Experimental method of using digital storage oscilloscope to observe alternating current magnetic hysteresis loop

Abstract

The invention discloses an experimental method of using a digital storage oscilloscope to observe an alternating current magnetic hysteresis loop, and belongs to the technical field of electromagnetic testing. The experimental method aims to reducing the distortion of testing the alternating current magnetic hysteresis loop, and improve the precision of testing dynamic magnetic parameters. According to the experimental method, firstly an alternating current triangular wave constant flow source circuit is designed, a magnet exciting coil is arranged as the load of the alternating current triangular wave constant flow source circuit, and the weave shape of magnetic field intensity H is enabled to be a triangular wave. The negative feedback sample resistance R1 of the alternating current triangular wave constant flow source circuit is the sample resistance of an exciting current, and the terminal voltage VH of the alternating current triangular wave constant flow source circuit is transmitted to the input end X of an oscilloscope. A test coil outputs voltage e2, and VB is obtained through the integration of an electronic integrator and is transmitted to the input end Y of the oscilloscope. The oscilloscope displays the alternating current magnetic hysteresis loop through XY scanning. In a measurement process, the rate of the change of H is enabled to be unchanged, the change rule of B is observed under the condition that H evenly changes, and the tested magnetic hysteresis loop is enabled be capable of reflecting the function relationship between the numerical values of B and H inside a sample better. The e2 replaces the VB to be sent to the input end Y of the oscilloscope, and a differential permeability mu d-H curve can be directly displayed.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic detection, and relates to an experimental method for observing an AC hysteresis loop of a soft magnetic material with a digital storage oscilloscope. Background technique [0002] The application of soft magnetic materials has been very extensive. Observing the AC hysteresis loop of soft magnetic materials and measuring the corresponding dynamic magnetic parameters are of great significance for understanding the magnetic properties of soft magnetic materials, rationally using soft magnetic materials and developing new soft magnetic materials. The oscilloscope method is the most commonly used method to observe the AC hysteresis loop and dynamic magnetic parameters of soft magnetic materials. Although with the continuous development of modern science and technology, there have been methods with higher measurement accuracy, the oscilloscope method has a simple measurement circuit structure, ...

AI Technical Summary

Problems solved by technology

But technically it is sometimes difficult to achieve the "B-sine" condition

For example, when the sample is AC magnetized to close to saturation, it is difficult to satisfy the "B sinusoidal" condition, resulting in large errors in measurement results in this region

It was proposed to measure the AC hysteresis loop and related dynamic magnetic parameters of soft magnetic materials under the condition of "B triangular wave". When the sample is magnetized by AC until its B value is close to saturation, it will also cause measurement errors because the condition of "B triangular wave" cannot be satisfied. Big

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