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本文推荐的脉宽调制(PWM)方法力图显著地减小在逆变器供电拖动系统中谐波引起的有害影响。本文的探讨是基于恰当地选择换流角使电动机谐波电流的均方根值最小化。既对单相也对三相半桥逆变器在每个周期有不同换流次数的换流方式进行了计算。单相情况下的分析程序可以推广,以简化三相情况的计算。本文还将被推荐的方法和其它应用中的脉宽调制方法进行了比较。
The proposed pulse-width modulation (PWM) approach seeks to significantly reduce the detrimental effects of harmonics in inverter powered traction systems. The discussion in this paper is based on minimizing the rms value of the motor’s harmonic current based on a proper choice of commutation angle. Both the single-phase and three-phase half-bridge inverter converter in each cycle has a different number of commutation method was calculated. Analytical procedures in single-phase cases can be generalized to simplify the calculation of three-phase conditions. This article also compares the recommended method with the pulse width modulation method used in other applications.