Fitting extrapolation method for saturation magnetization curve

Abstract

The embodiment of the invention provides a fitting extrapolation method for a saturation magnetization curve, and the method comprises the steps: carrying out the closed-loop measurement of a measurement sample, and obtaining middle and low field magnetization curve data; performing open-loop measurement on the measurement sample to obtain saturation magnetization intensity; fitting the medium and low field magnetization curve data to obtain a fitted curve; constructing an extrapolation function, and solving the extrapolation function according to the fitted curve and the saturation magnetization intensity; and splicing the extrapolation curve and the fitting curve to obtain a complete magnetization curve of the saturated magnetic field. The magnetization curve obtained by the method conforms to the physical law of the magnetization process of the strong magnetic material, the obtained complete magnetization curve is accurate and smooth, and the precision and efficiency of simulation calculation can be improved.

Description

technical field [0001] The invention relates to the technical field of electromagnetic calculation, in particular to a fitting extrapolation method suitable for saturation magnetization curves of ferromagnetic materials. Background technique [0002] The magnetization curve (B-H curve) is a necessary input condition for electromagnetic simulation calculation. In order to ensure the calculation accuracy, it is necessary to input the complete magnetization curve including the range of field strength. In some applications, the magnetic induction on the magnetizer is close to saturation. When the closed-loop measurement method is used to measure high field strength data, the data may be easily distorted due to the overheating of the sample. Therefore, the actual measurement range of the closed-loop measurement method is limited. The open-loop measurement method can load a high magnetic field strength, but the measurement error is relatively large, and the magnetization curve dat...

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Problems solved by technology

In related technologies, Straight Line Extrapolations (SLE for short), Law of Approach to Saturation Extrapolation (LAS for short), and Exponential Law Extrapolation (ELE for short) are commonly used. ) to extrapolate the magnetization curve. The above methods all use the closed-loop measurement data of the last measuring point to solve the undetermined coefficient in the extrapolation function. Since the error of a single measuring point may be relatively large, the extrapolation accuracy of the above method cannot be guaranteed

In addition, the above method does not perform noise reduction processing on the original closed-loop measurement data, and the closed-loop measurement curve and the extrapolated curve do not transition smoothly at the joint point, resulting in more iterations of simulation calculations and affecting calculation efficiency

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