因應逐年增長的電動車市場需求，高效能馬達驅動系統將成為現階段研發與應用的目標，已知高切換頻率的驅動器可降低轉矩漣波，並提升其效率和功率密度。然而，更高的切換頻率將伴隨著更高的切換損失，使得驅動器的散熱設計更加嚴苛，從而限制驅動器的效率提升和體積縮減。
本論文首先推導直接轉矩控制和永磁同步馬達數學模型，利用SiMetrix/SIMPLIS電路模擬軟體對零電壓切換變頻器進行參數設計及波形驗證，再藉由MATLAB/Simulink整合零電壓切換變頻器、直接轉矩控制法和永磁同步馬達進行模擬。同時將碳化矽功率元件的SPICE model匯入ANSYS Twin Builder用以模擬開關切換波形，經計算其切換損耗將顯著減少。此結果使得操作頻率得以適度提高，從而降低轉矩漣波。本文基於碳化矽功率元件，實作一零電壓切換變頻器之電路雛型，並透過實測驗證理論的可行性與零電壓切換變頻器對驅動器效率之改善。

In response to the growing electric vehicle market demand, more attention is paid to the development of the high-efficiency motor drive system. It is known that a driver with higher switching frequency can reduce torque ripple, in addition to improving its efficiency and power density. However, higher switching frequency will lead to higher switching loss, which makes the cooling requirement of the driver more stringent, thus limiting the efficiency and the power density improvement of the driver.
In this thesis, the mathematical models of direct torque control and the permanent magnet synchronous motor are developed and presented. SiMetrix/SIMPLIS is used for the parameter design and the circuit analysis, while MATLAB/Simulink is used to build a permanent magnet synchronous motor drive system implementing a zero-voltage switching inverter and direct torque control. At the same time, the SPICE model of the silicon carbide MOSFET is imported into ANSYS Twin Builder to analyze the switching waveform and the switching loss of power MOSFET. As a result, the switching loss is significantly reduced and the operating frequency of the driver can be further increased. With higher operating frequency, torque ripple can be reduced. A prototype of a zero-voltage switching inverter based on silicon carbide MOSFET is implemented to verify the theoretical analysis and performance improvement through the experiment.

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