Product Description:

The PMB31B-10201-03 is a brushless servomotor manufactured by Pacific Scientific and supplied within the PMB Brushless Servomotors series. It provides rotary actuation for positioning, speed, and torque loops in automated machinery, packaging equipment, and material-handling axes where controlled motion must remain consistent across repeated cycles. By combining permanent-magnet excitation with electronic commutation, the unit delivers repeatable motion profiles, and its NEMA mounting pattern supports straightforward installation in existing servo drive systems.

The motor frame follows NEMA Size 34, which uses a 3.4-inch square mounting face that matches standard pilot dimensions. Its nominal stall current at 240 Vac is 2.7 ARMS, which is the continuous phase current a drive must sustain when the rotor is locked under rated thermal limits. Rotor position is detected by a Hall Sensor, which enables six-step commutation without an encoder for basic feedback. The motor uses a round shaft at the front flange and couples directly to gears or pulleys when keyways are not required. Power and feedback conductors are supplied as flying leads with MS connectors, which eliminate the need for a terminal box and shorten installation time.

Additional protection is provided through the factory-fitted shaft seal and PTC thermistor; the seal limits particulate ingress at the shaft, while the thermistor supplies temperature feedback for drive-based derating. Magnetic output is set by a stack length multiple of 1, which is the shortest stator option, so inertia and mass remain low for axes that demand rapid acceleration. This PMB Series Brushless Servomotor uses winding constants and mechanical geometry that match larger stack variants in the line. The unit is supplied by Pacific Scientific and uses common torque delivery, thermal monitoring, and connectorization features across the product line.