In order to consider the different heating of positive - sequence current and negative - sequence current of the motor stator generally , the equivalent current is adopted instead of the traditional phase current . the way how to gather positive - sequence current and negative - sequence current is brought forward , and the recurrence fourier - algorithm is adopted to calculate the effective value of current and voltage , the effective value of positive - sequence current and negative - sequence current 為了全面考慮感應電動機定子正序電流和負序電流的不同發(fā)熱效應,提出了正序電流和負序電流獲取的方法,并采用遞推傅氏算法來實現電流、電壓及電流正序和負序分量的有效值的計算。