6AV6613-0AA11-3CA5

6AV6613-0AA11-3CA5

電磁轉矩脈動過大電磁轉矩脈動過大產生的原因如下：

(l)、 在異步電動機直接轉矩控制系統中，根據電壓開關矢量表，在逆變器的整個開關周期內， 只有一個電壓空間矢量作用于異步電動機。由于所選擇的電壓空間矢量一直作用于異步電動機，定子電流、電磁轉矩等物理量始終沿著一個方向變化。在轉矩差較大的情況下，所選擇的電壓空間矢量使轉矩在一個開關周期的較長時間內才可能達到參考值;但是在轉矩差較小的情況下， 所選擇的電壓空間矢量使轉矩在一個開關周期的較短時間內就可以達到參考值， 而余下的時間因未發生逆變器開關狀態的變化，所選擇的電壓空間矢量繼續作用于異步電動機，故轉矩繼續沿原來的趨勢變化，從而產生較大的電磁轉矩脈動。

(2)、由于受到電力電子開關器件所能承受的開關頻率的限制，在電機運行在高速狀態時，轉矩滯環控制器所設定的滯環帶寬不能太小，如果太小將會產生很大的逆變器開關損耗。這樣， 當電機運行在低速狀態時，滯環帶寬相對變大，也造成了較大的轉矩脈動。

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