Study of estimation of iron loss under both dc-biased magnetization and compressive stress for design of energy saving devices

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The measurement system was developed used for the measurement of the semi-static hysteresis loop (excitation frequency : 5mHz)of an electrical steel sheet under both dc-biased magnetization and compressive stress. The effect of the compressive stress on the hysteresis loss of minor loop which generated on the initial magnetization curve is examined. Irrespective of the largeness of compressive stress, the hysteresis loss of a minor loop of the non-oriented electrical steel sheet reaches the maximum when the DC biased magnetization of 1. 5T is applied. When the compressive stress of 5MPa is impressed, the increasing rate of the hysteresis loss of a minor loop decreases. Under the dc-biased magnetization above 1. 5T, when the compressive stress increases, the hysteresis loss of a minor loop hardly increases.