由于在直接轉矩控制中一個周期內只能給定一個工作電壓矢量，且會產生周期性的偏
差，控制系統不能實時的給出新的控制信號，因而會產生較大的轉矩脈動。本文提出了一種新的減小轉矩脈動的直接轉矩控制方法，在傳統異步電機直接轉矩控制的基礎上推導出轉矩微分方程，分析了轉矩脈動的原因，根據轉速與轉矩的關系，預先判斷控制時間誤差，通過時間誤差的變化量改變轉速給定值，達到減小轉矩脈動的目的。實驗結果表明，該方法可使轉矩快速地收斂于給定值，能夠有效地減小轉矩脈動。
關鍵詞：直接轉矩控制；轉矩脈動；轉速補償；
Abstract: in the direct torque control(DTC) systems, because a voltage vector can be given in one periodicity in the direct torque control(DTC) systems, the system will produce the large torque ripple. A new torque differential equation was deduced and the reasons for torque ripple were analyzed. The control strategy introduced the idea of torque prediction to reduce the torque ripples, and according to the relationship between the rotational speed and torque, predicting the error of control period and changing the rotational speed which have been given, It can reduce the torque ripple usefully. Experimental results show that the proposed strategy can rapidly converge on the set torque value and decrease the torque ripple effectively，and have the same dynamic performance as the conventional DTC.
Key words: direct torque control (DTC); torque ripple; rotational speed compensate;