{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/106291"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/106291","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Brushless doubly-fed reluctance machine drive for turbo-electric distributed propulsion systems","abstract":"Turbo-electric distributed propulsion systems are considered to be a critical enabler for low-carbon emission in the aircraft industry. A brushless doubly-fed reluctance machine (BDFRM) is an attractive option to drive the distributed propeller fans for these megawatt-scale turbo-electric propulsion systems due to use of a partially-rated power converter, reduced maintenance, and absence of permanent magnets. This thesis investigates the torque production in BDFRM, discusses machine modeling and drive control architecture, and reports on an initial sizing of a 1.5 MW motor. However, the BDFRM has inherently poor torque density because of machine saturation, even at low current-density, that offsets all the benefits. This thesis proposes an approach to maximize the torque density by finding appropriate electrical excitations on the two stator windings for a given machine dimension while remaining within flux- and current-density limits. A single-objective optimization problem is formulated. The obtained results prove that while designs with equal electrical loadings on both stators, and an initial current phase offset of pi/2 between the two stators, may seem a good design approach, they are far from optimal. Our optimized solution establishes that the phase offset of 2pi/3 provides maximum torque capability for an identical dimension. This procedure is validated using FEA simulations. Operating with this design also leads to higher machine efficiency and better power factor on the secondary stator, thus reducing the converter rating. Finally, the thesis concludes with a summary of findings and suggestions for future work in this field.","abstract_html":"Turbo-electric distributed propulsion systems are considered to be a critical enabler for low-carbon emission in the aircraft industry. A brushless doubly-fed reluctance machine (BDFRM) is an attractive option to drive the distributed propeller fans for these megawatt-scale turbo-electric propulsion systems due to use of a partially-rated power converter, reduced maintenance, and absence of permanent magnets. This thesis investigates the torque production in BDFRM, discusses machine modeling and drive control architecture, and reports on an initial sizing of a 1.5 MW motor. However, the BDFRM has inherently poor torque density because of machine saturation, even at low current-density, that offsets all the benefits. This thesis proposes an approach to maximize the torque density by finding appropriate electrical excitations on the two stator windings for a given machine dimension while remaining within flux- and current-density limits. A single-objective optimization problem is formulated. The obtained results prove that while designs with equal electrical loadings on both stators, and an initial current phase offset of pi/2 between the two stators, may seem a good design approach, they are far from optimal. Our optimized solution establishes that the phase offset of 2pi/3 provides maximum torque capability for an identical dimension. This procedure is validated using FEA simulations. Operating with this design also leads to higher machine efficiency and better power factor on the secondary stator, thus reducing the converter rating. Finally, the thesis concludes with a summary of findings and suggestions for future work in this field.","abstract_has_math":false,"creators":["Shivang, -"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"M.S.","degree_level":"Thesis","degree_discipline":"Electrical & Computer Engr","degree_department":null,"school":null,"contributors":["Banerjee, Arijit"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2020,"date_issued":"2020-03-02T22:03:28Z","date_published":"2020-03-02T22:03:28Z","updated_at":"2026-07-22T22:24:45Z","subjects":["Doubly fed, brushless, rotor modulation, switched drive, power converter, current rating, voltage rating."],"languages":["en"],"rights":["Copyright 2019 - Shivang"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/2142/106291","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Banerjee, Arijit"]},{"key":"dc:creator","label":"Author","values":["Shivang, -"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2020-03-02T22:03:28Z","2019-12-12","2019-12"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Electrical & Computer Engr"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Thesis"]},{"key":"thesis:degree_name","label":"Degree Name","values":["M.S."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Illinois at Urbana-Champaign"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Doubly fed, brushless, rotor modulation, switched drive, power converter, current rating, voltage rating."]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 2019 - Shivang"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/106291"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Turbo-electric distributed propulsion systems are considered to be a critical enabler for low-carbon emission in the aircraft industry. A brushless doubly-fed reluctance machine (BDFRM) is an attractive option to drive the distributed propeller fans for these megawatt-scale turbo-electric propulsion systems due to use of a partially-rated power converter, reduced maintenance, and absence of permanent magnets. This thesis investigates the torque production in BDFRM, discusses machine modeling and drive control architecture, and reports on an initial sizing of a 1.5 MW motor. However, the BDFRM has inherently poor torque density because of machine saturation, even at low current-density, that offsets all the benefits. This thesis proposes an approach to maximize the torque density by finding appropriate electrical excitations on the two stator windings for a given machine dimension while remaining within flux- and current-density limits. A single-objective optimization problem is formulated. The obtained results prove that while designs with equal electrical loadings on both stators, and an initial current phase offset of pi/2 between the two stators, may seem a good design approach, they are far from optimal. Our optimized solution establishes that the phase offset of 2pi/3 provides maximum torque capability for an identical dimension. This procedure is validated using FEA simulations. Operating with this design also leads to higher machine efficiency and better power factor on the secondary stator, thus reducing the converter rating. Finally, the thesis concludes with a summary of findings and suggestions for future work in this field.","Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2020-02-28 without embargo terms","The student, - Shivang, accepted the attached license on 2019-12-12 at 12:47.","The student, - Shivang, submitted this Thesis for approval on 2019-12-12 at 12:57.","This Thesis was approved for publication on 2019-12-12 at 13:22.","DSpace SAF Submission Ingestion Package generated from Vireo submission #14812 on 2020-02-28 at 17:16:58","Made available in DSpace on 2020-03-02T22:03:28Z (GMT). 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A brushless doubly-fed reluctance machine (BDFRM) is an attractive option to drive the distributed propeller fans for these megawatt-scale turbo-electric propulsion systems due to use of a partially-rated power converter, reduced maintenance, and absence of permanent magnets. This thesis investigates the torque production in BDFRM, discusses machine modeling and drive control architecture, and reports on an initial sizing of a 1.5 MW motor. However, the BDFRM has inherently poor torque density because of machine saturation, even at low current-density, that offsets all the benefits. This thesis proposes an approach to maximize the torque density by finding appropriate electrical excitations on the two stator windings for a given machine dimension while remaining within flux- and current-density limits. A single-objective optimization problem is formulated. The obtained results prove that while designs with equal electrical loadings on both stators, and an initial current phase offset of pi/2 between the two stators, may seem a good design approach, they are far from optimal. Our optimized solution establishes that the phase offset of 2pi/3 provides maximum torque capability for an identical dimension. This procedure is validated using FEA simulations. Operating with this design also leads to higher machine efficiency and better power factor on the secondary stator, thus reducing the converter rating. Finally, the thesis concludes with a summary of findings and suggestions for future work in this field.","Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2020-02-28 without embargo terms","The student, - Shivang, accepted the attached license on 2019-12-12 at 12:47.","The student, - Shivang, submitted this Thesis for approval on 2019-12-12 at 12:57.","This Thesis was approved for publication on 2019-12-12 at 13:22.","DSpace SAF Submission Ingestion Package generated from Vireo submission #14812 on 2020-02-28 at 17:16:58","Made available in DSpace on 2020-03-02T22:03:28Z (GMT). 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