Spatial high-frequency rotation magnetic characteristic measuring system and measuring method

Abstract

The invention discloses a spatial high-frequency rotation magnetic characteristic measuring system and a measuring method. The system comprises a three-axis orthogonal shimming excitation structure, an excitation signal generating device, a power amplifier, a differential amplification circuit for a precision instrument, and a data acquisition and processing unit; the excitation signal generatingdevice is connected with the power amplifier; the differential amplification circuit for a precision instrument is connected with the data acquisition and processing unit; the three-axis orthogonal shimming excitation structure is connected with the power amplifier and the differential amplification circuit for a precision instrument; the three-axis orthogonal shimming excitation structure includes an x-axis iron core group, a y-axis iron core group, a z-axis iron core group, and an excitation winding; the x-axis iron core group, the y-axis iron core group and the z-axis iron core group each are composed of two identical C-shaped iron cores; two pole heads of one C-shaped iron core are respectively connected with two pole heads of the other C-shaped iron core, so that a double-C-shaped iron core structure can be formed; and the three iron core groups are arranged in a three-dimensional 90-degree staggered manner; and the winding positions of the excitation winding on the double-C-shaped iron core structures are identical.

Description

technical field [0001] The invention relates to the field of magnetic characteristic measurement, in particular to a space high-frequency rotating magnetic characteristic measurement system and a measurement method. Background technique [0002] The magnetic characteristic detection system is mainly composed of an excitation device, a magnetic characteristic sensing device and a data acquisition system. The excitation device is a key part of magnetizing the material to be tested according to the required technology, and is used to realize the dynamic magnetic characteristic simulation of the magnetic material under actual working conditions. According to the development of magnetic characteristic detection technology, the excitation device mainly has two types of structures: one-dimensional alternating excitation structure and two-dimensional planar rotation excitation structure. These two excitation structures can only realize unidirectional magnetization or planar rotation...

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Problems solved by technology

[0005] The yoke with a single-core structure has only one core to excite the sample, which will cause the air gap around the sample to be uneven, and a uniform magnetic field cannot be formed in the sample. The magnetized area in the center of the sample is small, and the electrical signals induced at different positions are different. The electrical signal fluctuates relatively large, resulting in relatively large measurement errors, making the measurement results inaccurate

[0006] The magnetic characteristic detection device in the prior art is made of silicon steel sheets. Compared with nanocrystalline materials, silicon steel sheets have lower saturation magnetic permeability, higher core loss at high frequencies, and severe heat generation. The excitation winding adopts single-strand Enameled wire winding, when the frequency is high, the winding impedance is large, and when the current is passed through for excitation operation, the core loss and winding loss are relatively high, and the magnetic characteristic detection of the sample under the high-frequency three-dimensional space rotating magnetic field cannot be realized, which limits the magnetic material. scope of use

The literature (Zhang Xinliang, Wang Youhua, Chen Long, Wang Miao, Yang Xinlei. Research on key issues in the measurement of two-dimensional high-frequency magnetic properties [J]. China Test, 2017,43(03):74-77+82) studies the plane The measurement of rotating magnetic properties, the magnetic circuit is asymmetrical, the magnetic flux leakage is serious, and the magnetic field formed is uneven; at the same time, this document does not mention the magnetic properties measurement of the space rotating magnetic field, and it is impossible to measure the magnetic properties of ferromagnetic materials in the space rotating magnetic field in actual working conditions

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