Product Description:

The PMB31D-20200-00 is a brushless servomotor produced by Pacific Scientific. It converts three-phase electrical energy into regulated torque and speed for automation axes such as positioning tables, pick-and-place heads, and packaging machinery. Permanent-magnet excitation and electronic commutation let the motor respond quickly to command changes while maintaining repeatable motion during short, frequent cycles. Because brushless operation avoids mechanical commutator wear, it supports repeated cycling with consistent electrical switching. In servo applications, this helps the control loop maintain commanded speed and position during rapid starts, stops, and reversals.

The motor uses a NEMA Size 34 housing, so mounting follows a standardized four-bolt square pattern used in many industrial assemblies. Electrical access is provided through flying leads with MS connectors, which allows direct cable routing without opening the endbell. Its nominal stall phase current is 5.4 ARMS, indicating the continuous torque point before thermal limiting begins. Position feedback is supplied by a resolver, giving the drive the rotor-position information needed for commutation and speed regulation. Output torque is transferred through a shaft with a square key, which provides positive mechanical engagement for hubs, couplings, or pulleys. The keyed shaft helps reduce slip between the motor and the driven element when load direction changes abruptly.

The unit is configured as a standard motor, so it comes without special winding or sealing options. It uses a stack length multiple of 1, the shortest lamination set in the family, which helps keep inertia low during acceleration and deceleration. The short lamination stack also supports faster response in axes that reverse often or follow short indexing moves. The winding is intended for operation on 240 VAC mains without an additional transformer. The motor is identified as a PMB series brushless servomotor, and its baseline configuration suits general automation duty where compact size and predictable response are important.