Product Description:

The PMB31D-00101-02 is a brushless servomotor produced by Pacific Scientific and included in the PMB Brushless Servomotors series. Designed for closed-loop motion axes, it delivers precise torque to positioning tables, pick-and-place heads, and other cyclic loads in automated machinery. It is suited to repetitive indexing and short-cycle positioning where stable servo response is important. Its compact PMB architecture supports responsive rotary actuation on 240 Vac bus drives while keeping the package size manageable.

Mechanical framing is sized to the NEMA Size 34 envelope, so the mounting face aligns with the standard 2.75-inch pilot pattern found in many motion stages. Continuous thermal loading at 240 Vac is limited by a nominal stall current of 5.4 ARMS, which helps match the motor to a compatible drive module and circuit protection. Power and feedback conductors exit the stator as flying leads with AMP connectors; this tether style eliminates an integral connector shell and allows direct routing through tight raceways. Rotor position feedback is provided by a Hall sensor, giving 60-electrical-degree signals for commutation at startup and low speed. This arrangement keeps wiring simple in compact machine spaces and supports reliable low-speed motor control.

The output shaft carries a flat on one side, letting clamp couplings transmit torque without a key while preserving concentricity. Winding protection is enhanced by the built-in PTC thermistor, whose sharp resistance increase enables the drive to shut down before excessive temperatures occur. Electromagnetic characteristics use a lamination pack with a stack length multiple of 1, so speed, torque, and inertia values correspond to the base tables without scaling. That base lamination length keeps published performance data directly applicable to this motor configuration.