Modelling the unbalanced magnetic pull in eccentric-rotor electrical machines with parallel windings

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.author Burakov, Andrej
dc.date.accessioned 2012-02-24T08:40:18Z
dc.date.available 2012-02-24T08:40:18Z
dc.date.issued 2007-10-25
dc.identifier.isbn 978-951-22-9006-2
dc.identifier.issn 1795-4584
dc.identifier.uri https://aaltodoc.aalto.fi/handle/123456789/2927
dc.description.abstract This research work is focused on developing simple parametric models of the unbalanced magnetic pull produced in eccentric-rotor electrical machines. The influence of currents circulating in the parallel paths of the stator winding on the unbalanced magnetic pull is given the main attention. The interaction between these currents and those circulating in the rotor cage/damper winding is also considered. First, a parametric force model for an eccentric-rotor salient-pole synchronous machine is developed. The effects of the parallel stator windings are not considered in this model. Next, a low-order parametric force model is built for electrical machines equipped with parallel stator windings but operating without the rotor cage/damper winding. This force model is applicable to salient-pole synchronous machines as well as to induction motors. And finally, a special force model is developed for electrical machines furnished with parallel paths both in the rotor and stator windings. This model accounts for the equalising currents circulating in the rotor and stator windings and also for the interaction between these currents. This third force model can be applied to a salient-pole synchronous machine and to an induction machine. The parameters of the force models are estimated from the results of numerical simulations applying a soft-computing-based estimation program. All the developed force models with the estimated parameters demonstrate a very good performance in a wide whirling frequency range. The effects of parallel paths in the rotor and stator windings on the unbalanced magnetic pull are investigated numerically. The acquired results reveal that the total unbalanced magnetic pull and its constituents related to the fundamental magnetic field and slotting are strongly affected by the presence of parallel paths in the stator winding. However, unlike the rotor cage, parallel stator windings may instigate anisotropy in the unbalanced magnetic pull. In such cases, the results of the numerical impulse response test may differ significantly from the conventional calculation results. It is also shown that, despite the fact that the number of parallel paths in the stator is often substantially lower than the number of parallel paths in the rotor, parallel stator windings may still provide a more efficient UMP mitigation than the rotor cage/damper winding. en
dc.format.extent 69, [65]
dc.format.mimetype application/pdf
dc.language.iso en en
dc.publisher Helsinki University of Technology en
dc.publisher Teknillinen korkeakoulu fi
dc.relation.ispartofseries TKK dissertations en
dc.relation.ispartofseries 93 en
dc.relation.haspart Burakov, A., Tenhunen, A., Arkkio, A. 2005. Applying Genetic Algorithms to identify the parameters of a low-order force model for a salient-pole synchronous machine with eccentric rotor. 8th International Conference on Modeling and Simulation of Electric Machines, Converters and Systems (ELECTRIMACS 2005), April 17-20, 2005, Hammamet, Tunisia, 5 p.
dc.relation.haspart Burakov, A., Arkkio, A. 2006. Low-order parametric force model for a salient-pole synchronous machine with eccentric rotor. Electrical Engineering (Archiv für Elektrotechnik), Springer Berlin / Heidelberg, Vol. 89, No. 2, pp. 127-136. [article2.pdf] © 2006 by authors and © 2006 Springer Science+Business Media. By permission.
dc.relation.haspart Burakov, A., Arkkio, A. 2006. Low-order parametric force model for eccentric-rotor electrical machine with parallel connections in stator winding. IEE Proceedings - Electric Power Applications, Vol. 153, Issue 4, pp. 592-600. [article3.pdf] © 2006 The Institution of Engineering and Technology (IET). By permission.
dc.relation.haspart Burakov, A., Arkkio, A. 2006. Validity of numerical impulse response test in studying unbalanced magnetic pull in electrical machines with parallel stator windings. Proceedings of the 17th International Conference on Electrical Machines (ICEM 2006), September 2-5, 2006, Chania, Crete Island, Greece, 5 p.
dc.relation.haspart Burakov, A., Arkkio, A. 2007. Low-order parametric force model for eccentric-rotor electrical machine equipped with parallel stator windings and rotor cage. IET Electric Power Applications, Vol. 1, Issue 4, pp. 532-542. [article5.pdf] © 2007 The Institution of Engineering and Technology (IET). By permission.
dc.relation.haspart Burakov, A., Arkkio, A. 2007. Mitigation of UMP components by the parallel stator windings in eccentric-rotor electrical machines. Proceedings of the 2007 IEEE International Electric Machines and Drives Conference (IEMDC 2007), May 3-5, 2007, Antalya, Turkey, pp. 1638-1642.
dc.relation.haspart Burakov, A., Arkkio, A. 2007. Comparison of the unbalanced magnetic pull mitigation by the parallel paths in the stator and rotor windings. IEEE Transactions on Magnetics, in press. [article7.pdf] © 2007 by authors and © 2007 IEEE. By permission.
dc.subject.other Electrical engineering en
dc.title Modelling the unbalanced magnetic pull in eccentric-rotor electrical machines with parallel windings en
dc.type G5 Artikkeliväitöskirja fi
dc.description.version reviewed en
dc.contributor.department Department of Electrical and Communications Engineering en
dc.contributor.department Sähkö- ja tietoliikennetekniikan osasto fi
dc.subject.keyword parallel windings en
dc.subject.keyword rotor eccentricity en
dc.subject.keyword unbalanced magnetic pull en
dc.identifier.urn urn:nbn:fi:tkk-010556
dc.type.dcmitype text en
dc.type.ontasot Väitöskirja (artikkeli) fi
dc.type.ontasot Doctoral dissertation (article-based) en
dc.contributor.lab Laboratory of Electromechanics en
dc.contributor.lab Sähkömekaniikan laboratorio fi


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