本論文目的主要研究無量測器轉子磁通導向直接向量控制法則的分析與實現，在不利用高頻注入的方式，以量測馬達定子電壓與電流來計算轉子磁通。本論文首先設計一個全階的磁通估測器，再進一步與傳統開迴路磁通估測器比較其間的差異。本論文使用兩型傳統開迴路磁通估測器，包括電流型磁通估測器與電壓型磁通估測器；再與全階磁通估測器比較並以模擬與實驗驗證。模擬與實驗結果顯示全階磁通估測器雖然計算較為複雜，但是在磁通估測上較開迴路磁通估測器良好。
接著本論文利用全階磁通估測器配合適應性速度估測器，來實現無量測器直接向量控制。在低轉速控制上，利用電流調整項，成功的將馬達在低轉速回生煞車時不穩定的現象解決。馬達的可控速範圍可以從額定轉速 至 。
本論文實驗的核心為一PC-based數位控制板，所有的模擬與實驗程式都是在MATLAB、Simulink、Real-Time Workshop下完成。

The objective of this thesis is to conduct research on the analysis and implementation of sensorless rotor-flux-oriented direct vector control laws, in which measured motor stator currents and voltages are used to computer rotor flux without using high frequency injection. The thesis designs a full-order rotor flux observer which is further compared to conventional open-loop flux observers, which include current-model and voltage-model flux observers. All observers are compared and verified using both simulation and experiments. Both simulation and experimental results show that the full-order flux observer, though more complicated in computation, outperforms open-loop flux observers.
The thesis then applies the full-order flux observer with an adaptive speed estimator to realize speed-sensorless direct vector control. In particular, a current regulation term can successfully stabilize the regenerative braking of the drive during low speed operation. The controllable speed range is from 40 to 2000 rpm.
The experiments of this thesis are based on a PC-based digital control board. All the simulation and experimental programs are developed under MATLAB, Simulink, and Real-Time Workshop.

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