INFLUENCE OF INTERLEAVED CONVERTERS ON IRON LOSSES IN DUAL THREE-PHASE PERMANENT MAGNET MACHINES

Although previous research has thoroughly investigated the influence of different inverter parameters on copper losses, their influence on iron losses has not yet comparably matured, especially in the field of dual three-phase machines. Such machines permit interleaving, which in turn alleviates the current load on the DC-link capacitor. This paper delineates how interleaving produces additional losses in the stator iron laminations via FEM for an electrical 30°-offset winding machine and a mechanical 180°-offset winding machine. Here, the ripple current is directly connected to the iron eddy current loss. Furthermore, the localized and rapid flux magnitude change due to interleaving is shown to induce additional eddy currents especially in those stator teeth separating the different three-phase systems.