Affiliations: [a] LMT-Cachan, ENS Cachan, PRES Universud Paris, Cachan,
France | [b] LGEP, SUPELEC, CNRS, UPMC, Univ Paris-Sud, Gif sur
Yvette, France | [c] School of Materials, University of Manchester,
Manchester, UK | Institute of Electrodynamics, Microwave and Circuit
Engineering, University of Technology, Vienna, Austria
Abstract: The research presented in this paper is motivated by the design of
electrical devices submitted to mechanical stress. It aims at studying the
magnetic behaviour of ferromagnetic materials submitted to biaxial stress. It
deals with the evolution of the magnetic susceptibility, coercive field and
magnetic losses with respect to stress, magnetic field level and frequency.
These quantities are of primary importance in the design of rotors for high
speed rotating machines. The work is focused on the magnetic behaviour of a standard grade of
Iron-Silicon alloy under the form of thin sheet. Non conventional experiments
are performed on cross-shaped samples in order to apply biaxial stress
representative of the loadings experienced by rotors of rotating machines.
These experiments are performed on a multiaxial testing machine, ASTREE. The
magnetic loading is applied using a single U-yoke. The measurement of magnetic
induction, magnetic field and strain is conducted by the means of needle-B
sensor, H-coil sensors and Digital Image Correlation (DIC) respectively. Both
anhysteretic and dissipative responses to magneto-mechanical loadings are
considered. The results allow to identify the more critical stress
configurations for this material.
Keywords: High speed rotating machines, biaxial stress, iron-silicon alloy, anhysteretic behaviour, dissipative behaviour, coercive field, power losses
