PMB21D-30214-00 Pacific Scientific
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The Pacific Scientific PMB21D-30214-00 is a standard motor in the PMB Brushless Servomotors series with a NEMA Size 23 frame and a .25 inch diameter round shaft. This servomotor uses flying leads with MS connectors and features a 2048 ppr digital encoder with commutation. It has a nominal stall current of 5.4 ARMS at a maximum of 240Vac.
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Product Description:
The PMB21D-30214-00 brushless servomotor is produced by Pacific Scientific and is part of the PMB Brushless Servomotors series. In motion-control systems, the motor acts as a rotary actuator that converts drive current into consistent torque. It supports positioning and speed-regulated operation in automated machinery. Typical applications include conveyors, small gantries, and pick-and-place stations that require controlled rotary motion and repeatable axis performance.
The frame follows the NEMA Size 23 standard, so its 2.3-inch-square face mounts directly to commonly available industrial gearheads and brackets. The stator windings draw a nominal stall current of 5.4 A RMS when powered from a 240 VAC supply. This value supports drive amplifier selection and indicates thermal loading under locked-rotor conditions. Feedback comes from a digital encoder with a resolution of 2048 pulses per revolution, allowing the controller to command sub-degree angular movements without an external measuring device. The electrical connection uses flying leads with MS connectors, allowing cable length adjustment while providing termination through industry-standard circular connectors.
The motor has a stack length multiple of 1, indicating that a single lamination section is used to keep rotor inertia low for rapid acceleration. Its classification as a standard motor indicates that special shaft seals, coatings, and winding options are not included. The output interface is a 0.25-inch-diameter round shaft that connects easily to set-screw hubs or clamping collars without requiring a keyway. Rotor position and phase alignment are handled by the integrated digital encoder with commutation. The drive receives incremental position counts and Hall-effect transition signals, allowing it to establish the proper commutation sequence after power-up. The round shaft and compact frame also support direct integration into space-constrained motion assemblies where low inertia and straightforward coupling are important.
