Product Description:

The Pacific Scientific PMB33C-20100-01 is an AC brushless servo motor in the PMB Brushless Servomotors series. As a direct-drive actuator for automated machinery, it converts commanded current into controlled torque and speed so indexing tables, pick-and-place heads, or small conveyors can maintain repeatable rotary motion. Pacific Scientific integrates the windings, rotor, and feedback transducer into a single housing, which simplifies cabinet wiring and reduces the number of separate components on motion axes driven by compatible digital amplifiers. Its compact servo format supports repeatable starts, stops, and direction changes in machines that require closed-loop rotary control.

The frame follows the NEMA Size 34 pattern, so its 3.4-inch square flange aligns with standard planetary gearboxes and bolt circles common on mid-torque stages. Power and feedback exit the rear of the housing through flying leads with AMP connectors, allowing quick crimp termination without a mating plug on the motor itself. Rotor position is measured by a resolver, providing angle feedback through the full electrical cycle and supporting use in harsh environments where optical encoders might fail. Under continuous stall, the stator draws 3.8 ARMS when supplied at 240 VAC, giving a clear reference for drive sizing and thermal management during low-speed, high-load operation.

Application-specific sealing is addressed by the factory-installed shaft seal, which limits lubricant egress and dust ingress along the output shaft. The drive end uses a square key to transfer torque, enabling rigid coupling to pulleys or timing wheels without relying on friction alone. Magnetic stack height uses a stack length multiple of 3, which balances the rotor’s inertia with continuous torque for indexing tasks and helps support stable response during rapid reversals. That behavior also helps maintain concentricity and reduces mechanical play in closed-loop positioning systems.