本論文主要在研究一種具有空間電壓向量脈寬調變的直接轉矩控制法，來控制永磁同步馬達，並利用自行設計的TMS320F2812數位訊號處理器實驗板完成實驗架構，藉著數位訊號處理器高精確與可靠及不易受溫度變化和雜訊干擾之特性，以實現全數位化的永磁同步馬達控制系統。

　　在本論文所提出的理論中，為了要消除傳統的直接轉矩控制法，在低轉速時，因為磁通鏈無法被正確的估算出來所造成的誤差，所以在本論文加入了一個磁通鏈補償器在控制架構中來克服這個誤差造成的系統不穩定。此外，為了改善磁通鏈圓的追蹤軌徑，本論文使用了兩組PI控制器來調節轉矩誤差和定子磁通鏈的誤差，由這兩個控制器的輸出透過磁通鏈調節器來產生一組電壓命令 來決定空間電壓向量脈寬調變寬度及控制磁通鏈圓追蹤軌跡的大小。

　　最後由模擬及實驗的結果來比較本論文所提出的直接轉矩控制法與傳統的直接轉矩控制法的效能，由結果可以看出本論文所提出的直接轉矩控制法，在控制效能上確實是優於傳統的直接轉矩控制法。

　This thesis presents a new direct torque control (DTC) system to control the permanent magnet synchronous motor (PMSM) based on a TMS320F2812 digital signal processor (DSP) experiment board. The digitalized PMSM control system was implemented by using DSP experiment board with advantages such as high precision and reliability and the controlling error caused by the variance of temperature or the interference of noise can be banished.

　The proposed DTC scheme in this thesis uses a flux compensator to eliminate the error in stator flux estimation at low speed operating region of the conventional DTC. Furthermore, to improve the flux linkage tracking, two PI controllers used to be the torque controller and the flux controller. The outputs magnitude of the flux regulator, , is controlled by the outputs of the torque controller and flux controller. The voltage command of the output of the flux regulator will be used to decide the space voltage vector PWM and determine the magnitude of the stator flux linkage.

　The simulation and experimental results for the proposed DTC were compared with a conventional DTC. These show that the proposed DTC has a high control performance than the conventional DTC.

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