Comparative Study of Five-Phase HEFS Machines with Different Stator Poles/Rotor Teeth Combinations and Armature Winding Connections

In this paper, five-phase E-core hybrid-excitation flux-switching (HEFS) machines with three different stator poles/rotor teeth (P/T) combinations (namely 10/18, 10/19, 10/21) are compared, and two armature winding connection methods for each combination are investigated respectively. Firstly, the topologies of the machines are analyzed theoretically and the consistency and complementarity of one phase armature winding are explained. Then, the electromagnetic performances, including phase flux-linkage and back electro-motive-force (EMF), flux-regulation ratio, electromagnetic torque and cogging torque of the proposed machines, are predicted by means of the two-dimensional (2-D) finite-element analysis (FEA). Moreover, the discussions about the predicted results of three HEFS machines are given, which indicates the optimal choice on P/T combinations and armature winding connection methods of E-core HEFS machines.