Product Description:

The PMB31B-20201-00 is a brushless servomotor produced by Pacific Scientific for the PMB Brushless Servomotors series. This three-phase permanent-magnet unit is designed to supply precise bidirectional torque in automated machinery where closed-loop speed or position control is required. When paired with a compatible servo drive, the motor positions loads quickly and maintains synchronization with controller commands, making it suitable for material handling gantries, indexing conveyors, and light assembly stations. Its brushless design also supports accurate acceleration and reversal in applications that change direction often during normal operation.

Its frame is classified as NEMA Size 34, giving the motor a 3.4-inch square mounting face that fits standard servomotor flanges. Power exits through flying leads with MS connectors, so field wiring can be completed by mating the pre-terminated leads to panel receptacles rather than opening the motor housing. A continuous electromagnetic load of 2.7 ARMS at 240 VAC represents the nominal stall current, which indicates the current needed to hold rated torque without rotor motion. Rotor position for electronic commutation is generated by the integrated Hall sensor, and output torque is delivered through a shaft machined with a square key for positive engagement with couplings or timing pulleys. This arrangement supports dependable commutation and secure torque transfer during repeated start-stop cycles.

This model is identified as a Standard Motor, so it uses standard dimensions and winding tables rather than a custom build. Its magnetic assembly uses a stack length multiple of 1, the shortest stack in the family, which helps keep inertia low for responsive acceleration. The motor is part of the PMB Series Brushless Servomotor line and uses the general mounting and feedback arrangement found across that range. It is well suited to compact automation equipment where quick response and repeatable motion are important during repetitive duty.