Analysis and feedback control of magnetic bearings with reference to flywheel energy storage.

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dc.contributor.advisorEnslin, NC de Ven_ZA
dc.contributor.authorBredenkamp, Gordon Leslieen_ZA
dc.date.accessioned2014-09-22T07:51:09Z
dc.date.available2014-09-22T07:51:09Z
dc.date.issued1984en_ZA
dc.descriptionBibliography: leaves 132-136.en_ZA
dc.description.abstractIn high speed applications magnetic bearings offer many potential advantages over mechanical bearings. The type of magnetic bearing most suitable for energy storage flywheels is selected and analysed for the purpose of designing feedback control loops. A nonlinear as well as a small signal linear model of the "current driven" magnetic bearing with unlaminated magnetic components is derived. Subsequently describing functions characterising the small- as well as large signal behaviour of the same bearing in the "voltage driven" mode, are obtained. It is shown that workable results are obtained for most practical situations by using linear systems theory, although the magnetic bearing is a nonlinear device. The describing function model enables the designer to identify the mechanisms leading to limit cycles under adverse operating conditions. Feedback control loops designed around the small signal characteristics produce practical results in the case of the "voltage driven" mode which are superior to that of the "current driven" case. An essential refinement, where energy losses and vibrations arising from rotor imbalance are eliminated, is described. A discrete time filtering technique is used. Two experimental models were built and fully tested in order to verify the above theoretical approaches.en_ZA
dc.identifier.apacitationBredenkamp, G. L. (1984). <i>Analysis and feedback control of magnetic bearings with reference to flywheel energy storage</i>. (Thesis). University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Electrical Engineering. Retrieved from http://hdl.handle.net/11427/7585en_ZA
dc.identifier.chicagocitationBredenkamp, Gordon Leslie. <i>"Analysis and feedback control of magnetic bearings with reference to flywheel energy storage."</i> Thesis., University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Electrical Engineering, 1984. http://hdl.handle.net/11427/7585en_ZA
dc.identifier.citationBredenkamp, G. 1984. Analysis and feedback control of magnetic bearings with reference to flywheel energy storage. University of Cape Town.en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Bredenkamp, Gordon Leslie AB - In high speed applications magnetic bearings offer many potential advantages over mechanical bearings. The type of magnetic bearing most suitable for energy storage flywheels is selected and analysed for the purpose of designing feedback control loops. A nonlinear as well as a small signal linear model of the "current driven" magnetic bearing with unlaminated magnetic components is derived. Subsequently describing functions characterising the small- as well as large signal behaviour of the same bearing in the "voltage driven" mode, are obtained. It is shown that workable results are obtained for most practical situations by using linear systems theory, although the magnetic bearing is a nonlinear device. The describing function model enables the designer to identify the mechanisms leading to limit cycles under adverse operating conditions. Feedback control loops designed around the small signal characteristics produce practical results in the case of the "voltage driven" mode which are superior to that of the "current driven" case. An essential refinement, where energy losses and vibrations arising from rotor imbalance are eliminated, is described. A discrete time filtering technique is used. Two experimental models were built and fully tested in order to verify the above theoretical approaches. DA - 1984 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 1984 T1 - Analysis and feedback control of magnetic bearings with reference to flywheel energy storage TI - Analysis and feedback control of magnetic bearings with reference to flywheel energy storage UR - http://hdl.handle.net/11427/7585 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/7585
dc.identifier.vancouvercitationBredenkamp GL. Analysis and feedback control of magnetic bearings with reference to flywheel energy storage. [Thesis]. University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Electrical Engineering, 1984 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/7585en_ZA
dc.language.isoengen_ZA
dc.publisher.departmentDepartment of Electrical Engineeringen_ZA
dc.publisher.facultyFaculty of Engineering and the Built Environment
dc.publisher.institutionUniversity of Cape Town
dc.subject.otherElectrical engineeringen_ZA
dc.titleAnalysis and feedback control of magnetic bearings with reference to flywheel energy storage.en_ZA
dc.typeDoctoral Thesis
dc.type.qualificationlevelDoctoral
dc.type.qualificationnamePhDen_ZA
uct.type.filetypeText
uct.type.filetypeImage
uct.type.publicationResearchen_ZA
uct.type.resourceThesisen_ZA
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