Product Description:

The PMB31B-20101-02 is a brushless servomotor designed by Pacific Scientific for the PMB Brushless Servomotors series. In motion-control assemblies, it provides commanded angular displacement and speed so that indexing tables, pick-and-place heads, or light actuator stages follow precise trajectories from the paired drive. Its permanent-magnet rotor, low electrical inertia, and integrated sensors allow the motor to respond quickly to feedback signals, making it suitable for repetitive industrial automation cycles where accuracy and cycle time matter.

The motor uses the standardized NEMA Size 34 frame, which supports mounting on the common 3.4-inch square footprint. When locked in position at rated voltage, the winding draws up to 2.7 ARMS of stall current, a value used to size the power stage and cabling. Rotor commutation information is generated by a Hall sensor, enabling six-step or sinusoidal control without an external resolver. Power, feedback, and protective conductors exit the housing through flying leads with AMP connectors, which simplifies connection to pre-terminated harnesses. Mechanical output is delivered through a shaft machined with a square key, allowing positive torque transfer to pulleys or couplings without slip.

A factory-embedded PTC thermistor inside the stator gives the drive a direct temperature reference, so current can be limited before insulation temperatures rise too far. The electromagnetic core uses stack length multiple 1, which keeps the motor short and helps reduce mass and inertia during rapid starts and stops. This unit is a PMB series brushless servomotor intended for closed-loop motion applications that benefit from compact motor dimensions. Its compact magnetic package also helps the motor suit light axis applications that require quick acceleration and deceleration.