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A new method for determining the magnetic properties of solid materials employed in unconventional magnetic circuits

Mohammed, A.; Cox, Tom; Galea, Michael; Gerada, C.


A. Mohammed

Professor of Electrical Machines and Drives


The mechanical and thermal properties of common, solid (non-laminated) ferromagnetic materials are widely available, but the electro-magnetic characteristics of such solid materials are often undefined. Existing characterization procedures such as the toroidal ring sample test method are capable of mapping the electro-magnetic properties of solid materials quite accurately when investigating materials to be used in conventional magnetic circuits, i.e. where the flux paths and induced eddy currents follow the more common ‘radial’ characteristics as in a standard rotating machine. When solid ferromagnetic material is employed in unconventional machine structures, such as for transverse flux machines or tubular linear machines, simple toroidal test methods do not accurately represent the flux conditions in the stator material. In this paper a new testing method is proposed to accurately impose the correct flux conditions for tubular linear machines. The proposed method uses a simple experimental test setup to characterize the magnetic properties of solid, ferro-magnetic material. The basic experimental results from the new setup are compared to results from 3D finite element analysis.


Mohammed, A., Cox, T., Galea, M., & Gerada, C. (in press). A new method for determining the magnetic properties of solid materials employed in unconventional magnetic circuits. IEEE Transactions on Industrial Electronics,

Journal Article Type Article
Acceptance Date May 12, 2016
Online Publication Date Jul 7, 2017
Deposit Date Jul 8, 2016
Publicly Available Date Jul 7, 2017
Journal IEEE Transactions on Industrial Electronics
Print ISSN 0278-0046
Electronic ISSN 1557-9948
Publisher Institute of Electrical and Electronics Engineers
Peer Reviewed Peer Reviewed
Keywords Materials characterization, solid materials, toroidal ring test, tubular machine (TLPM), eddy current losses
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Additional Information 2016 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works


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