Product Description:

The PMB31B-00201-00 is a brushless servomotor produced by Pacific Scientific and included in the PMB Brushless Servomotors series. As a rotary actuator for industrial automation, it converts commanded drive current into precise shaft torque for indexing tables, pick-and-place heads, light packaging axes, and other servo-driven assemblies. The motor is intended for controlled rotary motion where stable torque output and responsive speed control are required during repeated duty cycles. Its brushless design supports electronic commutation without mechanical contact wear in the feedback path.

Mechanical integration follows the NEMA Size 34 frame standard, so the motor fits machine layouts built around that common flange and pilot diameter. At a rated bus voltage of 240 VAC, the winding delivers a nominal stall current of 2.7 ARMS, which corresponds to the continuous torque limit with the rotor at standstill. Position reference comes from a three-phase Hall sensor, which provides commutation signals to the servo amplifier at fixed electrical intervals. This feedback method gives the drive the phase information needed to energize the motor correctly from startup through normal running speed. Field wiring exits through flying leads with MS connectors, and the stack length multiple of 1 indicates the shortest active core in the PMB family, helping keep overall mass low for dynamic motion.

This unit is supplied as a standard motor, so it does not use special windings or added environmental modifications. That makes it suitable for applications that use the baseline configuration of the product line and do not require custom sealing or electrical options. The shaft end has a flat, allowing clamp-style couplings to transmit torque without a keyed connection. This arrangement can help reduce backlash in compact axes where smooth motion and repeatable positioning matter during frequent start-stop cycles.