1. general statement
Using the electromagnet pole surface embedded coil method to test the permanent magnet material is an application-oriented technical scheme designed according to the BH characteristics of the current industrial test permanent magnet material. Since the actual size and shape of the sample do not need to be considered during the test, there is no need to wind or set a fixed B/J coil on the magnet, and only the test sample needs to be completely covered on a coil embedded in the pole head, the test is convenient, The repeatability is good, and there is a certain market prospect. Through the measurement experiment of different thickness samples, the samples with certain thickness are properly corrected, and the standard geometric size samples in the uniform area of the pole head are directly tested, which has high accuracy and can meet the test of permanent magnet ferrite production enterprises, and the test is fast and convenient. For the measurement of large samples, such as magnetic separation of large squares, large speaker magnetic ring, etc., can meet the accurate measurement of Br/Hcj/BHmax, Hcb conversion is complex, dynamic characteristics of uncertain factors, there is no good method to solve. Hunan Yongyi Technology Co., Ltd.
Automatic measuring device for FE-2100H permanent magnetic materials
According to the test method of national standard GBT 3217-2013, microcomputer control and A/D and D/A technologies are adopted to automatically set the test magnetic field and flux range, and automatically correct the integral zero drift and Hall probe nonlinearity. Various fixed B/J coils can be configured according to user test requirements, and different measurement methods such as flat pole head, contracted pole head, heating pole head and tile pole head can also be selected according to test requirements.
2. Design Principle of Nondestructive Testing of Permanent Magnet Materials Using Pole Head Buried Coil Method
3. Experimental Verification Results of Nondestructive Testing of Permanent Magnet Materials Using the Pole Head Buried Coil Method
1. The magnet is completely in the gap of the pole head, and the sample diameter is 25.7mm and the thickness is 10mm.
1-1, standard method
1-2, pole head embedded coil method
| Project |
Br(T) |
Hcb (kOE) |
Hcj(kOe) |
BHmax(MGOe) |
| Standard BH Test Method |
0.4358 |
4.078 |
5.375 |
4.632 |
| Non-destructive testing method of pole head |
0.4351 |
4.105 |
5.42 |
4.666 |
| Deviation |
-0.16% |
0.66% |
0.84% |
0.73% |
2. The magnet is completely in the gap of the pole head, and the dry pressing homogeneous material is tested. The sample diameter is 13.32mm and the thickness is 12mm.
2-1. Standard Law
2-2, pole head embedded coil method
| Project |
Br(T) |
Hcb (kOE) |
Hcj(kOe) |
BHmax(MGOe) |
| standard law |
0.2285 |
1.885 |
3.585 |
1.096 |
| Pole head embedded coil method |
0.2281 |
1.884 |
3.593 |
1.092 |
| Deviation |
-0.19% |
-0.056% |
0.23% |
0.39% |
3. Magnet out of gap, sample size 85mm x 65.5mm x 18mm.
3-1, standard method
3-2, pole head embedded coil method
| Project |
Br(T) |
Hcb (kOE) |
Hcj(kOe) |
BHmax(MGOe) |
| standard law |
0.3747 |
0.3032 |
0.3173 |
3.355 |
| Pole head embedded coil method |
0.3741 |
0.3124 |
0.3170 |
3.385 |
| Deviation |
-0.19% |
3.0% |
-0.1% |
0.98%
|
|
4. summary:
through experiments,
Hunan Yongyi Technology Co., Ltd.Have the ability to accept the design of material manufacturing enterprises to add embedded coil pole head test standard samples to the existing test equipment, reduce labor intensity and speed up the test efficiency. For enterprises testing large samples, if the equipment adopts the double integral test method, they can undertake the transformation of the equipment for rapid test comparison of products (Hcb cannot ensure accuracy). New users (material production type for testing standard samples) can be used recommend.
(1) Different tooling can be selected according to sample testing needs;
(2) Provide flat pole head, shrinking pole head, heating pole head or tile pole head required for testing;
(3) Provide a fixed J-coil that matches the sample.
4. summary:
Through experiments, Hunan Yongyi Technology Co., Ltd. has the ability to accept the design of material manufacturing enterprises to add embedded coil pole head test standard samples to the existing test equipment, reduce labor intensity and speed up the test efficiency. For enterprises testing large samples, if the equipment adopts the double integral test method, it can undertake the transformation of the equipment for rapid test comparison of products (Hcb cannot ensure accuracy). New users (material production type for testing standard samples) can be used recommend.
