedback and commutation signals.

Factory configuration includes a shaft seal and a PTC thermistor, which help block oil ingress at the front bearing and signal excessive winding temperature. The thermistor can be wired into the drive protection circuit so overheating is detected before insulation is overstressed. A machined flat on the shaft eases rigid coupling to pulleys or pinions without a keyway. The stator uses a stack length multiple of 1, representing the shortest active core in the family and helping minimize inertia for responsive axis movement.