在馬達驅動器系統加裝位置感測器除增加馬達本體體積以及裝置成本外，還可能降低系統可靠度。為能不藉由感測器驅動馬達，許多無感測控制策略在近十幾年已廣被研究，其中以基於電壓模型開迴路估測方法最為容易實現。但是在該方法中，使用積分器衍生初始值與直流偏移問題。本論文提出一種新型無感測估測策略，應用於表面型永磁式同步馬達的驅動系統。所提出的改良型估測器不會有初始值與直流偏移的問題，因為磁鏈向量並非藉由積分反電動勢所得。與現存方法相比，由於所提方法中，轉子位置是直接將估測之反電動勢相角透過加減法器計算獲得磁鏈向量之角度，因此具有高速系統動態響應。本文提出一完整無感測器式馬達驅動器設計方案，其中包含初始位置定位方法與啟動方法，以及改良型轉子位置估測器的設計。所提出方法之可行性除藉由模擬證實外，亦實作一套1kW驅動器系統，驗證所提方法確實可改善演算複雜度，同時亦避免使用積分器所存在的問題。

The presence of the external position sensors increases the size of the motor and the cost of the drive, and may reduce the reliability of the system. To drive a motor without a transducer, many sensorless control strategies have been investigated over the last several decades. Among these strategies, open-loop, voltage-model-based method is the simplest way to fulfill the sensorless control. However, the use of an integrator in the control loop causes the initial value and the dc drift problems. To eliminate these problems, a more complicated algorithm would be needed. In this thesis, a new rotor-position estimating strategy is proposed for surface-mounted, permanent-magnet synchronous motor (SPMSM) drive systems. The initial value and the dc drift problems can be solved in the proposed rotor-position estimator by computing the phase angle of the flux-linkage vector through estimating the back-electromotive-force (EMF) angle with an adder or subtractor, instead of integrating the back-EMF with an integrator. Compared with the existing approaches, the proposed algorithm thus has faster system dynamic response. To implement the sensorless-drive system, the initial-position locating scheme, the motor startup method, and the design of the proposed rotor-position estimator are presented in the thesis. The feasibility of the proposed method is then verified by the simulation and the experimental results of a 1 kW sensorless-drive system. Both the results justify that the proposed method can improve the complexity of the existing algorithm and avoid the problems in the use of an integrator.

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