Multi-objective optimization of high torque density segmented PM consequent pole flux switching machine with flux bridge

Abstract

Due to double salient structure, Flux Switching Machines (FSMs) are preferred for brushless AC high speed applications. Permanent Magnet (PM) FSMs (PM-FSMs) are suited applicants where high torque density (T den ) and power density (P den ) are the utmost requisite. However conventional PM-FSMs utilizes excessive rare earth PM volume V PM , higher cogging torque T cog , high torque ripples (T rip ) and comparatively lower (T den ) and P den due to flux leakage. To overcome the aforesaid demerits, a new high (T den ) Segmented PM Consequent Pole (CP) FSM (SPMCPFSM) with flux bridge and barrier is proposed which successfully reduces V PM by 46.52% and PM cost by 46.48%. Moreover, Multi-Objective Optimization (MOO) examines electromagnetic performance due to variation in geometric parameters for global optimum parameters with key metric such as flux linkage (Φ pp ), flux harmonics (Φ THD ) average torque (T avg ), T cog , T rip , T den , average power (P avg ) and P den . Analysis reveals that MOO improve Φ pp by 22.68%, boost T avg by 11.41%, enhanced P avg by 4.55% and increased T den and P den by 11.41%. Detailed electromagnetic performance comparison with existing state of the art shows that proposed SPMCPFSM offer T avg maximum up to 88.8%, truncate T rip up to 24.8%, suppress T cog up to 22.74%, and results 2.45 times T den and P den .