Product Description:

The PMB33C-20200-01 is a brushless AC servomotor manufactured by Pacific Scientific and supplied within the PMB Brushless Servomotors series. Designed for compact motion axes, the motor converts drive current into controlled rotary output for pick-and-place heads, light conveyors, automated assembly fixtures, and similar light-duty positioning systems. Electronic commutation working with resolver feedback delivers repeatable position and speed regulation while eliminating brush wear, so it fits continuous-duty installations where replacement of contact parts would be undesirable. Its 34-frame envelope allows direct mounting in equipment with limited space, and the brushless design also avoids commutator dust inside enclosed machinery.

Wiring is supplied as flying leads that terminate in military-style MS connectors, so the cable entry can be sealed while the motor remains easy to disconnect when surrounding hardware must be moved. The housing follows the NEMA size 34 bolt pattern, enabling interchange with other 3.4-inch square motors in the same mounting class. Electrically, the phase windings draw 3.8 ARMS of nominal stall current from a DC link derived from 240 VAC. That current sets the minimum continuous output needed from the companion amplifier and helps determine conductor sizing to limit temperature rise in the motor leads and cabinet wiring. This wiring arrangement also works well where the motor cable must pass through compact conduit, panel openings, or protected cable paths.

A shaft seal helps prevent fluid ingress at the front bearing without increasing axial length, which is useful where splash or airborne contamination is present near the shaft. A laminated iron stack with a stack length multiple of 3 increases active magnetic volume, raising continuous torque over shorter variants while keeping rotor inertia moderate for responsive motion. Position sensing is handled by a shock-tolerant resolver, which supplies rotor angle information even in electrically noisy environments. Mechanical power leaves the motor through a keyed shaft with a square key, giving positive drive to pulleys or couplings under bidirectional load. The keyed output also supports stable torque transfer during repeated starts, stops, and reversing cycles.