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研究生:尹道泓
研究生(外文):Dao-hong Yin
論文名稱:三相無刷直流風扇電動機之無轉軸偵測元件驅動系統的研製
論文名稱(外文):Implementation of a Sensorless Drive System for Three-Phase Brushless DC Fan Motors
指導教授:劉添華
指導教授(外文):Tian-hua Liu
學位類別:碩士
校院名稱:國立臺灣科技大學
系所名稱:電機工程系
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2008
畢業學年度:96
語文別:中文
論文頁數:104
中文關鍵詞:無轉軸偵側元件驅動風扇電動機數位信號處理器
外文關鍵詞:sensorless drivefan motorsdigital signal processor
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本論文旨在探討三相無刷直流風扇電動機之無轉軸偵測元件驅動系統的研製。文中,首先探討以脈波寬度調變控制與電壓控制,應用於三相無刷直流風扇電動機的速度控制。此外,利用相角調整方式與150度12步方波驅動方法,以提高電動機的轉速,並加入軟啟動與軟切換技術,改善電流脈動。
其次,本文提出一種轉軸角度估測器,藉由偵測反電動勢,獲得三相無刷直流風扇電動機的轉軸角度。文中使用量測端電壓當回授訊號,不需用到中性點,由端電壓與二分之ㄧ的直流匯流排電壓作比較,判斷反電動勢零點,以獲得電動機的換相點。
本文所研製之系統以數位信號處理器TMS320F2407為控制核心,用來處理零交越點訊號與產生開關驅動訊號。最後以實驗結果驗證其可行性與正確性。
This thesis proposes an implementation of a sensorless drive system for three-phase brushless DC fan motors. First, the pulse width modulation control method and the voltage control method are used in the speed control for a three-phase brushless DC fan motor. Next, by using the phase-adjustment method and the 150 degree driving method, the adjustable speed range can be extended. The soft-start technique and soft-switching technique are applied to improve the current pulsations.
After that, a rotor position estimator is proposed. By detecting the back emf, a rotor position of the motor can be obtained. The three-phase terminal voltages are measured and compared with a reference voltage, and then determine the zero crossing of the back emf. Then, the phase-commutation time can be determined from the zero crossing of the back emf.
A digital signal processor, TMS320LF2407, is used as the control center to process the zero crossing signals and to generate the driving signals of the power switches. Finally, some experimental results can validate the feasibility and correctness of the proposed method.
中文摘要 I
英文摘要 II
誌謝 III
目錄 IV
圖目錄 VII
表目錄 XI
符號說明 XII
第一章 緒論 1
1.1 研究動機與目的 1
1.2 文獻回顧 3
1.3 大綱 6
第二章 無刷直流電動機介紹 7
2.1 簡介 7
2.2 結構及特性 8
2.3 驅動原理 13
2.4 數學模式 20
第三章 無刷直流電動機驅動系統 24
3.1 簡介 24
3.2 變頻器原理 25
3.3 脈波寬度調變原理 29
3.4 相角調整方式 31
第四章 無轉軸偵測元件之閉迴路驅動系統 36
4.1 簡介 36
4.2 基本原理 38
4.3 驅動方式 41
4.4 轉速估測與換相方法 43
4.5 反電動勢零點偵測器 45
4.6 靜止啟動方法 47
4.7 閉迴路控速系統 49
4.7.1 脈波寬度調變配合比例-積分控制 49
4.7.2 電壓控制 51
4.8 重新啟動機制 53
4.9 軟啟動與軟切換技術探討 54
第五章 系統研製 56
5.1 簡介 56
5.2 硬體製作 58
5.2.1 主電路 58
5.2.2 驅動級電路 59
5.2.3 反電動勢零點偵測電路 61
5.3 軟體設計 62
5.3.1 簡介 62
5.3.2 數位信號處理器架構 63
5.3.3 軟體程式設計 68
第六章 實測 76
6.1 簡介 76
6.2 實測結果 76
第七章 結論及建議 96
參考文獻 97
作者簡介 104
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