Performances comparison of various design slot pole of Field Excitation Flux Switching Machines with segmental rotor

Single-phase Field Excitation Flux Switching Machines (FEFSMs) are increasingly considered as suitable candidate for high speed applications due to their variable flux capability and single piece structure of rotor. However, most of existing FEFSMs have overlap windings between armature and field excitation coil (FEC) which lead to increased size of motor, copper losses as well as material costs. This paper describes the performance comparison of four topologies of FEFSMs, with particularly emphasis on the segmental rotor and non-overlap armature and FEC windings placed on the stator. The performances, including coil arrangement test, back-EMF, flux strengthening, cogging torque, flux line, flux distribution of machines are analyzed and compared by 2D finite element analysis (FEA). The results obtained show that the appropriate combination of stator slot-rotor pole configurations is 12S-6P which provide high torque and power.