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研究生： 施力文
Shih, Li-Wen
論文名稱： 藉由主動式磁浮軸承對銑切主軸之非線性控制
Nonlinear Spindle Control for Milling Process by Using Active Magnetic Bearings
指導教授： 蔡南全
Tsai, Nan-Chyuan
學位類別： 碩士
Master
系所名稱： 工學院 - 機械工程學系
Department of Mechanical Engineering
論文出版年： 2008
畢業學年度： 96
語文別： 中文
論文頁數： 110
中文關鍵詞： 磁浮軸承 、銑切 、模糊理論
外文關鍵詞： Active Magnetic Bearing, Fuzzy Logic Algorithm, Cutting Process
相關次數： 點閱：82  下載：1 
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    • 本文旨在建立主軸銑切系統於不同切削條件下之部分動態參數，並整合磁浮軸承技術、模糊理論及非線性控制器，節制主軸因切削工件時切削力作用所產生的偏擺。 本研究將主動式磁浮軸承運用於銑切系統上，建立磁力數學模型為一電流及氣隙的非整數階雙變數之非線性函數，利用反運算反推磁浮系統所需提供的電流大小，以得到與切削力相同大小的抗衡磁吸力作為主軸偏移的補償。 由於機台在不同的切削條件下擁有不同的系統動態，本文透過實驗法建立銑切系統於不同切削條件下之部分動態，配合模糊理論給予不同之權重分配，找出與銑切當下最接近之動態參數以估測切削力大小，並利用自調式增益演算法，改變估測切削力大小。 由電腦模擬之結果，可見其具有良好的抑制效能，工件之加工精度亦能大幅提升。

    The main goal of this research is to regulate the spindle deviation under different milling conditions by using Active Magnetic Bearing(AMB) technology, fuzzy logic algorithm and nonlinear adaptive control loop. Since the dynamics of milling system is highly dominated by system parameters, such as speed of spindle and feedrate, therefore the system dynamic model is more appropriate to be established by experiments instead of using theoretical analysis. The experimental data are utilized to estimate system parameters under various milling conditions before the fuzzy logic algorithm and the estimated cutting force are developed. Once the cutting force can be estimated, a compensation force is to be provided by the AMB to regulate spindle deviation. Since the magnetic force is highly nonlinear, the characteristic of AMB is investigated by experiments and a nonlinear mathematical model, in terms of air gap between spindle and magnetic pole and coil current, is established. Based on the model of magnetic attraction force, the controller is expected to evaluate the quantity of magnetic force to counter balance the cutting force precisely. The simulation results exhibit the efficacy of spindle deviation regulation as that the surface quality of workpieces after milling process can be improved.

    中文摘要………………………………………………………………….I 英文摘要………………………………………………………………... II 致謝……………………………………………………………………..III 目錄……………………………………………………………………..IV 表目錄………………………………………………………………….VII 圖目錄…………………………………………………………………. IX 第一章 緒論...........................................1 1.1 研究動機............................................1 1.2 主動式磁浮軸承與高速銑切簡介........................2 1.3 文獻回顧............................................4 1.4 論文貢獻............................................7 1.5 論文架構............................................8 第二章 主動式磁浮軸承系統特性分析.......................9 2.1 AMB架構與實驗配置..................................10 2.2 磁力特性曲線建立...................................16 2.2.1 磁力量測結果與特性曲線建立...................17 2.2.2 磁極特性分析.....................................22 2.3 磁力非線性近似法...................................26 2.3.1 電磁力與電流關係.............................27 2.3.2 電磁力與氣隙關係.............................30 2.3.3 磁力雙變數表示法.............................31 第三章 銑切主軸動態分析................................35 3.1 主軸動態特性分析...................................36 3.1.1 實驗配置與規劃...............................37 3.1.2 銑切主軸建模.................................41 3.2 銑切動態特性分析...................................49 3.2.1 實驗配置與規劃...............................51 3.2.2 銑切動態建模.................................56 第四章 切削力補償之非線性控制..........................74 4.1 切削力補償機制.....................................74 4.2 模糊模型(Fuzzy Model).............................75 4.2.1 模糊理論.....................................76 4.2.2 模糊主軸系統之設計...........................81 4.2.3 模糊銑切主軸系統之設計.......................82 4.3 閉迴路系統模擬與分析...............................86 4.3.1 自調式適應增益演算法.........................91 4.4 結論...............................................97 第五章 結論與未來展望..................................98 5.1 結論...............................................98 5.2 未來發展與建議.....................................99 參考文獻..............................................101 附錄A.................................................104 附錄B.................................................105 自述..................................................110

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