Product Description:

The PMB31B-10114-03 is a brushless servomotor manufactured by Pacific Scientific and supplied within the PMB Brushless Servomotors series. In automated positioning and velocity control systems, this motor converts commanded current into precise torque so that machinery axes can start, stop, and maintain speed under closed-loop control. Its electromagnetic design is optimized for rapid response, while the integrated feedback devices simplify pairing with digital servo drives used in pick-and-place modules, packaging equipment, and other motion platforms that require repeatable performance.

The frame follows the NEMA Size 34 standard, giving the motor a flange pattern readily accepted by common gearheads and mounting brackets. During continuous stall at 240 VAC, the winding draws 2.7 ARMS, so the drive must be rated to supply that current without clipping. Position feedback is generated by an optical encoder that delivers 2048 ppr, allowing motion controllers to resolve sub-degree shaft movement. Power and feedback leave the housing through flying leads with AMP connectors, which reduce panel depth and support straightforward connections. Rotor alignment signals are derived from a digital encoder with commutation, eliminating separate Hall sensors and simplifying wiring.

Factory customization adds a shaft seal and PTC thermistor, so the motor resists oil ingress while the drive can cut power if winding temperature rises toward its limit. The output uses a round shaft, enabling clamping couplers or timing pulleys without keyway stress concentrations. Magnetic stack height is set to the series baseline, expressed as a stack length multiple of 1, which keeps inertia low for fast acceleration. The motor is suitable for conveyors, indexing tables, and light-duty servo axes that need quick starts, stable feedback, and thermal protection.