Product Description:

The PMB33E-20200-01 is a brushless servomotor built by Pacific Scientific as part of the PMB Brushless Servomotors series. It converts controlled electrical input from a matched drive into proportional mechanical rotation for axes that demand repeatable position, speed, or torque. In automated packaging lines, pick-and-place gantries, or index tables, the motor provides consistent servo performance while simplifying integration with standard motion controllers. The unit’s electromagnetic design supports closed-loop feedback so the host controller can correct for load disturbances and maintain cycle accuracy.

Its dimensional classification is NEMA size 34, so the mounting face and pilot diameter match commonly used 3.4-inch square frames in U.S. machinery. At a locked-rotor condition and with 240 VAC supplied by the drive, the winding draws a nominal stall current of 7.4 ARMS, a figure used to size the amplifier’s continuous current rating and power cabling. Rotor position is returned through a resolver, giving absolute angle information over one electrical revolution and allowing noise-tolerant feedback in harsh environments. Mechanical power is transmitted through a shaft machined with a square key, providing positive torque transfer to pulleys or couplings while helping prevent slip. Power and feedback exit the housing on flying leads with MS connectors, a field-wiring option that reduces installation time when motors must be cabled in place.

A customer-specified shaft seal surrounds the output journal so airborne fluids or dust cannot migrate into the front bearing cavity during wash-down cycles. The electromagnetic core uses a stack length multiple of 3, placing three lamination sections in series to raise continuous torque without altering the frame size. This layout keeps the motor compact while increasing active magnetic length for applications that need more torque from the same mounting envelope.