RECENT DEVELOPMENT IN GRAIN-ORIENTED ELECTRICAL STEEL WITH LOW MAGNETOSTRICTION

For precise evaluations of magnetostriction properties, a new magnetos triction measuring system using a laser vibrometer was developed, Freq uency analysis of magnetostriction under non-sinusoidal magnetization revealed a nonlinear relation between harmonics in flux and those in m agnetostriction. Transformer core vibration was investigated in order to clarify the relations between magnetostriction and transformer nois e and to realize low-noise transformers, Resonance was proved to have an important role for core vibration, Domain-refined, grain-oriented e lectrical steel, which fulfills low loss and low magnetostriction prop erties simultaneously, is also explained.