Product Description:

The PMB33C-20214-03 is a brushless servomotor produced by Pacific Scientific for the PMB Brushless Servomotors series. This motor is intended for closed-loop motion axes where quick torque response and repeatable positioning are required in industrial automation cells, pick-and-place gantries, and packaging equipment. Within the series, the unit represents a mid-frame size that pairs with matched digital drives to translate electrical commands into tightly regulated mechanical movement.

The frame follows the NEMA Size 34 standard, so its mounting face and pilot diameter fit common U.S. servo brackets without adapter plates. On a 240 VAC bus, the winding draws a nominal stall current of 3.8 ARMS, indicating how much continuous phase current the drive must supply when the rotor is locked and holding load torque. Feedback is supplied by an optical encoder that generates 2048 ppr, giving the controller fine incremental information for velocity and position loops. Power, Hall, and feedback conductors exit as flying leads with MS connectors, which simplifies field termination while maintaining vibration-resistant engagement. The primary sensing element is a digital encoder with commutation, so the drive receives both incremental counts and the three Hall signals required for electronic commutation without separate sensors.

Mechanical power is transferred through a square key on the shaft, allowing rigid coupling to gears or pulleys while preventing slip under peak torque. The motor is factory-fitted with a shaft seal and PTC thermistor; the seal limits the ingress of splashed fluids, and the thermistor provides a temperature-dependent resistance signal that the drive can monitor for overload protection. Magnetic output capacity corresponds to a stack length multiple of 3, which means three lamination sections are installed to achieve the intended torque constant. This combination of features provides keyed power transmission, thermal monitoring, and added sealing in one motor package.