Abstract
Computational complexity, magnetic saturation, complex stator structure and time consumption due to repeated iteration compels researchers to adopt alternate analytical model for initial design of electric machines especially Switched Flux Machine (SFM). To overcomes the abovesaid demerits, In this article alternate analytical sub-domain model (SDM) for magnetic field computation in Segmented PM switched flux consequent pole machine (SPMSFCPM) with flux bridge and flux barriers accounting boundary and interface conditions, radial magnetized PMs (RM-PMs) and circumferential magnetized PMs (CM-PMs), interaction between stator slots and inner/outer rotor topologies is proposed. Overall field domain is divided into air gap, stator slots and Permanent Magnet (PM) accounting influence of CM/RM-PMs under no-load and on-load conditions. Analytical expression of field domain is obtained by solving magnetic vector potential utilizing Maxwell’s equations. Based on the magnetic field computation especially no-load and on-load condition, Magnetic Flux Density (MFD) components, open-circuit flux linkage, mechanical torque and cogging torque are computed utilizing Maxwell Stress Tensor (MST) method. Moreover, developed analytical SDM is validated with globally accepted Finite Element Analysis (FEA) utilizing JMAG Commercial FEA Package v. 18.1 which shows good agreement with accuracy of ~98%. Hence, authors are confident to propose analytical SDM for initial design of SPMSFCPM to suppress computation time and complexity and eliminate requirements of expensive hardware and software tools.
Highlights
Flux switching Machines (FSMs) are classified in to three classes based on excitation source i.e. Permanent Magnet (PM) excitation, Field winding excitation and Hybrid excitation [1]
Design of SPMSFCPM model as shown in Figure. 2 shows that SPMSFCPM stator core is comprised of E-core stator slot structure with alternate h-shaped stator tooth which enclosed Circumferential Magnetized PMs (CM-PMs) and Radial Magnetized PMs (RM-PMs) to diminish stator leakage flux
RM-PMs helps in leakage flux suppression from PMs poles resulting an improved magnetic flux density in the stator yoke and improving the flux linkage by passing through alternative flux bridges and flux barriers and link to the rotor
Summary
Flux switching Machines (FSMs) are classified in to three classes based on excitation source i.e. Permanent Magnet (PM) excitation, Field winding excitation and Hybrid excitation [1]. A comprehensive review on analytical modelling approaches is illustrated in [7], [8] and discussed for automate numerically mapping, Schwarz– Christoffel (SC) method is developed utilizing SC MATLAB toolbox This mapping offers efficient analysis tool and allows polygonal boundaries transformation to simpler domain. Saturated structure machines are being investigated by Magnetic Equivalent Circuits (MEC) modelling to predict open circuit phase linkage [19]. This modelling technique is dependent on flux paths and tubes in airgap [20], [21]. A comprehensive overview of the analytical sub-domain model accounting boundary and interface conditions, influence of RM-PMs and CM-PMs, interaction between stator slots and inner/outer rotor topologies are presented and compared with FEA for design of SPMSFCPM.
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