Abstract
As an intrinsic property, elasticity of soft material is affected significantly by the externally applied alternating magnetic field. Magnetostrictive properties of the grain-oriented (GO) silicon steel under DC-biased and multisinusoidal magnetizations are measured by using a laser-based measuring system. Magnetostriction curves of the GO silicon steel sheet under different magnetizations are obtained and the influence of frequency and DC bias on the magnetostrictive property is observed and analyzed based on the measured data. In addition, the spectrum of magnetostriction under harmonic magnetization is obtained, and the acoustic noise level of the GO silicon steel sheet represented by the A-weighted decibel value caused by magnetostriction is measured under DC-biased and multisinusoidal magnetizations. The measurement results are applied to the simulation of the three-limb laminated core model, and the effects of DC bias and harmonics on magnetic flux density and displacement are analyzed.
Highlights
Magnetostrictive properties of electrical steel sheet under complicated excitations, such as harmonic excitation, DC-biased excitation, and even other extreme excitations, are of great importance for the analysis and design of large electromagnetic devices, especially for ultra-high voltage (UHV)power transformers and converters, and their performance highly affect the safe, economic, and reliable operation of a power system [1,2,3,4]
The AC and DC excitations are applied simultaneously to make the GO silicon steel sheet magnetized under the DC bias condition
The magnetostriction loops measured along the rolling direction are no longer symmetric under DC-biased magnetization; the DC-biased or harmonic magnetic fields gives rise to the increase of the peak value of magnetostriction
Summary
Magnetostrictive properties of electrical steel sheet under complicated excitations, such as harmonic excitation, DC-biased excitation, and even other extreme excitations, are of great importance for the analysis and design of large electromagnetic devices, especially for ultra-high voltage (UHV)power transformers and converters, and their performance highly affect the safe, economic, and reliable operation of a power system [1,2,3,4]. Magnetostrictive properties of electrical steel sheet under complicated excitations, such as harmonic excitation, DC-biased excitation, and even other extreme excitations, are of great importance for the analysis and design of large electromagnetic devices, especially for ultra-high voltage (UHV). Owing to the demand for a high-capacity, long-distance, and high-voltage level power transmission, the ultra-high voltage direct current (UHVDC) transmission project has been in operation in China. The existence of DC bias phenomenon in the UHVDC usually causes significant saturation in transformer cores, and gives rise to more violent vibration and heavier noise due to the magnetostrictive properties of silicon sheet steel [8,9,10]. The GO silicon steel is mainly used for manufacturing the laminated core of large power transformers [15,16]. Vibration of the Materials 2019, 12, 2156; doi:10.3390/ma12132156 www.mdpi.com/journal/materials
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