{"id":{"repo_id":"cape-town","oai_identifier":"oai:open.uct.ac.za:11427/9473"},"canonical_url":"https://search.dev.ndltd.org/etd/cape-town/oai:open.uct.ac.za:11427/9473","repository":{"repo_id":"cape-town","name":"University of Cape Town","base_url":"https://open.uct.ac.za/oai/request"},"display":{"title":"Analysis of an energy efficient permanent magnet brushless universal motor","abstract":"The vast improvements made in the development of rare earth magnets, power electronics and micro-electronics over the last two decades can claim to be the major driving forces behind the rapid growth of permanent magnet (PM) brushless motor drives. The state of the art in PM motor technology is the PM universal motor, i.e. a combination of a PM synchronous and a PM brushless direct current (DC) motor. The PM universal motor has the capability to operate as a variable speed DC shunt motor with high torque at low speeds, and also as a synchronous motor at constant speed with high efficiency. The literature on synchronous and PM brushless motors is very extensive, although no studies have dealt with the concept of a PM brushless universal motor in any detail. The objective of this thesis is to develop an energy efficient, high performance, reliable and inexpensive electrical motor to replace induction motors, in the 21st century. Initial research of different AC motors highlighted the importance of correctly designing electrical motors. The different PM synchronous motors used in this study revealed that a sound knowledge of the motor's performance characteristics, at the design stage, is crucial to the successful and optimal design of any PM motor.","abstract_html":"The vast improvements made in the development of rare earth magnets, power electronics and micro-electronics over the last two decades can claim to be the major driving forces behind the rapid growth of permanent magnet (PM) brushless motor drives. The state of the art in PM motor technology is the PM universal motor, i.e. a combination of a PM synchronous and a PM brushless direct current (DC) motor. The PM universal motor has the capability to operate as a variable speed DC shunt motor with high torque at low speeds, and also as a synchronous motor at constant speed with high efficiency. The literature on synchronous and PM brushless motors is very extensive, although no studies have dealt with the concept of a PM brushless universal motor in any detail. The objective of this thesis is to develop an energy efficient, high performance, reliable and inexpensive electrical motor to replace induction motors, in the 21st century. Initial research of different AC motors highlighted the importance of correctly designing electrical motors. The different PM synchronous motors used in this study revealed that a sound knowledge of the motor's performance characteristics, at the design stage, is crucial to the successful and optimal design of any PM motor.","abstract_has_math":false,"creators":["Wing, Mitchell, 1968-"],"institution":"Department of Electrical Engineering","degree_name":null,"degree_level":null,"degree_discipline":null,"degree_department":null,"school":null,"contributors":[],"advisors":["Gieras, Jacek F"],"committee_chairs":[],"committee_members":[],"year":1996,"date_issued":"1996","date_published":"1996","updated_at":"2026-07-22T22:23:23Z","subjects":[],"languages":["eng"],"rights":[],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/11427/9473","outbound_label":"Handle","outbound_source":"dc:identifier.uri"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.advisor","label":"Advisor","values":["Gieras, Jacek F"]},{"key":"dc:creator","label":"Author","values":["Wing, Mitchell, 1968-"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.accessioned","label":"Dc Date Accessioned","values":["2014-11-10T08:54:55Z"]},{"key":"dc:date.available","label":"Dc Date Available","values":["2014-11-10T08:54:55Z"]},{"key":"dc:date.issued","label":"Date","values":["1996"]},{"key":"dc:publisher.department","label":"Dc Publisher Department","values":["Department of Electrical Engineering"]},{"key":"dc:publisher.institution","label":"Dc Publisher Institution","values":["University of Cape Town"]},{"key":"dc:type","label":"Dc Type","values":["Doctoral Thesis"]},{"key":"dc:type.qualificationlevel","label":"Dc Type Qualificationlevel","values":["Doctoral"]},{"key":"dc:type.qualificationname","label":"Dc Type Qualificationname","values":["PhD"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language.iso","label":"Language (ISO)","values":["eng"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.uri","label":"Identifier URI","values":["http://hdl.handle.net/11427/9473"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Bibliography: leaves 131-138."]},{"key":"dc:description.abstract","label":"Abstract","values":["The vast improvements made in the development of rare earth magnets, power electronics and micro-electronics over the last two decades can claim to be the major driving forces behind the rapid growth of permanent magnet (PM) brushless motor drives. The state of the art in PM motor technology is the PM universal motor, i.e. a combination of a PM synchronous and a PM brushless direct current (DC) motor. The PM universal motor has the capability to operate as a variable speed DC shunt motor with high torque at low speeds, and also as a synchronous motor at constant speed with high efficiency. The literature on synchronous and PM brushless motors is very extensive, although no studies have dealt with the concept of a PM brushless universal motor in any detail. The objective of this thesis is to develop an energy efficient, high performance, reliable and inexpensive electrical motor to replace induction motors, in the 21st century. Initial research of different AC motors highlighted the importance of correctly designing electrical motors. The different PM synchronous motors used in this study revealed that a sound knowledge of the motor's performance characteristics, at the design stage, is crucial to the successful and optimal design of any PM motor."]},{"key":"dc:title","label":"Title","values":["Analysis of an energy efficient permanent magnet brushless universal motor"]}]}],"canonical_facts":{"dc:contributor.advisor":["Gieras, Jacek F"],"dc:creator":["Wing, Mitchell, 1968-"],"dc:date.accessioned":["2014-11-10T08:54:55Z"],"dc:date.available":["2014-11-10T08:54:55Z"],"dc:date.issued":["1996"],"dc:description":["Bibliography: leaves 131-138."],"dc:description.abstract":["The vast improvements made in the development of rare earth magnets, power electronics and micro-electronics over the last two decades can claim to be the major driving forces behind the rapid growth of permanent magnet (PM) brushless motor drives. The state of the art in PM motor technology is the PM universal motor, i.e. a combination of a PM synchronous and a PM brushless direct current (DC) motor. The PM universal motor has the capability to operate as a variable speed DC shunt motor with high torque at low speeds, and also as a synchronous motor at constant speed with high efficiency. The literature on synchronous and PM brushless motors is very extensive, although no studies have dealt with the concept of a PM brushless universal motor in any detail. The objective of this thesis is to develop an energy efficient, high performance, reliable and inexpensive electrical motor to replace induction motors, in the 21st century. Initial research of different AC motors highlighted the importance of correctly designing electrical motors. The different PM synchronous motors used in this study revealed that a sound knowledge of the motor's performance characteristics, at the design stage, is crucial to the successful and optimal design of any PM motor."],"dc:identifier.uri":["http://hdl.handle.net/11427/9473"],"dc:language.iso":["eng"],"dc:publisher.department":["Department of Electrical Engineering"],"dc:publisher.institution":["University of Cape Town"],"dc:title":["Analysis of an energy efficient permanent magnet brushless universal motor"],"dc:type":["Doctoral Thesis"],"dc:type.qualificationlevel":["Doctoral"],"dc:type.qualificationname":["PhD"]},"updated_at":"2026-07-22T22:23:23Z"}