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High efficiency, unity power factor VVVF drive system of an induction motor

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6 Author(s)
Morimoto, M. ; Mitsubishi Heavy Ind. Ltd., Yokohama, Japan ; Sumito, K. ; Sato, S. ; Oshitani, K.
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A high-efficiency, unity-power-factor VVVF (variable voltage, variable frequency) drive scheme for an induction motor is presented. A unity-power-factor PWM (pulsewidth modulated) converter regulates DC voltage. An inverter circuit with the magnetic flux control PWM method generates VVVF PWM waveforms. The modulation factor of the inverter PWM control with controllable DC link DC voltage is studied. As a result, the distortion factor and the switching frequency are reduced by over-modulation with low DC link voltage. A high-efficiency and unity-power-factor VVVF induction motor drive has been achieved using the control strategy

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Power Electronics, IEEE Transactions on  (Volume:6 ,  Issue: 3 )