Publication: Measurement of ac and dc magnetic characterization of electrical steels
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Date
2010-04-01
Authors
Ooi, Ying Kea
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Abstract
This project basically is to measure the AC and DC magnetic characteristics of electrical steels used in electrical machines. The measurement of the BH curve and iron loss characteristics of electrical steels is implemented based on tests on cores done at several different primary current levels and supply’s frequencies. For measurement of AC magnetic characterization, Wien-bridge oscillator and push-pull amplifier are used as the AC supply with variable frequency and magnitude. An integrator circuit is designed to measure the B-H characteristics of electrical steels and the output of measurement is shown on oscilloscope. The B-H loop of electrical steel represents the relationship between its magnetic flux density, B as a function of the magnetic field intensity, H. The hysteresis loop is plotted and the relationship between magnetic flux density, B and magnetic field intensity, H is discussed. The corresponding relative permeability, μr is obtained.