Numerical modeling of iron yoke levitation using the pinning effect of high-temperature superconductors

Mojtaba Ghodsi; Toshiyuki Ueno; Hidekazu Teshima; Hosei Hirano; Toshiro Higuchi

doi:10.1109/TMAG.2006.890218

Numerical modeling of iron yoke levitation using the pinning effect of high-temperature superconductors

Mojtaba Ghodsi^*, Toshiyuki Ueno, Hidekazu Teshima, Hosei Hirano, Toshiro Higuchi

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

14 Citations (Scopus)

Abstract

A ferromagnetic material can be levitated by the pinning effect of a field-cooled superconductor. This paper presents two methods for modeling this effect: 1) an approximate calculation to determine the relationship between attractive force and air gap at both room temperature and superconductive temperature (77 K) and 2) a novel way of modeling the pinning effect by a finite-element method (FEM). A comparison of analytical and FEM results with experimental results verifies the validity of the methods. The methods can be used to estimate the system's behavior when the cylindrical yoke is replaced by a ring yoke. The stiffness of the system will increase by 70% (to 5.3 N/mm) when a ring yoke with the same surface area is used instead of a cylindrical yoke.

Original language	English
Pages (from-to)	2001-2008
Number of pages	8
Journal	IEEE Transactions on Magnetics
Volume	43
Issue number	5
DOIs	https://doi.org/10.1109/TMAG.2006.890218
Publication status	Published - May 2007
Externally published	Yes

Keywords

Analytical model
Field-cooled high temperature superconductor
Finite-element method (FEM)
Maxwell theory
Numerical modeling
Pinning effect
Shape effect

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Electrical and Electronic Engineering

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10.1109/TMAG.2006.890218

Cite this

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title = "Numerical modeling of iron yoke levitation using the pinning effect of high-temperature superconductors",

abstract = "A ferromagnetic material can be levitated by the pinning effect of a field-cooled superconductor. This paper presents two methods for modeling this effect: 1) an approximate calculation to determine the relationship between attractive force and air gap at both room temperature and superconductive temperature (77 K) and 2) a novel way of modeling the pinning effect by a finite-element method (FEM). A comparison of analytical and FEM results with experimental results verifies the validity of the methods. The methods can be used to estimate the system's behavior when the cylindrical yoke is replaced by a ring yoke. The stiffness of the system will increase by 70% (to 5.3 N/mm) when a ring yoke with the same surface area is used instead of a cylindrical yoke.",

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author = "Mojtaba Ghodsi and Toshiyuki Ueno and Hidekazu Teshima and Hosei Hirano and Toshiro Higuchi",

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AU - Teshima, Hidekazu

AU - Hirano, Hosei

AU - Higuchi, Toshiro

PY - 2007/5

Y1 - 2007/5

N2 - A ferromagnetic material can be levitated by the pinning effect of a field-cooled superconductor. This paper presents two methods for modeling this effect: 1) an approximate calculation to determine the relationship between attractive force and air gap at both room temperature and superconductive temperature (77 K) and 2) a novel way of modeling the pinning effect by a finite-element method (FEM). A comparison of analytical and FEM results with experimental results verifies the validity of the methods. The methods can be used to estimate the system's behavior when the cylindrical yoke is replaced by a ring yoke. The stiffness of the system will increase by 70% (to 5.3 N/mm) when a ring yoke with the same surface area is used instead of a cylindrical yoke.

AB - A ferromagnetic material can be levitated by the pinning effect of a field-cooled superconductor. This paper presents two methods for modeling this effect: 1) an approximate calculation to determine the relationship between attractive force and air gap at both room temperature and superconductive temperature (77 K) and 2) a novel way of modeling the pinning effect by a finite-element method (FEM). A comparison of analytical and FEM results with experimental results verifies the validity of the methods. The methods can be used to estimate the system's behavior when the cylindrical yoke is replaced by a ring yoke. The stiffness of the system will increase by 70% (to 5.3 N/mm) when a ring yoke with the same surface area is used instead of a cylindrical yoke.

KW - Analytical model

KW - Field-cooled high temperature superconductor

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KW - Pinning effect

KW - Shape effect

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Numerical modeling of iron yoke levitation using the pinning effect of high-temperature superconductors

Abstract

Keywords

ASJC Scopus subject areas

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