Product Description:

The PMB31D-20101-03 is a brushless servomotor produced by Pacific Scientific within the PMB Brushless Servomotors series. Built for industrial automation, it converts electrical power into controlled rotary motion for indexing tables, packaging axes, and material-handling stations that require repeatable positioning over frequent start-stop cycles. When paired with a matched drive, the motor delivers fast acceleration and low maintenance because its permanent-magnet rotor eliminates brush wear and reduces routine service needs.

The motor has a NEMA Size 34 frame, so it shares mounting dimensions with other 3.4-inch square packages and fits common machine layouts in compact motion systems. A nominal stall current of 5.4 ARMS at 240 VAC is the continuous current the drive must supply to produce rated torque while the rotor is held stationary. Rotor position is detected by an integral Hall sensor, enabling six-step electronic commutation in basic control loops and standard servo applications. The output shaft uses a square key, allowing rigid, slip-free coupling to gears or pulleys without shaft slip. Power and feedback conductors exit as flying leads with AMP connectors, so field wiring can be completed quickly without custom crimping or special adapter hardware.

Factory options include a shaft seal and PTC thermistor. The seal helps limit contaminant ingress at the shaft opening, while the thermistor sends a thermal signal when winding temperature rises too high during operation. The electromagnetic stack uses a length multiplier of 1, which gives the shortest axial length available in this product line and helps keep rotor inertia low. The shorter body leaves more clearance behind couplings, guards, or adjacent machine components in compact installations. That format also reduces the axial space required behind the mounting face, which can help when the motor is installed inside enclosed machine sections with limited rear clearance.