臺灣博碩士論文加值系統

傳統吊扇使用單相感應電動機，利用電感或電容器分相調速，由於運轉時轉差極大造成運轉效率低。為能改善傳統吊扇感應電動機的運轉效率，新型變頻器效能在本文評估，同時探討單極性與雙極性波寬調變效能，變頻器控制下的效率就會優於傳統單相感應電動機的控制。
依據兩相電動機控制原理，本文創新提出兩相四臂型的新型直流-交流功率轉換器的變頻調速控制，相互比較一般兩相變頻調速的改善效益。新的方法有效減少開關的切換損失，而且獲得較低的電動機電流諧波，使得電動機轉動的噪音，一種來自電流諧波的電氣噪音，也獲得有效改善。
實驗驗證是針對吊扇的驅動架構，探討不同架構下的消耗功率、電流的諧波失真、噪音。吊扇的三種型式的驅動包括：(1)高電壓150V下單極性脈波寬度調變法；(2)吊扇使用低壓直流24V以下的變頻電動機；(3) 低開關損耗控制法，這三種不同驅動型式的變頻器，和傳統吊扇比較，都可以獲得不同程度的功率改善。在實驗結果中，低開關損耗控制法，有效減少吊扇功率傳統吊扇消耗的11W，改善至6W，噪音降低了，並有效的達到節能減碳的目的。

The electrical fan, based on the induction motor, operate with very low efficiency on the high slip, when the speed control is used by the series inductors or capacitors. In order to improve the efficiency of the induction motor, inverter benefit with Pulse Width Modulation (PWM) methods included the unipolar PWM and the bipolar PWM is discussed. The unipolar method shows the better harmonics performance for the improvement of the noise reduction. The inverter with PWM method also has the advantage of efficiency operation then the induction motor operated on the tradition method.
The new type two-phase induction motor speed control with four legs inverter structure compare with the conventional method by using the two-phase theory. The new method has lower switch losses and the better harmonics injection to the motor current. The noise, a kind of electrical noise caused by the current harmonics, is reduced effetely by using the new method.
In order to evaluate the performance, include the efficiency, harmonics and noise, the three kinds of tests are included. They are the high voltage (110V) and low voltage (24V) ceiling fan and the new method. The results shows that the PWM inverter with two phase theory has the better efficiency, when that compared with the traditional ceiling fan in the single phase control. The new methods with four legs inverter structure obtain the best efficiency, the power consumptions are reduced for 11W to 6W.

摘要 ii
Abstract iii
表目錄 vii
符號說明 xii
第一章 緒論 1
1.1動機及目的 1
1.2 系統架構 3
1.3 本文大綱 4
第二章 兩相感應電動機結構與數學模式 5
2.1　前言 5
2.2　感應電動機的結構與旋轉原理 5
2.2.1　兩相感應電動機的結構 5
2.2.2　兩相感應電動機的旋轉原理 6
2.3　感應電動機之數學模式 9
2.4　感應電動機的參數量測 10
2.4.1　定子繞組電阻值之量測 10
2.4.2　轉子制動試驗 10
2.4.3　無載測試 11
2.5　結語 12
第三章 兩相直流-交流功率轉換器的模式與控制 13
3.1　前言 13
3.2　兩相直流-交流功率轉換器 13
3.3　低開關損耗之控制法 21
3.4　噪音量測的計算法 26
3.5　結語 27
第四章 實體製作及實驗 28
4.1 實作系統規畫 28
4.2數位訊號處理器介面電路 29
4.3閘極驅動介面與功率級電路 30
4.4控制軟體規劃 31
4.5系統實測結果 33
4.5.1　傳統吊扇接於市電量測 33
4.5.3　吊扇使用低壓變頻驅動電路量測 39
4.5.4　降低開關損失的控制法 42
4.6結語 45
第五章 結論與未來研究方向 47
5.1結論 47
5.2未來研究方向 47
參考資料 48

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