METHOD OF USE OF VARYING MAGNETIC FIELD FOR IDENTIFYING PARAMETERS OF RESIDUAL MAGNETIZATION OF FERROMAGNETIC OBJECTS AS ANALOGUE TO EFFECT OF MECHANICAL STRESS Russian patent published in 2021 - IPC H01F13/00 G01R33/12 

FIELD: electrical engineering.

SUBSTANCE: invention relates to electrical engineering and can be used for assessment of a magnetic field of residual magnetization of ferromagnetic objects under mechanical stress. The dependence of the induction of the magnetic field of residual magnetization of the object on the induction of the magnetizing field under mechanical stress gradually increasing from zero to the maximum value, then gradually decreasing to zero, is determined. A dependence is plotted wherein the values of the induction of the residual magnetization field are plotted on the ordinate axis, and the induction of the magnetizing field is plotted on the abscissa axis. The object is then demagnetized. As in the case of the effect of mechanical load, a magnetizing field of a given value and an alternating decaying magnetic field are applied thereto, wherein the magnetic field ensures that the induction of the residual magnetization field is equal to the value of the residual magnetization induction and is determined under mechanical stress. Intensity of the alternating decaying magnetic field is increased from zero to a maximum value and then decreased to zero, similarly to the mechanical stress increasing and decreasing. Measurements of the induction of the residual magnetization field are taken. A digitized axis is plotted parallel to the abscissa axis on the dependence plotted for the case of the effect of mechanical stress, wherein the values of the intensity of the alternating decaying magnetic field are plotted whereon the inductions of the residual magnetization fields were equal for both cases of magnetization of the ferromagnetic object.

EFFECT: simplified and increased productivity, increased accuracy of determination of the parameters of a magnetic field of residual magnetization when using an alternating decaying magnetic field instead of mechanical stress.

1 cl, 1 dwg