Optimal design of non-contact thrust bearing using permanent magnet rings

Yoo, Seong-Yeon; Kim, Woo Yeon; Kim, Seung-Jong; Lee, Wook Ryun; Bae, Yong-Chae; Noh, Myounggyu

doi:10.1007/s12541-011-0134-4

Cited by 22 publications

(17 citation statements)

References 13 publications

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“…Two different approaches, namely, Lorentzian [16][17][18] and Coulombian [20][21][22][23][24][25] are available to determine the forces. In former approach the permanent magnet is considered as planes with equivalent currents, while the equivalent charge density in the later one.…”

Section: Mathematical Modelingmentioning

confidence: 99%

“…Analytical approach is faster investigation method as compared to the latter ones for the parametric study. The analytical equations for determining the magnetic field [9][10][11][12][13][14], force and stiffness [15][16][17][18][19][20][21][22] in bearings with axial, radial and perpendicular polarizations are presented by the many researchers recently. However in these works, the ring magnets are concentric, which might not be prevailing in actual scenario.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of Radial Magnetized Permanent Magnet Bearing Characteristics

Bekinal¹,

Anil²,

Jana³

2013

PIER B

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Abstract-With an increase in the number of high speed applications, researchers have been concentrating on permanent magnet bearings due to their suitability. This paper presents a mathematical model of a permanent magnet bearing made of ring magnets with radial polarizations. Coulombian model and vector approach are used to estimate the force, moment and stiffness. A MATLAB code is developed for evaluating the envisaged parameters for three degrees (translational) of freedom of the rotor. Comparison of force and stiffness results of the presented model with that reported in the literature and also with the results of 3D finite element analysis shows good agreement. Then, it is extended to analyse stacked ring magnets with alternate radial polarizations. Finally, the cross coupled stiffness values in addition to the principal stiffness values are presented for the elementary structure and also for stacked structure with three ring permanent magnets with alternate radial polarizations.

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Section: Mathematical Modelingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Analysis of Radial Magnetized Permanent Magnet Bearing Characteristics

Bekinal¹,

Anil²,

Jana³

2013

PIER B

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“…Conventional multi rings radial passive magnetic bearing is optimized by Moser et al [10] for maximum radial stiffness using 2D FEA. Yoo et al [11] optimized noncontact thrust bearings for maximum axial force using 2D equations. Lijesh and Hirani [12] optimized radial passive magnetic bearing with a single ring pair using modified 2D equations.…”

Section: Introductionmentioning

confidence: 99%

“…[11,14], optimization is carried out by considering equal radial ring thickness ((R2 − R1) = (R4 − R3)) leading to partial optimization.…”

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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“…After that, Groom and Antaki [9] extended its application, and researched the stiffness and loading capacity in stacked-structure radial bearing. For achieving a requiring loading capacity under minimum magnet volume, Yoo et al [10] investigated two types of magnet aliment for thrust bearing, and compared their performance theoretically and experimentally. Sobotka and Lange [11] researched different configurations of passive magnetic bearings.…”

Section: Introductionmentioning

confidence: 99%

Magneto-aerostatic bearing for miniature air turbine

Huang¹,

Chang²

2014

Mechanics & Industry

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-Under the circumstance of pursuing high speed and miniaturization, mini-type air turbines have been widely applied to high-speed dental handpieces in recent years. Among all the components of a mini-type air turbine, bearing is the most important part which significantly affects its efficiency. Friction, collision, and wear are the main causes to make the ball bearing unable to reach higher efficiency. Though very small sliding friction can be realized by the aerostatic bearing, its poor bearing capacity limits the application. This research combines the magnetic and aerostatic levitation principle to develop a magnetoaerostatic hybrid bearing for miniature air turbine. The aerostatic bearing undertakes the main function of the radial and the axial bearings. However, the air bearing also possesses a drawback, which is pneumatic hammer effect induced by the air compressibility. In order to eliminate the pneumatic instability, an axial passive magnetic bearing is integrated into the aerostatic bearing. With the magnetic bearing, not only the bearing capacity can be improved, but also the pneumatic hammer effect can be significantly damped. Both theoretical calculation and finite element method (FEM) are used to study the cause and elimination solution of the pneumatic instability. Through experimental testing, the performance of our developed magneto-aerostatic bearing is also verified. The magneto-aerostatic bearing suppresses the axial vibration over 57%, and also enhances its axial bearing capacity by 50%.

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Optimal design of non-contact thrust bearing using permanent magnet rings

Cited by 22 publications

References 13 publications

Analysis of Radial Magnetized Permanent Magnet Bearing Characteristics

Analysis of Radial Magnetized Permanent Magnet Bearing Characteristics

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

Magneto-aerostatic bearing for miniature air turbine

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