Abstract

The impact of machine geometry on the performance of double-stator synchronous permanent magnet PM machine having different rotor pole numbers is investigated in this paper The considered design parameters include the split-ratio rotor radial thickness stator back-iron thickness and rotor inner and outer radial lengths It is observed that there are optimum values for each of the design elements due to the changing condition of the electromagnetic reaction Comprehensive analysis of the effects of the above mentioned design parameters on the fundamental back-electromotive force EMF and losses are given The analysis shows that the 7-rotor pole machine has the best efficiency as well as the largest fundamental EMF value It is also observed that the least PM eddy current loss in addition to least overall core loss of the machine is seen in the 5-rotor pole machine