A high performance, robust and sensorless Natural Field Oriented controller for induction machine drives

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Natural Field Orientation (NFO) is a technique of field oriented control of AC machines that is potentially very robust, able to operate at low speeds, and inherently sensorless. However, it is a little known fact that under regenerative conditions the algorithm is unstable. The primary aim of this project is to develop a NFO algorithm that is stable under regeneration, and has minimum dependence on machine parameters. If these aims are achieved the NFO algorithm would be a significant addition to control algorithms for AC machines, allowing their use in a broader range of applications.