A novel twin-shaft rotor layout with active magnetic couplings for vibration control

Chris Lusty, Necip Sahinkaya, Patrick Keogh

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A novel rotor topology is proposed with the goal of reducing vibration in high speed rotor systems. Reduction in vibration at critical speeds is targeted. In essence, the novel topology consists of a hollow tube rotor coupled to a secondary nonrotating shaft located concentrically within the primary rotor. The two shafts are linked via a number of actively managed magnetic couplings. The topology is provided, along with an analysis comparing the out-of-balance vibration response of the proposed rotor to a comparable simple passive rotor. Designs for a test rig based on this topology are presented, together with an outline of anticipated testing and development of the idea. Special consideration is given to the design of the magnetic bearings, which form the system couplings. An internal-stator homopolar bearing design fabricated from Soft Magnetic Composite (SMC) is presented. The qualities of SMC as a bearing core material are shown to be comparable with a standard laminated core with the added advantage of minimal eddy current losses within the primary rotor.
Original languageEnglish
Pages (from-to)266-276
Number of pages25
JournalProceedings of the Institution of Mechanical Engineers, Part I: Journal of Systems and Control Engineering
Issue number3
Early online date20 Jan 2016
Publication statusPublished - Mar 2016


  • Rotor Dynamics, Vibrations, Magnetic Bearings, Soft Magnetic Composite


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