Electrothermal design exploration of electric machines using hollow conductors
Bajaj, Parag
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Permalink
https://hdl.handle.net/2142/124724
Description
Title
Electrothermal design exploration of electric machines using hollow conductors
Author(s)
Bajaj, Parag
Issue Date
2024-05-03
Director of Research (if dissertation) or Advisor (if thesis)
Haran, Kiruba
Department of Study
Electrical & Computer Eng
Discipline
Electrical & Computer Engr
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
M.S.
Degree Level
Thesis
Keyword(s)
Hollow Conductors
Electro-thermal Design
Thermal Management Systems
Language
eng
Abstract
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.
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