Product Description:

The PMB31D-10100-03 is a brushless servomotor produced by Pacific Scientific for the PMB Brushless Servomotors series. This permanent-magnet unit is intended to drive linear or rotary axes in packaging, material handling, and light machining equipment where rapid position changes and repeatable speed regulation are required. As part of a closed-loop drive system, it converts three-phase power from a compatible servo amplifier into controlled torque so motion controllers can manage acceleration, hold commanded positions, and synchronize multiple axes within an automated cell. This operating role makes the motor suitable for indexing, feed control, and other coordinated motion tasks that depend on consistent response.

The frame follows the NEMA Size 34 mounting pattern, allowing direct interchange with other 3.4-inch square motors. Power is delivered through flying leads with AMP connectors, so field wiring can be completed without additional terminal blocks while strain relief remains at the cable exit. During static load conditions, the windings draw a nominal stall current of 5.4 ARMS, a value used to size the amplifier’s continuous output stage and upstream protection devices. Rotor position feedback is supplied by an embedded resolver, which tolerates vibration and temperature changes while providing angle information for commutation. That feedback supports stable low-speed control and reliable operation during frequent starts and stops.

The shaft has a round profile, allowing pulleys or helical couplings to be installed without keyway alignment. A flat or bonded hub can be added externally when the driven element requires a different attachment method. The motor includes a front shaft seal and an integrated PTC thermistor in the stator windings, helping limit dust entry and monitor thermal rise during demanding duty cycles. The motor uses a stack length multiple of 1, which gives it the shortest active core for lower inertia and quicker acceleration while keeping torque suitable for compact positioning stages.