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This paper presents a novel sensorless control topology called floating frame controller (FFC) for driving synchronous electrical machines using an inverter. Position sensorless control of electrical machines used in aerospace applications is increasingly becoming important due to many system advantages including reducing cost and weight, increasing reliability, and the capability of working in harsh environments. A conventional synchronous machine typically uses rotor position sensors to provide information regarding the position of the machine's rotor with respect to the machine's stator windings. Rotor position sensors such as Hall Effect devices are typically mounted on the stator in close proximity of the stator windings. The rotor position sensors provide rotor position information, which allows for proper control for the conversion of power that is supplied to the stator windings of an electrical machine [1].