Abstract
This chapter explores that noise generated by transformers has become important from an environmental point of view. The magnetostriction in grain oriented silicon steel is recognized as a main cause of the noise. As extensive data show, the magnetostriction is remarkably influenced by various stress conditions through manufacturing and application process of the steel not only until a construction of transformer but all time during its operation. The reason why the magnetostriction is remarkably influenced by stress condition, such as the deterioration by compressive stress, has been elucidated by many researchers recently. Even with these studies, however, it was not always easy to estimate the influence of superimposed stresses on the magnetostriction. This chapter aims to derive a predictive equation of stress influence on the occurrence of the magnetostriction in grain oriented silicon steel by both hypothetical theory and elaborate experimental procedure, and introduce an application method of the equation with an exemplified procedure even upon practical superimposed stress condition.
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