Calculation Method of Abnormal Loss of Ferromagnetic Materials under Mixed AC and DC Excitation

Abstract

The invention discloses a method for calculating the abnormal loss of ferromagnetic materials under AC and DC mixed excitation, which comprises the following steps: when a single-frequency sinusoidal biased excitation is applied to the ferromagnetic material, the corresponding abnormal loss value is obtained by separation, and then by Extract the statistical parameters of the abnormal loss from the abnormal loss value; analyze the statistical parameters, and obtain the function of the statistical parameters required for multiple harmonic superposition and DC bias through numerical fitting; obtain the abnormal The improved expression of the magnetic field corresponding to the loss; based on the corresponding relationship between field and energy, and the improved expression, an improved abnormal loss calculation model is obtained. It improves the magnetic field expression corresponding to the abnormal loss by obtaining the functional form of the statistical parameters, and then obtains an improved abnormal loss calculation method based on the corresponding relationship between field and energy, which can not only be applied to the calculation of abnormal loss under complex excitation, but also make The calculation result is more accurate.

Description

technical field [0001] The invention relates to the technical field of ferromagnetic material loss calculation, in particular to a calculation method for abnormal loss of ferromagnetic material under different working conditions under the condition of AC and DC mixed excitation (with harmonic wave and DC bias). Background technique [0002] Ferromagnetic materials are widely used in the manufacture of electrical equipment due to their excellent properties such as high magnetic permeability and easy magnetization. As a common ferromagnetic material, silicon steel sheets are usually laminated to make large power transformers or The core of the reactor. The loss of ferromagnetic materials is generally composed of hysteresis loss, eddy current loss and abnormal loss. Since the abnormal loss is generated by the microscopic local eddy current induced by the movement of the magnetic domain wall, it is closely related to the dynamic magnetization process, and it is currently difficu...

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Problems solved by technology

[0004] Scholars at home and abroad have carried out a lot of research work on the hysteresis and loss characteristics of ferromagnetic materials under non-sinusoidal excitation, but the relevant research work is still not deep enough, and there are many limitations. At present, many studies only consider the DC bias or harmonics. However, for the loss of ferromagnetic materials under complex working conditions, only magnetic There are relatively mature calculation methods for hysteresis loss and eddy current loss, but the research and calculation of abnormal loss is still insufficient. Therefore, it is of great practical significance to find a suitable method to study abnormal loss and then complete the prediction of total loss.

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