GB/T 43264-2023Measuring methods for the surface magnetic field distribution 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: China Institute of Metrology, Guilin Electrical Apparatus Research Institute Co:, Ltd:, Ningbo Xinglong Magnetic Technology Co:, Ltd: Division, Fujian Changting Jinlong Rare Earth Co:, Ltd:, Ningbo Coco Magnetics Co:, Ltd:, Sanyou Lianzhong Group Co:, Ltd:, Hangzhou Kede Magnetic Industry Co:, Ltd:, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo New Materials Testing and Evaluation Center Co:, Ltd:, Ningbo Songke Magnetic Materials Co:, Ltd:, Hangzhou Quadrant Technology Co:, Ltd:, Shaanxi Rui New Materials Co:, Ltd:, Ningbo Meguli Magnetoelectric Co:, Ltd:, Hebei University of Technology, China Jiliang University, Ningbo Ninggang Permanent Magnetic Materials Co:, Ltd:, Zhejiang Zhonghang New Material Technology Co:, Ltd:, Ningbo Dajinhua Magnetic Materials Co:, Ltd:, Ningbo Yunsheng Co:, Ltd:, Ningbo Zhaobao Magnetic Industry Co:, Ltd:, Zhejiang Songfa Composite New Materials Co:, Ltd:, Mingguang San You Electric Power Technology Co:, Ltd:, Dongguan Jinkun New Materials Co:, Ltd:, Tianjin Sanhuan Aona Technology Co:, Ltd:, Ningbo Xinlin Magnetic Industry Co:, Ltd: Company, Zhejiang Zhongke Magnetic Industry Co:, Ltd:, Dongyang Fushite Magnetic Industry Co:, Ltd:, Chongqing Wentong Mechanical and Electrical Co:, Ltd:, Ningbo Niland Magnetics Co:, Ltd:, Ningbo Huahui Magnets Co:, Ltd:, Ningbo Xinfeng Magnets Co:, Ltd:, Ganzhou Comprehensive Inspection and Testing Institute, Ningbo Shengshi Da Magnetic Industry Co:, Ltd:, Jiangxi Zhongshi New Materials Co:, Ltd:, Ningbo Yima Magnetic Industry Co:, Ltd:, and Ningbo Magnetic Materials Chamber of Commerce: The main drafters of this document: He Jian, Cui Defeng, Zhang Zhigao, Huang Keke, Zhang Jiulei, Feng Wei, Kang Ruxi, Ding Yue, Sun Yingli, Jiang Qiuxiao, Zhu Qing, Zhao Yi, Yang Ping, Zheng Mengjun, Wang Jingqin, Wu Qiong, Zhou Jianbin, Xu Jiacheng, Liu Haiyin, Peng Caicai, Lin Jianqiang, Zhao Chengwei, Peng Wusheng, Chen Liang, An Hailu, Li Guoqiang, Huang Yihong, Zhang Fangyuan, Chen Xi, Wang Haitao, Qian Yong, Dai Qiaoli, Xie Jianming, Li Wenjun, Tang Chengcheng, Ying Ying, Wu Yuezhen, Zhao Haorong, Huang Lanxia, Huang Jianglun, Ding Yong, Guo Yan: Test method for magnetic field distribution on permanent magnet surface

1 Scope

China's national methods for measuring the surface magnetic field distribution of permanent magnets. A magnet's bulk properties - remanence, coercivity, energy product - describe the material, and the surface field distribution describes the component. They are not the same thing, and it is the second that determines whether the magnet works in its application. A motor magnet with the right remanence but a field that varies along its length produces torque ripple; one whose magnetisation direction is not uniform produces a field pattern that the motor design did not assume; and a magnet with a demagnetised region from a manufacturing fault looks identical to a sound one on every bulk measurement. Mapping the field over the surface with a Hall probe or an array reveals all of it, which is why this is a production inspection rather than a laboratory characterisation.

This document describes the method of measuring the magnetic field distribution on the surface of permanent magnets using magnetic field detectors and magnetometers, including the selection of test points, measurement Apparatus, specimens, test procedures and data processing: This document is applicable to the surface magnetic field analysis of permanent magnets such as rare earth iron boron, rare earth cobalt, alnico, and permanent ferrite magnetized by various magnetization methods: Cloth detection:

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 1800:

1 Product Geometric Specification (GPS) Linear Dimensional Tolerance ISO Code System Part 1: Tolerances, Deviations and The basis for cooperation

GB/T 2900:60-2002 Electrical Terminology Electromagnetics JJF1059:

3 Terms and definitions

The terms and definitions defined in GB/T 2900:60-2002 and the following apply to this document: 3:

1 The surface of the permanent magnet where the poles are located:

Note: Anisotropic permanent magnets generally have surfaces that are perpendicular to or intersect with the orientation direction; isotropic permanent magnets generally have surfaces that are perpendicular to or intersect with the magnetization direction: 3:

2 Test distancetestdistance The vertical distance between the center of the effective sensing area of the magnetic field detector and the test surface:

4 Test principle

Use magnetic field detectors (probes), magnetometers and recording equipment to measure and record the magnetic field intensity in the specified direction on the surface of the permanent magnet to obtain The magnetic field strength at each test point on the surface of the permanent magnet:

5 Test point selection

Determine the measurement trajectory according to the geometry and magnetization direction of the permanent magnet, and select test points on the measurement trajectory: The pole surface of the permanent magnet is flat The test trajectories when Position, select several points on the entire 360° circle according to the principle of uniform diameter distribution: The schematic diagram of the test points is shown in Figure 6 to Figure 8: