本文探討內藏式永磁同步馬達之直接磁通控制，一般習知的磁場導向控制是利用 軸電流間接控制電磁轉矩，直接磁通控制係控制磁交鏈與激磁電流，以達到馬達驅動之向量控制，此方法可改善複雜的電壓解耦控制步驟。直接磁通控制是於定子磁通座標軸上，分別實現控制磁交鏈以及激磁電流控制，其磁交鏈閉迴路控制採用PI控制設計，電流閉迴路控制則採用P控制器。除了磁交鏈和電流閉迴路控制設計是重點外，磁交鏈回授資訊的處理對於系統的性能優劣與否亦是相當重要，本研究之磁交鏈是利用電壓模型估測器，及利用相鎖迴路( Phase-Locked Loop, PLL )獲得激磁磁交鏈角度資訊，根據回授激磁電流及磁交鏈帶入轉矩方程式驗證是否與電磁轉矩互相符合，並可間接得知驗證直接磁通控制之策略。

AC motor drive control method can be divided into scalar control and vector control. The transient response and accuracy of the vector control method is better than that of the scalar control method. Basing on the main driving control basis of vector control methods, field oriented control (FOC) and direct torque control (DTC), this paper proposed a new vector control, direct flux vector control (DFC), by combining the space vector pulse width modulation and flux controller, which is suitable for sinusoidal ac motor drives. By operating in stator flux coordinates to control flux linkage and excitation current, electromagnetic is generated to achieve vector control of the motor drive. Such a method can improve complex voltage decoupling control steps; in addition, only PI controller and P controller are used in flux linkage and exciting current controller. Further, the feedback processing of the flux linkage information is very important for the performance of the system; hence, the voltage model is employed for estimation, and the phase-locked loop (PLL) is adopted to obtain the angle information of the flux linkage.

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