Product Description:

The PMB31B-00200-03 is a brushless servomotor built by Pacific Scientific within the PMB Brushless Servomotors series. In industrial automation, this unit supplies controlled torque and speed to axes that require precise positioning. It is suitable for packaging tables, small gantries, or indexers tied to mid-power servo drives, where stable feedback and predictable motion are important during repeated cycles.

This motor follows the NEMA Size 34 frame standard, so its mounting pattern matches most U.S. 3.4-inch square flanges used on compact machinery. At a 240 VAC bus, the nominal stall winding demand is 2.7 ARMS, so drive selection should account for continuous current capacity during sustained holding or low-speed operation. Power conductors exit as flying leads with MS connectors, which provide a direct circular connection style and simplify routing in enclosed machine spaces. Rotor position is derived from a resolver, which provides angle feedback with strong noise immunity for closed-loop control and reliable operation near electrically noisy equipment. As part of the PMB Brushless Servomotors series, the motor shares the general mounting style and feedback approach used across the line.

Environmental protection is improved through the optional package that adds a shaft seal and PTC thermistor. The seal helps limit contaminant entry at the shaft, while the thermistor sends an over-temperature signal to the drive so protective action can be taken before the winding overheats. A flat output shaft transmits torque directly to pulleys or couplings without a key, which can help reduce play in low-inertia loads and supports simple coupling arrangements. The motor uses a stack length multiple of 1, which keeps the housing short and helps reduce reflected inertia on high-speed axes where compact length is useful.