An optimal design method using the finite element method and the evolution
strategy (ES) is investigated. The evolution strategy is applied to the opt
imization of induction heating model. The position of auxiliary coil, frequ
ency and ampere-turns are optimized so that the distribution of eddy curren
t density on the surface of steel becomes uniform. It is shown that the sel
ection of the appropriate parameter is important in the practical applicati
on of ES.