Modeling and evaluation of damping coefficient of eddy current dampers in rotordynamic applications

Detoni, Joaquim Girardello; Cui, Qingsong; Amati, Nicola; Tonoli, Andrea

doi:10.1016/j.jsv.2016.03.013

Cited by 27 publications

(22 citation statements)

References 18 publications

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“…Despite the attractive features, the major issue associated with PMB is low damping. Active [26], as well as passive dampers [27,28], could be used to increase damping in PMB. The use of active dampers makes the bearing system bulky due to the presence of electronic components.…”

Section: Introductionmentioning

confidence: 99%

Optimum Design Methodology for Axially Polarized Multi-Ring Radial and Thrust Permanent Magnet Bearings

Bekinal¹,

Doddamani²

2020

PIER B

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This article deals with the generalized procedure of designing and optimizing multi-ring radial and thrust permanent magnet bearings (PMBs) with an axial air gap for maximum force and stiffness per volume of the magnet. Initially, the procedure of determining optimized design variables in both the configurations is presented using the MATLAB codes written for solving the three dimensional (3D) equations of force and stiffness in PMB having 'n' number of rings on the stator and rotor. The maximized results of the forces in both radial and thrust multi-ring PMBs are validated with the values obtained using finite element analysis (FEA). Then, the correlation between the optimized parameters and the air gap is obtained, and curve fit equations for the same are proposed in terms of stator outer diameter. Further, curve fit equations establishing the relationship between the maximized bearing features, and the aspect ratio (L/D4) of the bearing are expressed for different values of air gap in both the radial and thrust bearings. Finally, the generalized method of designing and optimizing the multi-ring PMB is demonstrated with a specific application. A designer can use the presented curve fit equations for optimizing design variables and calculating maximized bearing features in multi-ring radial and thrust PMBs easily just by knowing the bearing features for a single ring pair.

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Section: Introductionmentioning

confidence: 99%

Optimum Design Methodology for Axially Polarized Multi-Ring Radial and Thrust Permanent Magnet Bearings

Bekinal¹,

Doddamani²

2020

PIER B

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“…Normally, for avoiding the associated power dissipation with eddy currents, PMs are used for supporting weight and active damper [17] or ECDs are used for introducing the required damping force. ECDs can be realised by a disk conductor placed in the air gap with axial flux [18][19][20][21][22][23][24] or cylindrical conductor placed in the air gap with radial flux [25][26][27]. As the magnets on the rotor move laterally or axially, currents induced in the conductor produce a damping force.…”

Section: Introductionmentioning

confidence: 99%

“…The authors in [19] calculated the damping force of a disk conductor in a constant magnetic field space while considering the dynamics of the rotation. The authors in [20][21][22][23][24][25] obtained the parameters characterising the ECD's mechanical impedance by employing an analytical dynamic model of the ECD and curve fitting with experimental results or results of finite element method (FEM). A complete study of FEM modelling of EDBs is presented in [26].…”

Section: Introductionmentioning

confidence: 99%

Optimal design of a compact passive magnetic bearing based on dynamic modelling

Safaeian

Heydari

2019

IET Electric Power Applications

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Passive magnetic bearings offer significant advantages relative to common active magnetic bearings, such as simple, robust, and efficient structure. Permanent magnet (PM) passive magnetic bearings are composed of opposing magnet rings on rotor and stator. Although their stiffness has been improved using alternating or Halbach magnetisations in many previous studies, they still suffer from lack of damping force. In this study, the optimal design is focused on a combination of PM bearing and eddy current damper by adding a conductive layer along the magnets of the stator or rotor. This will moderate the magnetic material consumptions; thereby, the cost and overall size of the bearing are reduced. A complete analytical method is performed to calculate the stiffness and axial, radial, and rotating damping coefficients. The accuracy of the analytical model is estimated quantitatively using 3D finite element method simulations. Moreover, all of the parameters are normalised and optimised for maximum stiffness and damping. ξ Fourier transforms parameter ω rotational speed

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“…For example, devices characterized by the presence of time-varying fields (e.g. eddy currents in alternating magnetic fields [8]- [13]) could not be affected by the instability problem. Other devices can be envisaged considering proper arrangements of PMs which are kept in motion nearby conductive domains.…”

Section: Introductionmentioning

confidence: 99%

Null-Flux Coils in Permanent Magnets Bearings

Musolino

Rizzo

Sani

et al. 2017

IEEE Trans. Plasma Sci.

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In this paper, the stability analysis of a new permanent magnets (PMs) bearings is presented and discussed. The suspension is assured by the repulsive force of properly shaped PMs placed on both the stator and the rotor. Then, exploiting currents induced on a system of null-flux coils attached to the stator, a stabilizing force for the translation of the center of mass of the rotor is obtained. The performance of the proposed bearing is investigated by a research code, previously developed at DESTEC and capable to simulate six degrees of freedom electromechanical devices

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Modeling and evaluation of damping coefficient of eddy current dampers in rotordynamic applications

Cited by 27 publications

References 18 publications

Optimum Design Methodology for Axially Polarized Multi-Ring Radial and Thrust Permanent Magnet Bearings

Optimum Design Methodology for Axially Polarized Multi-Ring Radial and Thrust Permanent Magnet Bearings

Optimal design of a compact passive magnetic bearing based on dynamic modelling

Null-Flux Coils in Permanent Magnets Bearings

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