Product Description:

The PMB31D-10114-02 is a brushless servomotor produced by Pacific Scientific as part of the PMB Brushless Servomotors series. It is intended for industrial automation equipment that requires accurate motion control and stable closed-loop response. The motor converts electrical power into controlled rotary motion for positioning, speed regulation, and coordinated moves in automated packaging cells, pick-and-place axes, and light machining centers. Its brushless design also supports repeatable starts, stops, and speed changes during frequent duty cycles.

The motor uses a NEMA Size 34 frame, so its face mounting pattern aligns with common three-inch square motor brackets. Under locked-rotor conditions at 240 VAC, the winding may draw up to 5.4 ARMS. This value helps set current limits and conductor size for the connected drive system. Integrated feedback is handled by a 2048 ppr optical encoder, which gives the controller 2048 distinct positions per revolution and supports smooth sinusoidal commutation. Power and signal connections use flying leads with AMP connectors, and the motor uses a digital encoder with commutation so separate Hall tracks are not required.

A built-in PTC thermistor changes resistance sharply near the winding limit, giving the drive an early warning before insulation is stressed. This thermal signal helps the control system respond to overload conditions during repeated acceleration or low-speed holding. The output shaft is round, so couplings or pulleys clamp directly without keyway alignment. Magnetic stack depth is fixed at a multiple of 1, which corresponds to the base torque variant of the series and helps keep inertia low for fast indexing moves. The motor can be paired with vector drives that support automatic stall detection and temperature monitoring.