A coupled thermal-magnetic finite element model for high frequency transformers

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dc.contributor.authorJessee, J. Patricken
dc.contributor.committeechairNelson, Douglas J.en
dc.contributor.committeememberVick, Brian L.en
dc.contributor.committeememberThomas, James R. Jr.en
dc.contributor.departmentMechanical Engineeringen
dc.date.accessioned2014-03-14T21:51:55Zen
dc.date.adate2008-12-17en
dc.date.available2014-03-14T21:51:55Zen
dc.date.issued1990-12-20en
dc.date.rdate2008-12-17en
dc.date.sdate2008-12-17en
dc.description.abstractA new method for analyzing axisymmetric, high-frequency transformers is presented. The method is based on the simultaneous solution of the coupled, nonlinear thermal and electromagnetic equations using the finite element method. A novel technique for modeling the reluctivity of the soft-ferrite core material permits a time-harmonic transformation of the electromagnetic equations. This eliminates the need to step through time while maintaining the effects of hysteresis losses. Also, a quasi-steady formulation of the heat-conduction equation eliminates the time dependency on the thermal problem. A direct substitution iterative scheme is used in conjunction with the finite element method to compensate for the coupled and nonlinear nature of the equations. To verify the magnetics portion of the finite element code numerically, a linear, uncoupled test case is given which compares the magnetic results from the present method to those from a commercial software package. To investigate the accuracy of the fully coupled and nonlinear model, an example is presented which compares the results from the numerical analysis of an inductor to those obtained by experimental measurement.en
dc.description.degreeMaster of Scienceen
dc.format.extentxii, 149 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-12172008-063409en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-12172008-063409/en
dc.identifier.urihttp://hdl.handle.net/10919/46291en
dc.language.isoenen
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V855_1990.J477.pdfen
dc.relation.isformatofOCLC# 23604955en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.lccLD5655.V855 1990.J477en
dc.subject.lcshElectric transformersen
dc.titleA coupled thermal-magnetic finite element model for high frequency transformersen
dc.typeThesisen
dc.type.dcmitypeTexten
thesis.degree.disciplineMechanical Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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