Product Description:

The PMB31D-00101-00 is a brushless servomotor manufactured by Pacific Scientific for the PMB Brushless Servomotors series. It provides electrically commutated torque to conveyor sections, rotary actuators, and other automated hardware where precise positioning and speed stability are required. A matched drive supplies the three-phase excitation while the motor’s integral feedback signals close the loop, and its NEMA 34 mounting face simplifies installation on existing brackets without mechanical rework. This arrangement helps the axis maintain smooth response during starts, stops, and small speed corrections.

This unit is built on the NEMA Size 34 frame, giving the shaft center a 2.75-inch bolt circle that fits many mid-torque stages. Power and feedback exit through flying leads with AMP connectors, so cabinet wiring can be completed without custom pigtails. The winding is rated for a nominal stall current of 5.4 ARMS at a 240 VAC bus, which helps determine drive sizing and overcurrent protection. Rotor position is detected by digital transitions generated by the integral Hall sensor, enabling six-step commutation at startup before the controller switches to sinusoidal operation. Output torque is transferred through a flat shaft, allowing secure connection to clamp hubs or set-screw pulleys while avoiding keyway stress.

The motor is supplied as a Standard Motor, so winding resistance, insulation, and the cooling path follow baseline series values. The magnetic core uses a single lamination stack, shown by the Stack length multiple of 1, which helps keep inertia low for faster acceleration. Lower rotational inertia can improve response in axes that cycle frequently or reverse direction often. The unit is identified as a PMB Series Brushless Servomotor, which places it within the same product line as related motors and matching cable sets.