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2013-11-08
Permanent Magnet Thrust Bearing: Theoretical and Experimental Results
By
Progress In Electromagnetics Research B, Vol. 56, 269-287, 2013
Abstract
This paper presents the design and analysis of permanent magnet (PM) thrust bearing made up of three ring pairs for five degrees of freedom of the inner rings (rotor rings). The arrangement pattern of rings in PM bearing is considered in two ways: conventional structure and Halbach structure. The simplified three dimensional (3D) mathematical models employing Coulombian approach and vector method are used to design the bearing. MATLAB codes are written to evaluate the axial force, stiffness and moments in both the structures for five degrees of freedom, thereby the effect of axial, radial and angular displacements of the rotor on the aforementioned characteristics is addressed. The results of the mathematical model are validated by the results of 3D Finite Element Analysis (FEA) and experiments. It is observed that, the conventional structure seems to be more sensitive to the angular displacement, as the percentage decrease in force and stiffness is more with respect to angular displacement than the Halbach structure. The effect of angular displacement of the rotor on the performance of bearing in both the structures is crucial.
Citation
Siddappa Iranna Bekinal, Anil Tumkur Ramakrishna, Soumendu Jana, Sadanand Subhas Kulkarni, Aditya Sawant, Narsinha Patil, and Sagar Dhond, "Permanent Magnet Thrust Bearing: Theoretical and Experimental Results," Progress In Electromagnetics Research B, Vol. 56, 269-287, 2013.
doi:10.2528/PIERB13101602
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