為了因應產品輕薄化之訴求，本研究以薄型永磁無刷馬達為研究主題，在系統空間及成本的考量下，發展適用於薄型馬達之無感測器驅動技術。因所探討的薄型馬達受限於輕薄尺寸，具有微感量及低反電動勢常數之特徵，若採取一般的無感測器驅動技術並不易實現。鑒於此，本文在低成本及高實現性的前提下，提出二種改良型反電動勢估測法，依此發展適用於薄型馬達之無感測器驅動架構。於理論分析與實驗比較下，所提出之改良型端電壓比較法，透過特殊的端電壓比較邏輯來產生虛擬的換相參考訊號，此估測技術無需中性點電壓、濾波器及相移機制，可有效提升系統頻寬及改善低速估測性能。
　　本文針對開迴路啟動至閉迴路換相之切換提出改良技術，使切換瞬間不受轉矩角效應之影響，提供開迴啟動較大的應用彈性。再者，在無需耦合器及位置感測器的條件下，整合無感測器驅動及參數估測之技術，間接估測馬達反電動勢常數及特性曲線，以提供馬達設計者驗證設計規格之參考平台。由理論分析及實驗結果證明，本研究結果可使馬達的驅動控制及參數量測不因尺寸輕薄化而受限，可有效的應用於高速、輕薄化之場合，如散熱風扇及儲存裝置等應用。

　Due to the strong demand for miniature designs on the market, slim motors make the best candidate for compact applications. This thesis employs a slim-type permanent magnet brushless motor to minimize the overall system volume. The design and implementation of the sensorless control schemes are developed, in regard to economical and practical considerations, such as size, cost and reliability.
　As slim motors feature micro-inductance and low-back EMF constant, it is not feasible to adopt traditional back EMF detection methods in the sensorless drive. Thus, two improved schemes are proposed for slim motors. The extended analysis and comparisons are further made for both of them. In the second approach, the commutation signals are extracted directly from the specific line-to-line voltages with comparators, instead of utilizing the motor neutral voltage, analog filters and phase shifters. In comparison with the conventional methods, this approach effectively improves the system bandwidth and low speed performance.
　Moreover, the torque angle effect free technique at the start-up to the commutation instant provides the flexibility for various applications. With the sensorless drive, it is estimated that the back EMF constant provides the verification for the motor designers without any coupling. Because of the inherent properties, the proposed control algorithm is particularly suitable for high speed or compact applications, such as cooling fans and storage devices. Theoretical analysis and experiments are conducted to evaluate the effectiveness of the proposed technique.

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