Electromagnetic levitation of a conducting cylinder

Piggott, L.S.; Nix, G.F.

doi:10.1049/piee.1966.0204

Cited by 10 publications

(2 citation statements)

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“…One early study into radial EDBs for rotating objects was performed by Piggott and Nix. 13 In their study, the static stability and power dissipation of the magnetic suspension were investigated using analytical models and experimental tests. The magnetic suspension consisted of a rotating conducting cylinder put in levitation by an alternating magnetic field.…”

Section: Ac Supplied Edbsmentioning

confidence: 99%

Progress on electrodynamic passive magnetic bearings for rotor levitation

Detoni

2013

Proceedings of the Institution of Mechanical Engineers, Part C:

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Electrodynamic suspension exploits repulsive forces due to eddy currents to produce positive stiffness by passive means, without violating the Earnshaw stability criterion. Systems employing this principle to levitate a rotor radial and/or axial degrees of freedom are called electrodynamic bearings (EDBs). Since the eddy currents can be induced either by using alternating current supplied electromagnets or by the relative motion between a conductor and a constant magnetic field, the research on EDBs has developed many different configurations. The present paper reviews the literature on electrodynamic passive magnetic bearings to analyze the evolution of this technology toward completely passive, stable, rotor levitation, and to compare the EDBs performance with other common magnetic bearing technologies. Radial and axial EDB technologies are reviewed attempting to create an organized connection between the works and to discuss some critical issues that still preclude the use of EDBs in industrial applications.

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Section: Ac Supplied Edbsmentioning

confidence: 99%

Progress on electrodynamic passive magnetic bearings for rotor levitation

Detoni

2013

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…Thus, Heaviside early treated thoroughly the thick coaxial cable [1]. More recently, paraxial problems in which homogeneous cylindric shells of various thicknesses are subject to inducing fields rotationally symmetric about axes parallel to the shell axis have been treated similarly for a variety of configurations [2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic induction in finite-length cylinders: an exact solution

Bird¹

1987

IEE Proc. A Phys. Sci. Meas. Instrum. Manage. Educ. Rev. UK

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The calculation of electromagnetic fields and currents induced in circularly cylindric metallic shells by low-frequency external fields is discussed, with focus on the effects of finite cylinder length. For an inducing field possessing rotational symmetry about an axis parallel to the shell axis, we have developed approximate analytic solutions. Further, for the degenerate case of coincident axes, we obtain an exact analytic solution. Already this coaxial solution makes manifest the complexity introduced by finite length, and yet allows one to discern the behaviour of induced field and current with varying length. We outline here the basic field-theoretic formulation and a strategy for solving the finite cylinder problem for any inducing field, which yielded the approximate paraxial solutions cited. We then present a detailed derivation of our exact coaxial solution from the basic formulation. General properties of the exact analytic solution are discussed, including its practicability, eddy-current system and cylinder-length dependence, and contrasted with recent inadequate analytical treatments for both coaxial and paraxial cases.

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Near Equilibrium States

Moreau

1990

Fluid Mechanics and Its Applications

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Electromagnetic levitation of a conducting cylinder

Cited by 10 publications

References 0 publications

Progress on electrodynamic passive magnetic bearings for rotor levitation

Progress on electrodynamic passive magnetic bearings for rotor levitation

Electromagnetic induction in finite-length cylinders: an exact solution

Near Equilibrium States

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