Output voltages of an conventional voltage-source PWM inverter applied to AC motor drive systems, contain high level switching frequency ripples due to the PWM operation, while output currents are kept nearly sinusoidal. The high level harmonics in the output voltage cause acoustic noises and iron losses. To improve the output voltage waveforms, the authors propose a novel inverter with sinusoidal voltage and current outputs, which has a L-C passive filter and an active filter function. The paper shows principle of the novel inverter and some simulation results. Simulation results shows satisfactory operation when it is applied to a field-oriented vector control system of an induction motor.
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