Sensorless motorcontroller using a negative sequence carrier signal controller

A negative sequence feedback circuit (26) is connected to monitor and minimize unbalances in a high-frequency ac carrier signal provided to a motor/load (22) for the purpose of detecting rotor position. The negative sequence feedback circuit detects unbalances in the high-frequency ac carrier signal and generates negative sequence feedback. The feedback is combined (30) with command signals (28) used to generate the high-frequency ac carrier signal, and the combination of the command signals with the negative sequence feedback is provided to an inverter (18) for generation of the high-frequency ac carrier signal, wherein the negative sequence feedback reduces unbalances in the resulting high-frequency ac carrier signal such that a balanced high-frequency carrier signal is provided to the motor/load.