本文探討以反電勢估測器與滑動模式觀測器達成永磁同步電動機的轉軸角度估測，並進一步完成無轉軸偵測元件永磁同步電動機驅動系統的研製。實測結果說明反電勢估測器的控速範圍為50 r/min到2160 r/min，而滑動模式觀測器的控速範圍為45 r/min到2160 r/min。在中、高轉速穩態時，反電勢估測器具有較小的估測誤差，但滑動模式觀測器具有較佳的強健性，對參數變化較不靈敏。
為了擴展無轉軸角度偵測元件永磁同步電動機驅動系統的控速範圍，文中亦探討使用高速弱磁控制，使系統能操作在比額定轉速更高速的工作區域。
文中使用德州儀器公司所生產的數位信號處理器TMS320F28035作為控制器的核心，實現反電勢估測器及滑動模式觀測器，以及高速弱磁控制。並進一步探討角度估測誤差的原因，實測結果與相關的分析結果相當接近，說明本文的可行性及正確性。

This thesis investigates the back-EMF estimator and the sliding-mode observer of rotor position estimated methods for permanent magnet synchronous motor drive systems. In addition, a sensorless permanent magnet synchronous motor dirve system has been implemented. Experimental results show that the back-EMF estimator has an adjustable speed range from 50 r/min to 2160 r/min. On the other hand, the sliding mode observer has an adjustable speed range from 45 r/min to 2160 r/min. The back-EMF estimator has smaller estimated errors in steady-state than the sliding-mode observer when the motor is operated in middle- speed to high-speed ranges. However, the sliding-mode observer, which is insensitive to the variations of the motor parameter, provides better robustness than the back-EMF estimator.
To extend the adjustable speed of the sensorless PMSM drive systems, the flux-weakening control which can be operated at a higher speed range than rated speed, is also investigated.
A digital signal processor, manufactured by Texas Instruments, TMS320F28035, is used as a control center to implement the back-EMF estimator, sliding-mode observer, and high-speed flux weakening. In addition, the reason of the estimated rotor position errors, including back-EMF estimator and sliding-mode observer, is discussed. Experimental results can verify the theoretical analysis, and show the correctness and feasibility of this thesis.

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