Abstract
Accurate prediction of core losses has been a crucial aspect in the field of electromagnetics for several decades. Extensive experimental results have shown that the core loss under harmonic excitation is more complicated than that under sinusoidal excitations, which means that the traditional core loss calculation methods are no longer applicable under distorted flux. In order to determine an efficient numerical approach when minor hysteresis loops occur, a harmonic magnetic test platform is used to study the effect of the variation of B–H properties on the iron loss and magnetic flux density of grain oriented silicon steel lamination under different supply voltages. A simple method, which could be used to predict the iron losses in thin laminations due to a number of non-sinusoidal waveforms with or without minor loops, for estimating the iron loss based on the loss separation method is proposed. The errors are substantially lower than those of conventional models while saving time.
Highlights
Magnetic property simulations and loss calculations of ferromagnetic materials under harmonic excitation are very important
From the point of the physical mechanism of the hysteresis, the local periodic fluctuation of the magnetic field produces a local irreversible magnetization, which causes the occurrence of minor loops and an increase in the core loss
A harmonic magnetic test platform is used to study the effect of the harmonic amplitude, order, and phase on the iron loss and magnetic flux density of grain oriented (GO) silicon steel lamination under different supply voltages
Summary
Magnetic property simulations and loss calculations of ferromagnetic materials under harmonic excitation are very important. The modified Steinmetz equation (MSE) is developed to estimate loss with non-sinusoidal waveforms.. The modified Steinmetz equation (MSE) is developed to estimate loss with non-sinusoidal waveforms.5 It uses a combination of the effective frequency and the repetition rate frequency and requires no material characterization beyond the coefficients in the Steinmetz equation. Most loss models are modified by pure numerical fitting methods, so they require extensive measurement and parameter extraction for a given material.. Most loss models are modified by pure numerical fitting methods, so they require extensive measurement and parameter extraction for a given material.6,7 Those models may cause inaccurate prediction of the core loss because of failure to consider loss separation in the right perspective and the lack of theoretical support. The proposed loss model has been set up on a large number of experiments under different supply voltages with and without minor loops so that the reported results can be directly applied by the electrical designers
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