Electromagnetic Axial Bearing With Reduced Thrust-Disc Diameter for High-Speed Machines

Prasad, KNV and Narayanan, G (2024) Electromagnetic Axial Bearing With Reduced Thrust-Disc Diameter for High-Speed Machines. In: IEEE Transactions on Industrial Electronics .

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Abstract

Electromagnetic axial bearings (EABs) are preferred over conventional thrust bearings for their contactless and lubrication-free operation,besides longer life in supporting the rotor of an electrical machine against axial forces. An EAB exerts a magnetic force on a thrust disc,attached normally to the shaft,countering the axial forces on the rotor. For large axial forces,the thrust disc should also have a large area,which can adversely affect the mechanical stresses,rotordynamics,and maximum operating speed. This article aims to arrive at a modified EAB geometry,along with a systematic design procedure,to reduce the thrust disc diameter significantly for a given load capacity. First,an improved design procedure is proposed for the conventional geometry EAB,which maximizes force density per unit MMF. A modified geometry and the proposed design procedure are then utilized to achieve an EAB of a given load capacity,but with a significant reduction in the thrust-disc diameter. Laboratory prototypes of both geometries are fabricated and are compared theoretically and experimentally. The modified geometry is shown to achieve a comparable load capacity as that of the conventional geometry,with the thrust-disc diameter reduced by 30,along with about 50 reduction in peak material stress. © 1982-2012 IEEE.

Item Type:	Journal Article
Publication:	IEEE Transactions on Industrial Electronics
Publisher:	Institute of Electrical and Electronics Engineers Inc.
Additional Information:	The copyright for this article belongs to the publishers.
Keywords:	Asynchronous machinery; Computer resource management; Disks (machine components); Magnetic bearings; Structural analysis; Structural dynamics, Active Magnetic Bearing; Axial forces; Contactless bearings; Design procedure; Disk diameters; Electromagnetic bearings; Electromagnetics; High speed machine; Power electronic control; Thrust magnetic bearing, Thrust bearings
Department/Centre:	Division of Electrical Sciences > Electrical Engineering
Date Deposited:	23 Nov 2024 18:11
Last Modified:	23 Nov 2024 18:11
URI:	http://eprints.iisc.ac.in/id/eprint/86846

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