Product Description:

The PMB33E-10201-02 brushless servomotor is produced by Pacific Scientific as part of the PMB Brushless Servomotors series. The unit belongs to the medium-torque class and is engineered for servo axes that require precise velocity and position control under closed-loop feedback. It is used in automated packaging lines, small transfer stations, and light machine tools where a compact footprint and consistent dynamic response are required. The motor can be coupled to belt drives, gearheads, or direct-drive lead screws, while a companion electronic drive supplies sinusoidal current and supervises thermal limits. Closed-loop operation allows the axis to respond predictably to changing load conditions.

Its frame corresponds to NEMA Size 34, enabling straightforward interchange with other 86 mm square motors. When energized from a 240 VAC bus, the winding has a nominal stall current of 7.4 ARMS, which marks the continuous torque limit during static holding. Field wiring exits through flying leads with MS connectors, so the housing does not need to be opened for cable attachment, and the connector shells help maintain sealing. Rotor position is detected by an internal Hall sensor, permitting commutation at start-up even when the shaft is stationary. Torque is transferred through a round shaft, which supports balanced coupling to low-inertia loads.

Over-temperature protection is supplied by a built-in PTC thermistor that presents a steep resistance increase once the winding reaches its rated threshold, allowing the drive to reduce current before overheating develops. The magnetic circuit uses a 3-stack length lamination, increasing active copper length to raise continuous torque without changing the mounting face. The motor uses rare-earth magnets for high torque density and minimal detent torque, which helps preserve smooth low-speed response. Its compact form keeps the motor within standard enclosure dimensions and fits installations where mounting space is limited.