AC motors with integrated VFD's feature a compact chassis-mounted, hardwired variable frequency drive. The integrated VFD allows fine adjustments to the motor's output RPM without additional equipment. These motors may have an additional protrusion on the motor shell such as a conduit box that houses the electrical connections between the external power cables and the internal electrical wiring of the motor. They have NEMA frame construction with standard dimensions that allow drop-in replacement of motors from multiple suppliers with no modifications required to existing installations. The frame size for these motors is shown on the motor nameplate under “Frame” or “FR”.