Abstract
This paper investigates optimal design of shoe shape so as to reduce cogging torque of variable-flux (surface permanent magnet synchronous motor) SPMSM using two type of magnets. First, it suggests numerical analysis method of cogging torque of motor organized by two types of magnet. With the numerical method, it designs shoe shape of stator that cogging torque is minimized. Finally, it verifies effectiveness of design using the finite-element analysis.
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