Superconducting rotor with high thermal-resistance torque transfer mechanism
Xiao, Jianqiao
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Permalink
https://hdl.handle.net/2142/114102
Description
Title
Superconducting rotor with high thermal-resistance torque transfer mechanism
Author(s)
Xiao, Jianqiao
Issue Date
2021-12-06
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)
superconducting
heat transfer
Abstract
This thesis proposes a superconducting rotor design with a low thermal-conduction torque transfer mechanism that allows the machine to be cooled by one compact cryocooler instead of more bulky methods and thus increases the specific power. The thesis first discusses the limitation on the current density and the iron core of a conventional machine and how superconducting machines may expand these limitations. Then the liquid and cryocooler cooling methods and their challenges for maintaining the cryogenic environment are presented. A superconducting (SC) rotor with a spoke suspension structure is then proposed with a detailed description of its mechanical structure and thermal considerations. Analytical equations are also derived to size the spokes and estimate the cooling requirements. A finite element analysis (FEA) is conducted based on a 3.5 MW, 4,500 rpm SC rotor using the spoke suspension system. A dynamic model is also developed for future analysis on the rotor dynamics which has been changed from previous designs because of the more flexible spoke connections.
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