Product Description:

The PMB31D-20114-00 is a brushless servo motor manufactured by Pacific Scientific and supplied within the PMB Brushless Servomotors series. As a permanent-magnet motor intended for closed-loop motion platforms, it converts drive current into controlled torque and speed for indexing tables, pick-and-place arms, and similar automation axes. The motor integrates an internal digital position sensor so that a servo drive can command precise moves while monitoring electrical commutation. This arrangement supports repeatable starts, stops, and direction changes in machines that rely on accurate axis response.

The frame follows the NEMA Size 34 standard, giving a 3.4-inch square mounting face that simplifies interchange with other devices that use the same bolt pattern. The nominal stall current is 5.4 ARMS at 240 VAC, which is the continuous winding current the drive must supply under locked-rotor conditions and a useful value when matching the amplifier to the motor. Rotor position is returned through a 2048 ppr incremental code generated by the integrated sensor, which gives 8192 quadrature-decoded counts per revolution for tight velocity and position control. The sensor is a digital encoder with commutation, so it provides both incremental counts and Hall-level signals without separate Hall boards. Power, feedback, and ground leave the housing on flying leads with AMP connectors, allowing quick connection to a cable harness without disassembling the motor.

A square key cut into the 0.500-inch output shaft helps prevent rotational slip between the shaft and couplings that transmit torque to belts or gears. The keyed shaft can be used with common hubs and couplings that rely on positive torque transmission. The unit is a standard motor, so its winding, feedback, and mechanical options follow the normal factory configuration rather than a special build. Its single lamination stack uses a stack length multiple of 1, which indicates the basic magnetic length for this version of the motor.