Product Description:

The PMB33C-20201-03 is a brushless servomotor produced by Pacific Scientific for the PMB Brushless Servomotors series. It converts controlled three-phase stator currents into bidirectional torque, allowing accurate velocity and position loops in automated pick-and-place stations, small CNC tables, or conveyor zones. Eliminating brushes reduces wear particles, and electronic commutation supports the fast acceleration and deceleration required in automated equipment. The resulting torque response is useful where the control system must start, stop, and reverse direction repeatedly during short machine cycles.

It uses a NEMA Size 34 frame, so it mounts to standard 3.4-inch square flanges used in compact drive systems. The motor has a nominal stall current of 3.8 ARMS with an applied line voltage of about 240 VAC, which helps match the motor to a compatible amplifier. Rotor orientation is reported through an integral Hall sensor, providing commutation signals that let the drive energize the correct stator phase after power-up and support basic speed control without a separate encoder. The frame size also helps the motor fit common mounting hardware used on compact axis assemblies where available space is limited.

Electrical and auxiliary connections use flying leads with MS connectors, so the power, sensor, and thermistor conductors can be routed through flexible conduit and terminated with standard circular plugs. The motor includes a shaft seal and PTC thermistor; the seal helps limit contamination at the shaft end, while the thermistor can signal an overtemperature condition to the drive. Torque is transmitted through a square key on the output shaft, and the motor uses a stack length multiple of 3 for the active magnetic section. These features support secure shaft coupling and organized cable routing in machine sections that cycle frequently.