VP17-09 Measurement and Analysis of Magnetostriction of Nanocrystalline Alloy Laminations under Medium-frequency Excitation
Creators: Changgeng Zhang
Haitao Zhang
Tao Chen
Yongjian Li
Publisher: name: IEEE
Year: 2025

The medium-frequency transformer is a vital component of high-voltage and large-capacity DC/DC converters, in which the vibration and acoustic noise of the transformer will be intensified at high frequencies and high-power densities. Nanocrystalline alloys, widely used as core materials of medium-frequency transformers, require accurate measurement of their magnetostrictive properties to calculate core vibration and noise during the transformer design phase[1]. Currently, the magnetostriction of soft magnetic material sheets is typically measured using laser methods, which require the sheets to maintain a fixed shape and be easy to handle[2]. However, due to the softness, brittleness, and small magnetostriction coefficient of the annealed nanocrystalline alloy sheets, measuring their magnetostriction requires bonding the sheets and utilizing high-precision laser sensors[3]. In this paper, a measuring system consisting of NI PXIe-6368 DAQ, two magnetic yokes, a laser vibrometer with an optical reflector, and a PC is constructed to measure the in-plane magnetostriction of nanocrystalline alloy laminations under alternating magnetic field within medium-frequency excitation. The magnetic properties and magnetostriction of nanocrystalline alloy laminations are measured and the variations with magnetic flux density and magnetization frequency are investigated. The results indicate that the magnetostriction of nanocrystalline alloy laminations gradually increases with the rise in magnetic flux density, with a more pronounced increase in the saturation region, which aligns with the vibration patterns of nanocrystalline cores. At different magnetization frequencies, the results indicate distinct elongation or contraction characteristics. An elongation appears and the amplitude of magnetostriction increases with the increase of frequency within 5 kHz. A contraction characteristic is evident and the amplitude of magnetostriction decreases as the frequency increases at higher frequencies.References: [1]Chen B, Wan N, Wang, S, COMPEL-The international journal for computation and mathematics in electrical and electronic engineering., Vol. 42(3), p.718-739(2023) [2]Siebert S, Kajiwara C, Fujiwara K, Journal of Magnetism and Magnetic Materials., Vol. 565, p.170295(2023) [3]LI Y, ZHU J, LI Y, Journal of Magnetism and Magnetic Materials., Vol. 529, p.167854(2021)
The medium-frequency transformer is a vital component of high-voltage and large-capacity DC/DC converters, in which the vibration and acoustic noise of the transformer will be intensified at high frequencies and high-power densities. Nanocrystalline alloys, widely used as core materials of medium-frequency transformers, require accurate measurement of their magnetostrictive properties to calculate core vibration and noise during the transformer design phase[1]. Currently, the magnetostriction of soft magnetic material sheets is typically measured using laser methods, which require the sheets to maintain a fixed shape and be easy to handle[2]. However, due to the softness, brittleness, and small magnetostriction coefficient of the annealed nanocrystalline alloy sheets, measuring their magnetostriction requires bonding the sheets and utilizing high-precision laser sensors[3]. In this paper, a measuring system consisting of NI PXIe-6368 DAQ, two magnetic yokes, a laser vibrometer with an optical reflector, and a PC is constructed to measure the in-plane magnetostriction of nanocrystalline alloy laminations under alternating magnetic field within medium-frequency excitation. The magnetic properties and magnetostriction of nanocrystalline alloy laminations are measured and the variations with magnetic flux density and magnetization frequency are investigated. The results indicate that the magnetostriction of nanocrystalline alloy laminations gradually increases with the rise in magnetic flux density, with a more pronounced increase in the saturation region, which aligns with the vibration patterns of nanocrystalline cores. At different magnetization frequencies, the results indicate distinct elongation or contraction characteristics. An elongation appears and the amplitude of magnetostriction increases with the increase of frequency within 5 kHz. A contraction characteristic is evident and the amplitude of magnetostriction decreases as the frequency increases at higher frequencies.References: [1]Chen B, Wan N, Wang, S, COMPEL-The international journal for computation and mathematics in electrical and electronic engineering., Vol. 42(3), p.718-739(2023) [2]Siebert S, Kajiwara C, Fujiwara K, Journal of Magnetism and Magnetic Materials., Vol. 565, p.170295(2023) [3]LI Y, ZHU J, LI Y, Journal of Magnetism and Magnetic Materials., Vol. 529, p.167854(2021)