Product Description:

The PMB31B-10100-02 is a brushless servomotor produced by Pacific Scientific and delivered within the PMB Brushless Servomotors series. It is a permanent-magnet motor that supplies closed-loop rotary motion for positioning axes and material-handling heads. This operating style suits automation tasks that require rapid torque rise and repeatable speed. Because the rotor uses permanent magnets, the drive can regulate torque quickly during starts, short indexing moves, and frequent speed changes.

Mechanical fit follows the NEMA size 34 frame code, so the motor can mount on equipment built for that bolt pattern. Power and feedback are routed through flying leads with AMP connectors, so the connection uses crimp-style mating plugs rather than a fixed receptacle. Rotor angle is reported by a resolver, which gives strong noise immunity for drives operating in industrial EMI environments and supports reliable feedback over long cable runs. Continuous thermal monitoring is provided by an embedded PTC thermistor, and the drive can reduce current if winding temperature rises toward the limit. Under a 240 VAC bus, the motor draws a nominal stall current of 2.7 ARMS, which helps with drive sizing because sustained operation at this current matches the continuous rated torque.

The mechanical output is a round shaft, which simplifies coupling to clamp-style hubs or timing pulleys without the stress concentration of a keyway. Magnetic stack height uses a stack length multiple of 1, indicating that this model has the shortest lamination stack in the series for reduced inertia and quicker acceleration. It is a PMB Series Brushless Servomotor, and that designation matches the winding and feedback arrangement used for this motor family. The shorter magnetic stack also helps the motor respond quickly in light-axis applications where fast reversal, low rotating mass, and stable feedback are more important than high continuous torque.