Product Description:

The PMB33E-20216-02 is a brushless servo motor manufactured by Pacific Scientific and placed in the PMB Brushless Servomotors series. As a rotary actuator intended for closed-loop motion axes, it converts drive current into controlled torque and speed so that packaging machines, pick-and-place gantries, or indexing tables can synchronize movement with the master controller. Its integrated digital feedback and thermally protected winding make it suitable for continuous industrial automation duty where precise position tracking and long service life are required.

In electrical terms, the motor is categorized as a PMB Series Brushless Servomotor, meaning that it uses permanent-magnet rotor construction and requires a three-phase drive for operation. Phase conductors exit the housing as flying leads with MS connectors, allowing connection to panel bulkhead fittings without re-terminating factory wiring. The winding can sustain a maximum nominal stall current of 7.4 ARMS at 240 VAC, giving the allowable continuous current limit for torque calculations. The motor uses a NEMA Size 34 frame with an 8.50 mm pilot diameter and a four-bolt square flange. For commutation and servo loop closure, the embedded encoder delivers 4096 ppr, providing 12-bit resolution that yields angular accuracy of under 0.1°.

Mechanical power is transmitted through a square key machined on the shaft, allowing rigid coupling of pulleys or gears while helping prevent creep under reversing load. Rotor stack height corresponds to a length multiple of 3, so torque output is higher than that of shorter stacks in the same frame without changing mounting geometry. The feedback system uses a digital encoder with commutation, eliminating Hall sensors and enabling sinusoidal current control from the drive. A built-in PTC thermistor is embedded in the stator to signal the drive before critical winding temperature is reached, protecting both magnets and insulation during prolonged high-load cycles.