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A direct A.C. to A.C. regenerative frequency and voltage converter
Includes bibliographical references.
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| Main Author: | |
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| Other Authors: | |
| Format: | Thesis |
| Language: | English |
| Published: |
Department of Electrical Engineering
2015
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| _version_ | 1867613585171021825 |
|---|---|
| access_status_str | Open Access |
| author | Case, Michael James |
| author2 | Enslin, NC de V |
| author_browse | Case, Michael James Enslin, NC de V |
| author_facet | Enslin, NC de V Case, Michael James |
| author_sort | Case, Michael James |
| collection | Thesis |
| description | Includes bibliographical references. |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/12558 |
| institution | University of Cape Town (South Africa) |
| language | eng |
| last_indexed | 2026-06-10T12:38:29.149Z |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UCTD — University of Cape Town Open Access Repository |
| publishDate | 2015 |
| publishDateRange | 2015 |
| publishDateSort | 2015 |
| publisher | Department of Electrical Engineering |
| publisherStr | Department of Electrical Engineering |
| record_format | dspace |
| source_str | UCTD — University of Cape Town Open Access Repository |
| spelling | oai:open.uct.ac.za:11427/12558 A direct A.C. to A.C. regenerative frequency and voltage converter Case, Michael James Enslin, NC de V Besseling, Johann L N Electrical Engineering Includes bibliographical references. 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. 2015-03-04T18:55:24Z 2015-03-04T18:55:24Z 1980 Doctoral Thesis Doctoral PhD http://hdl.handle.net/11427/12558 eng application/pdf Department of Electrical Engineering Faculty of Engineering and the Built Environment University of Cape Town |
| spellingShingle | Electrical Engineering Case, Michael James A direct A.C. to A.C. regenerative frequency and voltage converter |
| thesis_degree_str | Doctoral |
| title | A direct A.C. to A.C. regenerative frequency and voltage converter |
| title_full | A direct A.C. to A.C. regenerative frequency and voltage converter |
| title_fullStr | A direct A.C. to A.C. regenerative frequency and voltage converter |
| title_full_unstemmed | A direct A.C. to A.C. regenerative frequency and voltage converter |
| title_short | A direct A.C. to A.C. regenerative frequency and voltage converter |
| title_sort | direct a c to a c regenerative frequency and voltage converter |
| topic | Electrical Engineering |
| url | http://hdl.handle.net/11427/12558 |
| work_keys_str_mv | AT casemichaeljames adirectactoacregenerativefrequencyandvoltageconverter AT casemichaeljames directactoacregenerativefrequencyandvoltageconverter |