NDLI: Analysis of end effect in ironless stator AFPM machine via MEC model

Content Provider	IET Digital Library
Author	Gao, Huamin Zhang, Zhuoran Wang, Chen Geng, Weiwei Liu, Ye
Abstract	The Halbach-array permanent magnet (PM) rotors can achieve higher air-gap flux density due to magnetic flux gathering effect, which contributes to the higher-torque density improvement of the ironless stator axial flux PM (AFPM) machine. However, the end leakage fluxes of the ironless stator AFPM machine are serious due to the large magnetic resistance of the main flux loop in ironless stator machines. Circular arc straight line permeance model is adopted to calculate magnet-to-magnet and magnet-to-rotor end leakage fluxes based on the analysis of the relationship between end leakage fluxes and coils. A magnetic equivalent circuit (MEC) model is established considering end leakage fluxes. The leakage coefficients representing the ratio of end leakage fluxes to main flux and radial coefficients representing effective radial lengths of end leakage fluxes are analysed via the MEC model. The coefficients vary with machine parameters including PM thickness, rotor yoke thickness and air-gap length. On the basis of the analysis results, the influence factors of end leakage fluxes are summarised and the 50 kW ironless stator AFPM machine is optimised. Finally, a 50 kW ironless stator AFPM machine with Halbach-array PM rotors is prototyped to verify the results of the finite element analysis and MEC model.
Starting Page	147
Ending Page	156
Page Count	10
ISSN	17518660
Volume Number	14
e-ISSN	17518679
Issue Number	Issue 1, Jan (2020)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-epa/14/1
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-epa.2019.0208
Journal	IET Electric Power Applications
Publisher Date	2019-09-27
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	50 KW Ironless Stator AFPM Machine A.C. Machine Air Gap D.C. Machines Equivalent Circuit Finite Element Analysis Halbach-array Permanent Magnet Rotors Higher Air-gap Flux Density Ironless Stator Axial Flux PM Machine Ironless Stator Machine Magnet-to-rotor End Leakage Fluxes Magnetic Equivalent Circuit Model Magnetic Field Magnetic Flux Magnetic Flux Gathering Effect MEC Model Numerical Analysis Permanent Magnet Machine Permanent Magnets Power 50.0 KW Rotors Stators Synchronous Machine Torque
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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