Product Description:

The PMB31D-20214-00 is a brushless servomotor developed by Pacific Scientific within the PMB Brushless Servomotors series. It is intended for closed-loop motion axes where quick acceleration, repeatable positioning, and lower maintenance are required compared with brushed designs. Because the motor uses a brushless design, there are no brushes to wear during normal operation. That reduces routine wear items and helps keep servicing intervals predictable. In industrial automation, it couples to a matched drive to translate electrical torque commands into mechanical rotation for actuators, indexing tables, or packaging spindles.

Its power conductors and feedback leads exit the housing as flying leads with MS connectors, so installation only requires mating circular plugs rather than opening the motor. A 2048 ppr incremental encoder mounted at the rear provides position data at every 0.176° of shaft movement, while the commutation tracks align the phase sequence for start-up. The frame follows the NEMA Size 34 footprint and uses a 3.4-inch square flange. Under a maximum 240 VAC bus voltage, the motor can sustain a stall current of 5.4 ARMS, a figure used to size the drive amplifier and thermal monitoring. Rotor feedback and commutation are both managed by the integrated digital encoder with commutation, which keeps the feedback package compact.

The motor variant supplied here is the standard motor configuration, meaning no custom windings or mechanical adaptations are present. Output torque is transmitted through a shaft that uses a square key, giving positive engagement with pulleys or couplings. Magnetic length is established by a stack length multiple of 1, so dynamic characteristics match the base torque chart for the series. Within the PMB Brushless Servomotors series, this combination keeps inertia moderate for repeated indexing and positioning duty.