Product Description:

The PMB31D-20216-00 is a brushless servomotor produced by Pacific Scientific for the PMB Brushless Servomotors series. The unit provides closed-loop rotary motion for positioning tables, pick-and-place heads, and other automated axes in industrial equipment. It integrates into drive systems that operate on 240 VAC bus voltages and delivers torque at zero speed for holding or indexing tasks common in material handling and electronics assembly. Its brushless design supports repeatable starts, stops, and low-speed operation in machines that require accurate servo response through frequent duty cycles. This operating profile also suits applications that alternate between standstill holding and short indexed moves.

The frame follows the NEMA size 34 standard, so its flange pattern and pilot diameter match common U.S. mounting hardware. At instantaneous stall on the rated bus, the winding draws up to 5.4 ARMS, a value used for drive selection and thermal planning. Feedback is supplied by a 4096 ppr incremental encoder, giving 12-bit native resolution for position loops that need sub-degree accuracy. Power and signal conductors exit through flying leads with MS connectors, which simplifies cable routing in compact enclosures while preserving MIL-style sealing. The shaft has a square key slot, so torque is transmitted without relying on friction alone during reversing or indexing duty. The standard frame format also helps the motor fit existing machine layouts without custom adapter plates.

The motor is supplied as a standard motor, so it uses the regular winding and mechanical option set for this product line. Motion feedback and commutation cues are supplied by a digital encoder with commutation, so the drive receives both incremental counts and timing signals from a single package. This arrangement keeps the feedback system compact and avoids the need for a separate commutation device. The rotor uses a stack length multiple of 1, which gives the motor moderate inertia for responsive acceleration and stable speed regulation.