Product Description:

The PMB33E-20201-02 brushless servomotor is manufactured by Pacific Scientific for the PMB Brushless Servomotors series. It is built to convert controlled three-phase power from a matched servo drive into tightly regulated shaft motion for pick-and-place modules, web tension stations, and general-purpose industrial axes. Electronic commutation and integrated rotor position feedback allow the motor to deliver repeatable torque and velocity without the maintenance required by brushed designs, making it an adaptable drive element in automated production equipment for material handling and light machining lines.

With a frame designation of NEMA Size 34, the motor shares mounting dimensions with standard stepper and servo products, simplifying mechanical integration. During locked-rotor load tests at 240 VAC, the windings draw a nominal stall current of 7.4 ARMS, which helps size fuses, drive transistors, and cabling for continuous hold conditions. Rotor orientation is provided by three-phase Hall sensors embedded in the stator, supplying 120-degree signals that the controller translates into commutation timing. Power and feedback exit the housing through flying leads with MS connectors, so field wiring can be completed quickly without disassembling the end bell.

The shaft uses a square key to transmit torque to pulleys or couplings without relying on friction alone, which reduces the chance of slippage during acceleration. Magnetic length is extended by a stack length multiple of 3, allowing higher continuous torque than shorter stacks in the same frame. Thermal monitoring is provided by an integrated PTC thermistor that changes resistance steeply near the allowable winding temperature, enabling drive shutdown before insulation limits are exceeded. The motor is built by Pacific Scientific and belongs to the PMB Brushless Servomotors series.