Magnetic Suspension using Soft Magnetic Materials and High Tc Superconductor

Tsutsui, Yukio; Kondou, Nobuhiro; Higuchi, Toshiro

doi:10.1007/978-4-431-66871-8_298

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“…The magnetic force shows a hysteresis in the approaching and retreating processes. It might be explained that some fluxes pinned in the HTS are released from the pinning center resulting in being trapped in other pinning center [2], [7].…”

Section: Static Measurementmentioning

confidence: 98%

“…Here, indicates the displacement from the equilibrium point of the oscillation system. Therefore, the stiffness and damping constants can be calculated by modulating measured oscillation by (2). A schematic of experimental setup in the damped oscillation analysis is shown in Fig.…”

Section: A Damped Oscillation Analysismentioning

confidence: 99%

“…To solve this problem, alternative levitation systems which use soft magnetic materials instead of permanent magnets have been proposed [1]- [3]. Especially, Tsutsui and Higuchi have proposed a magnetic gradient levitation system, which possesses a practical attractive force [2]. The authors have improved the levitation performance focusing on only the static behavior [4], [5].…”

Section: Introductionmentioning

confidence: 99%

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Dynamic Properties of Magnetic Levitation System Using High-Temperature Superconductors

Sakai

Higuchi

2011

IEEE Trans. Appl. Supercond.

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Pinning effect of a bulk high-temperature superconductor (HTS) has various possible applications, e.g., it enables a non-contact and stable levitation without active control. Regarding the magnetic levitation with HTSs, permanent magnets are generally employed, but our previous studies have demonstrated that the permanent magnets can be replaced with soft magnetic materials such as iron. When the magnetic levitation is applied to large transportation system, the use of this technique has a potential to allow a low-cost levitation system with a simple structure, in which expensive permanent magnets can be eliminated. In the mechanical design, a dynamic evaluation as well as a static evaluation must be needed. Hence, this paper fundamentally discusses dynamic properties of the magnetic levitation modulated by a damped harmonic oscillator model. For the dynamic analysis, this paper proposes a novel measurement method using repetitive control. The analysis shows that the dynamic properties of our system are related to the approach manner-process and speed-of the soft magnetic material to the HTS. It is expected that these results may shed further light on the design of efficient levitation system with HTSs.Index Terms-Dynamic properties, maglev, pinning effect, soft magnetic material.

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Section: Static Measurementmentioning

confidence: 98%

Section: A Damped Oscillation Analysismentioning

confidence: 99%