2026-09-23T10:34:56Z https://www.ideals.illinois.edu/oai-pmh

oai:www.ideals.illinois.edu:2142/124724 2026-01-14 col_2142_5131 col_2142_8888 com_2142_5130 com_2142_8887 com_2142_234

Haran, Kiruba 2024-05 application/pdf en text Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2026-05-01 The student, Parag Bajaj, accepted the attached license on 2024-05-02 at 09:25. The student, Parag Bajaj, submitted this Thesis for approval on 2024-05-02 at 09:30. This Thesis was approved for publication on 2024-05-03 at 15:42. DSpace SAF Submission Ingestion Package generated from Vireo submission #20754 on 2024-09-16 at 00:51:13 Thermal Management Systems This thesis presents preliminary electromagnetic and thermal considerations for hollow conductors filled with coolants to be used as new-age winding alternatives for mega-watt class power-dense electric machines for the next generation of electrified aircraft. First, a Double Layer Fractional Slot Concentrated Wound machine is designed as a baseline motor, due to its advantages presented in the reduction of the end-winding losses. Next, to study the impact of the hollow conductors and quantify the increase in power density, an updated machine is designed, within the same motor housing. To demonstrate the cooling capabilities of the hollow conductors, thermal analysis is performed on both the machine models and the reduction in operating temperature is quantified. This thesis first introduces the operational principle of concentrated fractional slot wound machines. Then, the design process of the two machine models is explored, including a parameterized machine model that aids in easily viewing geometry followed by in-depth finite element analysis. Next, modeling strategies of the hollow conductors and their impact on the thermal analysis are introduced. This is followed by revising the electromagnetic models of the winding to obtain accurate ohmic loss models of the windings, which are fed into the thermal winding models to predict the temperature rise in the winding hotspot region. Finally, the rise in temperature of the windings and the increase in power density from employing hollow conductors is classified. Text eng https://hdl.handle.net/2142/124724 Copyright 2024 Parag Bajaj Electrothermal design exploration of electric machines using hollow conductors Bajaj, Parag 2024-05-03 Hollow Conductors Electro-thermal Design M.S. Thesis Electrical & Computer Engr University of Illinois at Urbana-Champaign Electrical & Computer Eng