Product Description:

The PMB31B-20100-00 is a brushless servo motor built by Pacific Scientific and supplied within the PMB Brushless Servomotors series. As a servomotor, it converts drive current into controlled rotary motion. This allows positioning tables, pick-and-place heads, and other axis modules to follow precise speed and torque commands issued by the drive electronics in industrial automation cells. Because the rotor is electronically commutated, the motor can support smooth low-speed operation and accurate response to changing load demands.

This motor is built on the NEMA Size 34 frame, so the mounting face measures 3.38 inches square and fits equipment that uses the NEMA 34 bolt pattern. That frame size is common in compact industrial axes where available mounting space is limited but a rigid face connection is still required. The motor has a nominal stall current of 2.7 ARMS at a maximum of 240 VAC, so the drive can supply the current needed to hold rated torque without rotor movement. Rotor position feedback is provided by a Resolver, so the companion drive receives shaft angle information even in electrically noisy environments and at elevated temperatures. Power and feedback conductors exit the housing as flying leads with AMP connectors, eliminating the need for a separate junction box. Mechanical power is transferred through a shaft with a square key, allowing keyed hubs or pulleys to stay engaged during torque reversal.

The model is a standard motor, which means it uses the baseline winding and mechanical options rather than a custom coil or enclosure variant. It has a stack length multiple of 1, so the internal lamination stack follows the series' shortest magnetic path and helps keep inertia low for rapid speed changes. This configuration is suitable for motion axes that need quick changes in speed without the added mass of a longer stack. The description PMB Series Brushless Servomotor places it within the product line. Its origin from Pacific Scientific also matches installations that use this manufacturer's motion components and resolver-based feedback hardware.