Direct digital control of a D.C. machine

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dc.contributor.advisorMcLaren, S Gen_ZA
dc.contributor.authorWeehuizen, Hermanis Fransen_ZA
dc.date.accessioned2016-03-14T07:02:25Z
dc.date.available2016-03-14T07:02:25Z
dc.date.issued1972en_ZA
dc.description.abstractThe object of this thesis is to build an interface between a computor and a three phase thyristor bridge rectifier, enabling the computor to control its D.C. output voltage. By writing a suitable computor program, this system was extended to provide closed loop computor control of the speed of a D.C. machine. The first interface and computor program were so designed that the computer provided the required analogue triggering delay for voltage control of the D.C. output. This setup did not allow for infinite variation of the voltage and occupied a large portion of the computor time. Thus it was decided to modify the interface, letting it provide its own delay, thus freeing the computor of the delay routine and giving it more time to do other tasks. Control of the bridge rectifier was also improved. When closed loop control was implemented, the system was found to be unstable. It was thus simulated and stabilized on the analogue computor. A new digital computor program was written incorporating those characteristics which were found necessary in the simulation to make the system stable. The modified form of compensation was found to give a satisfactory performance for both step and ramp inputs to the system as well as load transients on the D.C. motor. Various types of tachogenerator were tested to find which was the most suitable for operation with the computer. All the types tested gave satisfactory performances. The major factor affecting performance was the quality of the tachogenerator.en_ZA
dc.identifier.apacitationWeehuizen, H. F. (1972). <i>Direct digital control of a D.C. machine</i>. (Thesis). University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Electrical Engineering. Retrieved from http://hdl.handle.net/11427/17670en_ZA
dc.identifier.chicagocitationWeehuizen, Hermanis Frans. <i>"Direct digital control of a D.C. machine."</i> Thesis., University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Electrical Engineering, 1972. http://hdl.handle.net/11427/17670en_ZA
dc.identifier.citationWeehuizen, H. 1972. Direct digital control of a D.C. machine. University of Cape Town.en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Weehuizen, Hermanis Frans AB - The object of this thesis is to build an interface between a computor and a three phase thyristor bridge rectifier, enabling the computor to control its D.C. output voltage. By writing a suitable computor program, this system was extended to provide closed loop computor control of the speed of a D.C. machine. The first interface and computor program were so designed that the computer provided the required analogue triggering delay for voltage control of the D.C. output. This setup did not allow for infinite variation of the voltage and occupied a large portion of the computor time. Thus it was decided to modify the interface, letting it provide its own delay, thus freeing the computor of the delay routine and giving it more time to do other tasks. Control of the bridge rectifier was also improved. When closed loop control was implemented, the system was found to be unstable. It was thus simulated and stabilized on the analogue computor. A new digital computor program was written incorporating those characteristics which were found necessary in the simulation to make the system stable. The modified form of compensation was found to give a satisfactory performance for both step and ramp inputs to the system as well as load transients on the D.C. motor. Various types of tachogenerator were tested to find which was the most suitable for operation with the computer. All the types tested gave satisfactory performances. The major factor affecting performance was the quality of the tachogenerator. DA - 1972 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 1972 T1 - Direct digital control of a D.C. machine TI - Direct digital control of a D.C. machine UR - http://hdl.handle.net/11427/17670 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/17670
dc.identifier.vancouvercitationWeehuizen HF. Direct digital control of a D.C. machine. [Thesis]. University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Electrical Engineering, 1972 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/17670en_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.subject.otherElectronic digital computersen_ZA
dc.titleDirect digital control of a D.C. machineen_ZA
dc.typeMaster Thesis
dc.type.qualificationlevelMasters
dc.type.qualificationnameMSc (Eng)en_ZA
uct.type.filetypeText
uct.type.filetypeImage
uct.type.publicationResearchen_ZA
uct.type.resourceThesisen_ZA
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