Method for quickly measuring magnetic characteristics of magnetic materials

Abstract

The invention relates to a method for quickly measuring magnetic characteristics of magnetic materials. The method includes providing a to-be-measured magnetic core with closed magnetic circuits, respectively winding excitation windings and detection windings on the to-be-measured magnetic core and serially connecting the excitation windings, capacitors and resistors with one another to form a closed circuit; electrifying the excitation windings with direct currents, applying direct-current voltages on the capacitors, enabling the to-be-measured magnetic core with the closed magnetic circuits, the capacitors and the resistors to meet damped oscillation circuit conditions and measuring current change procedures of the excitation windings and voltage change procedures of the detection windings to obtain direct-current magnetic flux density corresponding to direct-current magnetic field intensity of the magnetic core under direct-current conditions, a cluster of alternating-current magnetic hysteresis loops under different magnetic flux density conditions and magnetic core loss under the different magnetic flux density conditions. The method for quickly measuring the magnetic characteristics of the magnetic materials has the advantages of short measurement periods and easiness in acquiring magnetic characteristic curves during deep saturation.

Description

technical field [0001] The invention relates to the measurement of the magnetization characteristic curve of the magnetic material, in particular to a fast method for measuring the magnetic characteristic of the magnetic material. Background technique [0002] Accurate magnetic property measurement is an important measure for the research and development of magnetic materials. At present, the commonly used low-frequency AC measurement method and impact measurement method both use repeated measurements and then draw points to obtain the magnetization characteristic curve of magnetic materials. The above method has the disadvantages of long test period and difficulty in measuring the magnetization characteristic curve at deep saturation, as follows: [0003] (1) if figure 1 As shown, it is a schematic diagram of the low-frequency AC measurement principle, and the low-frequency AC source is used as its voltage source. [0004] When the switch S is closed, since the voltage s...

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Problems solved by technology

[0013] In the low-frequency measurement method, since only one closed hysteresis loop can be obtained in one measurement, in order to obtain an accurate magnetization curve of the magnetic material, it is necessary to perform multiple measurements, which makes the measurement operation tedious and complicated and takes a long time.

Moreover, because the current needs to be passed for a long time during the measurement, it is easy to cause serious heating of the magnetic material and cause it to fail to work normally, so the low-frequency AC measurement method cannot perform deep saturation measurement.

[0014] In the impact measurement method, although the single measurement time is short, in order to obtain a complete magnetization curve, multiple measurements are still required, resulting in a long measurement time

Moreover, due to the use of a DC voltage source, there is residual magnetism inside the magnetic material after each measurement, which does not achieve the effect of demagnetization, which will affect the later measurement results.

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