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Design of Magnetic Force Field for Trajectory Control of Levitated Diamagnetic Graphite

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Abstract

A diamagnetic material can be levitated in a strong magnetic field using a repulsive force due to its negative magnetic susceptibility. The magnitude of the repulsive force is proportional to the magnetic force field and the magnetic susceptibility of the material. Using this simple concept, a novel method is developed for trajectory control of the levitated diamagnetic material without a power source. In this study, pyrolytic graphite (PG) is adopted as the levitated material due to its strong diamagnetic response. Various motions of a PG disk, such as linear, curved, and pendulum motions, are realized with unique permanent magnet arrays. These movements are successfully achieved through manipulating the magnetic force field variation, which is verified with simulation results. Furthermore, a photo-gated motion is accomplished through utilizing photo-thermal energy that is transferred with a laser beam. This study demonstrates the possibility of developing frictionless transport systems.

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Abbreviations

χ :

Magnetic susceptibility of the material

m :

Mass of the levitating object

V :

Volume of the levitating object

B :

Magnetic field intensity

μ0 :

Permeability of free space

g :

Gravitational acceleration

z :

Levitation height

BdB/dz :

Magnetic force field

ρ :

Density of levitating object

M :

Magnetization of permanent magnet

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Authors and Affiliations

  1. Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291, Daehak-ro, Yuseong-go, Daejeon, 34141, Republic of Korea

    Sumin Kang, Jihoon Kim, Jae-Bum Pyo, Jae Hyung Cho & Taek-Soo Kim

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  1. Sumin Kang
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  2. Jihoon Kim
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  3. Jae-Bum Pyo
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  4. Jae Hyung Cho
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  5. Taek-Soo Kim
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Correspondence to Taek-Soo Kim.

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Kang, S., Kim, J., Pyo, JB. et al. Design of Magnetic Force Field for Trajectory Control of Levitated Diamagnetic Graphite. Int. J. of Precis. Eng. and Manuf.-Green Tech. 5, 341–347 (2018). https://doi.org/10.1007/s40684-018-0036-3

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  • DOI: https://doi.org/10.1007/s40684-018-0036-3

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