Product Description:

The PMB33F-20201-02 is a brushless servomotor built by Pacific Scientific and supplied within the PMB Brushless Servomotors series. In automated machinery, this motor converts controlled electrical power into precise rotary motion that can be coordinated with drive electronics for positioning, speed control, or torque production on conveyor, indexing, and packaging axes. Its brushless design reduces wear associated with mechanical commutation and supports responsive servo operation in repetitive motion systems.

This model uses a frame classified as NEMA Size 34, which gives the motor a standardized 3.4-inch square mounting face that aligns with common gearheads and brackets. When fed from a 240 VAC amplifier, it can sustain a nominal stall current of 11.0 ARMS, indicating the continuous phase current the winding can accept without thermal overload while locked. Commutation and initial rotor position feedback are handled by an integrated Hall sensor, which supplies logic-level edge signals to the drive for sequencing its three-phase output. Power and signal conductors exit the housing as flying leads with MS connectors; this potted lead bundle simplifies installation by removing the need for internal junction blocks and maintaining environmental sealing. Winding protection is provided by a built-in PTC thermistor; once its resistance rises past a threshold, the drive can cut current to help prevent insulation damage.

Mechanical coupling is through a square key on the output shaft, allowing positive torque transfer to pulleys or couplings without relying on friction alone. The electromagnetic core is built with a stack length multiple of 3, which gives the motor a longer stator lamination stack than shorter variants in the same diameter. Built by Pacific Scientific, this unit is part of the PMB Brushless Servomotors series.