Passive Magnetic Levitation of Rotors on Axial Electrodynamic Bearings

Impinna, Fabrizio; Detoni, Joaquim Girardello; Amati, Nicola; Tonoli, Andrea

doi:10.1109/tmag.2012.2209124

Cited by 26 publications

(16 citation statements)

References 18 publications

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“…Modelling of electrodynamic bearing based on computation of electromagnetic force is presented and compared with experimental results [1]. Computation of magnetic field, eddy current and developed forces of an electrodynamic levitation device by finite volume method modelling caused reduction of storage memory and computation time [2].…”

Section: Introductionmentioning

confidence: 99%

Modelling and Analysis of Permanent Magnet Electrodynamic Suspension Systems

Rezaei¹,

Vaez‐Zadeh²

2014

PIER M

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Abstract-In this paper, an analytical model of permanent magnet electrodynamic suspension systems (PEDSs) is proposed. Horizontal and vertical magnetic fields of a permanent magnet (PM) are effectively approximated by sinusoidal functions. By this means, closed form solutions are obtained for lift and drag forces of PEDSs for the first time. The suspension system is then modelled by finite element method (FEM). The accuracy of the analytical model is validated by FEM and experimental measurements.

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Section: Introductionmentioning

confidence: 99%

Modelling and Analysis of Permanent Magnet Electrodynamic Suspension Systems

Rezaei¹,

Vaez‐Zadeh²

2014

PIER M

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“…The analyzed device is an electrodynamical bearing consisting of a magnetic rotor that levitates over a conducting sheet with an initial angular speed. The motion of the magnets induces eddy currents in the track that simultaneously create lift and drag forces.…”

Section: Application Examplementioning

confidence: 99%

A new predictor–corrector approach for the numerical integration of coupled electromechanical equations

Tripodi

Musolino

Rizzo

et al. 2015

Numerical Meth Engineering

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Summary In this paper, a new approach for the numerical solution of coupled electromechanical problems is presented. The structure of the considered problem consists of the low‐frequency integral formulation of the Maxwell equations coupled with Newton–Euler rigid‐body dynamic equations. Two different integration schemes based on the predictor–corrector approach are presented and discussed. In the first method, the electrical equation is integrated with an implicit single‐step time marching algorithm, while the mechanical dynamics is studied by a predictor–corrector scheme. The predictor uses the forward Euler method, while the corrector is based on the trapezoidal rule. The second method is based on the use of two interleaved predictor–corrector schemes: one for the electrical equations and the other for the mechanical ones. Both the presented methods have been validated by comparison with experimental data (when available) and with results obtained by other numerical formulations; in problems characterized by low speeds, both schemes produce accurate results, with similar computation times. When high speeds are involved, the first scheme needs shorter time steps (i.e., longer computation times) in order to achieve the same accuracy of the second one. A brief discussion on extending the algorithm for simulating deformable bodies is also presented. An example of application to a two‐degree‐of‐freedom levitating device based on permanent magnets is finally reported. Copyright © 2015 John Wiley & Sons, Ltd.

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“…Recently, Amati et al 101 revised the previously proposed models and expanded their validity to the cases of both axial EDBs and heteropolar radial EDBs. The revised models were used by Impinna et al 102 to analyze the stability of an axial suspension, putting in evidence the possible occurrence of instability. However, it was observed that the conditions needed to stabilize the axial dynamics can be satisfied easily by introducing a relatively small amount of damping.…”

Section: Axial Levitationmentioning

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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Passive Magnetic Levitation of Rotors on Axial Electrodynamic Bearings

Cited by 26 publications

References 18 publications

Modelling and Analysis of Permanent Magnet Electrodynamic Suspension Systems

Modelling and Analysis of Permanent Magnet Electrodynamic Suspension Systems

A new predictor–corrector approach for the numerical integration of coupled electromechanical equations

Progress on electrodynamic passive magnetic bearings for rotor levitation

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