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Asymmetrical Design in Electrical Machines

This paper investigates asymmetrical designs for electrical machines, specifically focusing on permanent magnet motors. Three different asymmetrical design methods are introduced, including the stator asymmetry, the rotor asymmetry and the unity motor asymmetry. Three design examples based on the unity motor asymmetry concept are provided. Design examples highlight the benefits of the asymmetrical design in terms of reduced cost and torque ripple as well as improved sensorless control performance.