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Cascading the Induction Motors to Reduce the Impact of Harmonics

The effect of distorted voltage waveform on two induction motors connected Incascade through mechanical coupling is analyzed. This effect is investigated through individual harmonics and then summing the results to determine the total effect. The electrical and mechanical equations of the motor set taking the harmonics into account are built up in steady state and simulated via Matlab/Simulink software. Harmonic voltage factor (HVF) for each harmonic order is calculated.Then a quantitative comparison of the effect of the harmonics on one big single induction motor and two cascaded induction motors is analysed. The aim of such a comparison is to determine which one has a reduced harmonics effect. The paper proceeds to assess the influence of harmonics on both the starting and the maximum torques. The result show that the cascading process reduces the impacts of harmonics and improves both starting and steady state conditions.