Product Description:

The PMB31D-00200-01 is a brushless servomotor manufactured by Pacific Scientific and assigned to the PMB Brushless Servomotors series. It serves as a compact rotary actuator for precision automation, converting controlled three-phase drive current into repeatable torque and position profiles for indexing tables, gantry axes, and packaging spindles. The integrated magnetic stack, bearings, and feedback device are enclosed in a sealed housing that supports closed-loop positioning in industrial environments. Its compact format also suits machines where installation space and repeatable response are both important.

The motor is built on a NEMA size 34 frame, giving it a 3.4-inch square flange that mates with standardized gearboxes and linear stages. Under locked-rotor conditions, it draws a nominal stall current of 5.4 ARMS from a 240 VAC bus, which helps set the current capacity of the matching amplifier and cabling. A rear-mounted resolver delivers rotor position feedback with high noise immunity, supporting stable velocity and torque control. Power and feedback wiring exit through flying leads with MS connectors, so the unit can be cabled without disassembly. Mechanical energy is transferred through a shaft machined with a flat, providing secure engagement with clamp-style couplings during rapid acceleration.

For abrasive or fluid-borne contaminants, the housing includes a factory-installed shaft seal, which helps protect the front bearing against ingress while retaining lubricant. The magnetic core uses a stack length multiple of 1, which keeps the motor short and helps reduce rotor inertia during frequent start-stop cycles. This layout follows the mounting pattern used across the PMB Brushless Servomotors line, so the motor can fit platforms that use the same flange footprint and connector clearance. The short stack also helps the motor suit axes that need quick reversal and low moving mass.