Product Description:

The PMB31B-10200-03 brushless servomotor is produced by Pacific Scientific and belongs to the PMB Brushless Servomotors series. Classified as a three-phase permanent-magnet servomotor, it is used in industrial automation to deliver rapid, closed-loop positioning in pick-and-place units, packaging lines, and light material-handling axes. When paired with a compatible servo amplifier, it converts commanded current into precise rotary motion for indexing, transfer, and positioning tasks. Its compact construction suits motion systems that need accurate speed control and repeatable response during frequent starts and stops.

With a frame that matches the NEMA Size 34 pattern, the motor fits standard 3.4-inch square mounting faces without adapter plates or custom mounting hardware. The motor has a nominal stall current of 2.7 ARMS when used with a 240 VAC drive, so the amplifier must support that current continuously. Feedback comes from an integrated resolver, which provides rotor position feedback over a wide temperature range and resists electrical noise. Power and signal wiring exit the housing as flying leads with MS connectors, which provide keyed attachment and simplify cable routing in compact equipment.

Environmental and thermal protection are provided by a factory-installed shaft seal and PTC thermistor, which help block oil ingress at the output end and signal overheating in the windings. The output shaft uses a round profile, allowing couplings or pulleys to be pressed or clamped in applications where low backlash is important. The motor uses a stack length multiple of 1, which gives it a short rotor stack that supports low inertia and quick acceleration. Consistent pinouts and color codes across the product range help keep wiring straightforward in multi-axis installations where contamination control and thermal monitoring are important.