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

Simple item page
dc.contributor.advisorEnslin, NC de Ven_ZA
dc.contributor.advisorBesseling, Johann L Nen_ZA
dc.contributor.authorCase, Michael Jamesen_ZA
dc.date.accessioned2015-03-04T18:55:24Z
dc.date.available2015-03-04T18:55:24Z
dc.date.issued1980en_ZA
dc.descriptionIncludes bibliographical references.en_ZA
dc.description.abstractThe 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.identifier.apacitationCase, M. J. (1980). <i>A direct A.C. to A.C. regenerative frequency and voltage converter</i>. (Thesis). University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Electrical Engineering. Retrieved from http://hdl.handle.net/11427/12558en_ZA
dc.identifier.chicagocitationCase, Michael James. <i>"A direct A.C. to A.C. regenerative frequency and voltage converter."</i> Thesis., University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Electrical Engineering, 1980. http://hdl.handle.net/11427/12558en_ZA
dc.identifier.citationCase, M. 1980. A direct A.C. to A.C. regenerative frequency and voltage converter. University of Cape Town.en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Case, Michael James AB - 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. DA - 1980 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 1980 T1 - A direct A.C. to A.C. regenerative frequency and voltage converter TI - A direct A.C. to A.C. regenerative frequency and voltage converter UR - http://hdl.handle.net/11427/12558 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/12558
dc.identifier.vancouvercitationCase MJ. A direct A.C. to A.C. regenerative frequency and voltage converter. [Thesis]. University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Electrical Engineering, 1980 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/12558en_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.titleA direct A.C. to A.C. regenerative frequency and voltage converteren_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
Files
Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
thesis_ebe_1980_case_mj.pdf
Size:
3.99 MB
Format:
Adobe Portable Document Format
Description:
Download
Collections
PhD / Doctoral