Product Description:

The PMB31D-00216-02 is a brushless servo motor built by Pacific Scientific within the PMB Brushless Servomotors series. Designed for closed-loop motion axes, it converts drive commands into accurate shaft positioning for pick-and-place devices, packaging lines, and other automated machinery. The motor supplies continuous torque without commutator wear, making it a low-maintenance actuator for systems that require precise speed regulation and repeatable positioning. Its brushless construction also helps reduce service interruptions in equipment that runs through frequent start-stop cycles.

Its frame uses the NEMA Size 34 format, giving a mounting face that aligns with standard 86 mm square motor brackets and simplifying retrofits. The shaft has a flat machined on one side so couplings can lock without keys, reducing assembly time. At a 240 VAC bus, the winding reaches a nominal stall current of 5.4 ARMS, which is the continuous current the servo drive must supply for peak torque at zero speed. Rotor position is measured by a 4096 ppr incremental encoder, and this fine resolution helps the controller hold intermediate positions with minimal dither. Power, feedback, and thermal leads exit the housing as flying leads with MS connectors, allowing quick loom integration without disassembly.

Thermal monitoring is provided by an embedded PTC thermistor that changes resistance rapidly near the winding’s upper temperature limit, enabling the drive to intervene before insulation is stressed. Commutation signals are derived from a digital encoder with commutation, so phase switching remains synchronized even during rapid acceleration. The motor is identified as a PMB Series Brushless Servomotor and uses a stack length multiplier of 1, which indicates a single lamination packet for moderate inertia and compact mass. In material-handling or light-machining stations, that combination helps the axis remain responsive during repeated acceleration and deceleration.