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Shape Optimization of Stator Teeth in Interior Permanent Magnet Synchronous Motors with Distributed Windings to Reduce Rotor Loss

In this paper, we optimize the shapes of stator teeth in interior permanent magnet synchronous motors with distributed windings to reduce rotor loss. In the optimization, the shapes of each tooth are determined by an automatic optimization under keeping the three-phase equilibrium. It is clarified that the rotor loss can be reduced by employing two stator tooth shapes alternatively along the circumferential direction. The variation in the optimal teeth shape with rotor shape is also clarified.