Product Description:

The PMB33E-20200-03 is a brushless servomotor built by Pacific Scientific within the PMB Brushless Servomotors series. As a rotary actuator for industrial automation, it converts commanded electrical energy into precise mechanical motion so that positioning tables, feeders, or medium-torque conveyors can run under closed-loop control from a compatible drive. The brushless design supports repeatable response in applications that need accurate speed and position control over frequent duty cycles. It also avoids the brush wear associated with older DC servo constructions.

The frame is classified as NEMA Size 34, indicating a 3.38-inch square mounting face that fits standard U.S. motor brackets. Nominal stall current at 240 V AC reaches 7.4 ARMS. This is the continuous phase current the drive must supply when the shaft is locked and rated torque is required. Power and feedback terminations are provided through flying leads with MS connectors, allowing quick mate-and-lock wiring without an accessory junction box. Rotor position feedback comes from an integral resolver, whose analog sine and cosine signals let the controller track shaft angle during commutation. This feedback method is often used where rugged analog position signals are preferred in electrically noisy industrial equipment. The output shaft uses a square key so pulleys or couplings can transmit torque without slip under bidirectional loading.

Application flexibility is increased by the customization package that adds a shaft seal and PTC thermistor; the seal helps block coolant or dust from entering the front bearing, while the thermistor reports winding temperature so the drive can limit overloads. A stack length multiple of 3 gives the motor more active length and higher continuous torque than shorter stacks of the same diameter without changing the mounting footprint. Within the PMB Brushless Servomotors line, this configuration suits mid-range indexing axes that need a balance of torque output and rotor inertia. The sealed front end, resolver feedback, and keyed shaft also fit packaging and light material-handling systems where stable control and dependable coupling are required.