Product Description:

The PMB33C-20100-02 is a brushless servomotor produced by Pacific Scientific within the PMB Brushless Servomotors series. Designed as an electromechanical actuator for closed-loop motion axes, it converts drive current into controlled rotary torque for positioning tables, packaging heads, and other industrial automation loads. The motor belongs to the modular PMB family, which offers different frame sizes, stack lengths, and feedback options for varying axis requirements. In typical systems, it mounts directly to planetary gearboxes or belt transmissions and works with digital drives that regulate current and velocity during operation.

The mechanical envelope follows the NEMA Size 34 standard, so the front face is about 3.4 inches square and fits gearhead adapters with the same bolt pattern. On a 240 VAC bus, the winding can sustain 3.8 ARMS of nominal stall current, which is the continuous current the drive may demand without thermal overload. Rotor position comes from a resolver, whose sine-cosine signals maintain accurate feedback in electrically noisy environments. Power and Hall leads exit the housing as flying leads with AMP connectors, removing the need for panel-mount sockets when the cable must pass through narrow drag chains. Torque reaches the load through a shaft with a square key, which provides a positive mechanical link between the motor and the driven component.

Thermal monitoring is supported through a PTC thermistor embedded in the windings, so the drive can respond before insulation temperature rises too far. The electromagnetic package uses a stack length multiple of 3, which combines three lamination sections to increase output torque while keeping the frame width unchanged. Because the mounting face remains within the same size class, the motor can provide higher torque without requiring a wider installation space. This arrangement is useful on closed-loop axes where compact mounting and continuous temperature supervision are both required.