近年來電動車發展蓬勃，為滿足駕駛透過踏板動作所要求之瞬間轉矩需求，因此具有高轉矩響應之直接轉矩控制，受到眾人矚目。本論文對可調工作週期直接轉矩控制進行研究，此法雖保留了傳統直接轉矩控制響應快速之優點，並擁有較好穩態特性，但仍有高速時轉矩變化與預期不符和總電流諧波失真過大等問題。故本文增加直接轉矩控制一個控制週期內電壓向量數，並利用磁交鏈於零向量時變化率幾乎為零之特性，為各電壓向量做導通時間之分配，使系統整體不僅保留住轉矩響應快等優點，並大幅改善馬達轉矩漣波與電流總諧波失真。
　　本文利用MATLAB Simulink電路模擬軟體建立所提出之控制架構，接著利用硬體在線迴路與數位訊號處理器進行整合測試，最後於實際測試平台上驗證本文演算法在任何操作條件下，馬達皆有較小轉矩漣波及較佳動態響應表現。

In recent years, electric vehicles have developed vigorously. In order to meet the momentary torque demand required by driving through the pedal action, direct torque control with high torque response has attracted attention. This thesis studies the direct torque control with adjustable duty cycle. Although this method retains the advantages of the traditional direct torque control with fast response and has better steady-state characteristics, problems that the torque change at high speed still does not meet expectation and that excessive current harmonic distortion occurs still exist. Therefore, in this thesis, the number of voltage vectors in one control cycle of direct torque control is increased, and the characteristic that the rate of change is almost zero when the flux linkage is at the zero vector is applied to allocate the time of switch on for each voltage vector, so that the entire system not only retains the torque’s advantages of fast response but also greatly improves the motor torque ripple and current total harmonic distortion.
This thesis uses MATLAB Simulink circuit simulation software to establish the proposed control architecture, then uses hardware in the loops and digital signal processors for integration testing, and finally proceeds with the verification on the actual test platform to get the conclusion that the algorithm in this thesis has smaller motor torque ripples and better dynamic response performance under any operating conditions.

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