Reduction of Eddy Current Losses in Fractional Slot Concentrated Winding Synchronous PM Machines
This paper presents the results of an investigation focused on the rotor eddy current losses of a permanent magnet (PM) synchronous machine that is equipped with fractional slot concentrated windings (FSCWs) Major spatial harmonics that induce the most significant rotor eddy current losses are identified and evaluated. Time stepped finite element analysis results are presented to compare the predicted losses in the proposed FSCW PM machine designs. It is shown that the lowest total eddy current losses in the rotor core and magnets are achieved by introducing flux barriers into the rotor back iron along the d axis.
IEEE Transactions on Magnetics