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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Die optimering van die ontwerp en die elektroniese kommutasie van 'n histeresemasjien vir hoë rotasiesnelhede

Bothma, Paul Ronald 10 June 2014 (has links)
M.Ing. (Electrical & Electronic Engineering Science) / This dissertation deals with the design and implementation of a hysteresis machine for high-speed applications. A model is introduced whereby the optimum working point of the machine can be determined. Hence it is possible to make a comparison between different rotor materials with respect to cost, specific energies and overall performance. The development of a compensator for actively controlling the phase angle of the airgap flux density, in order to reduce hunting, is discussed with reference to practical results. A technique for measuring real power in the frequency plane with the aid of a frequency spectrum analyzer, is explained. The design and evaluation of a hysteresis machine is based on practical results obtained from this measuring technique.
2

Digital modelling for performance prediction of hysteresis motors /

Gowda, Sidde Deve, January 1979 (has links)
Thesis (M.Eng.) -- Memorial University of Newfoundland. / Bibliography : leaves 89-91. Also available online.
3

A three-phase hybrid dc-ac inverter system utilizing hysteresis control

White, Terence H. 06 1900 (has links)
Approved for public release; distribution is unlimited / The naval vessels of the future will require lighter, more compact, and more versatile power electronics systems. With the advent of the DC Zonal Electrical Distribution System, more innovative approaches to the conversion of the dc bus power to ac power for motor drives will enhance the efficiency and warfighting capability of tomorrow's ships. This thesis explores the concept of a hybrid dc-ac power converter that combines a hysteresis controlled inverter with a six-step bulk inverter. A six-step bulk inverter is built from discrete components and tested in simulation and hardware. The two inverters are connected in parallel to provide a high-fidelity current source for a three-phase load. The addition of the hysteresis inverter to the bulk inverter adds a closed current loop for more robust control and improves the quality of the output load current. / Major, United States Marine Corps
4

A three-phase hybrid dc-ac inverter system utilizing hysteresis control /

White, Terence H. January 2004 (has links) (PDF)
Thesis (M.S. in Electrical Engineering)--Naval Postgraduate School, June 2004. / Thesis advisor(s): Robert Ashton. Includes bibliographical references (p. 73-74). Also available online.

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