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改良式反電動勢偵測法之直流無刷馬達無感測控制 陳伯龍、陳盛基

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改良式反電動勢偵測法之直流無刷馬達無感測控制 陳伯龍、陳盛基

E-mail: 364908@mail.dyu.edu.tw

摘 要

本文主要以反電動勢偵測方式達到永磁直流無刷馬達(PMBLDCM)的無感測控制。控制核心採用Microchip公司所生產 之33FJ32MC204晶片,此晶片結合了類比與數位控制的特殊技術,並且擁有PWM模組,是整合直流無刷馬達無感測控制 及驅動功率模組設計的關鍵。在無感測控制方面,本文以反電動勢過零點法為基礎,偵測端電壓訊號與馬達中性點電壓比 較,並使用數位濾波器正確的判斷出反電動勢過零點位置,使PMBLDCM達到無感測換相控制。依啟動程序使馬達從靜止 以開迴路運轉,隨後將馬達轉速提高到足以偵測BEMF過零點訊號,即切換至無感測驅動模式。並透過使用六個PWM訊號 調變技術來達成轉速控制。由於本文完全不需要外加位置感測器,且使用數位濾波器來降低PMBLDCM製作成本,節省了 馬達驅動電路的體積,使PMBLDCM的運用範圍更為廣泛。

關鍵詞 : 永磁直流無刷馬達、反電動勢、無感測控制、脈衝寬度調變 目錄

封面內頁 簽名頁 中文摘要....................iii 英文摘要................

....iv 誌謝......................v 目錄.....................

.vi 圖目錄.....................viii 表目錄.....................xii 符號說明....................xiii 第一章 緒論 1.1 前言..................

.1 1.2 研究目的.................2 1.3 研究步驟.................3 1.4 內容大 綱.................4 1.5 本文特點與貢獻..............5 第二章 直流無刷馬達控 制原理 2.1 直流無刷馬達基本介紹...........6 2.2 直流無刷馬達數學模型...........7 2.3 直流 無刷馬達驅動方式...........11 2.4 六步方波控制驅動方式...........12 第三章 直流無刷馬 無感測控制文獻回顧 3.1 反電動勢過零點偵測法...........17 3.2 反電動勢第三諧波偵測法.......

...23 3.3 飛輪二極體導通法.............29 3.4 磁通觀測法................32 3.5 小節討論.................37 第四章 直流無刷馬無感測控制策略 4.1中性點電壓比較法簡述...

.........39 4.2系統架構..................41 4.3端電壓分析............

.....43 4.4低通濾波器.................45 4.5中性點電壓比較判斷邏輯..........

.46 4.6電壓脈波寬度調變..............52 4.7啟動原理..................55 4.8 控制迴路..................56 第五章 系統架構與實驗結果 5.1控制核心33FJ32MC204介紹...

......59 5.2控制板介紹.................61 5.3 DMCI控制數據狀態介面設置.......

..66 5.4程式流程..................71 5.5直流無刷馬達無感測控制實驗結果.......76 第 六章 結論..................98 參考文獻....................99 附錄A.

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參考文獻

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