Capacitor-Start NEMA Frame General Purpose AC Motors
Capacitor-start NEMA frame general purpose AC motors are single-phase motors that use a capacitor to provide additional power during startup for higher torque than split-phase motors. They have a main winding and an auxiliary winding with a start capacitor for use in medium-to-high-torque requirements in auger drive, conveyor, shop tool, ventilation, and pump applications. Motors have NEMA frame construction with standard dimensions that allow drop-in replacement of motors from multiple suppliers with no modifications required to existing installations. Models usually have a single capacitor cover on the top or side of the motor shell that holds the start capacitor(s) and may also have a conduit box on one side that houses the electrical connections between the external power cables and the internal electrical wiring of the motor. The frame size for these motors is shown on the motor nameplate under “Frame” or “FR”.