Optimal Shape Design of Permanent Magnet for PM Synchronous Motors Cogging Torque Reduction using Improved ( ${\mu}$ + ${\lambda}$ ) Evolution Strategy and FEM

유한요소법과 개선된 ( ${\mu}$ + ${\lambda}$ ) Evolution Strategy를 이용한 PM동기 전동기 Cogging Torque저감을 위한 영구 자석 최적 설계

The analysis of the permanent type synchronous motor is performed by using the finite element method (FEM). The optimal design of the permanent magnet is presented for minimizing cogging torque in this paper. The cogging torque is expressed in terms of scalar potential computed by the virtual work formula. The minimization of cogging torque is achieved by using the ( ${\mu}$ + ${\lambda}$ ) Evolution Strategy (ES) and the selected flux densities are used to a constraint.