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Analysis of Pulling-out Distance of Magnetic Moment of Permanent Magnet Material by Cdrawing Method It is Suggested to Use FE-2100MD Rare Earth Permanent Magnet Quality Parameter Tester
Release time:
2019-07-16
Source:
Www.fe2100.com
The magnetic flux (magnetic moment) of the sample is measured by the pulling method, which is related to the pulling distance and the coil constant of the coil and the magnetic moment (volume, shape and magnetic properties of the material) of the measured magnet. There are generally no clear regulations and detailed analysis, but based on experience to operate.
Adoptlift method testThe sample flux (magnetic moment) is related to the pulling distance and the coil constant of the coil and the magnetic moment (volume, shape and material magnetic properties) of the measured magnet. There are generally no clear regulations and detailed analysis,Operate according to experience. That is, the pulling distance of small magnetic steel is greater1mLeft and right, large magnets even require pulling out3mAbove.
in the adoptionone-dimensional Helmholtz coilWhen testing the magnetic moment of magnetic steel, the sample is generally turned over in the coil, and the corresponding test value is2The double magnetic moment is more convenient and accurate.
in usethree-dimensional Helmholtz coilThe component magnetic moment of the magnetic steel is detected, which is inconvenient to flip the magnet, and the pull-out distance needs to be determined after a certain analysis. The following example is for diameter160mmThe single-turn standard one-dimensional Helmholtz coil is orthogonal to the coil plane according to the direction of the main axis of the magnet sample, so as to maximize the induction relative to the coil, pull horizontally to different distances from the center of the coil, and observe the changes of magnetic flux and magnetic field strength (rightHelmholtzThe role of the upper and lower coils) for analysis, material selectionN35Magnetic steel.
1. magnetic field analysis
1Proportion table of coil flux and corresponding position (sum of magnetic flux of upper and lower coils)
| Sample N35(X,Y)
|
0m，40mm
|
0.5m，40mm
|
1.0m，40mm
|
1.5m，40mm
|
| Φ5*5mm
|
1.05002*10-6 Wb
|
-4.3034*10-9 Wb
|
-1.02932*10-9 Wb
|
-5.0048*10-10 Wb
|
| 1
|
4.098 ‰
|
0.980 ‰
|
0.477 ‰
|
|
| Φ10*10mm
|
8.4141*10-6 Wb
|
-3.4157*10-8 Wb
|
-8.2297*10-9 Wb
|
-4.0036*10-9 Wb
|
| 1
|
4.060 ‰
|
0.978 ‰
|
0.476 ‰
|
2. Ratio table of coil magnetic field value and corresponding position (the center point of upper and lower coil surface corresponds to magnetic field)
| Sample N35
|
0m，40mm
|
0.5m，40mm
|
1.0m，40mm
|
1.5m，40mm
|
| Φ5*5mm
|
284.6558uT
|
0.1072 uT
|
0.0258 uT
|
0.0125 uT
|
| 1
|
0.3766 ‰
|
0.0906 ‰
|
0.0439 ‰
|
|
| Φ10*10mm
|
2254.8 uT
|
0.8587 uT
|
0.2066 uT
|
0.1004 uT
|
| 1
|
0.3808 ‰
|
0.0916 ‰
|
0.0445 ‰
|
3. Distribution map of central magnetic field and displacement magnetic field:
4Conclusion: the magnetic field reduction ratio of different size samples to the same distance is basically the same.
2. calculation and analysis:
According to this, for simple calculation, we can determine the influence of the pull-out distance of the material on the true value of the test magnetic flux (magnetic moment) according to the total magnetic moment of the tested sample. According to the coil constant, the number of turns corresponding to the coil is determined to calculate the magnetic flux approximation result, and the removal distance is determined according to the minimum resolution required by the magnetic flux (magnetic moment).
Example: Continue to press160mmCoil, coil constant design accordingK=0.005cmCalculation, the magnetic moment resolution is required to reach0.1uWb*cmto consider. AdoptHunan Yongyi Technology Co., Ltd.Designed“FE-2100MDRare earth permanent magnet quality parameter tester"Calculate the magnetic flux (magnetic moment) for two specifications (see the interface below):
The magnetic flux and magnetic moment corresponding to the two magnets are obtained as follows:
1),Φ5*5mmSample: Φ=2.359mWb,M = 118 uWb * cm;
2),Φ10*10mmSample, Φ=18.85mWb,M = 942.5 uWb * cm;
According to the required resolution0.1uWb*cmcondition, I .e., Φ5*5mmSample required attenuation1000Times, Φ10*10mmrequired attenuation10000About times, refer to the magnetic flux induction attenuation ratio coefficient in "magnetic field analysis", Φ.5*5mmSample pull-out1mThat is, Φ10*10mmNeed to pull out more1.5m.
3. Suggestions: Users can directly referIn the "magnetic field analysis", the magnetic flux attenuation ratio is calculated and determined by itself according to the total magnetic moment of the tested magnetic steel and the minimum requirement of magnetic moment resolution. In the space where the environmental magnetic field is relatively stable, the measured magnetic steel can be horizontally pulled away to a certain distance, the magnetic steel can be turned over, and the magnetic flux change of the corresponding coil can be observed to determine (the calculation of this method can refer to the "magnetic field analysis" and the corresponding position ratio table), and the relevant calculation and analysis will not be carried out here.
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