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The application of thyristors to induction motor drive systems

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dc.contributor.authorKonrad, Charles Edwarden
dc.contributor.committeechairHopkins, M. H. Jr.en
dc.contributor.committeechairBennett, A. Wayneen
dc.contributor.committeememberPowley, G. R.en
dc.contributor.departmentElectrical Engineeringen
dc.date.accessioned2014-03-14T21:30:00Zen
dc.date.adate2010-02-17en
dc.date.available2014-03-14T21:30:00Zen
dc.date.issued1967-05-22en
dc.date.rdate2010-02-17en
dc.date.sdate2010-02-17en
dc.description.abstractThis thesis provides a comparison of three different power circuit arrangements of thyristors for controlling the speed of an induction motor through control of the stator voltage. The output voltage harmonic structure is provided for each circuit along with a comparison of the motor torque-speed characteristics. Means for coping with the motor heating problem, which results from adjustable voltage control, are discussed and curves are provided to evaluate the additional heating which results from the non-sinusoidal stator voltage. The principles of phase control are developed for single phase circuits and expressions are developed for calculating the input power factor which can be less than unity, even when the load is a resistance. These principles are then extended to three phase circuits where expressions for determining the phase sequence of the harmonics are developed. The applicability of superposition to the qualitative analysis of the effect of stator voltage harmonics upon motor performance is demonstrated, and the problems encountered in the quantitative application of superposition is discussed.en
dc.description.degreeMaster of Scienceen
dc.format.extent92 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-02172010-020038en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-02172010-020038/en
dc.identifier.urihttp://hdl.handle.net/10919/41223en
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V855_1967.K62.pdfen
dc.relation.isformatofOCLC# 20515488en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.lccLD5655.V855 1967.K62en
dc.subject.lcshElectric motors, Inductionen
dc.subject.lcshThyristorsen
dc.titleThe application of thyristors to induction motor drive systemsen
dc.typeThesisen
dc.type.dcmitypeTexten
thesis.degree.disciplineElectrical Engineeringen
thesis.degree.grantorVirginia Polytechnic Instituteen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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