Establishing an optimal annealing process of magnetic cores by the Taguchi method

This paper describes the use of statistical methods as advocated by Taguchi to optimize the annealing process of magnetic cores of wound core type transformers. By using orthogonal experimental design and analysis techniques, these methods allow an industrial process to be optimized with only a small number of experiments. Assessment of these experiments differs from conventional methods in that it is of first importance to minimize the variation in response. This then gives a process, which is insensitive to the effects of uncontrollable factors. Results from the application of the optimal conditions in the annealing process of magnetic cores demonstrate the feasibility of this method since it helps reducing core losses as well as the divergence of actual core losses from the theoretical ones