Magnetics Business & Technology - Winter 2017 - 9

FEATURE ARTICLE
solver entirely captures higher flux leakage and accurately computes quantities such as flux distribution, induced voltages and developed torque.
Axial Flux Machines
In contrast to a traditional (radial flux) machine, in an Axial Flux
Machine (AFM) flux linkage between stator and rotor is aligned
with the axis of rotation. This means that the electromechanical
interaction between stator and rotor can take place at a greater
distance from the axis of rotation and produce more torque for
the same outer diameter. Most promising applications of the Axial
Flux Machines (AFM) seem to be direct drive wind turbines and fast
dynamics motoring [5].
Axial flux rotor is also known as pancake rotor, due to the large
area between rotor and stator. It is crucial to maintain desired
mechanical air gap between the stator and rotor at all operating
conditions. Predicting forces that act on the structure is extremely
important for design of the bearing mechanism and can be very
challenging. By few clicks in EMS, armature current and rotational
position of a complex 3D structure can be seamlessly parametrized
to achieve accurate, three-dimensional force calculation for a variety of loading cases and rotor positions.
Winding losses cause temperature rise between the rotors. To facilitate design of an adequate cooling system for the winding, EMS
thermal solver computes total temperature distribution in the machine, by taking in account core and stranded losses.
Conclusion
Recent developments in the technology of soft magnetic composite materials have enabled competitive manufacturing of novel
3D flux electrical machines. One of the main challenges in design of

these machines is lack of an effective 3D simulation package. EMS
by EMWorks is an electromechanical simulation tool, fully integrated in Solidworks. It allows an easy redesign of a complex machine
geometry and an instant evaluation of its performance.
References:
[1] YouGuang Guo, Jian Guo Zhu, P. A. Watterson and Wei Wu,
"Comparative study of 3-D flux electrical machines with soft magnetic composite cores," in IEEE Transactions on Industry Applications, vol. 39, no. 6, pp. 1696-1703, Nov.-Dec. 2003.
[2] Joao S. D. Garcia, Mauricio V. Ferreira da Luz, Joao Pedro A. Bastos, and Nelson Sadowski , "Transverse Flux Machines: What for?" ,
IEEE Multidisciplinary Engineering Education Magazine, vol. 2, no.1,
pp. 4-6, 2007.
[3] Powder Metallurgy Review, "SMC cores in Honda's prototype
Transverse Flux Motor for hybrid powertrains", http://www.pmreview.com/smc-cores-in-hondas-prototype-transverse-flux-motorfor-hybrid-powertrains/, July 24, 2013.
[4] Z. Wan and I. Husain, "Design of a flux switching transverse flux
machine based on generalized inductance analysis," 2017 IEEE International Electric Machines and Drives Conference (IEMDC), Miami,
FL, 2017, pp. 1-6.
[5] Daan Moreels, "This New Generation of Direct-Drive Electric Machines will Power our Future." https://www.magnax.com/magnaxblog/axial-flux-vs-radial-flux-for-direct-drive-generators, June 14, 2017
About the Author: Ahmed Khebir is president of EMWorks,Inc. in
Quebec. For more information please visit www.emworks.com.

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08/11/12 09:49

Winter 2017 * Magnetics Business & Technology

http://www.pm-review.com/smc-cores-in-hondas-prototype-transverse-flux-motor-for-hybrid-powertrains/ http://www.pm-review.com/smc-cores-in-hondas-prototype-transverse-flux-motor-for-hybrid-powertrains/ http://www.pm-review.com/smc-cores-in-hondas-prototype-transverse-flux-motor-for-hybrid-powertrains/ https://www.magnax.com/magnax-blog/axial-flux-vs-radial-flux-for-direct-drive-generators https://www.magnax.com/magnax-blog/axial-flux-vs-radial-flux-for-direct-drive-generators http://www.emworks.com https://www.agencearca.com/ http://www.metrolab.com http://www.MagneticsMag.com

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