Product Description:

The PMB33F-20200-03 is a brushless servomotor manufactured by Pacific Scientific and supplied as part of the PMB Brushless Servomotors series. Within automated machinery, this motor converts drive current into regulated torque and speed so positioning loops can hold or advance loads with repeatable accuracy during indexing, transfer, and synchronized axis motion. The housing uses the standard NEMA Size 34 frame, which fits 3.4-inch square mounting patterns commonly found on packaging, pick-and-place, and indexing equipment.

At 240 VAC, the windings withstand a nominal stall current of 11.0 ARMS during locked-rotor conditions, which helps determine amplifier matching and thermal loading at zero speed. Rotor position feedback is provided by a resolver, so analog sine and cosine signals remain available at high temperatures and through electrical noise that could affect digital encoders in industrial cabinets. Power and feedback conductors exit as flying leads with MS connectors, which support shield continuity at the drive enclosure and provide a straightforward connection path. A stack length multiple of 3 increases the active iron and copper length, raising continuous torque without changing the front-face footprint of the motor.

The motor includes a shaft seal to help block oil or coolant ingress, and it also has an embedded PTC thermistor for over-temperature signaling. These protective elements support use in washdown enclosures and allow the drive to reduce current if winding temperature rises during extended duty cycles or low-speed operation. Mechanical coupling is handled by a square key machined into the shaft, which provides a positive interface with pulleys or gears and helps prevent slip under changing load conditions. This arrangement suits applications where the shaft must transmit torque to timing pulleys, pinions, or similar driven components.