Product Description:

The Pacific Scientific PMB33F-20116-01 is a brushless servomotor in the PMB Brushless Servomotors series. It combines permanent-magnet rotor construction with electronic commutation to deliver repeatable torque for indexing tables, pick-and-place heads, and automated assembly lines. Integrated position sensing and a sealed housing allow the unit to serve as the primary rotary actuator, translating drive commands from a servo amplifier into controlled angular motion for multi-axis industrial machines. This format suits equipment that requires accurate starts, stops, and repeatable positioning across coordinated axes.

The frame follows the NEMA Size 34 standard, giving a 3.4-inch square face that fits common gearheads and brackets. Rotor position feedback is supplied by a 4096 ppr incremental encoder, and the fine pulse count supports smooth velocity loops at low speed. That transducer is a digital encoder with commutation, so the same feedback channel also produces the Hall-equivalent signals needed for phase switching. During static load conditions, the winding draws up to 11.0 ARMS at 240 VAC, a current level that affects drive sizing and cable ampacity. Power and feedback leave the motor through flying leads with AMP connectors, which simplifies inline splicing inside cabinet raceways.

The design also addresses mechanical coupling and environmental protection. A square key on the 0.500-inch output shaft helps prevent slippage under peak torque, and it supports torque transfer to couplings, pulleys, or small gear reducers without relying on friction alone. An optional shaft seal keeps coolant mist and fine particulates away from the front bearing. To increase torque without altering the mounting footprint, the motor uses a stack length multiple of 3, meaning three lamination stacks are assembled in the stator to increase the magnetic active length. This arrangement provides higher continuous torque within the same bolt pattern and housing face.