Passive magnetic bearing for flywheel energy storage systems

Filatov, Alexei; Maslen, Eric H.

doi:10.1109/20.966127

Cited by 109 publications

(64 citation statements)

References 17 publications

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“…The structures considered have only one ring on both inner and outer parts. Then, bearings made of stacked ring magnets with alternate polarizations [26] are studied for the three kinds of polarizations, axial, radial and perpendicular. The latter are arranged so as to have Halbach patterns [27][28][29].…”

Section: Introductionmentioning

confidence: 99%

Halbach Structures for Permanent Magnets Bearings

Ravaud¹,

Lemarquand²,

Lemarquand³

2010

PIER M

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Abstract-This paper is the third part of a series dealing with permanent magnet passive magnetic bearings. It presents analytical expressions of the axial force and stiffness in radial passive magnetic bearings made of ring permanent magnets with perpendicular polarizations: the inner ring polarization is perpendicular to the outer ring one. The main goal of this paper is to present a simple analytical model which can be easily implemented in Matlab or Mathematica so as to carry out parametric studies. This paper first compares the axial force and stiffness in bearings with axial, radial and perpendicular polarizations. Then, bearings made of stacked ring magnets with alternate polarizations are studied for the three kinds of polarizations, axial, radial and perpendicular. The latter correspond to Halbach structures. These calculations are useful for identifying the structures required for having great axial forces and the ones allowing to get great axial stiffnesses.

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Section: Introductionmentioning

confidence: 99%

Halbach Structures for Permanent Magnets Bearings

Ravaud¹,

Lemarquand²,

Lemarquand³

2010

PIER M

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“…[14][15][16][17] The damping values of eddy current dampers are relatively low given the installation space they require, and so, in Filatov and Maslen, 18 an operational amplifier circuit was introduced to improve the damping value at the cost of a lowered cut-off frequency. Another approach to damping was shown in MacHattie, 19 where a needle surrounded by oil is magnetically coupled with the rotor movements.…”

Section: Dampingmentioning

confidence: 99%

Fundamental considerations on introducing damping to passively magnetically stabilized rotor systems

Marth

Jungmayr

Amrhein

2016

Advances in Mechanical Engineering

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When designing passively magnetically stabilized rotor systems, introducing sufficient damping is key. We investigated two different dynamic systems-with one mass and two masses-to determine their theoretical optimal behavior and how they can be realized considering real-world specifications and limitations. Based on dimensionless formulations of reduced dynamic systems, we present fundamental correlations between, and the optimal choice of, physical parameters. Furthermore, we compare the two systems in terms of feasibility and efficiency of different damping methods. Our investigations used an eddy current damper and viscoelastic damping elements as exemplary damping methods for the one-mass and two-mass systems, respectively. Passive stabilization was realized by means of permanent magnetic bearings. We found that the two-mass system is preferable due to the broader range of damping possibilities.

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“…In the previous researches, the cylinder conductors and short-circuits coils were commonly used in the conductor configuration in EDBs [1,[9][10][11][12][13][14]. However, it is not sufficient for them to meet the above requirements.…”

Section: Introductionmentioning

confidence: 99%

“…The earliest application of electrodynamic bearings dates back to the 1980s and 1990s -used for flywheels [3][4][5][6][7][8][9][10][11][12][13][14][15] because electrodynamic bearings' features matched flywheels' requirements very well. Firstly, flywheels typically work at the state of high-speed rotation, and it is at such high rotation speed that electrodynamic bearings can realize levitation; secondly, stiffness and rotation precision are not core requirements of flywheels, which are also drawbacks of electrodynamic bearings.…”

Section: Introductionmentioning

confidence: 99%

A Novel Flexible PCB Conductive Structure for Electrodynamic Bearings and Measurement in its Induced Voltage

Ding¹,

Sandtner²,

Bleuler³

2015

Journal of Electrical Engineering and Technology

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-This paper proposes the concept of FlexPCB(flexible Printed Circuit Board) conductive structure for electrodynamic bearings. It has three main advantages: easy "printing" of considerably thin conductive wires, resulting in potential reduction in stray eddy currents; realization of specific conductive configurations with high precision to optimize the eddy current flowing; simplicity in being wound to cylinders or hollow cylinders of different diameters. To verify this new concept, the FlexPCB conductive structure was manufactured, an axial electrodynamic bearing test rig was built and the conductive structure's induced voltage was measured along the axial displacements from 0mm to 56mm at three rotating speeds. The finite element method was used to calcuatlate the flux density of electrodynamic bearing and induced voltage of the FlexPCB conductive structure. The experimental results are compared with the results from the FEM calculation. It is concluded that the measured and calculated induced voltages have consistency in the middle part of the bearing.

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Passive magnetic bearing for flywheel energy storage systems

Cited by 109 publications

References 17 publications

Halbach Structures for Permanent Magnets Bearings

Halbach Structures for Permanent Magnets Bearings

Fundamental considerations on introducing damping to passively magnetically stabilized rotor systems

A Novel Flexible PCB Conductive Structure for Electrodynamic Bearings and Measurement in its Induced Voltage

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