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論文
【年度】99
年研發成果
【項目】
論文
【領域】
關鍵技術科專
【類別】
機電運輸
| 計畫名稱 | 下世代儲電元件與系統技術開發計畫 | | 論文名稱 | 磁浮軸承對轉子之磁效應分析 | | 論文類型 | SCI期刊 | | 發表處 | Proceedings of the Institution of Mechanical Engineers Part C - Journal of Mechanical Engineers Science | | 發表人 | Nan-Chyuan Tsai,Heng-Yi Li,Chih-Che Lin,Pai-Lu Wang | | 發表日期 | 99/12/10 | | 國家 | 國外 | | 內容摘要 | The purpose of this paper is to apply the Wavelet Transform algorithm to identify the magnetic damping and magnetic stiffness coefficients of the drive rod with which a set of 4-pole Active Magnetic Bearing (AMB) is equipped. By taking advantage of time-frequency analysis feature, the ridge curve of rod free response after Wavelet transformation can be extracted to find the natural frequency of the rod/AMB system. In other words, due to the influence of magnetized field by AMB, the stiffness of the rod dynamics is not linear any more and can be estimated from the curve of the amplitude versus frequency by Wavelet transformation. On the other hand, the nonlinear damping coefficients can be estimated from the derivative of amplitude versus amplitude by Wavelet transformation of rod free vibration. It is found that the nonlinear magnetic damping coefficients are up to 2nd-order in polynomial and the stiffness coefficient is mainly of 3rd-order respectively. In addition, the identified 2nd-order damping coefficient is negative and hence implies that under specific rod displacement and speed, the dynamic of rod/AMB system in axial direction is unstable. |
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