A direct A.C. to A.C. regenerative frequency and voltage converter

 

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dc.contributor.advisor Enslin, NC de V en_ZA
dc.contributor.advisor Besseling, Johann L N en_ZA
dc.contributor.author Case, Michael James en_ZA
dc.date.accessioned 2015-03-04T18:55:24Z
dc.date.available 2015-03-04T18:55:24Z
dc.date.issued 1980 en_ZA
dc.identifier.citation Case, M. 1980. A direct A.C. to A.C. regenerative frequency and voltage converter. University of Cape Town. en_ZA
dc.identifier.uri http://hdl.handle.net/11427/12558
dc.description Includes bibliographical references. en_ZA
dc.description.abstract The reliable variable speed operation of an a. c. machine over a wide speed range is a problem that has received attention for some time. In this thesis a system to permit such operation from a fixed frequency fixed voltage supply is proposed, under the name of the asynchronous modulation converter. This converter is of the cycloconverter family, but is force-commutated and is not synchronised with the supply frequency. The power switching element comprises a power transistor in a diode bridge, coupled to the control circuitry by opto-isolators. The output of the a-mod converter is produced by a "chopper" modulation process and this results in the harmonics present being at frequencies well removed from the fundamental. A feedback system to ensure smooth commutation of the output current from the power switches is described. This feedback system operates by sensing the rate of rise of the inductive voltage surge on the load when a switch is opened to operate a freewheel path switch. en_ZA
dc.language.iso eng en_ZA
dc.subject.other Electrical Engineering en_ZA
dc.title A direct A.C. to A.C. regenerative frequency and voltage converter en_ZA
dc.type Thesis / Dissertation en_ZA
uct.type.publication Research en_ZA
uct.type.resource Thesis en_ZA
dc.publisher.institution University of Cape Town
dc.publisher.faculty Faculty of Engineering & the Built Environment en_ZA
dc.publisher.department Department of Electrical Engineering en_ZA
dc.type.qualificationlevel Doctoral en_ZA
dc.type.qualificationname PhD en_ZA
uct.type.filetype Text
uct.type.filetype Image


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