Product Description:

The PMB31D-00201-03 is a brushless servomotor produced by Pacific Scientific and assigned to the PMB Brushless Servomotors series. This rotary unit is sized for installation in mid-frame motion stages, indexing tables, or light conveyor axes where rapid acceleration and repeatable positioning are required. When paired with a compatible servo amplifier, it converts electrical input into controlled mechanical torque for automated machinery. Because the motor is intended for closed-loop use, the drive can regulate speed and position as process loads change during normal machine cycles.

The motor uses the NEMA Size 34 outline, so it fits housings, gearheads, and mounts designed for that standard. Under a maximum of 240 VAC excitation, the winding can sustain a nominal stall current of 5.4 ARMS. That current level indicates the continuous stall load the amplifier must support without overloading the winding. Power and feedback lines exit as flying leads with MS connectors, which support secure electrical connection and orderly cable routing. Rotor position is reported through a Hall sensor, allowing six-step commutation in compatible control loops. This feedback method supports basic electronic commutation and stable speed transitions in general industrial motion systems.

The winding stack uses a single-layer depth with a stack length multiple of 1, which helps keep rotor inertia low during speed changes. This short stack arrangement supports responsive acceleration and deceleration in axes that need quick directional changes. A shaft seal and PTC thermistor package is fitted to limit lubricant migration and provide thermal signaling to the drive. The thermistor signal allows the control system to respond if motor temperature rises during operation. Output torque is delivered through a flat shaft, which is commonly paired with set-screw or clamping-style couplings in compact motion assemblies.