Magnetic Bearing Sets for a Flywheel System

Sotelo, Guilherme Gonçalves; Andrade, R. de; Ferreira, A.C.

doi:10.1109/tasc.2007.899268

Cited by 62 publications

(30 citation statements)

References 13 publications

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“…In all of the aforementioned works, axial and radial force/stiffness are measured as a function of axial and radial displacement, respectively, while the other dimension is maintained in its nominal position. In [13], the reduction in axial force at one particular radial displacement is given, but the effect of radial displacement is not investigated beyond this one point.…”

Section: A Measurement Goalsmentioning

confidence: 99%

“…• the rotor and stator are somehow mechanically displaced from each other and a device (such as a load cell) is used to measure the force along that direction for various displacements [3], [6], [7], [10], [13]- [15];…”

Section: B Measurement Techniquesmentioning

confidence: 99%

“…• extract the stiffness from the force data by fitting a linear regression line to the data as a function of displacement for small displacements [3], [6], [8], [10], [13], [15];…”

Section: B Measurement Techniquesmentioning

confidence: 99%

See 2 more Smart Citations

Design and measurement of a passive thrust magnetic bearing for a bearingless motor

Severson

Røkke

Nilssen

et al. 2013

IECON 2013 - 39th Annual Conference of the IEEE Industrial Electronics Society

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Abstract-The design and construction of a permanent magnet thrust bearing for a bearingless motor is presented and a measurement technique is proposed to characterize the bearing. Optimal design of a bearingless motor requires the machine designer to be aware of the axial bearing's performance under simultaneous axial and radial displacement. A simple, low-cost test setup which requires only two single-axis load cells is proposed and evaluated to make these measurements on the magnetic bearing stator. The measurement data are found to be in reasonable agreement with finite element calculations and to satisfy Earnshaw's theorem, where the sum of stiffnesses in the three axes must be zero. The measurement technique displayed good test-retest reliability, with repeated radial force data having an average standard deviation of 2.1% for radial displacements greater than 0.5 mm and axial force data having a typical error of 0.9%.

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Section: A Measurement Goalsmentioning

confidence: 99%

Section: B Measurement Techniquesmentioning

confidence: 99%

See 1 more Smart Citation

Design and measurement of a passive thrust magnetic bearing for a bearingless motor

Severson

Røkke

Nilssen

et al. 2013

IECON 2013 - 39th Annual Conference of the IEEE Industrial Electronics Society

View full text Add to dashboard Cite

show abstract

“…Thereby, at least one degree of freedom has to be controlled by some other means. Even then, these types of bearings are quite attractive and due to their advantages these have been used extensively in various applications like wind turbines, flywheel systems, ventricular assist device and spacecraft applications [5][6][7]. Tian et al [8] have developed 2D analytical equations for axial and radial force in conventional and rotational magnetized stack structured PM bearings made up of 'n' number of ring pairs.…”

Section: Introductionmentioning

confidence: 99%

Utilization of Low Computational Cost Two Dimensional Analytical Equations in Optimization of Multi Rings Permanent Magnet Thrust Bearings

Bekinal¹,

Doddamani²,

Dravid³

2017

PIER M

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Abstract-Replacement of conventional bearings by passive magnetic bearings for high-speed applications, in terms of their performance will be effective, if the design is carried out by optimizing the geometrical dimensions in the given control volume. Present work deals with modification and utilization of two-dimensional (2D) analytical equations in optimization of multi rings permanent magnet (PM) thrust bearing configurations. Conventional and rotational magnetized direction (RMD) configurations are selected in optimizing the design variables for maximum bearing characteristics in a given volume with a constant aspect ratio. The design variables chosen for optimization are axial offset of rotor, number of rings, radial air thickness and inner diameter of the rotor and stator PM rings. MATLAB codes for solving 2D equations are developed in optimizing configuration variables. Further, optimized parameter values of the two configurations are compared. Finally, optimized results obtained using 2D and three-dimensional (3D) equations for the conventional configuration with same aspect ratio are compared, and conclusions are presented.

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“…The PM rings can be radially or axially stacked (Yonnet, 1991) in order to increase the axial force. Topologies with (Sotelo, de Andrade and Ferreira, 2007) or without (Yoo, Kim, Kim, Lee, Bae, and Noh, 2011) soft magnetic materials are studied in the literature. The use of highly permeable material (back-iron) increases the performance of PM bearings for a same PM volume (Jungmayr, Marth, Amrhein, Berroth and Jeske, 2014).…”

Section: Introductionmentioning

confidence: 99%

Comparison between optimized topologies of permanent magnet thrust bearings with back-iron

Beneden

Kluyskens

Dehez

2017

Mechanical Engineering Journal

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This paper deals with the optimization and the comparison of passive magnetic thrust bearings made up of radial stacks of permanent magnet rings. Various topologies are considered, depending on the polarization direction of the permanent magnet rings and the presence of back-iron. The coulombian approach and the method of image charges are used to determine the load capacity of topologies with back-iron. On this basis each topology is optimized in order to minimize the permanent magnet volume for a fixed load capacity, airgap thickness and remanent flux density. Varying these parameters, scaling laws of the optimum permanent magnet ring dimensions are derived to allow fast sizing and comparison of the topologies. The latter highlights that the topology with Halbach configuration and back-iron is the most performant, but that the topology with axial polarization is almost as good.

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Magnetic Bearing Sets for a Flywheel System

Cited by 62 publications

References 13 publications

Design and measurement of a passive thrust magnetic bearing for a bearingless motor

Design and measurement of a passive thrust magnetic bearing for a bearingless motor

Utilization of Low Computational Cost Two Dimensional Analytical Equations in Optimization of Multi Rings Permanent Magnet Thrust Bearings

Comparison between optimized topologies of permanent magnet thrust bearings with back-iron

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