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Comparative Study of Air-Cored Axial-Flux Permanent-Magnet Machines With Different Stator Winding Configurations | IEEE Journals & Magazine | IEEE Xplore

Comparative Study of Air-Cored Axial-Flux Permanent-Magnet Machines With Different Stator Winding Configurations


Abstract:

This paper presents a comprehensive analysis and comparison of air-cored axial-flux permanent-magnet machines with different types of coil configurations. Although coil f...Show More

Abstract:

This paper presents a comprehensive analysis and comparison of air-cored axial-flux permanent-magnet machines with different types of coil configurations. Although coil factor is particularly more sensitive to coil-band width and coil pitch in air-cored machines than conventional slotted machines, remarkably no comprehensive analytical equations exist. Here, new formulas are derived to compare the coil factor of two common concentrated-coil stator winding types. Then, respective coil factors for the winding types are used to determine the torque characteristics and, from that, the optimized coil configurations. Three-dimensional finite-element analysis (FEA) models are built to verify the analytical models. Furthermore, overlapping and wave windings are investigated and compared with the concentrated-coil types. Finally, a prototype machine is designed and built for experimental validations. The results show that the concentrated-coil type with constant coil pitch is superior to all other coil types under study.
Published in: IEEE Transactions on Industrial Electronics ( Volume: 62, Issue: 2, February 2015)
Page(s): 846 - 856
Date of Publication: 29 August 2014

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