Product Description:

The PMB31D-10214-02 belongs to the PMB Brushless Servomotors series manufactured by Pacific Scientific. It is a brushless servomotor intended for closed-loop motion axes in assembly cells and pick-and-place gantries. It is also suitable for other positioning tasks that require precise velocity and torque control. Its brushless design supports smooth electronic commutation and stable response during repeated indexing cycles.

Mechanical dimensions follow the NEMA Size 34 frame, so the motor mounts directly to standardized 3.4-inch square flanges. A nominal stall current of 5.4 ARMS at 240 VAC indicates the continuous current the drive must supply when the shaft is locked, which helps size the inverter and cabling for thermal limits. Position feedback is produced by an optical encoder that delivers 2048 ppr; this resolution translates to 8192 counts per revolution after four-quadrant decoding and supports sub-degree accuracy in servo loops. The integrated sensor is a digital encoder with commutation, which also provides real-time commutation signals so the drive can align stator currents without separate Hall boards. For overtemperature detection, a PTC thermistor is embedded in the stator winding, and its steep resistance rise near the knee temperature allows the drive to reduce current before insulation limits are exceeded.

Field wiring uses flying leads with MS connectors, so power and feedback cables can be mated without soldering in the cabinet. This connector style helps keep cable routing flexible where motor space is limited. The shaft has a round profile instead of a keyed design, making it suitable for clamp-style couplings that minimize radial stress on the bearings. The motor uses stack length multiple 1, which keeps inertia low for fast acceleration on small linear tables. It is compatible with SC900 and SCE900 servo drives used in many retrofitted lines.