本文旨在研製雙組三相永磁式同步電動機故障後控制策略。本文以數位信號處理器為系統控制核心，並採用兩組三相三臂型變頻器電路。為了提升系統直流鏈電壓利用率，本系統採用電壓空間向量脈波寬度調變做為系統驅動控制。永磁式同步電動機使用解角器作為轉子磁極角位置及轉速回授信號。使用電流偵測元件回授電動機側的電流，將回授的雙組三相電流，配合轉子旋轉座標系統轉換成qd軸電流，進行qd軸電流閉迴路控制。在故障後控制方面，依據單位時間內各相電流積分值是否為零，判斷電動機每相電路斷線故障。若發生故障，則將故障的三相繞組切離，而另外一組三相繞組持續運轉，以提高系統可靠性。
本文採用Matlab/Simulink軟體模擬雙組三相變頻器及雙組三相永磁式同步電動機之驅動系統，驗證本文控制策略可行性。本文已完成實體製作，雙組三相繞組可正常運轉，亦可在偵測到abc相繞組或xyz相繞組發生每相斷路故障時，進行故障後控制，使電動機繼續運轉。在實測結果方面，轉速為1000rpm且電磁轉矩約為9.4N-m的條件下，雙組三相繞組運轉時的相電流峰值分別為29.3A及28.9A，系統整體效率為90.8%。在xyz相繞組故障時，abc相電流峰值為57.6A，系統整體效率為89.7%。在abc相繞組故障時，xyz相電流峰值為57.1A，系統整體效率為89.1%。綜上所述，經實驗後可驗證本文控制策略可行性佳。

This thesis aims to develop the post-fault control strategy of dual three-phase permanent magnet synchronous motor(PMSM). Using the digital signal processor(DSP) to control the entire system and two sets of three-phase three-leg inverters are adopted. In order to improve the system dc-link voltage utilization, the system adopts the voltage space vector pulse wave width modulation(VSVPWM) as the system drive control. The feedback of rotor position and speed is implemented by the resolver. Then use the current sensor to feed back the dual three-phase current, and transfer it into quadrature-, direct-current by Park's Transformation for the close-loop current control. In terms of post-fault control, it is determined according to whether the integral value of each phase current is zero per unit time. In case of failure, the faulty three-phase winding are cut off and another set of three-phase windings are operated continuously to improve the reliability of the system.
In this thesis, Matlab/Simulink is used to simulate the proposed PMSM system and verify the feasibility of this control strategy. The prototype of the two three-phase three-leg driving circuits of dual three-phase PMSM is completed. Dual three-phase windings can operate normally and the motor can also perform post-fault control when the failure of abc or xyz windings are detected. The overall efficiency of the system is 90.8% as the peak values of the dual three-phase current are 29.3A and 28.9A when the motor operates under the normal conditions of 1000rpm with about 9.4N-m electromagnetic torque. When the xyz winding fault, the overall efficiency of the system is 89.7% as the peak value of abc-phase current is 57.6A. When the abc winding fault, the overall efficiency of the system is 89.1% as the peak value of xyz-phase current is 57.1A. The feasibility of the proposed system is verified by the experiments.

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