Analytical validation of novel consequent pole E‐core stator permanent magnet flux switching machine

Abstract

Flux switching machines (FSMs) encompass unique features of conventional direct current machine, permanent magnet (PM) synchronous machine and switch reluctance machine. Permanent magnet FSM (PMFSM) is capable of high torque density and applicable for high-speed application, however conventional PMFSM exhibits demerits of high PM volume, high torque ripples and significant stator flux leakage. In this paper, a novel consequent pole E-core stator PMFSM is proposed and compared with conventional topology utilising 2D finite-element analysis (2D-FEA). Finite-element analysis revealed that proposed design enhanced flux modulation effects by introducing flux bridges and flux barriers as a result reduced cogging torque by reducing 46.53% of the total PM volume, reduce torque ripples by reducing PM slot effects and reduce flux leakage utilising flux bridges in the stator. Furthermore, analytical model for flux linkages, cogging torque, mechanical torque, no load and on-load magnetic flux density (MFD) is developed for initial design of conventional and proposed model. 2D analytical methodologies resolve equivalent magnetic circuits for open-circuit flux linkages, Fourier analysis for cogging torque, Laplace equations for MFD and Maxwell stress tensor for mechanical torque. Finally, results obtained from 2D-FEA and analytical methodologies are validated and compared.

Sub‐domain modelling and multi‐variable optimisation of partitioned PM consequent pole flux switching machines

“…Aforementioned designs are taken for validation purpose of the proposed design. Moreover, the proposed 12S‐13P E‐Core PMCPFSM is investigated in [1, 16, 24] and are considered here just for comparison with the new reduced 6S‐13P PMCPFSM.…”

“…Among three categories of FSMs, electrical excited FSMs offer lower power and torque densities, whereas hybrid excited FSMs offer comparatively higher power and torque but due to presence of AWS, FWS and PMs on stator, the structure becomes highly complex and costly. Therefore, PM excited FSMs are considered competent candidates when higher torque density and power are primitive demand [1].…”

“…Moreover, FEA requires expensive software/hardware and large drive due to repeated iteration [11]. Therefore, author [1, 15, 16] suggest alternate analytical model for initial design phase.…”

Torque characteristics of high torque density partitioned PM consequent pole flux switching machines with flux barriers

“…Despite of high PM usage, the narrow flux bridge saturates and provide short path to flux which upsurge flux circulation and cancellation that results an increase cogging torque, torque ripples, low torque density and power density and degrade electromagnetic performance. Concerning the PM usage, author in [9,10] reviewed reduce PM topologies PMFSMs, author in [11] introduces different E-Core and C-Core whereas comprehensive comparison is investigated in [12,13]. However, reduce PM topologies with C-Core and E-Core still suffer from stator leakage flux (as shown in Fig.…”

Design and optimization of segmented PM consequent pole hybrid excited flux switching machine for EV/HEV application

“…SPMCPHEFSM is constructed and investigated regarding for flux controllability, flux regulation capability, working principle and proceed to optimization, geometric modification for optimal stator structure, position of armature and field winding and comparison of various SPMCPHEFSM topologies. It is worth mentioning that SPMCPHEFSM is extension of the previously studies of author regarding SPM Consequent Pole FSM (SPMCPFSM) with only PM excitation [29]- [31] which were proposed on [32] to reduce PM volume and curtailed flux circulation within flux bridge and flux barrier. In comparison of the aforesaid models, the proposed model greatly helps in PM volume reduction by 46.52% and suppression of circulating flux in stator core.…”