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Device and method for measuring magnetism of permanent magnet material at high temperature

A permanent magnet material and magnetic technology, which is applied in the field of high-temperature measurement of the magnetism of permanent magnet materials, can solve the problems of low energy, slow magnet heating speed, and affecting measurement results, and achieve the effect of high energy and fast heating speed

Active Publication Date: 2021-07-09
CHINA JILIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a device and method for measuring the magnetism of permanent magnet materials at high temperature, so as to solve the technical problems of slow magnet heating speed, low energy and affecting measurement results

Method used

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  • Device and method for measuring magnetism of permanent magnet material at high temperature
  • Device and method for measuring magnetism of permanent magnet material at high temperature
  • Device and method for measuring magnetism of permanent magnet material at high temperature

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Taking NdFeB permanent magnet as sample 13, measure sample 13 at 22 o C (room temperature), 100 o C, 130 o C and 150 o At C, the magnetic properties of the NdFeB permanent magnet: first cut the sample 13 into a block magnet with a size of 5×5×5 mm; the specific measurement steps are as follows:

[0052] 1. Use a magnetic punching machine to punch sample 13 to saturation at 9T;

[0053] 2. Fix the two heat-absorbing sheets 10 on the front and rear surfaces of the sample 13 respectively, fix them with the clamp 8, place the sample 13 between the two electromagnet pole heads 7, adjust the distance between the electromagnet pole heads 7, and use the electromagnetic The iron pole 7 compresses the sample 13;

[0054] 3. Preferably use a femtosecond pulse laser with a wavelength of 800-850nm and a frequency of 76MHz. Adjust the laser beam so that two beams of laser light are irradiated on the front and rear surfaces of the sample 13. The spot diameter is 4mm and the laser ...

Embodiment 2

[0061] Take samarium cobalt permanent magnet as sample 13: measure sample 13 at 500 o At C, the magnetic properties of the samarium-cobalt permanent magnet: first cut the sample 13 into a block magnet with a size of 5×5×10 mm, and the specific measurement steps are as follows:

[0062] 1. Use a magnetic punching machine to punch sample 13 to saturation at 7T;

[0063] 2. Fix the two heat-absorbing sheets 10 on the front and rear surfaces of the sample 13 respectively, fix them with the clamp 8, place the sample 13 between the two electromagnet pole heads 7, adjust the distance between the electromagnet pole heads 7, and use the electromagnetic The iron pole 7 compresses the sample 13;

[0064] 3. Preferably use a continuous laser, adjust the laser beam so that two beams of laser light are irradiated on the front and rear surfaces of the sample 13, the spot diameter is 4 mm, and the laser intensity is 100 mW. The temperature sensor 6 on the heat absorbing sheet 10 is used to m...

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Abstract

The invention belongs to the field of magnetic measurement, and discloses a device and a method for measuring the magnetism of a permanent magnet material at a high temperature, and the device comprises a laser, a power controller, a light beam controller, a temperature controller, a magnetic measurement unit, a temperature sensor and electromagnet pole heads, and the electromagnet pole heads are divided into an upper electromagnet pole head and a lower electromagnet pole head which are respectively used for clamping the upper surface and the lower surface of a sample. Heat absorption pieces are fixed to the front surface and the rear surface of a sample respectively, the temperature of the heat absorption pieces is measured through a temperature sensor, the sample is heated through laser, and the temperature of the heat absorption pieces is adjusted by adjusting the proportion of light beams irradiated to the heat absorption pieces on the front surface and the rear surface of the sample through a power controller and a light speed controller through a temperature controller, and the magnetism of the sample is detected by using a magnetism detection unit. The laser heating mode is adopted, the heating speed is high, energy is high, the magnetism of the permanent magnet material under the high-temperature condition can be effectively measured, and the measurement result cannot be affected.

Description

technical field [0001] The invention belongs to the field of magnetic measurement, in particular to a device and method for measuring the magnetic properties of permanent magnetic materials at high temperature. Background technique [0002] With the development of science and technology, the requirements for the performance of permanent magnets are getting higher and higher, especially in the field of space and high-performance power equipment. Permanent magnets are required to work under high temperature conditions and have good magnetic properties. However, at present There are still some deficiencies in the measurement of the magnetic properties of permanent magnet materials under high temperature conditions. [0003] At present, there are two main measurement methods for high-temperature magnets: open-circuit measurement and closed-circuit measurement. The open-circuit measurement mainly uses measurement equipment such as VSM and PPMS, which has high requirements for exp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/12
CPCG01R33/12G01R33/14G01R33/1215G01R33/007G01R33/02
Inventor 吴琼杨杭福葛洪良俞能君泮敏翔黄霞妮王子生
Owner CHINA JILIANG UNIV
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