Product Description:

The PMB33E-20200-00 is a brushless servomotor manufactured by Pacific Scientific and belongs to the PMB Brushless Servomotors series. As a closed-loop rotary actuator, the unit converts drive current into controllable torque and speed for positioning axes, indexing tables, or packaging machinery in industrial automation. The motor integrates a permanent-magnet rotor with three stator laminations and is designed to operate with matched digital amplifiers for precise velocity and position control. This arrangement supports repeatable motion where rapid starts, stops, and directional changes are required.

The mechanical footprint matches the NEMA Size 34 frame, so it aligns with standard 2.75-inch pilot diameters and bolt circles used on existing mounts. That format helps the motor fit common machine plates and couplings without custom adapter hardware. With a 240 VAC bus, the coils support a nominal stall current of 7.4 ARMS, which is the primary limit for continuous torque when airflow is constrained. A radiation-hardened Resolver mounted on the rear supplies position feedback in environments where optical encoders might fail. Power, signal, and ground exit the stator as flying leads, allowing harnesses to be trimmed to exact length and giving flexibility when routing wiring through tight enclosures. Rotary torque is delivered through a square key milled into the 0.500-inch shaft, helping prevent slip under reversing loads.

Because the unit is ordered as a Standard Motor, it ships with the default winding, magnet grade, and bearing set for this product line. The stator stack length multiple of 3 increases the axial iron volume, raising continuous torque without altering the outer frame. Connections use threaded MS connectors on the lead ends, so cables can be replaced without re-terminating pins, and the threaded connection helps keep mating cables secure during vibration and repeated machine motion. The amplifier's stall current setting should match motor capability to help prevent thermal saturation under locked-rotor conditions. That relationship is important when the shaft is held stationary under load.