PD IEC/TR 62581:2010

FOREWORD
INTRODUCTION
1 Scope
2 Normative references
3 Terms and definitions
4 Method of measurement of the magnetostriction
   characteristics of electrical steel sheets under
   applied stress by means of a single sheet tester
5 Examples of the measurement systems
6 Examples of measurement
7 Methods of evaluation of the magnetostriction behaviour
Annex A (informative) - Requirements concerning the
        prevention of out-of-plane deformations
Annex B (informative) - Application of retained stress
        model to measured stress shifts
Annex C (informative) - A-weighted magnetostriction
        characteristics
Bibliography

Explains the general principles and technical details of the measurement of the magnetostriction of single sheet specimens preferably 500 mm long and 100 mm wide and Epstein strip specimens, specified in IEC 60404-2, of electrical steel by means of optical sensors and accelerometers.

This technical report describes the general principles and technical details of the measurement of the magnetostriction of single sheet specimens preferably 500 mm long and 100 mm wide and Epstein strip specimens, specified in IEC 60404-2, of electrical steel by means of optical sensors and accelerometers.

These methods are applicable to test specimens obtained from electrical steel sheets and strips of any grade. The characteristics of magnetostriction are determined for a sinusoidal induced voltage, for specified peak values of magnetic polarization and for a specified frequency.

The measurements are made at an ambient temperature of 23 °C ± 5 °C on test specimens which have first been demagnetized.