GB/T 43264-2023 in English
VALIDMeasuring methods of the surface magnetic field distribution for permanent magnets
- Issued on:2023-11-27
- Implemented on:2024-06-01
- File Format:PDF
- Delivery:Within 1 day
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《GB/T 43264-2023永磁体表面磁场分布测试方法》由TC228（全国电工合金标准化技术委员会）归口，主管部门为中国电器工业协会。
Introduction
1. Background and significance of standard formulation
With the widespread application of permanent magnetic materials in electronics, automobiles, energy and other fields, it is essential to accurately measure the magnetic field distribution on their surface. The formulation of GB/T 43264-2023 fills the gap in domestic standards in this field and provides a scientific basis for the quality control and performance evaluation of permanent magnets.
2. Test principles and methods
Magnetic field detector is used in combination with magnetometer to generate a magnetic field distribution curve by measuring the magnetic field intensity in a specified direction on the surface of the permanent magnet. The selection of the test point is based on the geometric shape and magnetization direction of the permanent magnet.
| Test parameters | Measurement range | Accuracy requirements |
|---|---|---|
| Peak magnetic field intensity | 0 ~ 800 kA/m | ±1.0% |
| Pole width (length or angle) | Depending on magnet shape | ±0.05 mm |
3. Comparative analysis of standard framework
This standard is applicable to a variety of permanent magnet materials, including NdFeB, rare earth cobalt, AlNiCo and permanent magnet ferrite. The comparison is made through the following dimensions:
| Magnet type | Scope of application | Test requirements |
|---|---|---|
| NdFeB | High coercivity application | Pole plane parallelism ≤ Grade 9 |
| Rare earth cobalt | Use in high temperature environment | Surface roughness ≤3.2 μm |
4. Implementation suggestions and application cases
Enterprises should choose appropriate test platforms and detectors according to product characteristics. For example, Hall elements are suitable for testing planar pole surfaces, while rotating platforms are suitable for annular or cylindrical magnets.
Case: Application of NdFeB permanent magnets in electric vehicles
A certain automobile manufacturer used this standard to test the NdFeB poles of the motor to ensure the uniformity of its magnetic field distribution. The motor efficiency was significantly improved by calculating the relative uniformity (formula see standard).
5. Test environment and data processing
The test should be carried out in an environment with a temperature of 23°C ±3°C to ensure that there is no AC magnetic field interference. Data acquisition needs to synchronously record the magnetic field strength and position information, and generate the magnetic field distribution curve through an algorithm.
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