Product Description:

The PMB33F-20216-03 brushless servomotor is manufactured by Pacific Scientific as part of the PMB Brushless Servomotors series. It is intended for mid-frame motion axes that demand repeatable torque, tight velocity control, and long service life. When integrated with a matched drive, the motor supplies closed-loop rotation so pick-and-place arms, indexing tables, or automated conveyors can hit programmed positions without overshoot, supporting consistent cycle times in industrial automation.

The frame is specified as NEMA Size 34, giving a 3.4-inch square flange that fits standard mounts. Feedback is provided by an optical encoder that resolves shaft movement to 4096 ppr, allowing controllers to command small incremental steps for precise registration cuts or label placement. On a 240 VAC bus, the stator sustains a nominal stall current of 11.0 ARMS, so the drive system must accommodate that continuous current. A digital encoder with commutation replaces separate Hall devices by delivering both position and phase information on a single cable set, which simplifies wiring. Power, feedback, and case ground exit as flying leads with MS connectors, and the circular metal shells lock with a threaded coupling that resists vibration while still allowing service access.

The motor includes a shaft seal and PTC thermistor; the seal limits lubricant escape and particulate ingress at the nose, while the thermistor provides winding temperature input for overload protection. Torque is transmitted through a shaft with a square key that mates with keyed hubs common on timing pulleys and gearboxes. The electromagnetic core uses a stack length multiple of 3, increasing active iron volume so the motor develops higher continuous torque than shorter stacks in the same frame. This combination suits packaging machinery, gantry axes, and general factory automation that require sealed shaft entry and continuous temperature monitoring.