A magnetostriction single-sheet tester with an air compressor was developed and the magnetostriction in an electrical steel sheet was measured by a triaxial strain gauge under applied stresses externally and higher harmonic of field. The magnetostriction property’s sensitivity on the applied stress was described. This investigation also tried to understand the relationship between the presence of higher harmonics in the magnetization waveform and those in the magnetostriction waveform under a certain stress. The study results for the magnetostriction under stresses and harmonics show that the appearance of harmonic of magnetic field cannot be ignored, which aggravates the principal strain harmonics.
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