Product Description:

The PMB31B-20114-01 brushless servomotor is manufactured by Pacific Scientific. It is used in industrial automation to convert electrical power into controlled rotary motion, providing accurate speed and torque regulation for machinery such as packaging stations, conveyors, and small machining centers. This type of motor is commonly paired with a servo drive that adjusts current in real time to maintain commanded motion during changing load conditions. It fits applications where repeatable positioning and smooth acceleration are needed without the maintenance associated with brushed commutators.

As a NEMA Size 34 unit, the motor uses the mounting pattern established for that frame size, which simplifies installation in equipment built for the same footprint. At 240 VAC, the nominal stall current limit is 2.7 ARMS, which is the rated phase current supplied when the rotor is held motionless under load. Position feedback comes from an incremental encoder with 2048 ppr, allowing the controller to resolve 2,048 positions per mechanical revolution for tight speed loops. Power and feedback conductors exit through flying leads with AMP connectors, and internal commutation is handled by a digital encoder with commutation so phase switching stays aligned with actual shaft position.

For contamination-prone locations, the motor can be ordered with a shaft seal to help keep oil or dust out of the front bearing cavity. The output shaft uses a square key, which provides positive torque transmission to pulleys or couplings without relying only on friction. A stack length multiple of 1 gives the standard magnetic length for this model and helps keep overall size moderate. The unit is identified as a PMB Series Brushless Servomotor, placing it in the product group that shares the same basic motor platform. That grouping indicates similar electromagnetic layout across related models, which supports predictable response with compatible controls.