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A New Approach to Calculate the Shielding Factor of Magnetic Shields Comprising Nonlinear Ferromagnetic Materials under Arbitrary Disturbances

by 1, 1,2,*, 1,2, 1, 1,2 and 1,2,*
1
Department of Electrical Engineering, Harbin Institute of Technology, Harbin 150001, China
2
Laboratory for Space Environment and Physical Sciences, Harbin Institute of Technology, Harbin 150001, China
*
Authors to whom correspondence should be addressed.
Energies 2019, 12(11), 2048; https://doi.org/10.3390/en12112048
Received: 8 April 2019 / Revised: 20 May 2019 / Accepted: 24 May 2019 / Published: 29 May 2019
To enable the realization of ultra-low magnetic fields for scientific and technological research, magnetic shielding is required to create a space with low residual magnetic field and high shielding factors. The shielding factors of magnetic shields are due to nonlinear material properties, the geometry and structure of the shields, and the external magnetic fields. Magnetic shielding is used in environments full of random realistic disturbances, resulting in an arbitrary and random external magnetic field, and in this case, the shielding effect is hard to define simply by the shielding factors. A new method to simulate and predict a dynamic internal space magnetic field wave is proposed based on the Finite Element method (FEM) combined with the Jiles-Atherton (JA) model. By simulating the hysteresis behavior of the magnetic shields and establishing a dynamic model, the new method can simulate dynamic magnetic field changes inside magnetic shields as long as the external disturbances are known. The shielding factors under an AC external field with a sine wave and certain frequencies are calculated to validate the feasibility of the new method. A real-time wave of internal magnetic flux density under an AC triangular wave external field is simulated directly with the new method versus a method that splits the triangular wave into several sine waves by a Fourier transform, divides the shielding factors, and then adds the quotients together. Moreover, real-time internal waves under some arbitrary fields are measured. Experimental internal magnetic flux density waves of a 4-layer magnetically shielded room (MSR) at the Harbin Institute of Technology (HIT) fit the simulated results well, taking experimental errors into account. View Full-Text
Keywords: magnetic shields; shielding factor; Jiles-Atherton model; nonlinear ferromagnetic materials; environmental disturbances magnetic shields; shielding factor; Jiles-Atherton model; nonlinear ferromagnetic materials; environmental disturbances
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MDPI and ACS Style

Zhao, Y.; Sun, Z.; Pan, D.; Lin, S.; Jin, Y.; Li, L. A New Approach to Calculate the Shielding Factor of Magnetic Shields Comprising Nonlinear Ferromagnetic Materials under Arbitrary Disturbances. Energies 2019, 12, 2048. https://doi.org/10.3390/en12112048

AMA Style

Zhao Y, Sun Z, Pan D, Lin S, Jin Y, Li L. A New Approach to Calculate the Shielding Factor of Magnetic Shields Comprising Nonlinear Ferromagnetic Materials under Arbitrary Disturbances. Energies. 2019; 12(11):2048. https://doi.org/10.3390/en12112048

Chicago/Turabian Style

Zhao, Yiyang, Zhiyin Sun, Donghua Pan, Shengxin Lin, Yinxi Jin, and Liyi Li. 2019. "A New Approach to Calculate the Shielding Factor of Magnetic Shields Comprising Nonlinear Ferromagnetic Materials under Arbitrary Disturbances" Energies 12, no. 11: 2048. https://doi.org/10.3390/en12112048

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