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Research Papers: Magnetic Storage

A Pragmatic Optimization of Axial Stack-Radial Passive Magnetic Bearings

[+] Author and Article Information
K. P. Lijesh

Rotor Dynamics Laboratory,
Department of Mechanical Engineering,
National Institute of Technology Karnataka,
Surathkal 575025, India
e-mail: lijesh_mech@yahoo.co.in

Mrityunjay Doddamani

Rotor Dynamics Laboratory,
Department of Mechanical Engineering,
National Institute of Technology Karnataka,
Surathkal 575025, India
e-mail: mrdoddamani@nitk.edu.in

S. I. Bekinal

Department of Mechanical Engineering,
KLS Gogte Institute of Technology,
Belagavi 590008, Karnataka, India
e-mail: sibekinal@git.edu

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received March 14, 2017; final manuscript received August 26, 2017; published online October 12, 2017. Assoc. Editor: Daejong Kim.

J. Tribol 140(2), 021901 (Oct 12, 2017) (9 pages) Paper No: TRIB-17-1087; doi: 10.1115/1.4037847 History: Received March 14, 2017; Revised August 26, 2017

Passive magnetic bearing's (PMB) adaptability for both lower and higher speed applications demands detailed and critical analysis of design, performance optimization, and manufacturability. Optimization techniques for stacked PMB published in recent past are less accurate with respect to complete optimum solution. In this context, the present work deals with a pragmatic optimization of axially stacked PMBs for the maximum radial load using three-dimensional (3D) equations. Optimization for three different PMB configurations, monolithic, conventional, and rotational magnetized direction (RMD), is presented based on the constraints, constants, and bounds of the dimensions obtained from published literature. Further, to assist the designers, equations to estimate the mean radius and clearance being crucial parameters are provided for the given axial length and outer radius of the stator with the objective of achieving maximum load-carrying capacity. A comparison of the load-carrying capacity of conventional stacked PMB using the proposed equation with the equation provided in literature is compared. Finally, effectiveness of the proposed pragmatic optimization technique is demonstrated by analyzing three examples with reference to available literature.

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References

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Figures

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Fig. 1

Configurations of PMB: (a) monolithic, (b) conventional, and (c) RMD

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Fig. 2

Configuration 1: coordinates of magnetic bearing. (a) Front view and (b) sectional side view.

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Fig. 3

Convergence of the function value

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Fig. 4

Variation of parameters of conventional PMB with number of stacking: (a) no. of stacking versus load and volume and (b) no. of stacking versus Rm and C

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Fig. 5

Variation of parameters of RMD configured PMB with number of stacking: (a) no. of stacking versus load and volume and (b) no. of stacking versus Rm and C

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Fig. 6

Radial force as a function of number of layers for configurations 2 and 3 having same radial thickness of rotor and stator magnets and optimization results

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Fig. 7

Variation of RL and RC with respect to L for configuration 2: (a) RL versus L and (b) RC versus L

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Fig. 8

Radial load versus number of stacking for different outer radius values in configuration 2

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Fig. 9

Variation of RL and RC with respect to L in configuration 2: (a) Rm versus L and (b) C versus L

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Fig. 10

Estimated and predicted values of RL and RC for different values of R4 = 0.065 m, 0.055 m, and 0.045 m for configuration 2: (a) RL versus L and (b) RC versus L

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Fig. 11

Radial load versus number of stacking for different outer radius values for configuration 3

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Fig. 12

Variation of RL and RC with respect to L for configuration 3: (a) RL versus L and (b) RC versus L

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Fig. 13

Estimated and predicted values of RL and RC with respect to L for configuration 3 and for different values of R4: (a) RL versus L and (b) RC versus L

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Fig. 14

Estimated values of Rm and C and comparison of loads obtained from dimension from Ref. [17] and for estimated Rm and C, for configuration 2: (a) Rm and C values with respect to n and (b) load versus n

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Fig. 15

Comparison of loads obtained for dimension provided in literatures and for estimated Rm and C: for case 2 (a) [6] and case 3 (b) [15], for configuration 2

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Fig. 16

Comparison of loads obtained for dimensions provided in literatures and estimated Rm and C: for cases 1–3, for configuration 3. (a) Case 1, (b) case 2, and (c) case 3.

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