Test system and measurement method for rotary magnetic property of nano-crystalline

Abstract

The invention discloses a test system and measurement method for the rotary magnetic property of nano-crystalline, and belongs to magnetic property measurement equipment of nano-crystal materials. Thetest system comprises an NI industrial control computer, a LabVIEW signal generation and collection board, a rotary magnetic property tester, a power amplifier, an impedance matching capacitance box,a B-H composite magnetic sensor and a differential amplification circuit. Two orthogonal magnetic circuits are of a symmetric double-yoke structure, the two magnetic circuits implement excitation independently, and alternate excitation in any direction within a circle, oval and plane can be carried out according to practical condition. The B-H composite magnetic sensor is composed of two H coilsand four probes, the two H coils vertical to the window direction can be wound around a detachable square inner-ring PCB substrate to test the magnetic field intensities H in the two orthogonal directions, the four steel probes are mounted on an outer PCB substrate pairwise, and every two probes in the same pair test the flux density B in one direction. Weld points and lead fixing holes are designed in the outer PCB substrate. Shimming protective layers are arranged in the two sides of a test sample respectively, the uniformity of a test area is ensured, and the test efficiency is improved.

Description

technical field [0001] The invention relates to a nanocrystal rotating magnetic characteristic detection device, in particular to a nanocrystal rotating magnetic characteristic testing system and a measuring method. Background technique [0002] There is a rotating magnetic field at the T-shaped junction of the nanocrystalline core three-phase high-frequency transformer, resulting in rotational loss. The existing ring sample test method cannot test the rotating magnetic field, and it is difficult to accurately calculate the loss of the nanocrystalline core three-phase high-frequency transformer. Therefore, it is necessary to build a test device for the rotational magnetic properties of nanocrystals. The detection of the rotating magnetic properties of nanocrystals is based on Faraday's law of electromagnetic induction and the eddy current effect under an alternating magnetic field to obtain the magnetic field signal in the sample. The sample is excited by two pairs of axial...

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Problems solved by technology

[0003] In the prior art magnetic characteristic detection device, the magnetic circuit structure adopts a single C-ring structure, and the magnetic circuit symmetry is poor; the field winding adopts a rectangular structure with low window utilization, and the problem of magnetic flux leakage is prominent; High core loss, serious heating problem

The detection device in the prior art cannot realize the simulation of the rotating magnetic characteristics at high frequency

[0004] In the prior art magnetic characteristic detection device, the B and H sensors have low integration and require a large uniform magnetic field area, and the B sensor adopts the method of punching holes, which is easy to destroy the magnetic characteristics of the sample; it is easy to cause wire insulation in the process of wire perforation If the H sensor is placed above the B sensor, the distance between the H sensor and the sample surface will increase, which will increase the test error, and if it is not placed above the H coil, it will increase the area of ​​the uniform magnetic field area.

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