Abstract
Linear Flux Switching Machines (LFSMs) are suitable candidates for long stroke applications as they confines all excitation sources to primary thus leaving completely passive, robust, and low cost secondary. Permanent Magnet LFSMs (PMLFSMs) enables high thrust force density and efficiency. However, deficiency of controllable air-gap flux, risk of PM demagnetization, and increasing cost of rare earth PM materials diverted researchers towards Field Excited LFSMs (FELFSMs). FELFSMs wiped out aforementioned PMLFSM’s shortcomings at the cost of low thrust force density. In this paper, merits of PMLFSM and FELFSM are combined by proposing a novel Hybrid Excited LFSM (HELFSM). Proposed machine is excited by PMs, Field Excitation Coils (FECs), and Armature Windings (AWs). However, complex magnetic circuit of poly-excited HELFSM compels designers to adopt FE Analysis (FEA) for design, analysis, and optimization. To decrease dependency on computationally complex and time consuming FEA, an analytical model combining lumped parameter magnetic equivalent circuit, Fourier analysis, Laplace equation, and Maxwell Stress Tensor method is proposed to predict open-circuit flux linkage, B-EMF, normal and tangential components of no-load and on-load magnetic flux density, detent, and thrust force performance. Finally, predictions of the developed analytical model are validated with corresponding FEA and experimental results.
Highlights
Safe, reliable, and economical transportation system is the key factor for development of a country
Possess a unique ability of producing direct thrust force, faults and less mechanical power transfer problems associated with Mechanical Conversion System (MCS) can be eliminated
FE ANALYSIS VALIDATIONS Predictions of developed 2-D analytical model are validated with universally accepted FE Analysis (FEA) results utilizing JMAG Commercial FEA Package ver. 18.1
Summary
Reliable, and economical transportation system is the key factor for development of a country. Number of primary teeth (Pt ), PM or DC windings (WPM/DC ), AC windings (WAC ), and stator to mover pole pitch (τ s/τ m) of the proposed complementary coil design HELFSM having combination of series/parallel magnetic circuit is achieved utilizing following design guidelines equations: Pt = 4ab + 1. ANALYTICAL MODEL FOR ELECTROMAGNETIC PERFORMANCE OF HELFSM Electromagnetic performance of HELFSM is predicted utilizing Lumped Parameter Magnetic Equivalent Circuit (LPMEC) for prediction of open-circuit flux linkage and B-EMF, Laplace Equations (LEs) in term of vector potential for prediction of Magnetic Flux Density (MFD), Maxwell Stress Tensor (MST) method in the mid of air-gap for prediction of no-load detent force, and thrust force. Air-gap MEC module for HELFSM is modelled for five different mover to stator positions, under following assumptions. The phase B-EMF is determined by utilizing no-load flux linkage obtained from LPMEC and Equation 19
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
