Product Description:

The PMB33E-20100-03 is a brushless servomotor produced by Pacific Scientific within the PMB Brushless Servomotors series. As a rotary actuator for industrial automation, it converts drive current from a matched amplifier into controlled torque and speed for positioning or velocity regulation on packaging lines, pick-and-place gantries, and material-handling axes. It is intended for use with drives that support sinusoidal commutation, allowing smooth response during indexing, acceleration, and steady-speed operation.

The motor frame is NEMA Size 34, which provides a 3.4 in square mounting face commonly used in mid-torque installations. Its nominal stall current at 240 VAC is 7.4 ARMS, indicating the continuous phase current the drive must supply when the rotor is locked and torque is at its rated limit. Feedback is handled by a resolver, so the controller receives rotor position and speed information even during rapid acceleration. Power and feedback conductors exit the housing as flying leads with AMP connectors, enabling direct harness integration without a terminal box. For environmental protection, the configuration includes a shaft seal and a PTC thermistor; the seal helps block dust or lubricant ingress at the output journal, while the thermistor provides temperature-dependent resistance for over-temperature detection inside the windings.

The output shaft is machined with a square key, allowing positive torque transfer to a keyed hub while helping prevent slippage under shock loads. Torque density increases with electromagnetic stack length, and this unit uses stack length multiple 3, which adds active laminations without changing the frame size. The motor is a PMB series brushless servomotor and is intended for use with drives tuned for precise torque regulation. This combination of shaft style, feedback method, and thermal protection supports accurate motion in compact industrial axis assemblies.