Self-sensing magnetic levitation using a LC resonant circuit |
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| Affiliation: | 1. Proton Beam Therapy Center, Hokkaido University Hospital, North14 West5, Kita-ku, Sapporo, Hokkaido 060-8638, Japan;2. Department of Medical Physics, Graduate School of Medicine, Hokkaido University, North15 West7, Kita-ku, Sapporo, Hokkaido 060-8638, Japan;3. Global Station of Quantum Medical Science and Engineering, Global Institution for Collaborative Research and Education, Hokkaido University, North15 West7, Kita-ku, Sapporo, Hokkaido 060-8638, Japan;4. Division of Quantum Science and Engineering, Faculty of Engineering, Hokkaido University, North13 West8, Kita-ku, Sapporo, Hokkaido 060-8638, Japan;5. Hitachi Ltd., 1-1 7-chome, Oomika-cho, Hitachi-shi, Ibaraki 319-1292, Japan;1. School of Engineering and Materials Science, Queen Mary University of London, London, UK;2. Parks College of Engineering, Aviation and Technology, Saint Louis University, St. Louis, MO, 63103 USA;3. Tianjin Jinhang Computing Technology Research Institute, Tianjin 300308, China;1. Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology, Wuhan 430074, People׳s Republic of China;2. School of Physics, Huazhong University of Science and Technology, Wuhan 430074, People׳s Republic of China |
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| Abstract: | A self-sensing magnetic levitation system utilizing a LC resonant circuit is proposed by using the characteristic that the inductance of the magnetic system is varied with respect to the air gap displacement. An external capacitor is added into the electric system to make the levitation system statically stable, which much relieves the control effort required to stabilize the magnetic levitation system of having an intrinsic unstable nature. For the realization of the self-sensing magnetically levitated system, an amplitude modulation/demodulation method is used with a positive position feedback controller. Experimental results are presented to validate the proposed method. |
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