由於直流無刷馬達具有高能源效率、免維護性、低噪音且控制容易等特性，因此日益廣泛地被應用在工業以及家電的產品中。使用無感測控制可以降低成本、縮小體積並降低整體電路複雜度。本論文採用直流無刷馬達的無感測技術，以Microchip公司之dsPIC30F3010數位訊號處理器為控制核心，實現一套易使用、具有效果、以無感測技術為基礎的直流無刷馬達控制器。本論文提出一個具有高可靠度的反電動勢零交越點偵測法，利用dsPIC30F3010數訊號處理器中內建的AD轉換器得到馬達換相的時序，然後使用閉迴路速度控制器。設定的速度控制範圍是應用於如幫浦或電扇等等在中高速度下運轉的馬達上。

Brushless DC motors have the characteristics of high power density, no maintenance, low noise and simple control, which makes them become more and more be used in industry and home applications. Using sensorless control technique of brushless DC motors can low down the cost, reduce the size and diminish the complexity of control circuit. This thesis adopts sensorless control technique for brushless DC motors and take the Microchip dsPIC30F3010 as control kernel to realize a easy use, valid and sensorless-control-based controller. This thesis also proposes a zero-crossing detection which provides high reliability. Utilizing AD converters of the dsPIC30F3010 to acquire the motor commutation sequence, and then using close-loop speed control. The speed control range in this thesis is suited for the brushless DC motors which run at medium-high speeds, such as pumps and fans.

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