Electrical steel sheet hysteresis characteristic prediction method and system based on reversible magnetization component

Abstract

The invention discloses an electrical steel sheet hysteresis characteristic prediction method and system based on a reversible magnetization component, and relates to the technical field of magnetic material hysteresis modeling. The method comprises the steps of: acquiring variable residual magnetism intensities under different magnetic field intensities; fitting the variable residual magnetism intensities, and deriving a calculation formula of an irreversible magnetization component according to a normalized residual magnetism function obtained by fitting; calculating an irreversible magnetization component value corresponding to a limit hysteresis loop according to the calculation formula; substituting the irreversible magnetization component value into an irreversible magnetization component function, and calculating the irreversible magnetization component value corresponding to the residual hysteresis loop except the limit hysteresis loop; calculating a reversible magnetization component value according to the irreversible magnetization component value corresponding to the limit hysteresis loop; and summing a reversible magnetization component function obtained by fitting thereversible magnetization component value and the irreversible magnetization component function, and performing reverse normalizing to obtain hysteresis loops of the electrical steel sheet under different magnetic densities. The method can quickly and accurately predict the hysteresis characteristics of the electrical steel sheet.

Description

technical field [0001] The invention relates to the technical field of hysteresis modeling of magnetic materials, in particular to a method and system for predicting hysteresis characteristics of electrical steel sheets based on reversible magnetization components. Background technique [0002] Electrical steel sheets are widely used in transformers, motors and other power equipment iron cores to form the main magnetic circuit due to their high magnetic permeability and low loss performance. It is the most critical part that directly affects the electrical performance of power equipment. Simulation is of great significance to the optimal design of power equipment. For example, the hysteresis characteristic simulation of electrical steel sheets will directly affect the accuracy of the core magnetic field and loss estimation of power equipment. In actual engineering, in terms of modeling the magnetic field of power equipment, most of them ignore the hysteresis effect of elect...

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Problems solved by technology

The classic static Preisach hysteresis model is widely used in the simulation of the hysteresis characteristics of electrical steel sheets in actual engineering due to its high calculation accuracy. However, it does not take into account the reversible magnetization part of the electrical steel sheet during the physical magnetization process. The rectangular hysteresis operator of the irreversible magnetization component approximates the magnetization process of magnetic materials. The model lacks perfect physical meaning and cannot accurately predict the hysteresis characteristics of electrical steel sheets.

The existing generalized moving Preisach model describes the reversible magnetization process in it, which leads to a significant increase in the complexity of the model, parameter identification (identification of the parameters in the Preisach model) is more cumbersome and complicated, and the output involves complex integrals, resulting in the physical meaning of the model. The efficiency of solving the hysteresis characteristics of electrical steel sheets is greatly reduced

At present, there is no Preisach model based on the reversible magnetization component that is easy to identify

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