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Influence of magnetic anisotropy on flux density changes in dynamo steel sheets

Mazgaj W., Szular Z., Warzecha A.

Archives of Electrical Engineering

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2015

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Vol. 64, nr 1

81-88

EN

Magnetic measurements, carried out by means of the Epstein frame, have shown that most typical dynamo steel sheets have certain anisotropic properties. In numerical analysis, anisotropic properties are taken into account with the use of the special function of the grain distribution in the given dynamo sheet. For engineering purposes, it is desirable to assess the influence of these properties on the changes of the magnetic flux density in typical dynamo steel sheets, especially during the rotational magnetization. For this purpose, measurements of the flux density changes and field strength changes in the circular-shaped samples of two selected typical dynamo sheets were performed. These measurements were carried out for several values of the current flowing in windings which generated the axial or rotational magnetic field in the test dynamo sheet. The influence of the magnetic anisotropy on the magnetization process was briefly discussed for both types of the magnetization processes.

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Power losses in typical dynamo steel sheets during the axial magnetization

Banach A., Mazgaj W.

Maszyny Elektryczne : zeszyty problemowe

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2014

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Nr 4(104)

195--199

EN

Magnetization processes in typical dynamo steel sheets can have different character. In parts of the dynamo sheets, which refer to the stator core of induction motors, the magnetization process has rotational character, first of all elliptical character. The second kind of magnetization processes, the axial magnetization occurs mainly in stator teeth. It is worth underlining that dynamo sheets are also applied in cores of small power transformers. The paper deals with power losses depending on the frequency and on the maximum value of the flux density in dynamo sheets. In the analysis, the anisotropic properties of these sheets were taken into consideration. Special attention was paid to the losses depending on the magnetization direction on the sheet plane. Measured power losses in selected dynamo sheets were compared with results obtained on the basis of analytical formulas.

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Influence of Magnetic Anisotropy on the Rotational Magnetization in Typical Dynamo Steel Sheets

Mazgaj W., Szular Z., Warzecha A.

Maszyny Elektryczne : zeszyty problemowe

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2014

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Nr 3(103)

173--177

EN

Most of typical dynamo steel sheets have anisotropic properties. These properties were determined on the basis of magnetic measurements carried out by means of the Epstein frame for several specified directions of selected dynamo sheets. For engineering purposes, it is desirable to assess the influence of these properties on the magnetization process in dynamo steel sheets, especially during the rotational magnetization. This assessment can be performed with the use of the appropriate model of the rotational magnetization, which was briefly presented in the paper. Anisotropic properties were taken into account with the use of the special function of the grain distribution in the given dynamo sheet. Analysis was performed for the axial and rotational magnetization for a few selected dynamo sheets. The influence of the magnetic anisotropy on the magnetization process was briefly discussed for both types of the magnetization processes. Measurements of the rotational magnetization were compared with numerical calculation results.