Rotational Single Sheet Tester for Multiaxial Magneto-Mechanical Effects in Steel Sheets

U Aydin,A Haavisto,P Rasilo,F Martin,A Belahcen,A Arkkio,D Singh,L Daniel

doi:10.1109/tmag.2018.2889238

Abstract

A detailed design of a new rotational single sheet tester device which allows comprehensive multiaxial magneto-mechanical analysis of ferromagnetic sheets is proposed. The challenges that arose during the mechanical and magnetic design phases are addressed. The applicability of the device is tested by performing magneto-mechanical measurements on an M400-50A electrical steel sheet. Results under several multiaxial magneto-mechanical loadings with circular and alternating magnetic flux densities are reported. It is shown that the effect of multiaxial stress on iron losses can be much more significant than that of uniaxial stress.

Highlights

F ERROMAGNETIC materials are widely used in many electromagnetic applications such as electrical machines and transducers
Rotational measurements have been done under circular magnetic flux density with five different magnitudes of 0.25, 0.5, 0.75, 1.0, and 1.2 T and under several static stress states
The stressed sample is magnetized with sinusoidal magnetic flux density with 1.2 T amplitude along only rolling (x) or transverse (y) directions

Summary

Introduction

F ERROMAGNETIC materials are widely used in many electromagnetic applications such as electrical machines and transducers. In most of these devices, the material is subject to multiaxial mechanical stresses that are caused by manufacturing processes or operating conditions [1]–[6]. The orientation of the magnetic field and stress may vary in the material, since for instance, in three-phase transformers and rotating electrical machines both rotating and alternating flux conditions occur. Previous studies have shown that the performance of electrical machines is affected significantly by the complex multiaxial magneto-mechanical loadings that occur in the material [23]–[29]. The effect of stress on core losses should be studied in detail

Methods

Results

Conclusion