本文旨在分析當發生單相線圈故障時，研製四開關三相變頻器之永磁式同步電動機之驅動器，以當做故障後控制策略。電力電路採用四開關三相變頻器，其驅動器採用磁滯控制與單極性正弦脈波寬頻調變做比較。三相永磁式電動機其中一相故障，可以由另外兩相電流增加、降低轉速，增加系統可靠性。永磁式同步電動機故障控制策略藉由回授其三相電流以判斷系統故障之繞組，使系統能修正未故障之兩相電流，將未故障之兩相電流相差60度相位，並增大√3倍，使能夠保持其原先輸出之轉矩。配合永磁式同步電動機電流回授及座標軸轉換，使交、直軸電流閉迴路與轉速閉迴路控制。
本文以Matlab/Simulink模擬軟體完成永磁式同步電動機及負載、三相變頻器、交軸與直軸電流閉迴路控制、轉速閉迴路控制與故障運轉之分析。

The purpose of this article is to analyze the driver of a three phase permanent-magnet synchronous motor(PMSM) with a four-switch three-phase inverter when a single-phase open-winding failure occurs as a post-failure control strategy. The power circuit uses a four-switch three-phase inverter, and its driver uses hysteresis control to compare with unipolar sinusoidal pulse width modulation. If one phase of the three-phase permanent magnet motor fails, the current of the other two phases can increase and decrease the speed to increase the system reliability. The fault control strategy of the permanent magnet synchronous motor determines the faulty winding of the system by feeding back its three-phase current, so that the system can correct the unfaulted two-phase current, and the unfaulted two-phase current can be corrected by 60 degrees angle difference, increases by √3 times larger in order to maintain its original output torque. Cooperate with the current feedback and coordinate transformation of permanent magnet synchronous motor to control the closed-loop control of q-d current and speed closed-loop control.
In this thesis, Matlab/Simulink simulation software is used to complete the analysis of permanent magnet synchronous motor, loading, three-phase inverter, closed-loop control of q-d current, speed closed-loop control and fault tolerant control strategy.

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