Product Description:

Pacific Scientific manufactures the PMB31B-00200-00 brushless servomotor as part of its PMB Brushless Servomotors series. The unit is a three-phase permanent-magnet motor intended for point-to-point positioning and moderate-speed process tasks in automated assembly cells, packaging axes, and material-handling equipment. When paired with a compatible servo drive, it supplies commanded torque and speed so the mechanical load follows the motion profile set by the control system. That makes it suitable for axes that need repeatable starts, stops, and short indexing moves during normal production. Its frame size also matches common industrial mounting patterns, allowing it to fit NEMA-pattern equipment without redrilling.

The motor body follows the NEMA Size 34 envelope, meaning the flange measures 3.4 inches square and shares bolt spacing with other devices in that standard. With a supply based on up to 240 V AC line input, the winding has a nominal stall current of 2.7 ARMS, which corresponds to the continuous torque point before thermal limits are reached. Power is routed through flying leads with MS connectors, so installation uses mating military-style plugs rather than opening the housing. Rotor position is reported by a resolver, which provides analog sine-cosine feedback that remains accurate in electrically noisy environments. This type of feedback also supports stable position information where signal interference would be a concern. A flat shaft end simplifies coupling because set-screw hubs can clamp directly onto the milled surface without using keys.

The unit is offered as a Standard Motor, which means it does not include special windings or added environmental options. Its stack length uses a single lamination set, helping keep inertia low for responsive starts and stops while staying within the stated current range. The standard configuration keeps the thermal and insulation behavior aligned with the base version of this motor family. The short stack also helps the motor respond quickly on light to moderate loads without adding unnecessary length to the housing.