Product Description:

The PMB31D-00201-00 is a brushless servomotor produced by Pacific Scientific and delivered within the PMB Brushless Servomotors series. As a three-phase permanent-magnet unit, it provides precise velocity and torque control for indexing tables, material-handling arms, and general-purpose automated machinery. In an industrial drive system, the motor links to a digital servo amplifier and responds to commanded current with rapid electromagnetic torque, allowing tight position loops without mechanical backlash.

Within the PMB Brushless Servomotors family, this model follows the dimensional code NEMA Size 34, so its face-mounting pattern and pilot diameter match standard 3.4-inch square frames. A continuous electromagnetic load of 5.4 ARMS can be applied at 240 VAC, so the drive must supply that current during locked-rotor holding or low-speed operation. Power and feedback conductors exit the housing as flying leads with MS connectors, combining strain relief with rapid cabinet mating. Rotor position information is delivered by a Hall sensor, giving six electrical states per revolution for commutation and coarse speed feedback. Mechanical energy is transferred through a flat shaft, a geometry that helps prevent rotational slip when clamped by set-screw couplings or pinions.

This unit is a Standard motor, so it is supplied without special winding, sealing, or feedback changes. Its axial build corresponds to a stack length multiple of 1, the shortest stack offered in the line, which helps keep inertia low and supports fast acceleration in light-load axes. The short axial length also helps limit overhang where installation space is restricted near guards, couplings, or adjacent machine components. It can be fitted into compact axis layouts where motor length matters as much as rotational response. That combination suits indexing and handling applications that need responsive motion, compact mounting dimensions, and straightforward connection to a compatible servo drive.