Abstract
In this study, the general optimal stator poles/rotor teeth (P/T) combination equation of the E-core hybrid excitation flux switching (HEFS) machines are introduced, and a new HEFS machine is proposed and optimized. Firstly, the influences of three different P/T combinations (10/18, 10/19, and 10/21) on the HEFS machines are investigated with two-dimensional (2D) finite element analyses (2D-FEA). Meanwhile, the consistency and complementarity principle of the armature windings is analyzed in detail to give reasonable explanations to the simulated results. The general optimal P/T combination equation of the E-core HEFS machines is deduced mathematically to provide an effective guidance on the selection of P/T combinations. The optimal P/T combination calculated by the general equation agrees with the simulated results which confirm the correctness of the mathematical inferences. Finally, the optimizations on the proposed HEFS machine are implemented to obtain higher output torque and better flux-regulation ratio characteristics based on which the cogging torque and torque ripple are reduced significantly.
Highlights
Stator permanent magnet machines with the PMs and windings mounted on the stator have attracted considerable attention recently as they provide a prospective solution to overcome the shortages of rotor permanent magnet machines, such as the complicated rotor structures and heat dissipations [1,2,3]
When the number of PMs are reduced and the excitation windings are introduced into the stator, flux switching permanent magnet (FSPM) machines can evolve in hybrid-excitation flux-switching (HEFS) machines
The electromagnetic performances of three five-phase E-core HEFS machines with different poles/rotor teeth (P/T) combinations are compared in detail
Summary
Stator permanent magnet (stator-PM) machines with the PMs and windings mounted on the stator have attracted considerable attention recently as they provide a prospective solution to overcome the shortages of rotor permanent magnet (rotor-PM) machines, such as the complicated rotor structures and heat dissipations [1,2,3]. Machine Based on the Consistency and Complementarity Principle better P/T combination than 10/18 for five-phase E-core HEFS (or FSPM) machines considering the total harmonic distortion (THD) of the back electromotive-force (back-EMF), the torque ripple, and the magnetic saturation. These results all show that 10/18 is not the optimal P/T combination for five-phase E-core inner rotor HEFS (or FSPM) machines. Whether 10/21 is a competitive candidate of the inner rotor structure is not clear Given that it is a relatively new structure, the conducted research on this topic has been limited, and guidance on the selection of P/T combinations of E-core HEFS (or FSPM) machines has languished. The P/T combinations of the five-phase E-core HEFS machine were reselected and the optimization on this machine was implemented to obtain higher output torque and a better flux-regulation ratio
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