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High-power and high-speed motor drives have only a few switching transitions in each line cycle. Pulse width modulation (PWM) waveforms with positive voltage transition at the positive zero crossing of the fundamental voltage (type-A) are generally considered for PWM waveform with an even number of switching angles per quarter, whereas waveforms with negative voltage transition at the positive zero...
Offline pulse width modulation (PWM) techniques are employed to reduce the line current distortion in induction motor (IM) drives where the switching frequency is highly constrained. An optimal PWM technique is proposed here for a neutral point clamped (NPC) inverter fed IM drive to minimize the motor current distortion, subject to constraints on number of switching instants per quarter cycle. Two...
Half-wave symmetry (HWS) and quarter-wave symmetry (QWS) are traditionally associated with high waveform quality of the inverter output voltage, particularly when the ratio of switching frequency to the modulating frequency (i.e. pulse number, P) is quite low. This paper investigates and establishes the possibility of high-quality pulse-width modulated waveforms with HWS, but without QWS, for P =...
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