Product Description:

The PMB31D-20101-01 belongs to the PMB Brushless Servomotors series produced by Pacific Scientific. It is a brushless unit intended for closed-loop positioning and velocity control in industrial automation where repeatable motion and a compact frame size are required. By combining permanent-magnet excitation with electronic commutation, this motor delivers consistent torque without brush wear, making it suitable for packaging tables, pick-and-place axes, and other duty cycles that benefit from maintenance-free rotary actuation.

The frame is classified as NEMA Size 34, so its mounting face follows the standardized 3.4-inch square pattern used on many stepper and servo stages. Stalled operation at the maximum 240 VAC bus draws 5.4 ARMS, a current rating that guides drive selection and overload protection. Rotor position is detected by an integrated Hall sensor. These three digital channels provide the commutation signals that the drive needs for six-step control and startup alignment. Field wiring is simplified because power and feedback exit through flying leads with AMP connectors, eliminating the need for a mated circular receptacle on the housing. Mechanical coupling is handled by a square key machined into the shaft, allowing direct transfer of torque into pulleys or flexible couplings without slippage.

Contamination control is enhanced by a customized shaft seal that limits lubricant loss and blocks dust at the exit point. The electromagnetic core uses a single lamination stack, referenced by a stack length multiple of 1, which corresponds to the motor's continuous torque capability within the series. The device is identified as a PMB Series brushless servomotor, which keeps the product description aligned with the published dimensional and electrical data for this motor platform.