Product Description:

The PMB31D-00114-03 is a brushless servomotor manufactured by Pacific Scientific for the PMB Brushless Servomotors series. It is intended to deliver repeatable rotary motion in closed-loop industrial automation. Precise speed and position control allow it to support actuators, conveyors, and small transfer stations where consistent movement is required.

This motor is built on the NEMA Size 34 mechanical frame, so its 3.4-inch square mounting face matches standard gearheads and brackets without modification. Position feedback is supplied by an incremental encoder rated at 2048 ppr, allowing the controller to resolve small changes in shaft rotation and maintain tight positional tolerances during indexing and speed regulation. The feedback device is a Digital Encoder with commutation, and its commutation tracks provide the drive with rotor angle information without separate Hall sensors. A Flat shaft end is provided instead of a keyseat, so set-screw couplings can clamp directly to the shaft and maintain a compact connection. During stall at the rated bus of 240 VAC, phase current may climb to 5.4 ARMS, a value used when selecting overcurrent protection and cable size.

Electrical terminations exit the housing as Flying leads with AMP connectors, which reduces installation work because crimp contacts are already attached. The customization code includes Shaft Seal and PTC Thermistor; the seal helps limit dust or coolant ingress at the output end, while the thermistor provides thermal input so the drive can respond before the windings overheat. The motor is classified as a PMB Series Brushless Servomotor, so parameter sets are compatible with drives tuned for this family. Mechanical length follows a stack length multiple of 1, identifying it as the shortest magnetic stack available in this frame and helping reduce inertia for quick acceleration and deceleration.