Product Description:

The PMB31B-10101-01 is a brushless servo motor produced by Pacific Scientific within the PMB Brushless Servomotors series. It is intended to deliver controlled torque and velocity in industrial automation axes that rely on closed-loop electronic drives using vector or trapezoidal control algorithms. By combining permanent-magnet excitation with electronic commutation, the motor supports repeatable motion in positioning tables, pick-and-place arms, and other equipment that requires accurate starts, stops, and speed changes.

For mechanical integration, the frame conforms to NEMA Size 34, allowing installation on machine faces that use the same 3.4-inch square mounting pattern. Power and feedback wiring exits as flying leads with AMP connectors, so the motor can be connected without a separate terminal housing. The output hardware is a round shaft, which suits clamp-style couplings and pulley hubs. Rotor position is reported by an internal Hall sensor, giving the receiving drive commutation signals for startup and low-speed control. During static load conditions, the motor draws up to 2.7 ARMS of nominal stall current at a 240 Vac bus. Moisture ingress at the front bearing is limited by a factory-installed shaft seal, which helps protect the bearing area in light splash or oily environments.

With a stack length multiple of 1, the motor uses the shortest core length available for this frame, which helps keep rotor inertia low for rapid acceleration. As a brushless servomotor, it avoids brush wear and reduces electrical arcing during repeated cycling. The motor uses permanent-magnet excitation and electronic commutation to produce controlled motion without mechanical contacts in the commutation system. This arrangement supports consistent operation in automated axes where compact size and responsive speed control are important.