Product Description:

The PMB31D-20116-03 is a brushless servomotor produced by Pacific Scientific and belongs to the PMB Brushless Servomotors series. It is used in industrial automation for closed-loop positioning and speed control on axes that need compact torque output. The motor works with servo drives to convert electrical power into controlled mechanical rotation for robotics, packaging, and material handling equipment. This arrangement supports repeatable motion because the drive can continuously correct speed and position errors during operation.

Its feedback circuit relies on a 4096 ppr incremental encoder, allowing the drive to resolve fine angular increments for precise motion profiles. Because the encoder is incremental, the connected drive can track shaft movement in real time and maintain smooth motion during indexing. The frame is built to the NEMA Size 34 standard, so mounting holes and shaft height match common American flange patterns used on mid-range machinery. Under locked-rotor conditions at the rated bus voltage, the motor can sustain 5.4 ARMS of stall current for continuous torque at standstill. Commutation data is provided by a digital encoder with commutation, eliminating Hall sensors and simplifying wiring. Power is routed through flying leads with AMP connectors, which support quick connection to control cabinets without separate terminal blocks.

Mechanical coupling is handled by a square key on the output shaft, ensuring positive torque transfer to pulleys or couplings without slippage. Environmental protection is supported by a shaft seal and PTC thermistor; the seal limits ingress while the thermistor supplies temperature status to the drive for thermal shutdown routines. The temperature sensing path helps protect the windings during heavy cycling or stalled conditions. The lamination stack follows a 1 length multiple, which helps keep inertia low for rapid acceleration in pick-and-place axes. The short stack also supports quick response during repeated positioning moves.