GB/T 43266-2023Methods for measuring the angular deviation of magnetization of permanent magnets (English PDF)

Foreword

This document complies with the provisions of GB/T 1:1-2020 "Standardization Work Guidelines Part 1: Structure and Drafting Rules of Standardization Documents" Drafting: Please note that some content in this document may be subject to patents: The publisher of this document assumes no responsibility for identifying patents: This document is proposed by the China Electrical Equipment Industry Association: This document is under the jurisdiction of the National Electrical Alloys Standardization Technical Committee (SAC/TC228): This document was drafted by: Ningbo Xinglong Magnetic Technology Co:, Ltd:, China Institute of Metrology, Guilin Electrical Apparatus Research Institute Co:, Ltd: Division, Zhejiang Songfa Composite New Materials Co:, Ltd:, Fujian Changting Jinlong Rare Earth Co:, Ltd:, Ningbo New Materials Testing and Evaluation Center Co:, Ltd:, China Jiliang University, Hangzhou Kede Magnets Co:, Ltd:, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo Coco Magnets Co:, Ltd: Co:, Ltd:, Ningbo Songke Magnetic Materials Co:, Ltd:, Hangzhou Quadrant Technology Co:, Ltd:, Hebei University of Technology, Sanyou Lianzhong Group Co:, Ltd:, Dongguan Jinkun New Materials Co:, Ltd:, Shaanxi Rui New Materials Co:, Ltd:, Ningbo Ninggang Permanent Magnetic Materials Co:, Ltd:, Ningbo Zhaobao Magnetic Industry Co:, Ltd:, Ningbo Dajinhua Magnetic Materials Co:, Ltd:, Ningbo Yunsheng Co:, Ltd:, Ningbo Meiguli Magnetoelectric Co:, Ltd:, Ningbo Niland Magnetic Co:, Ltd:, Ningbo Magnetic Materials Chamber of Commerce, Ningbo Shengshida Magnetic Co:, Ltd:, Ningbo Huahui Magnetic Co:, Ltd:, Zhejiang Yundu New Materials Technology Co:, Ltd:, Tianjin Sanhuan Aona Technology Co:, Ltd:, Zhejiang Zhongke Magnetic Industry Co:, Ltd:, Dongyang Fushite Magnetic Industry Co:, Ltd:, Chongqing University of Science and Technology, Ganzhou Comprehensive Inspection and Testing Institute, Zhejiang Ant Magnetic Materials Co:, Ltd:, Jiangxi Zhongshi New Materials Co:, Ltd: Company, Anhui Hanhai New Materials Co:, Ltd: The main drafters of this document: Huang Keke, He Jian, Cui Defeng, Zhao Chengwei, Zhang Jiulei, Xie Kaifeng, Wu Qiong, Wang Zhanguo, Sun Yingli, Feng Wei, Zhu Qing, Zhao Yi, Wang Jingqin, Kang Ruxi, Chen Liang, Wang Xiaojun, Zhou Jianbin, He Qijun, Liu Haiyin, Ren Daxing, Zheng Mengjun, Wang Haitao, Wu Yuezhen, Zhang Qiuming, Qian Yong, Zheng Biaobing, An Hailu, Huang Yihong, Li Yuhang, Ma Yilong, Xiao Longfei, Lian Jiangbin, Chen Siyuan, Liu Jingcheng, Zhao Haorong, Huang Lanxia, Pan Yuqin, Ke Peiling, Huang Jianglun, Guo Yan: Measurement method of magnetic declination angle of permanent magnets

1 Scope

China's national methods for measuring the angular deviation of magnetization in permanent magnets. A sintered magnet is anisotropic: its powder is aligned in a field before pressing, so the material has an easy axis, and the magnet is magnetised along it. The angular deviation is the difference between the direction the magnet is actually magnetised in and the direction the design intended, and it arises from imperfect alignment during pressing or from the magnetising fixture. Its effect is straightforward and costly. In a motor, a magnet whose field is tilted by even a couple of degrees contributes a component of flux that does no useful work and does produce cogging and losses, and in an assembly of many magnets the deviations do not cancel. Measuring it requires resolving the field direction rather than its magnitude, which is why it needs its own method alongside the surface field mapping.

This document describes methods for measuring the magnetic declination of permanent magnets: This document is suitable for the measurement of magnetic declination angle of permanent magnets such as rare earth iron boron, rare earth cobalt, alnico, and permanent ferrite:

2 Normative reference documents

The contents of the following documents constitute essential provisions of this document through normative references in the text: Among them, the dated quotations For undated referenced documents, only the version corresponding to that date applies to this document; for undated referenced documents, the latest version (including all amendments) applies to this document: GB/T 2900:

60 Electrical Terminology Electromagnetics GB/T 2900:

83 Electrical terminology Electrical and magnetic devices

GB/T 9637 Electrical Terminology Magnetic Materials and Components

GB/T 38437 Method for measuring the magnetic dipole moment of ferromagnetic material samples by pulling or rotating JJF1059:

3 Terms and definitions

The following terms and definitions as defined in GB/T 2900:60, GB/T 2900:83 and GB/T 9637 apply to this document: 3:

1 After the permanent magnet is magnetized, the direction of the actual magnetic dipole moment j (actual magnetization direction) is the same as the direction of the designed ideal magnetic dipole moment jz (ideal magnetization direction): direction) (see Figure 1):

Note: The magnetic declination angle of permanent magnets is generally generated during material preparation or processing of finished products: Figure