PMB31D-20214-01 Pacific Scientific
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The Pacific Scientific PMB31D-20214-01 is part of the PMB Brushless Servomotors series and is a NEMA Size 34 brushless servomotor. It features flying leads with MS connectors, a shaft seal, and a square key shaft design. This servomotor uses a digital encoder with commutation and provides an encoder resolution of 2048 pulses per revolution.
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Product Description:
The PMB31D-20214-01 is a brushless servomotor built by Pacific Scientific within the PMB Brushless Servomotors series. As a rotary actuator, it converts electrical energy from a matched drive into controlled mechanical output and supports closed-loop position and velocity control for indexing tables, pick-and-place arms, and other automated axes. The motor is intended for applications that require responsive motion and repeatable positioning, with stable tracking during starts, stops, and rapid direction changes. This makes it suitable for automation systems that need accurate movement at varying speeds without excessive overshoot or settling time.
Power and signal conductors exit the housing through flying leads with MS connectors, allowing direct connection to cabinet wiring without intermediate terminal blocks. Position feedback comes from an incremental encoder with 2048 ppr, and the digital encoder with commutation supplies rotor-angle information for proper phase alignment during startup. The feedback arrangement allows the drive to monitor motion continuously during acceleration, deceleration, and steady-state operation. The housing follows NEMA Size 34, so it fits mounting patterns commonly used for motors of this face size. When operated from a 240 VAC drive, the winding has a nominal stall current of 5.4 ARMS, which indicates the continuous current level required for holding torque or very low-speed operation.
A shaft seal is fitted at the output end to help block coolant splash and airborne contaminants from reaching the front bearing. Torque is transmitted through a square key on the shaft, which helps secure pulleys or gears against slip during load changes. The stack length multiple is 1, giving this model the shortest magnetic core in the family and helping keep rotor inertia low for quick acceleration. This arrangement supports compact machine layouts where contamination control and secure shaft coupling are both important. The motor is a PMB Series Brushless Servomotor and is intended for use with compatible Pacific Scientific drives.
