Product Description:

The PMB31B-00216-01 is a brushless servomotor produced by Pacific Scientific and delivered within the PMB Brushless Servomotors series. It serves as a rotational actuator in closed-loop motion systems, translating servo drive commands into accurate position or velocity for pick-and-place modules, feeders, and compact handling axes. The motor supports digital feedback and operates from mainstream 240 VAC servo drives. Its compact footprint also suits tightly spaced machine layouts where controlled starts, stops, and repeatable motion are required.

The motor uses a NEMA Size 34 frame, so its mounting face and pilot diameter align with common 3.4-inch industry patterns. Rotor position is relayed by an optical encoder with 4096 ppr, giving the controller fine angular resolution per revolution. The feedback device is a digital encoder with commutation, so it provides incremental counts along with Hall transitions for six-step or sinusoidal current control. Thermal loading at zero speed is limited by a nominal stall current of 2.7 ARMS, allowing continuous torque production when the shaft is held during indexing cycles. Power and feedback conductors exit as flying leads with MS connectors, which supports fast wiring in crowded panels and helps simplify cable routing around nearby components.

A shaft seal is fitted to help block coolant splash and dust from the front bearing cavity, which is useful in contaminated or washdown areas. Output torque is transferred through a flat shaft end that mates with compression hubs and reduces the chance of play during repeated cycling. The stack length multiple is 1, indicating the shortest lamination stack for this motor and helping keep rotor inertia low for light packaging and electronics handling axes. The Pacific Scientific platform uses shared cabling conventions, encoder pinouts, and mechanical envelope dimensions across the PMB family, which helps maintain consistency within the product line.