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Comparison of Several Measuring Devices for Permanent Magnetic Materials at Home and Abroad
Release time:
2019-07-15
Source:
Www.fe2100.com
To do a good job in the magnetic material measuring device, it is necessary to carry out continuous horizontal comparison with the measuring device in the same industry. Hunan Yongyi Technology Co., Ltd. has been carrying out this work.
To do a good job of measuring devices for magnetic materials, it is necessary to make continuous horizontal comparisons with measuring devices in the same industry,Hunan Yongyi Technology Co., Ltd.The work has been carried out, and has been carried out at present.Measurement of AC Magnetic Properties of Soft Magnetic MaterialswithIwatsu BH SY8218 (Iwasaki, Japan),Silicon steel measuring device与Electrical Steel Tester MPG（Dr.Brockhaus Messtechnik Gmbh）、permanent magnet material measuring deviceWith Permagraph C (Magnet-Physik Dr.Steingroever Gmbh), NIM-2000 (Chinese Academy of Metrology) a large number of comparison tests, so as to correctly evaluate their own equipment and peer equipment, in order to further improve the accuracy and repeatability of their own products, to achieve the localization of test equipment!For the magnetic performance measurement equipment of permanent magnet materials, from 2015 to 2016,Hunan Yongyi Technology Co., Ltd.The following tests were carried out, namely, self-checking repeatability and peer comparison.
1.FE-2100H test repetitive self-test
1. Measurement of rare earth permanent magnet
|
Serial Number |
Br(T) |
Hcb (kOE) |
Hcj(kOe) |
BHmax(MGOe) |
|
1 |
1.224 |
11.51 |
13.42 |
35.36 |
|
2 |
1.224 |
11.50 |
13.40 |
35.31 |
|
3 |
1.225 |
11.51 |
13.42 |
35.37 |
|
4 |
1.224 |
11.51 |
13.38 |
35.36 |
|
5 |
1.224 |
11.50 |
13.42 |
35.30 |
|
6 |
1.225 |
11.52 |
13.40 |
35.39 |
|
7 |
1.225 |
11.52 |
13.42 |
35.39 |
|
Average |
1.2244 |
11.51 |
13.409 |
35.354 |
|
Repeatability |
±0.090% |
±0.087% |
±0.21% |
±0.13% |
2. Measurement of permanent ferrite
|
Serial Number |
Br(T) |
Hcb (kOE) |
Hcj(kOe) |
BHmax(MGOe) |
|
1 |
0.4279 |
3.963 |
4.214 |
4.437 |
|
2 |
0.4279 |
3.966 |
4.216 |
4.450 |
|
3 |
0.4280 |
3.966 |
4.217 |
4.450 |
|
4 |
0.4281 |
3.965 |
4.214 |
4.450 |
|
5 |
0.4277 |
3.962 |
4.214 |
4.438 |
|
6 |
0.4281 |
3.965 |
4.216 |
4.448 |
|
Average |
0.42795 |
3.9645 |
4.2152 |
4.4455 |
|
Repeatability |
±0.058% |
±0.053% |
±0.044% |
±0.17% |
2.Peer equipment comparison work
1, 2015 andZhejiang Institute of MetrologyPurchase FE-2100H for blind sample assessment of test accuracy and repeatability (test sample N38SH each S test ten times comparison)
|
Test parameters |
Magot forcePermagraphC-750 |
Hunan EternalFE-2100H |
||
|
Average |
Repeatability |
Average |
Repeatability |
|
|
Br |
1.277 T |
0.04% |
1.276 T |
0.16% |
|
HcB |
968.2 kPa |
0.06% |
965.9 kHz/kg |
0.20% |
|
Hcj |
1733 AU/K |
0.24% |
1736 AM/M |
0.10% |
|
BHmax |
308.0 kJ/m3 |
0.17% |
307.7 kJ/m3 |
0.37% |
2, 2016 andNingbo Institute of MetrologyTest and compare the three purchased equipment
1) Materials:N38H-1#, the test temperature is not indicated, and the test is carried out at the same time, and the test is carried out under saturated magnetization.
|
Test Manufacturer |
Br（T) |
Hcb（Attention) |
Hcj（Attention) |
BHmax（kJ/m3) |
|
German Magrid Magnetoelectric |
1.230 |
937.7 |
1431 |
286 |
|
1.231 |
938.7 |
1429 |
286 |
|
|
Hunan Province Eternal Science and Technology |
1.226 |
943.3 |
1442 |
286.8 |
|
1.223 |
942.1 |
1442 |
285.6 |
|
|
Chinese Academy of Metrology |
1.217 |
925.3 |
1379 |
279.1 |
|
1.218 |
926.0 |
1379 |
279.6 |
2）、N38H-2#, the test temperature is not indicated, and the test is carried out at the same time, and the test is carried out under saturated magnetization.
|
Test Manufacturer |
Br（T) |
Hcb（Attention) |
Hcj（Attention) |
BHmax（kJ/m3) |
|
German Magrid Magnetoelectric |
1.194 |
905.5 |
1483 |
267 |
|
1.196 |
907.8 |
1477 |
269 |
|
|
Hunan Province Eternal Science and Technology |
1.184 |
905.8 |
1493 |
265.4 |
|
1.188 |
908.3 |
1504 |
266.7 |
|
|
Chinese Academy of Metrology |
1.183 |
894.1 |
1426 |
261.3 |
|
1.181 |
893.5 |
1435 |
260.4 |
3）、Compare the deviation calculation with the Margo force equipment as standard equipment.
|
Test Manufacturer |
Br（T) |
Hcb（Attention) |
Hcj（Attention) |
BHmax（kJ/m3) |
|
German Magrid Magnetoelectric |
1.0 |
1.0 |
1.0 |
1.0 |
|
Hunan Province Eternal Science and Technology |
0.9938 |
1.0026 |
1.0105 |
0.9968 |
|
Chinese Academy of Metrology |
0.9893 |
0.9862 |
0.9655 |
0.9751 |
4）、German Mageri Magnetoelectric,Hunan Province Eternal Science and Technology,Chinese Academy of MetrologyThree test repeatability (due to the small number of tests, repeatability cannot fully represent the long-term repeatability of the test equipment)
|
Test Manufacturer |
Br（%) |
Hcb（%) |
Hcj（%) |
BHmax（%) |
|
German Magrid Magnetoelectric |
0.063 |
0.090 |
0.138 |
0.180 |
|
Hunan Province Eternal Science and Technology |
0.145 |
0.094 |
0.186 |
0.225 |
|
Chinese Academy of Metrology |
0.063 |
0.036 |
0.159 |
0.130 |
Analysis of 3. Test Equipment
1, through two times with the German Mag force magnetoelectric test equipment comparison, and its original data into the FE-2100H test software for analysis,Permagraph C- 750 is not so excellent as to be widely spread in the industry. In the actual operation process, I feel its superiority mainly comes frommagnetic flux meterHowever, it has not been shown as much as possible in permanent magnet measurement (permanent magnet measurement is relatively strong in flux induction, and the test deviation caused by drift will become secondary), so NIM-2000H surpass the Permagraph C- 750 in the repeatability of two measurements. Of course, if more than a few measurements, will get a more convincing reference;
2. In the process of horizontal comparison of the test data, it is found that the measurement difference of Hk parameter is relatively large, which is mainly because the influence of pole head saturation on the collapse of the two-quadrant demagnetization curve cannot be solved in the industry so far. The test data of Zhejiang Institute of Metrology adopts pure iron pole head, which obviously collapses the curve, thus being 5.5% smaller than the FE-2100H of Yongyi Technology Co., Ltd, in the absence of a complete solution to the problem of collapse of the demagnetization curve, it is recommended that the IEC standard and GB standard unify the specification of the electromagnet pole head material, otherwise it cannot meet a more comprehensive assessment of the material;
3, in the Zhejiang Institute of Metrology and Ningbo Institute of Metrology on the three samples of the test comparison work, German Mageli equipment and.Hunan Province Eternal Science and TechnologyThe equipment is in good agreement, and the data deviation of the Chinese Academy of Metrology is large, which needs to be paid attention.
4, from the remanence results analysis of correlation, can be more clearly foundmagnetic flux meterThere is a difference in calibration, which is consistent with the problems found during my two visits to users to install magnetic measurement equipment. The year before last, Arnold in Shenzhen found that the calibration difference between the magnetic flux meter of the Chinese Academy of Metrology and the permanent science and technology magnetic flux meter was 0.5 percent lower. This year, the magnetic flux meter ratio of the Chinese Academy of Metrology was found in Shougang, Yantai.Eternal TechnologyThe calibration difference of the magnetic flux meter is 0.6 per cent lower than that of the German Magree magnetic flux meter by 0.9 per cent.
5、magnetic flux meterandmagnetometer(Our equipment provides two test methods) Equipment manufacturers never refer to standard samples for standard traceability, and all use instruments to calibrate the equipment. The magnetic flux and magnetic field strength of Yongyi Technology Co., Ltd. are respectively traced to the volt-second generator produced by Walker Company and the gaussmeter produced by Bell, with calibration accuracy of 0.2 and 0.25 respectively. The magnetic flux calibration is between the Chinese Institute of Metrology and the German Magali magnetoelectric.
The judgment of the manufacturing level of the magnetic performance test equipment for permanent magnet materials depends most on the level of test repeatability. At present, the test repeatability of the China Institute of Metrology is relatively good. If more experimental data are used to prove the repeatability experiment, it can be said that the NIM-2000 produced by the China Institute of Metrology is the better magnetic measurement test equipment in the industry, because the difference of magnetic flux calibration can be corrected.
While thanking the relevant staff of Zhejiang Institute of Metrology and Ningbo Institute of Metrology who cooperated with us to complete the relevant permanent magnetic test comparison work, we also thank the relevant staff of Ningbo Institute of Ordnance Science, WISCO Iron and Steel Design and Research Institute and Shanghai University National high quality Silicon Steel Joint Laboratory who cooperated with us to complete the relevant soft magnetic test comparison work. At the same time, thanks to the continuous efforts of the company's scientific research and technical personnel!
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