Product Description:

The PMB31B-10101-00 is a brushless servomotor manufactured by Pacific Scientific and assigned to the PMB Brushless Servomotors series. Within automated assembly lines, pick-and-place gantries, or indexing tables, this motor converts commanded current into rapid, position-controlled rotation that drives belts, lead screws, or gears. As part of closed-loop motion axes, it operates with an electronic drive that sequences commutation signals according to rotor feedback. This arrangement lets the motor respond quickly to changing load commands while maintaining accurate axis positioning during repeated cycles. The brushless design removes mechanical contact wear, which helps extend maintenance intervals during continuous industrial duty.

The frame follows the NEMA Size 34 outline, so mounting holes and pilot diameters match standard 3.4-inch flange hardware used in many servo gearboxes and brackets. The flange pattern also helps the motor fit brackets and reducers that already accept this common frame size. At 240 Vac, the motor draws a nominal stall current of 2.7 ARMS, which is the phase current required to hold full rated torque without shaft movement; this value is important when sizing the matched amplifier's continuous current channel. Rotor position is detected by a three-phase Hall sensor, which provides 60 electrical-degree increments for trapezoidal commutation at startup or low speed. Power, feedback, and ground conductors exit the stator as flying leads with AMP connectors, which avoids a fixed receptacle and supports direct routing through tight cable tracks.

Mechanical integration is simplified by the round shaft, which mates with clamp couplings or pulleys without keyway alignment steps. Electromagnetic output uses a single lamination set because the motor has a stack length multiple 1 code, which keeps inertia low for quick acceleration in light tooling axes. This format suits applications that need fast starts and stops without excessive rotor inertia. The unit is supplied as a standard motor, so the winding, bearing, and sealing arrangement follows the default build for this product line.