For precise evaluations of magnetostriction properties, a new magnetostriction measuring system using a laser vibrometer was developed. Frequency analysis of magnetostriction under non-sinusoidal magnetization revealed a nonlinear relation between harmonics in flux and those in magnetostriction. Transformer core vibration was investigated in order to clarify the relations between magnetostriction and transformer noise and to realize low-noise transformers. Resonance was proved to have an important role for core vibration. Domain-refined, grain-oriented electrical steel, which fulfills low loss and low magnetostriction properties simultaneously, is also explained.
The effect of cold rolling condition on magnetic properties of non-oriented electrical steel was investigated. For evaluation of cold rolling condition, utilizing rolling shape factor (RSI0 was proposed. In the case of small RSF, magnetic induction was improved. Development of ND II <111> components was suppressed in the recrystallized texture near the surface, and the vicinity of the I100]<001> component was developed after grain growth. The relation between RSF and cold-rolling condition was examined by computer simulation; such results were attributed to the increment of shear strain in the surface texture. Magnetic properties would be improved by adequate control of cold-rolling condition.
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