Product Description:

The PMB31B-00114-03 belongs to the PMB Brushless Servomotors series from Pacific Scientific. It is a permanent-magnet, three-phase servomotor intended for closed-loop motion axes where rapid response and accurate position feedback are required. When paired with an appropriate drive, the motor supplies torque for indexing tables, pick-and-place heads, or other rotary loads in automated equipment. Its brushless design supports repeatable acceleration and deceleration during positioning tasks in compact industrial machinery.

The wiring exits through flying leads with AMP connectors, so installation can occur without a separate terminal box. A frame size of NEMA Size 34 gives the motor a 3.4-inch square flange that fits standard gearheads or machine plates. That mounting format helps the motor fit common brackets and coupling arrangements used on compact motion systems. Rotor position is measured by an optical encoder with 2048 ppr, giving the control loop 2048 discrete positions per shaft revolution for fine velocity regulation. During worst-case stall at 240 VAC, the phase current reaches 2.7 ARMS, so the selected drive must support that continuous current. The output shaft uses a flat shaft profile, providing a simple mating surface for set-screw couplings while keeping overall length to a minimum.

Feedback comes from a digital encoder with commutation, which carries both incremental data and the commutation tracks required by brushless amplifiers. Optional features include a shaft seal and a PTC thermistor; the seal helps limit contaminant ingress at the shaft, and the thermistor provides over-temperature indication to the drive. The motor uses stack length 1, so this frame is configured as a single-stack version. The encoder and thermistor signals allow the drive to manage commutation and thermal protection during sustained operation.