Product Description:

The PMB31B-10216-01 is a brushless servomotor built by Pacific Scientific for the PMB Brushless Servomotors series. It converts drive current into controlled torque and speed so closed-loop axes in packaging machinery, pick-and-place gantries, or indexing tables can position quickly and repeatably. The motor’s brushless construction eliminates commutator wear, and the compact frame allows direct integration into equipment racks or machine frames where reliable servo performance is required under 240 V class drives.

The stator and housing conform to the NEMA Size 34 outline, so the flange pattern matches common 86 mm interfaces and supports straightforward mounting. Power exits the case through flying leads with MS connectors, giving secure connections for power and feedback wiring while helping preserve shielding. When a 240 VAC drive applies current, the motor can withstand a continuous stall draw of 2.7 ARMS, which marks the thermal limit for steady zero-speed holding torque. Rotor position feedback is supplied by a 4096 ppr incremental encoder, and its integrated index plus three commutation tracks form a digital encoder with commutation for sinusoidal or trapezoidal drive algorithms. Output torque is transmitted through a round shaft that accepts clamp hubs or couplers without keyways.

The unit has a shaft seal, which protects the front bearings from splash and airborne particles often present in food-processing conveyors or coolant-exposed machine tools. Magnetic length is set by a stack length multiple of 1, giving the shortest active core and therefore the lowest inertia option in the family, which suits rapid-acceleration axes that rely on tight velocity loops. It is a PMB Series Brushless Servomotor intended for compact motion systems where low inertia and stable feedback are both important.