Product Description:

The PMB33C-20114-03 is a brushless servomotor manufactured by Pacific Scientific for the PMB Brushless Servomotors series. It serves as a rotary actuator in industrial automation, supplying closed-loop torque and speed control to precision assemblies such as indexing tables, packaging lines, and light machine tools. Its brushless construction supports repeatable motion during frequent starts, stops, and speed changes, which is important in machines that must hold accuracy over long production runs.

The motor follows the NEMA Size 34 mounting standard, so its face dimensions fit common U.S. servo gearheads and brackets. When powered from 240 VAC, it reaches a continuous current of 3.8 ARMS, which indicates the level the drive must supply during sustained operation. Position feedback is supplied by an optical encoder with 2048 ppr, giving the controller fine incremental resolution for smooth interpolation and stable low-speed control. Power, feedback, and commutation conductors exit the housing as flying leads with AMP connectors, which allows direct wiring without a separate terminal box. Mechanical output is transmitted through a square key shaft, so couplings and pulleys can transfer torque through positive engagement rather than friction alone.

A digital encoder with commutation provides both incremental position data and phase alignment for the motor, reducing the need for separate feedback devices. To extend service life in dusty or humid environments, the motor includes a shaft seal and PTC thermistor; the seal helps limit contaminant entry, while the thermistor signals an over-temperature condition to the drive. The laminated core uses a stack length multiple of 3, which gives the motor a moderate active length for its frame size. Within the PMB Brushless Servomotors series, this layout suits compact axes that need accurate feedback, protected shaft entry, and dependable continuous-duty operation.