Polyphase drive systems configuration aiming EMI mitigation

Topologies of motor drive systems are studied, \ud aiming the reduction of common-mode (CM) currents. Initially, \ud the aspects concerning the CM currents circulation are analysed. \ud The reason of common-mode voltages generation, the circulating \ud paths for the resulting CM currents and their effects are \ud discussed. Then, a non-conventional drive system configuration \ud is proposed in order to reduce the CM currents and their effects. \ud This configuration comprehends a non-conventional inverter \ud module wired to a motor with an unusual connection. The cables \ud arrangement differs from the standard solution, too. The \ud proposed topology is compared with other ones, like the active \ud circuit for common-mode voltages compensation. The \ud contribution of the configuration to the reduction of CM voltages \ud and currents and their related interferences are evaluated, based \ud on numerical simulations. Some results are presented and \ud discussed regarding the suitability of the proposed configuration \ud as a potential solution to reduce the CM currents effects, when \ud the state of art and implementation cost of drives are taken into \ud account.ABB LtdaCentro Tecnológico da Marinha in São Paulo (CTMSP