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http://dx.doi.org/10.5762/KAIS.2017.18.11.794

Transfer System using Radial Electrodynamic Wheel over Conductive Track  

Jung, Kwang Suk (Department of Mechanical Engineering, Korea National University of Transportation)
Publication Information
Journal of the Korea Academia-Industrial cooperation Society / v.18, no.11, 2017 , pp. 794-801 More about this Journal
Abstract
When a radial wheel is placed so as to partially overlap a conductive plate and rotated, a lift force is generated on the wheel, a thrust force along the edge, and a lateral force which tends to reduce the overlap region. When several of these wheels are combined, it is possible to realize a system in which the stability of the remaining axes is ensured, except in the traveling direction. To validate the overall characteristics of the multi-wheel system, we propose a transfer system levitated magnetically using radial electrodynamic wheels. The proposed system is floated and propelled by four wheels and arranged in a structure that allows the thrusts generated by the front and rear wheels to offset each other. The dynamic stability of the wheel and the effect of the pole number on the three-axial forces are analyzed by the finite element method. At this time, the thrust and levitation force are strongly coupled, and the only factor affecting them is the wheel rotation speed. Therefore, in order to control these two forces independently, we make use of the fact that the ratio of the thrust to the levitation force is proportional to the velocity and is independent of the size of the gap. The in-plane and out-of-plane motion control of the system is achieved by this control method and compared with the simulation results. The experimental results show that the coupled degrees of freedom can be effectively controlled by the wheel speed alone.
Keywords
Dynamic stability; Electrodynamic wheel; Finite element analysis; Independent control; Magnetic levitation; Parameter sensitivity analysis;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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1 N. Fujii, T. Ogawa, T. Matsumoto, "Revolving magnet wheels with permanent magnets", Electrical Engineering(in Japan), vol. 116, pp. 106-118, 1996. DOI: https://doi.org/10.1002/eej.4391160110   DOI
2 N. Fujii, Y. Ito, T. Yoshihara, "Characteristics of a moving magnet rotator over a conducting plate", IEEE Transactions on Magnetics, vol. 41, no. 10, pp. 3811-3813, 2005. DOI: https://doi.org/10.1109/TMAG.2005.854930   DOI
3 K. S. Jung, K. B. Shim, "Noncontact conveyance of conductive plate using omni-directional magnet wheel", Mechatronics, vol. 20, pp. 496-502, 2010. DOI: https://doi.org/10.1016/j.mechatronics.2010.04.007   DOI
4 J. H. Park, Y. S. Baek, "Parametric design of the levitation mechanism for maglev planar transportation vehicle", IEEE Transactions on Magnetics, vol. 40, pp. 3069-3072, 2004. DOI: https://doi.org/10.1109/TMAG.2004.829262   DOI
5 K. S. Jung, "A novel method transferring the copper rod without contact by axial magnet wheels", International Journal of Applied Electromagnetics and Mechanics, vol. 47, pp. 187-197, 2015. DOI: https://doi.org/10.3233/JAE-140026   DOI
6 K. S. Jung, "Contactless conveyance of conductive rod by rotating the radial electrodynamic wheel with a spiral structure", International Journal of Applied Electromagnetics and Mechanics, vol. 46, pp. 569-582, 2014. DOI: https://doi.org/10.3233/JAE-141956   DOI
7 J. Bird, T. A. Lipo, "Characteristics of an electrodynamic wheel using a 2-D steady-state model", IEEE Transactions on magnetics, vol. 43, no. 8, pp. 3395-3405, 2007. DOI: https://doi.org/10.1109/TMAG.2007.900572   DOI
8 J. Bird, T. A. Lipo, "Calculating the forces created by an electrodynamic wheel using a 2-D steady-state finite-element method", IEEE Transactions on magnetics, vol. 44, no. 3, pp. 365-372, 2008. DOI: https://doi.org/10.1109/TMAG.2007.913038   DOI
9 K. S. Jung, "Parametric design of contact-free transportation system using the repulsive electrodynamic wheels", J. of the Korea Academia- Industrial cooperation Society, vol. 17, no. 3, pp. 310-316, 2016. DOI: https://doi.org/10.5762/KAIS.2016.17.3.310   DOI