Wideband rotating magnetic characteristic measuring system and method based on flexible excitation coil

Abstract

The invention discloses a wideband rotating magnetic characteristic measuring system and method based on a flexible excitation coil. The measuring system comprises a detection device, a digital signal processing unit, a power amplifier, and a differential amplification circuit. The digital signal processing unit is connected with the power amplifier and the differential amplification circuit. The detection device is connected with the power amplifier and the differential amplification circuit. The detection device comprises a three-stage frustum-shaped excitation winding, a sample holder, a horizontal structure magnetic ring, a center pillar, a buckle, a corner pillar and a base. The excitation winding of the measuring system is designed as a multi-stage frustum-shaped structure to realize a wideband magnetic characteristic test. The measuring method comprises first giving an excitation signal with a low frequency, gradually increasing the frequency of the excitation signal until the sample is saturated; replacing the excitation winding connection mode after the sample is completely measured in the excitation winding connection method, and repeating the measurement process until the highest detection band.

Description

technical field [0001] The invention relates to a broadband rotating magnetic characteristic measuring system, in particular to a broadband rotating magnetic characteristic measuring system and a measuring method based on a flexible excitation coil. Background technique [0002] The rotating magnetic characteristic measurement system reflects the magnetic characteristics of the sample to be tested through the detected B-H curve. The digital signal processing unit generates two mutually orthogonal excitation signals in the X direction and the Y direction around the sample, and generates a rotating magnetic field in the center of the sample. The sample uses the built-in B probe to collect the B signal, and the H sensor coil is attached to the upper and lower sides to collect the H signal. The acquisition of the B-H detection signal is realized through the digital signal processing unit. At present, in the existing rotating magnetic characteristic detection device, in order t...

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Problems solved by technology

Application No. 201010010119.9 discloses a two-dimensional magnetic property single-piece measurement system and measurement method for electrical steel sheets. The detection device in this measurement system uses mostly a single-segment cylindrical structure for the excitation coil, and the slot fill rate of the device is relatively low. , is not conducive to the optimal design of the iron core, it is difficult to realize the detection of magnetic characteristics in a wide frequency range, which limits the application range of magnetic materials, and the single-section cylindrical excitation coil winding wiring method is single, the influence of distributed capacitance is large, and the excitation performance is deteriorated

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