Journal de Physique III, Journal de Physique Archives représente une mine d informations facile à consulter sur la manière dont la physique a été publiée depuis 1872.

This paper presents measured data and electromagnetic FEM field calculations as techniques for detecting and analyzing eccentricity in three-phase induction motors. Also it presents experimental results for detecting broken bars in induction motor rotors. A search-coil is used as magnetic field sensor to measure the stray magnetic flux outside the motor. It is a totally non-invasive method.

Based on a multiscale modelling of the anhysteretic magnetization taking into account mechanical stress and crystallographic texture effects, an extension of the Jiles-Atherton (J-A) hysteresis model is proposed. The magnetization and the volume fractions given by the multiscale approach are advantageously used in the J-A model to modify the anhysteretic magnetization and the pinning parameter. The parameters of the proposed model are identified in order to fit with characterization results under compressive stress using two sets of experimental data. Using the same optimized parameters, the model is tested for the representation of loops under other stress conditions to evaluate its prediction capabilities.

The present paper details the development of a uniaxial magneto-mechanical bench that allows measuring the effect of constant tensile and compressive stress on the magnetic properties of electrical steel sheets. Following international standards for magnetic measurements, this work proposes reasonable modifications of a Single Sheet Tester setup to provide a reliable magneto-mechanical characterization of the material. The magnetic circuit, as well as the excitation and control techniques employed are described. Specifications concerning magnetic measurements are also offered, alongside mechanical considerations regarding the anti-buckling fixture developed to allow the application of compressive stress. Finally, results obtained for various stress levels and frequencies are validated and analyzed. Among other results, the proposed bench allows observing the negative impact of compressive stress on magnetic properties of non oriented steel, as well as the positive effect of mild tensile stress.