Product Description:

The PMB31B-00200-02 is a brushless servo motor manufactured by Pacific Scientific as part of the PMB Brushless Servomotors series. This rotary unit is built for industrial automation axes that demand tight velocity loops, fast reversal, and repeatable positioning. By coupling with a matched drive, it turns electrical energy into controlled torque so that conveyors, pick-and-place actuators, or small machining spindles move exactly as the program commands. Its compact format suits motion axes where quick starts, short positioning moves, and frequent direction changes occur throughout the duty cycle of the machine.

The motor body follows the NEMA Size 34 mounting standard, allowing direct replacement in panels already drilled for 3.4-inch square frames. When energized from a 240 VAC bus, the winding draws a nominal stall current of 2.7 ARMS, a value used to size the drive amplifier and cabling. Rotor position is returned through a resolver, providing angle information without requiring batteries or optical discs. Phase and feedback leads exit as flying leads with MS connectors, which join quickly to mating bulkhead sockets during service. Motion is transferred through a flat shaft end that seats securely in collet clamps or pinned couplings while keeping overall length short.

A built-in PTC Thermistor is included for temperature monitoring, opening a control interlock if the windings approach their rated thermal limit. The magnetic core uses a stack length multiple of 1, the shortest option in the platform, so inertia remains low for start-stop duty cycles. Low rotor inertia helps the drive reach commanded speed quickly and reduces overshoot when the axis reverses direction. The unit is a PMB Series Brushless Servomotor intended for compact servo applications. The Pacific Scientific design uses connector and mounting dimensions that support integration with common industrial automation hardware.