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Multiscale Finite Element Analysis of Linear Magnetic Actuators Using Asymptotic Homogenization Method

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Abstract

This work presents the multiscale finite element analysis of linear magnetic actuators. Here, the actuators includes unidirectional fiber reinforced magnetic composites as a back-iron core component. The composite is employed in actuators to enhance the magnetic force. However, the direct computation of actuators including heterogeneous composite structures requires high computation cost. To overcome this problem, multiscale computational technique for the analysis of a magnetic actuator is proposed in this work. First, the effective magnetic permeability of the composite is calculated at various fiber volume fractions and orientation angles. For this, the asymptotic homogenization method is applied to the composite unit cell model in microscopic coordinate system. Next, the obtained homogenized effective permeability is utilized for the macroscopic magnetostatic analysis of actuator model. Subsequently, the magnetic force acting on a actuator plunger is calculated using the Maxwell stress tensor method. To validate the accuracy and computational benefit of the proposed multiscale approach, a actuator numerical example is provided. For the accuracy validation, the magnetic force and magnetic field distribution obtained from the proposed multiscale approach are compared with those from the direct calculation. In addition, the computation time consumed for the mutiscale approach and direct calculation is compared to validate the benefit of the proposed analysis process.

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Acknowledgements

This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (NRF-2016 R1D1A1B03931138), and Global University Project (GUP) grant funded by the GIST in 2018.

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  1. School of Mechanical Engineering, Gwangju Institute of Science and Technology (GIST), Gwangju, 61005, South Korea

    Jaewook Lee

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  1. Jaewook Lee
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Correspondence to Jaewook Lee.

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Lee, J. Multiscale Finite Element Analysis of Linear Magnetic Actuators Using Asymptotic Homogenization Method. Multiscale Sci. Eng. 1, 70–75 (2019). https://doi.org/10.1007/s42493-018-00013-x

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  • DOI: https://doi.org/10.1007/s42493-018-00013-x

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