Product Description:

The PMB33C-20216-03 is a brushless servomotor manufactured by Pacific Scientific within the PMB Brushless Servomotors series. It is intended for closed-loop positioning and speed control in industrial automation where compact, high-torque rotary axes are required. By combining a permanent-magnet rotor with electronic commutation, the motor supports precise motion tasks in pick-and-place stations, indexing tables, and small gantry systems. Its compact format makes it suitable for machines that need accurate rotary motion without using a larger motor frame.

This model is built on the NEMA Size 34 frame, so it fits standard 3.4-inch square mounting patterns. At 240 VAC, the motor has a nominal stall current of 3.8 ARMS, which helps match it to compatible drive ratings. Position feedback is delivered by an incremental encoder with 4096 ppr, giving a usable angular resolution of 0.088° per count for tight servo loops. The feedback device is a digital encoder with commutation, so phase-switching information is included in the same package as the position signal. Power and feedback conductors exit the housing as flying leads with MS connectors, which support straightforward external connection at the motor.

Mechanical output is transferred through a square key shaft, providing positive drive engagement with pulleys or couplings. For added durability, the motor includes a shaft seal and PTC thermistor; the seal helps limit ingress, and the sensor can be used to monitor winding temperature. Torque capability is scaled by a stack length multiple of 3, which indicates three active lamination segments in the motor body. This longer magnetic stack increases torque density without enlarging the front mounting footprint, which is useful where space around the axis is limited. These features support stable operation in compact servo applications that require consistent feedback, protected shaft output, and thermal monitoring.