Product Description:

The PMB33E-20201-01 brushless servomotor is produced by Pacific Scientific and belongs to the PMB Brushless Servomotors series. It is built for closed-loop motion tasks in industrial machinery where accurate speed regulation and bidirectional positioning are required. By using permanent-magnet excitation and electronic commutation, the motor provides smooth torque for conveyor sections, pick-and-place axes, and light-duty actuators in assembly cells. Integration with digital drives allows rapid acceleration and tight velocity control without the mechanical brushes that would otherwise limit service life.

The frame size is NEMA Size 34, so the mounting face measures 3.4 inches square and fits standard pilot holes on compact equipment. Under a 240 VAC supply, the motor draws 7.4 ARMS at stall, which is used to size the power stage and thermal protection. Power and feedback exit the stator through flying leads with MS connectors, providing a compact connection method with MIL-style pin reliability. Rotor position is detected with an internal Hall sensor, so the drive receives six-step commutation signals for startup and low-speed operation. Rotary torque is delivered through a square key on the output shaft, allowing direct coupling to pulleys or gear hubs without slip.

Performance is influenced by a stack length multiple of 3, which increases the active iron length and raises continuous torque compared to shorter variants. For environments where oil mist or fine dust are present, a shaft seal is fitted at the flange to limit ingress along the shaft-hub interface. The motor is a PMB Series brushless servomotor, indicating compatibility with standard servo drives that match its electrical characteristics. This arrangement supports stable operation in applications that require responsive speed control and repeatable positioning.