Model based design of a rotor supported by radial electrodynamic bearings

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

doi:10.1533/9780857094537.2.123

Cited by 4 publications

(6 citation statements)

References 8 publications

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“…The benefits of rotating systems equipped with combined AMBs/AMDs and EDBs are investigated in the present paper from both the modeling and experimental point of view. The experimental results obtained by a dedicated test rig supported by combined AMBs/ AMDs and EDBs confirm the following: the validity of the models presented in the literature when EDBs are acting on a real rotor; 4,11,14,15 the role that EDBs can play in a rotor when assembled in combination with AMBs/AMDs; Figure 9. Forces developed by a single EDB when the rotor is running with a static eccentricity of 0.1 mm.…”

Section: Discussionsupporting

confidence: 76%

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Test and theory of electrodynamic bearings coupled to active magnetic dampers

Amati

Impinna

Detoni

et al. 2016

Proceedings of the Institution of Mechanical Engineers, Part I:

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Electrodynamic bearings exploit repulsive forces due to eddy currents to produce positive stiffness by passive means. Such a feature would make this type of bearing a viable alternative to active and permanent magnet bearings. Although electrodynamic bearings do not violate Earnshaw's theorem, the open issue remains the stabilization system that is needed to make the rotating body stable, due to the low rotational speeds. Stabilizing solutions proposed in the literature are partially effective and not totally convincing. This limits real industrial applications.The present paper proposes a combination of electrodynamic and active magnetic bearings. At low speed the active part behaves as a conventional active magnetic bearing, while at high speed it provides damping. The readiness of the proposed solution is demonstrated by experimental results obtained using a dedicate test rig.

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Section: Discussionsupporting

confidence: 76%

“…The EDBs (4 in Figure 2) have a double flux homopolar configuration 10 to improve stiffness and minimize the power losses 11…”

Section: Edb/amb/amd Test Rigmentioning

confidence: 99%

Test and theory of electrodynamic bearings coupled to active magnetic dampers

Amati

Impinna

Detoni

et al. 2016

Proceedings of the Institution of Mechanical Engineers, Part I:

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“…The stiffness at 35 krpm was 210 N/mm and a damping coefficient of 244 Ns/mm was observed. A radial homopolar EDB was modeled using FEA [38] to understand its dynamic behavior under quasi-static conditions and the results of the simulations were used to compare with the analytical model developed by Amati et al [19]. The hexahedral mesh was used to model the EDB.…”

Section: B Finite Element Analysismentioning

confidence: 99%

“…It was seen that lift and drag forces were limited due to the introduction of inductive circuits in the coil. Moreover, the model developed in [19], [38] was validated experimentally. A test rig was built, and tests were performed by exciting the EDB's stator using a force introduced by an instrumented hammer.…”

Section: Experimentationmentioning

confidence: 99%

An Overview on Electrodynamic Bearings

Bekinal

Shivamurthy

2022

IEEE Access

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In electrodynamics, the levitation ensues when there is a relative motion between a stator and a conductor owing to which high eddy currents are induced. The repulsive forces generated by eddy currents are large enough to carry the moving body passively without violating Earnshaw's criterion. Electrodynamic bearings (EDB) use this technique to levitate the rotor in axial or radial degrees of freedom. The present article reviews the literature on electrodynamic passive magnetic bearings to provide an in-depth examination of EDB modeling, analysis, and development. Different types of EDB configurations are highlighted, along with improvements in their technology. In addition, essential advancements in mathematical modeling, finite element techniques, and experiments used to determine the bearing characteristics in terms of accuracy are highlighted. Furthermore, critical developments in rotordynamic analysis in terms of high-speed application have been reviewed. Finally, advances in the application of EDB are discussed.

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“…Initially the model was validated only under quasi-static condition resorting to the data from FE simulations provided by Lembke. 62 The aforementioned work was extended in several succeeding papers, which dealt with the FE modelling, [76][77][78] application design, 79 and experimental validation of the proposed models. 48,80 In these last works, a large collection of experimental data was used for model validation under both quasi-static and dynamic conditions.…”

Section: Homopolar 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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Model based design of a rotor supported by radial electrodynamic bearings

Cited by 4 publications

References 8 publications

Test and theory of electrodynamic bearings coupled to active magnetic dampers

Test and theory of electrodynamic bearings coupled to active magnetic dampers

An Overview on Electrodynamic Bearings

Progress on electrodynamic passive magnetic bearings for rotor levitation

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