Product Description:

The PMB33C-00201-01 is a brushless servomotor built by Pacific Scientific in the PMB Brushless Servomotors series. Designed for mid-torque automation axes, it operates as the rotary actuator that closes the position loop between a motion controller and the mechanical load. By combining permanent-magnet excitation with electronic commutation, the unit supplies consistent torque with low maintenance requirements for material-handling stations, light machine tools, and inspection fixtures across factory lines. Because it is a brushless design, there are no brushes to wear during normal operation, which helps reduce routine service needs in repeated-duty motion systems.

At 240 VAC, the phase windings can sustain a nominal stall current of 3.8 ARMS. This is the continuous current limit that helps avoid thermal saturation while the rotor is locked. Rotor orientation data reach the drive through a three-phase Hall sensor, enabling six-step commutation without a high-resolution encoder. This feedback method supports basic commutation control when full encoder-based position resolution is not required. Power and feedback conductors emerge as flying leads with MS connectors, so cables can be routed through tight raceways before the mating plugs are attached. Magnetic flux is set by a lamination stack arranged in a length multiple of 3, balancing torque output against motor inertia for faster acceleration. For environments with airborne coolant or dust, a shaft seal can be used as a physical barrier that limits ingress along the output journal.

Mechanical integration centers on the frame coded as NEMA Size 34, a 3.4-inch square face pattern that matches standard servo gearheads and mounting brackets. The square mounting face allows direct installation on common machine plates and gearbox adapters without a custom bolt pattern. The output journal follows a flat shaft design, giving a broad reference surface for rigid set-screw coupling and eliminating keyway shear concerns in low-to-moderate torque work. This arrangement is well suited to compact servo assemblies that use direct couplings or small gearheads.