Reduction of common mode currents in PWM inverter motor drives

Modern PWM inverter motor drives are affected by dangerous common mode currents due to the high rate of variation of the modulated voltage. An inexpensive alternative to low pass filters which are normally used to limit common mode currents, consists in reducing such currents by using suitable modulation strategies. In the present paper a new approach for designing PWM strategies is presented able to reduce common mode currents by limiting the amount of variations of the common mode voltage. The main characteristics of the proposed approach are experimentally evaluated on a standard PWM induction motor drive.

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