Product Description:

The PMB31D-10101-00 is a brushless servomotor produced by Pacific Scientific as part of the PMB Brushless Servomotors series. It is intended for closed-loop motion tasks in industrial automation, where precise torque and velocity are needed for positioning axes, conveyors, or compact pick-and-place units. In those applications, stable feedback and low rotor inertia help the drive hold commanded speed and respond quickly to load changes. Integrated electronic commutation lets the motor synchronize with a drive amplifier without brushes, which reduces maintenance and supports compact installations that require responsive and repeatable movement. Its brushless design also avoids brush wear that can affect long-term speed consistency.

The frame follows the NEMA Size 34 standard, so its mounting face and pilot diameter align with common 3.4-inch square brackets. When supplied at up to 240 VAC, the windings have a nominal stall current of 5.4 ARMS, which helps set continuous torque limits and drive sizing. Rotor position is reported by a Hall sensor, which provides six-step commutation signals for mid-range speed control. This feedback method suits drive amplifiers that switch phase current at the proper rotor angle. Power and feedback exit through flying leads with AMP connectors, which simplifies wiring inside compact cabinets. The stainless-steel shaft has a round profile, allowing clamp or set-screw couplings without keyways.

This unit is classified as a Standard Motor, so it uses the baseline build for this product line rather than a custom winding or flange arrangement. It also uses a Stack Length Multiple 1 magnetic core. That short active stack reduces inertia during starts and stops, which helps the motor react quickly in small-axis applications and other motion systems that benefit from fast directional changes. The shorter magnetic stack also helps keep the motor compact along its axis, which can be useful where mounting space is limited.