Product Description:

The PMB33C-00100-02 is a brushless servomotor produced by Pacific Scientific for the PMB Brushless Servomotors series. It is intended for closed-loop axes where compact torque delivery and accurate speed regulation are required, such as in carton erectors, small gantry robots, and labeling heads. Resolver feedback allows the drive to calculate instantaneous rotor position, while the magnetically commutated design eliminates brush wear and supports continuous industrial operation.

This model is built on the NEMA Size 34 frame, which uses a 3.4-inch square mounting footprint that fits standardized gearboxes and slide actuators. At 240 VAC, it can hold its shaft stationary against load with a nominal stall current of 3.8 ARMS; the drive must therefore be sized to supply that continuous phase current without overheating. Power and feedback exit the housing as flying leads with AMP connectors, simplifying installation in tight cabinets by removing the need for right-angle plugs. A resolver is used instead of an optical encoder, allowing reliable operation in high-temperature or dusty environments because its signal is derived from transformer windings rather than light. The shaft is machined with a flat so couplings or pulleys can be secured with set screws to help prevent slip during bidirectional indexing.

Over-temperature protection is provided by a built-in PTC thermistor that rises sharply in resistance when winding temperature approaches its limit, so the drive can trip to help avoid insulation damage. The stack length multiple of 3 corresponds to a three-layer stator core, increasing torque density while keeping the frame size unchanged. This configuration gives the motor higher continuous load capability without extending its overall length, allowing it to fit the same mounting envelope as shorter stack variants.