Study of magnetic bearing instability for KAIST micro modular reactor application = 초소형 모듈원전의 자기베어링 적용을 위한 불안정성 연구

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A concept of micro nuclear reactor with supercritical $CO_2$ (S-$CO_2$) Brayton cycle namely KAIST Micro Modular Reactor (MMR) with 12MWe power output is being developed to serve as a distributed power source for remote region. In order to successfully develop MMR, issues of bearing capacity for shaft levitation have to be resolved. In order to support a shaft for 12MWe system the magnetic bearing is suggested to be suitable instead of gas foil bearing which has lower levitation force. However, several previous studies on the magnetic bearing showed that instability issues exist under high speed operating with high pressure fluid conditions. Therefore, controlling magnetic bearing instability becomes an important issue for the realization of MMR The purposes of this research is to analyze instability of the magnetic bearing under S-$CO_2$ condition and propose functional requirements of the magnetic bearing. The shaft with magnetic bearings and operating under high pressure fluid is analyzed. In addition, the analysis results can be used for predicting the instability. Based on the results, a magnetic bearing test rig is constructed. By comparing experimental data to the analysis results, the analysis model is verified.
Advisors
Lee, Jeong Ikresearcher이정익researcher
Description
한국과학기술원 :원자력및양자공학과,
Publisher
한국과학기술원
Issue Date
2019
Identifier
325007
Language
eng
Description

학위논문(석사) - 한국과학기술원 : 원자력및양자공학과, 2019.2,[vii, 78 p. :]

Keywords

Supercritical carbon dioxide Brayton cycle (S-CO2 Brayton cycle)▼aKAIST MMR▼amagnetic bearing▼ainstability; 초임계 이산화탄소 브레이튼 사이클▼aKAIST MMR▼a자기베어링▼a불안정성

URI
http://hdl.handle.net/10203/266559
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=843334&flag=dissertation
Appears in Collection
NE-Theses_Master(석사논문)
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