近年來，隨著環保意識抬頭，各國對電動車的研究逐漸蓬勃發展。其中，內藏型永磁同步馬達因具有高功率密度、高扭矩密度、寬廣的轉速範圍等特性，逐漸成為電動車市場的主流應用趨勢。此外，各電動載具企業亦對馬達驅動系統之高效率操作範圍有更高的要求，以延長電池的使用時間及行駛里程。本文分析驅動系統之損失來源，以內藏型永磁同步馬達搭配低於馬達額定功率之升壓轉換器，利用兩種不同之直流鏈電壓，使驅動系統不論在低速與高速區間都可保持高效率，拓展其高效率操作區域。
　　本文提出之驅動系統操作結合了升壓轉換器、每安培最大轉矩控制、弱磁控制三者，涵蓋大部分馬達操作之區域，並以小訊號模型研究直流鏈電壓對轉速及轉矩之影響，且以阻抗匹配分析，確保升壓轉換器與變頻器操作之穩定性。本文利用MATLAB/Simulink為動態模擬工具，模擬所提出之控制架構，並以實際測試驗證所提出之方法，在高、低轉速區域都擁有較高之效率，並延伸操作範圍。

In recent years, with the rise of environmental awareness, the research on electric vehicles has rapidly developed. The interior permanent magnet (IPM) motor has become the mainstream application trend in the electric vehicle market due to its high power density, high torque density, and wide speed range. In addition, there is a higher demand for the high-efficiency operating range of the motor drive system has arisen regarding the extension of the battery life and the wider driving range.
　This thesis analyzes the loss sources of the drive system via combining IPM motor drive with the boost converter that has lower rated power than the motor. With two different DC link voltages applied, the drive system can maintain high efficiency in both low-speed and high-speed ranges and further expand its high-efficiency operating area. The proposed drive system combines the boost converter, maximum torque per ampere control (MTPA), and flux weakening control (FW) to cover the motor operating region, also uses small-signal model to study the effect of DC-Link voltage on speed and torque, and analyzes the impedance matching to ensure the stability of the boost converter and the inverter. This thesis exploits MATLAB/Simulink to simulate the control structure and circuit and also conducts the experiment to verify that the proposed method can keep high efficiency in the high and low speed regions and extend the operating range as well.

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