Research Papers: Other (Seals, Manufacturing)

Magnetic Bearing Using Rotation Magnetized Direction Configuration

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

Department of Mechanical Engineering,
Indian Institute of Technology Delhi,
New Delhi 110016, India
e-mail: lijesh_mech@yahoo.co.in

Harish Hirani

Department of Mechanical Engineering,
Indian Institute of Technology Delhi,
New Delhi 110016, India
e-mail: hirani@mech.iitd.ac.in

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received December 8, 2014; final manuscript received March 28, 2015; published online May 25, 2015. Assoc. Editor: Bugra Ertas.

J. Tribol 137(4), 042201 (Oct 01, 2015) (11 pages) Paper No: TRIB-14-1304; doi: 10.1115/1.4030344 History: Received December 08, 2014; Revised March 28, 2015; Online May 25, 2015

Passive magnetic bearing (PMB), made of high remanence rare earth permanent magnets, is brittle in nature; therefore, precautions must be taken to reduce the chances of vibration transmitting to the permanent magnets. In the present work, a rotation magnetized direction (RMD) structure made of aluminum ring and square shaped magnetic pieces has been proposed. A comparative study of load carrying capacities of sector magnets and square magnets has been presented. Three-dimensional (3D) Coulombian model was solved to estimate the load carrying capacity. Theoretical and experimental studies on the load carrying capacities of full ring magnet (more prone to cracking) and the proposed structure have been presented to prove the superiority of the proposed structure. In addition to load capacity, comparison between amplitudes of vibration at different frequencies, orbit plots, and time taken for breakage of the magnets at the resonance frequency has been presented.

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Fig. 1

Cracked stator of magnetic bearing

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Fig. 2

Different arrangement of magnets to increase the load carrying capacity: (a) conventional stack and (b) RMD stack

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Fig. 3

Full ring magnetic bearing: (a) front view and (b) sectional side view

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Fig. 4

Configuration 2: cylindrical rotor and stator with square magnets: (a) front view and (b) sectional side view

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Fig. 5

Sector magnets: (a) front view and (b) sectional side view

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Fig. 6

Cuboidal magnets: (a) front view and (b) sectional side view

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Fig. 7

Comparison of vertical forces between square and sector magnets

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Fig. 8

Configuration 3: RMD configuration: (a) front view and (b) sectional side view

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Fig. 9

The (a) radial and (b) perpendicular polarized magnetic bearings

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Fig. 10

Experimental setup for magnetic bearing: (a) left side view, (b) right side view, and (c) similar triangle to estimate the deflection at bearing end

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Fig. 11

Full ring and structure with square magnets along with rotor: (a) full ring magnet, (b) proposed structure, and (c) rotor

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Fig. 12

Rotor for RMD configuration: (a) rotor and (b) rotor structure with square magnet

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Fig. 13

RMD configuration and its possible different arrangements: (a) RMD configuration and (b) different arrangement of RMD configurations

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Fig. 14

Magnetic flux density plot and theoretical and experimental comparison of load carrying capacity of three configurations: (a) magnetic flux density along the axial length, (b) Gauss meter, and (c) comparison of load carrying capacity of different configurations

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Fig. 15

Magnetic bearing setup for dynamic condition

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Fig. 16

Vertical acceleration signal and orbit plot for full ring and proposed RMD magnetic bearing: (a) acceleration at different frequencies and (b) orbit plot

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Fig. 17

Amplitude of acceleration of full ring

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Fig. 18

Full ring bearing with crack

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Fig. 19

Proposed RMD bearing




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