Product Description:

The PMB33F-00216-03 is a brushless servomotor manufactured by Pacific Scientific as part of the PMB Brushless Servomotors series. It supplies closed-loop rotational power in industrial automation systems, providing responsive torque and speed regulation for indexing, conveying, and general motion axes. Because it uses brushless construction, the motor supports smooth electronic commutation and avoids the brush wear associated with older motor designs. In a typical servo system, the motor works with a compatible drive that compares command signals with feedback and corrects speed or position errors in real time.

The motor’s physical envelope follows the NEMA Size 34 frame, which fits the common 3.4-inch face format used in many motion packages. Electrical feedback is supplied by a 4096 ppr incremental encoder, so the drive receives high-resolution position data for accurate control. Commutation data comes from a digital encoder with commutation, which removes the need for separate Hall sensors and reduces the number of feedback devices in the system. Power and feedback leave the housing through flying leads with MS connectors, allowing connection to matching MIL-style plugs. This arrangement keeps the power and feedback interfaces on the motor body rather than requiring a separate terminal box. At 240 VAC, the winding can sustain a nominal stall current of 11.0 ARMS, which indicates the continuous current the motor can carry at standstill without overheating.

The output end uses a flat shaft, which provides a simple way to couple set-screw hubs while maintaining concentric rotation. A shaft seal protects the front bearing area from oil mist and dust, and an embedded PTC thermistor provides temperature feedback so the drive can reduce output or shut down before the winding gets too hot. Magnetic capability is increased by a stack length multiple of 3, meaning three lamination sections are used to raise torque relative to shorter motors in the same frame. This longer active stack increases torque capacity without changing the motor’s mounting footprint.