Product Description:

The PMB31D-10216-01 is a brushless servomotor produced by Pacific Scientific within the PMB Brushless Servomotors series. As a compact rotary actuator, it converts drive current into controlled torque and speed for positioning, indexing, and coordinated motion in automated machinery and material-handling cells. By integrating a digital feedback device and matching windings, the motor delivers closed-loop performance suited for servo drives that demand repeatable response. Its compact form also helps it fit assemblies where mounting space around couplings, guide rails, and cable exits is limited.

This motor uses a NEMA Size 34 frame, which provides a standardized 3.4-inch square mounting face for many gearheads and linear stages. Under a 240 VAC bus, its nominal stall requirement is 5.4 ARMS, so the drive must supply that continuous phase current without exceeding thermal limits. Rotor position is returned by an optical encoder with 4096 ppr, enabling fine electronic commutation and steady velocity regulation at low speed. Power and feedback conductors exit as flying leads with MS connectors, which simplifies cable routing and allows the motor harness to be separated without opening the housing. Internal feedback uses a digital encoder with commutation, so the drive receives both incremental counts and phase information through the same interface. This arrangement supports accurate startup and works directly with compatible brushless amplifiers used in matched servo systems.

A shaft seal helps limit lubricant migration and blocks airborne contaminants from the front bearing, which is useful in dusty or debris-prone equipment. The output end uses a round shaft, making alignment straightforward when clamp couplings or timing pulleys are installed. The motor has a stack length multiple 1, which keeps rotor inertia low for frequent acceleration and deceleration cycles while still supporting the rated continuous torque range. This shorter magnetic stack can be useful where the axis must reverse often and where a compact motor body helps preserve clearance around nearby machine components.