Abstract
This paper analyzes high-speed performance characteristics of fractional-slot concentrated-wound (FSCW) interior permanent magnet (IPM) machines during a multi-objective design optimization for achieving a high saliency ratio and a high efficiency. Tradeoffs between the high-speed performance characteristics and the saliency ratio and efficiency of an FSCW IPM machine in its design optimization are comprehensively discussed. It is shown that a predefined characteristic current significantly affects the maximum achievable saliency ratio and efficiency for FSCW IPM machines during a multi-objective design optimization process. A large-scale design optimization is performed leading to a family of optimal machine designs. The high-speed performance characteristics of these optimal designs are investigated, leading to proposing a criterion for the tradeoff between the high saliency ratio and efficiency and the high-speed performance characteristic. The results reported here provide a deeper insight into the optimal design of FSCW IPM machines with a high saliency ratio and a high efficiency.
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