Demagnetization effect of rectangular and ring-shaped samples madeof electrical sheets placed in a stationary magnetic field

The method of summation used for calculating magnetic-field strength is applied to determine the demagnetization coefficient of rectangular and ring-shaped samples made of an anisotropic electrical sheet and of isotropic silicon and silicon-free sheets. The calculations refer to a standard strip used in an Epstein test (of its shortening and contraction) and to the sample which is usually placed in an anisometer, i.e. in a homogeneous external magnetic field. Changes in the demagnetization coefficient are determined for different crystallographic orientation in the above-mentioned sheets. The relation between the magnetization direction of the ring-shaped sample and its demagnetization is affected. In the case of electrical steel strips, the results allow the determination of the real magnetization characteristics for the sample     

Anisotropy of demagnetization in rectangular electrical sheetsamples placed in a stationary magnetic field

The method of summation used for calculating magnetic field distribution was applied to determine the anisotropy of demagnetization of rectangular samples made of anisotropic and isotropic electrical sheets. The calculations refer to a standard strip used in an Epstein test and to the samples placed in homogeneous. external magnetic field. Changes in the demagnetization anisotropy were determined for different degrees of crystallographic orientation in the materials. In the case of electrical strip sheets, the results make it possible to determine the real B-H magnetization characteristic for the material, which is also very important in many cases for instrumentation     

Anisotropy of mechanical properties in cold rolled electrical sheets of goss texture

Electrical sheets display beneficial properties and are thus good constructional materials for magnetic circuits of transformers and electrical machines and equipment. The anisotropy of mechanical properties is brought about by sheet crystalline structure and texturing. The phenomenon was analyzed quantitatively. The anisotropy of mechanical properties in cold rolled electrical sheets was correlated with the anisotropy of magnetic and electrical properties.     

The anisotrophy of coercive force in cold-rolled goss-texture electrical sheets

The value of coercive force constitutes an important materals constant, and an unfavorable effect of Hcchanges should be taken into consideration in the course of exploitation of electrical machines and equipment. The values of coercive force of anisotropic and isotropic electrical sheets have been presented. It has been found that the crystalline structure and the degree of texture bring forth the anisotropy of coercive force, i.e., the changes of Hcvalue depending on the magnetization directions. The applied measuring method gives results which are exact enough (error δmax< 3 percent) and reproducible. The minimal value of coercive force has been found to be in direction [001] and the maximal value in direction [110], and not in direction [111]. The anisotropy for the directions is correlated with the anisotropy of mechanical properties (the number of bends) and the magnetostriction.