Product Description:

The PMB31B-00216-00 brushless servomotor is manufactured by Pacific Scientific and belongs to the PMB Brushless Servomotors series. It is specified for closed-loop motion axes in automated assembly, packaging, and inspection equipment where mid-frame torque and rapid acceleration are required. Within these systems, the motor converts drive current into controlled rotary output, eliminating brush wear and supporting accurate electronic commutation. Its compact frame simplifies integration on gantries, index tables, and other machinery that demand space-efficient actuation.

At zero speed, the winding can safely carry 2.7 ARMS of stall current when supplied from a 240 VAC source, so the drive must provide that level continuously without exceeding thermal limits. The integral encoder delivers 4096 ppr feedback resolution, permitting the controller to issue angular increments of 0.088° for smooth velocity regulation and fine positional accuracy. Frame geometry follows NEMA Size 34, meaning the front face measures 3.4 inches square with a standardized pilot and bolt circle that mates to common gearheads or brackets. Power and feedback exit the housing on flying leads with MS connectors, allowing quick mating to panel-mounted receptacles. Position and commutation information is supplied by a digital encoder with commutation, eliminating the need for separate Hall devices and reducing cable count.

A flat shaft end provides a mating surface for clamping hubs or pulleys, helping prevent slippage during bidirectional torque cycles. The magnetic stack uses a length multiple of 1, producing moderate inertia that supports rapid starts while limiting overshoot. This configuration is delivered as a Standard Motor, so the windings, flange, and sealing follow the baseline Pacific Scientific design. As a PMB Series Brushless Servomotor, the unit uses the manufacturer's standard servo drives and parameter sets.