유체동압베어링이 적용된 통신중계기용 쿨링 팬모터의 회전자 부상에 따른 소음 저감 강건설계Robust design to reduce noise of a cooling fan motor with fluid dynamic bearings in telecommunication repeaters due to flying motion of a rotor
- Other Titles
- Robust design to reduce noise of a cooling fan motor with fluid dynamic bearings in telecommunication repeaters due to flying motion of a rotor
- Authors
- 문강훈; 이민호; 김교봉; 장건희
- Issue Date
- Dec-2018
- Publisher
- 대한기계학회
- Keywords
- cooling fan motor (쿨링 팬모터); fluid dynamic bearings (유체동압베어링); flying height (부상 높이); unbalanced magnetic force (비대칭 자기력)
- Citation
- 대한기계학회 2018년도 학술대회, pp.2131 - 2136
- Indexed
- OTHER
- Journal Title
- 대한기계학회 2018년도 학술대회
- Start Page
- 2131
- End Page
- 2136
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/15205
- Abstract
- We identified the noise source of the cooling fan motor with fluid dynamic bearings in telecommunication repeater due to flying height. Flying height of rotor was determined by the equilibrium equation of weight, thrust force, and unbalanced magnetic force. Thrust force and unbalanced magnetic force were calculated by using computational fluid dynamics (CFD) analysis and electromagnetic analysis, respectively. Analyzed flying height was verified by measuring the flying height of a rotor due to various mounting angles. We proposed the robust design that can prevent flying motion by adjusting the axial relative position between permanent magnet and stator in such a way that unbalanced magnetic force suppresses propulsive force of a rotating fan. We measured the flying height and overall noise of conventional and proposed models and we observed that the proposed model had lower noise than the conventional model.
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