Abstract
A new method to mitigate the adverse effects of PWM inverter is discussed in this paper. A PWM inverter fed ac motor drive system capable of suppressing all the adverse effects of PWM inverter based on active cancellation method is developed. An active EMI filter proposed for this system is characterized by sophisticated connection of two small separate filters, which they can mitigate common mode voltages produced by PWM inverter and can suppress leakage current. As a result small active filter with ability of reducing of all the adverse effects is approached. Experimental results show the reduction characteristics of the shaft voltage, bearing current and leakage current in the whole system
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