本文旨在分析與研製六臂型三相變流器之永磁式同步電動機的驅動器。電力電路採用六臂型三相變流器，每相繞組分接於兩臂上，形成三個單相直流-交流轉換器，其驅動控制採用單極性正弦脈波寬度調變，可提升系統直流鏈電壓使用率。三相永磁式電動機其中有一相故障，可以由另外二相繞組而降載持續運轉，增加系統之可靠性。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，令未故障之兩相電流角度相差 度相位，以降低脈動轉矩，使其運轉之轉矩更為平滑穩定。利用六個霍爾效應偵測元件之磁極偵測信號，以估測轉子磁極角位置及轉速，配合永磁式同步電動機電流回授及座標軸轉換，以完成交、直軸電流閉迴路控制與轉速閉迴路控制。
本文以計算機模擬軟體Matlab/simulink完成永磁式同步電動機及負載、六臂型三相變流器之單極性正弦脈波寬度調變控制、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；並採用數位信號處理器TMS320F2808為控制核心，完成100 W六臂型三相變流器之永磁式同步電動機驅動系統之實測，其轉速為170 rpm，負載為4 N-m，於系統正常運轉時，電流總諧波失真率為14.67%。於單相繞組故障時，電流總諧波失真率分別為17.90%、16.48%及17.37%，實驗結果驗證控制策略之可行性。

The thesis is concerned with the analysis and development of six-leg three-phase inverter for permanent-magnet synchronous motor(PMSM) drives. The power circuit uses six-leg three-phase inverter. Connecting each winding to two separately controlling legs yields three phase dc-ac converter. The inverter control strategy uses unipolar voltage switching method to raise the utilization factor of dc-link voltage. When a winding of three-phase PMSM breaks down, the associated load may have to be reduced to retain continuous running and increase the reliability of the system. In the fault tolerance control strategy, the current of PMSM is used to determine which winding is broken, so that the other two winding currents can be corrected to result in a 60-degree angle difference, thereby reducing torque pulsation. In the proposed system, six Hall-effect sensors are used to measure the position and speed of the rotor to facilitate the coordinate transformation of feedback current to achieve d-q currents and speed closed-loop control.
In this thesis, Matlab/Simulink is used to simulated the proposed PMSM system including six-leg three-phase inverter with unipolar voltage switching method control strategy, d-q current closed-loop control, speed closed-loop control and fault tolerance control strategy. The digital signal processor TMS320F2808 is adopted as the control core. A prototype of 100W six-leg three-phase inverter for PMSM drives is built. The speed is 170 rpm and the load is 4 N-m. When under the normal operation of the system, the total harmonic distortion of each phase-current is 14.67 %. While for two-winding operations of three different cases, the total harmonic distortions of three phase-currents for each case measured are 17.90%, 16.48% and 17.37%, respectively. The proposed system performance is thus verified experimentally.

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