Product Description:

The PMB31B-00214-02 is a brushless servomotor manufactured by Pacific Scientific and supplied as part of the PMB Brushless Servomotors series. This motor is engineered to deliver closed-loop torque and position control for indexers, pick-and-place axes, and other small to mid-frame automation tasks. By coupling an internal encoder to its rotor, the unit supports precise electrical commutation and seamless integration with matched digital drives. Its compact form also helps it fit tightly spaced machine assemblies without sacrificing responsive motion control.

Its frame conforms to the NEMA size 34 standard, so mounting dimensions match common 86 mm square motor brackets used on conveyors and gantries. At a 240 VAC bus voltage, the motor can sustain 2.7 ARMS of stall current, indicating the continuous winding current that can be delivered without exceeding thermal limits. Position feedback is supplied by an optical encoder rated at 2048 ppr, which provides 8192 post-quadrature counts per revolution for fine velocity tuning and repeatable positioning. The feedback device is a digital encoder with commutation, meaning it outputs incremental signals plus Hall-sector markers used by the drive for sinusoidal current phasing. For electrical interfacing, the stator leads exit the housing as flying leads with MS connectors, allowing quick field wiring while preserving environmental sealing.

Thermal supervision is delivered by an embedded PTC thermistor, which rises sharply in resistance when coil temperature approaches the allowable limit and prompts the drive to reduce current. A machined flat on the stainless-steel shaft simplifies coupler clamping and helps prevent slip during high-torque reversals. The magnetic circuit uses a single lamination stack with a multiple code of 1, which balances torque density with compact axial length where rear clearance is limited. The motor fits compact servo axes where rear clearance is limited and a secure shaft connection is required.