Analytical Modeling and Optimization of Partitioned Permanent Magnet Consequent Pole Switched Flux Machine With Flux Barrier

Abstract

Switched Flux Permanent Magnet Machine (SFPMM) encompass unique features of conventional direct current machine, permanent magnet (PM) synchronous machine and switch reluctance machine therefore, applicable for high-speed applications. However, conventional SFPMM exhibits demerits of high PM volume $(V_{PM})$ , high torque ripples $(T_{rip})$ , higher cogging torque $(T_{cog})$ , lower torque density $(T_{den})$ and significant stator flux leakage. In this paper, a new topology of consequent pole (CP) SFPMM (CPSFPMM) is proposed having partitioned PM that improved flux modulation phenomena utilizing flux barriers. Moreover, due to non-linear behaviour of PM and complex stator structure alternate analytical sub-domain model is utilizes for initial design. However, initial design offers lower open-circuit phase flux linkage $(\Phi)$ , average mechanical torque $(T_{avg})$ and $T_{den}$ . Aforementioned electromagnetic key performance indicator with $T_{cog}$ , $T_{rip}$ , total harmonics distortion in $\Phi $ ( $\Phi _{THD}$ ), average power $(P_{avg})$ and power density $(P_{den})$ are refined utilizing Geometric-Based Deterministic Optimization (GBDO). Analysis reveals that proposed new topology of CPSFPMM with flux barriers reduces $T_{cog}$ by 34.90%, $T_{rip}$ by 20.27%, $\Phi _{THD}$ by 28.08% whereas it enhanced $P_{avg}$ by 17.79%, $T_{den}$ and $P_{den}$ by 34.38%.

Keywords

• Finite element analysis
• analytical modeling
• permanent magnet flux-switching machine
• magnetic flux leakage
• magnetic flux density distribution
• permanent magnet machines