Vibration suppression for high temperature superconducting levitation flywheel system using coil dampers

Issue title: Proceedings of the twelfth International Symposium on Interdisciplinary Electromagnetic, Mechanic and Biomedical Problems, ISEM Bad Gastein

Article type: Research Article

Authors: Nagaya, Kosuke^{a; *} | Saito, Masato^a | Kobayashi, Kazuya^a | Murakami, Iwanori^a

Affiliations: [a] Department of Mechanical Engineering, Gunma University, Kiryu, Gunma 376-8515, Japan

Correspondence: [*] Corresponding author. Tel.: +81 277 30 1563; Fax: +81 277 30 1563; E-mail: [email protected]

Abstract: A simple and stable flywheel system with high temperature superconducting levitation is presented that needs no control for levitation. The drive system consists of eight-poles cylindrical permanent magnet and eight cylindrical coils, in which magnetic forces in the direction perpendicular to the shaft axis are cancelled. Hence, vibration force due to the driving is zero in this system. A coil-type electromagnetic damper is also presented which works in the magnetic field of levitation permanent magnet. The dampers lie at both ends of the shaft. Using this system, a control like the sensorless control can be performed by using coils only. The control method has been presented and analytical expressions are also obtained for vibrations of the shaft. To validate the analysis, experimental tests have been carried out.

Keywords: Superconductor, levitation, flywheel, vibration control, damper, motor

DOI: 10.3233/JAE-2007-896

Journal: International Journal of Applied Electromagnetics and Mechanics, vol. 25, no. 1-4, pp. 559-564, 2007