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GB/T 13888-2024 English PDF

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GB/T 13888-2024: Methods of measurement of the coercivity(up to 160 kA/m) of magnetic materials in an open magnetic circuit
Status: Valid

GB/T 13888: Evolution and historical versions

Standard IDContents [version]USDSTEP2[PDF] delivered inStandard Title (Description)StatusPDF
GB/T 13888-2024English364 Add to Cart 4 days [Need to translate] Methods of measurement of the coercivity(up to 160 kA/m) of magnetic materials in an open magnetic circuit Valid GB/T 13888-2024
GB/T 13888-2009English154 Add to Cart 3 days [Need to translate] Method of measurement of the coercivity of magnetic materials in an open magnetic circuit Valid GB/T 13888-2009
GB/T 13888-1992English319 Add to Cart 3 days [Need to translate] Methods of measurement of the coercivity of magnetic materials in an open magnetic circuit Obsolete GB/T 13888-1992

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Basic data

Standard ID GB/T 13888-2024 (GB/T13888-2024)
Description (Translated English) Methods of measurement of the coercivity(up to 160 kA/m) of magnetic materials in an open magnetic circuit
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard K14
Classification of International Standard 29.030
Word Count Estimation 18,181
Date of Issue 2024-09-29
Date of Implementation 2025-04-01
Older Standard (superseded by this standard) GB/T 13888-2009
Issuing agency(ies) State Administration for Market Regulation, China National Standardization Administration

GB/T 13888-2024: Methods of measurement of the coercivity(up to 160 kA/m) of magnetic materials in an open magnetic circuit


---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Methods of measurement of the coercivity(up to 160 kA/m) of magnetic materi-als in an open magnetic circuit Measuring the coercivity of magnetic materials in an open magnetic circuit (up to 160 kA/m) method Methods of measurement of the coercivity (up to 160 kA/m) of magnetic materi﹘ als in an open magnetic circuit (IEC 60404-7..2019, Magnetic materials-Part 7.Methods of measurement of the coercivity (up to 160 kA/m) of magnetic materials in an open magnetic cir﹘ cuit, IDT) ICS 29.030 CCS K14 National Standard of the People's Republic of China Replace GB/T 13888-2009 Published on September 29, 2024, implemented on April 1, 2025 State Administration for Market Regulation The National Standardization Administration issued

Table of Contents

Preface ... Ⅲ 1 Scope ... 1 2 Normative references ... 1 3 Terms and Definitions ... 1 4 Method Principle ... 2 5 Samples ... 3 6 Solenoid ... 3 7 Compensation of geomagnetic field, static and dynamic magnetic noise fields ... 3 8 Magnetic shielding of the measuring area ... 4 9 Measurement ... 4 9.1 Magnetization ... 4 9.2 Measurement methods 4 9.2.1 General 9.2.1 General ... 4 9.2.2 Method A ... 4 9.2.3 Method B 6 9.3 Determination of coercive force 6 9.4 Reproducibility 7 10 Test Report ... 7 Appendix A (Normative) Precautions for measuring coercivity below 40 A/m for complex-shaped specimens and certain special cases ... 8 A.1 Coercivity less than 40 A/m 8 A.2 Coercivity measurement of complex shape specimens 8 A.3 Optimization of the Amplitude and Duration of Magnetization Intensity of Soft Magnetic Material Samples 8 A.4 Mechanical stress and temperature of the specimen in the solenoid 8 Appendix B (Informative) Method C using VSM (Vibrating Sample Magnetometer) 9 References ... 10

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1.Structure and drafting rules for standardization documents" Drafting is required. This document replaces GB/T 13888-2009 "Method for measuring the coercive force of magnetic materials in an open magnetic circuit" and is consistent with GB/T 13888-2009. In addition to structural adjustments and editorial changes, the main technical changes are as follows. Changed the applicable range for all magnetic materials from 0.2 A/m to 160 kA/m (see Chapter 1, Chapter 1 of the.2009 edition); a) The definition of "coercivity" has been changed, and the term and definition of "demagnetization" have been added (see 3.1, 3.2, Chapter 3 of the.2009 edition); b) The method of placing the probe in the solenoid in Method B and the description of the diagram have been changed (see Chapter 4, Chapter 4 of the.2009 edition); c) The requirements for test specimens have been changed (see Chapter 5, Chapter 5 of the.2009 edition); d) Added requirements for solenoids, geomagnetic fields, compensation for static and dynamic magnetic noise fields, and magnetic shielding of the measurement area (see 6, 7 and 8); e) The requirements for measurement have been changed (see Chapter 9, Chapter 6 of the.2009 edition); f) The reproducibility requirements have been changed, and the reproducibility requirements have been refined according to different measurement ranges (see 9.4, 6.4 of the.2009 edition); g) Added the coercivity measurement of complex shape samples, optimization of the magnetization intensity amplitude and duration of soft magnetic material samples, and solenoid Mechanical stress and temperature requirements of the test (see Appendix A, Appendix A of the.2009 edition); h) Added Method C—Measurement of the coercivity of magnetic materials in an open magnetic circuit using a vibrating sample strong magnetometer (see Appendix B). i) This document is equivalent to IEC 60404﹘7.2019 "Magnetic materials Part 7.Measurement of the coercivity of magnetic materials in an open magnetic circuit (up to 160 kA/m) method. The following minimal editorial changes were made to this document. The name of the standard is changed to "Method for measuring the coercive force (up to 160 kA/m) of magnetic materials in an open magnetic circuit"; Changed the note of Chapter 1.- Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents. This document was proposed by the China Electrical Equipment Industry Association. This document is under the jurisdiction of the National Technical Committee for Standardization of Electrical Alloys (SAC/TC 228). This document was drafted by. Baoshan Iron & Steel Co., Ltd., Shaoxing Kangjian Materials Technology Co., Ltd., Ningbo Xinglong Magnetic Technology Co., Ltd. Company, Mingguang Sanyou Electric Power Technology Co., Ltd., Beikuang Magnetic Material Technology Co., Ltd., Baotou Rare Earth Research Institute, Jiangxi Aite Magnetic Material Co., Ltd., Hunan Lianzhong Magnetic Instrument Co., Ltd., Guilin Electric Science Research Institute Co., Ltd., Hebei University of Technology, Beijing Goldwind Science and Technology Wind Power Equipment Co., Ltd., Hangzhou Quadrant Technology Co., Ltd., Nanning Bureau of China Southern Power Grid Ultra-High Voltage Transmission Company, Ningbo Zhaobao Magnetics Co., Ltd., Changsha Tianheng Measurement and Control Technology Co., Ltd., China University of Metrology, Guangdong Guirong Permanent Magnetic New Material Technology Co., Ltd., Ningbo Institute of Materials, Chinese Academy of Sciences Institute of Technology and Engineering, Dongguan Jianghe Magnetics Technology Co., Ltd., Southwest Institute of Applied Magnetism, Hangzhou Kede Magnetics Co., Ltd., Jiangsu CRRC Electric Co., Ltd., State Grid Smart Grid Research Institute Co., Ltd., Ningbo Yima Magnetics Co., Ltd., Sichuan Ruiteng Electronics Co., Ltd. Hunan Institute of Metrology and Testing, Ningbo Heli Magnetic Materials Technology Co., Ltd., Guangzhou Delong Electronic Devices Co., Ltd., Dongguan Yufeng Magnetoelectric Products Co., Ltd., Jiangsu Pulong Magnetoelectric Co., Ltd., Hunan Aerospace Magnetoelectric Co., Ltd., Ningbo Maitech Magnetic Materials Technology Co., Ltd. company. The main drafters of this document are. Shen Jie, Shi Kang, Huang Jianglun, Peng Peng, Li Qinghua, Fu Jianlong, Chen Jie, Hu Te, Zhao Haorong, Wang Jingqin, Li Shulin, Zhao Yi, Su Xiao, Lin Jianqiang, Zhou Xing, Wu Qiong, Tang Yu, Sun Yingli, Wang Jun, Xu Cheng, Wang Zhanguo, Wang Jianliang, Ding Yi, Ying Ying, Song Li, Xu Yu, Zhao Jiming, Wang Min, Xie Qingchun, Li Jun, Tan Chunlin, Huang Hao, Zhou Hanfeng, Huang Keke, Zhou Xinhua, Wang Jiahui, Tang Ling, Dai Jianqiang, Xiong Jun, Huang Jian. The previous versions of this document and the documents it replaces are as follows. First published in.2009 as GB/T 13888-2009; This is the first revision. - Measuring the coercivity of magnetic materials in an open magnetic circuit (up to 160 kA/m) method

1 Scope

This document describes a method for measuring the coercivity of magnetic materials in an open magnetic circuit. This document applies to magnetic materials with a coercivity between 0.2 A/m and 160 kA/m. Note. The magnetic materials in this document include soft magnetic materials (such as iron, low carbon steel, silicon steel, other steel, nickel-iron alloy, iron-cobalt alloy, Soft magnetic materials, amorphous soft magnetic materials, nanocrystalline soft magnetic materials) and hard magnetic materials [such as magnetostrictive alloys, permanent (hard) magnetic alloys, permanent (hard) magnetic Ceramics, other permanent (hard) magnetic materials, bonded (hard) magnetic materials][2]. For the measurement of coercivity below 40 A/m, high conductivity materials and non-elliptical specimens, the special measures in Appendix A shall be used.

2 Normative references

This document has no normative references.

3 Terms and definitions

The following terms and definitions apply to this document. The URLs for terminology databases used for standardization maintained by ISO and IEC are as follows. 3.1 Coercivity HkDJ By applying a reverse external magnetic field, the magnetic flux density or magnetic polarization and magnetization of the material are reduced from the magnetic saturation state value to zero. The coercive magnetic field strength in the material. Note. Use appropriate symbols as follows. HcB is the coercive force corresponding to the magnetic flux density, HcJ is the coercive force corresponding to the magnetic polarization intensity, and HcM is the coercive force corresponding to the magnetization intensity. The corresponding coercivity. The first two symbols replace HcB and HcJ respectively. [Source. GB/T 2900.60-2002, 2.1, modified] 3.2 Demagnetize The magnetic flux density of the magnetized material decreases along the demagnetization curve. Note. The coercivity HcB and the coercivity HcJ are distinguished based on the hysteresis loop defined in the B = f (H) coordinate system or the J = f (H) coordinate system (see Figure 1). Now, for materials with large incremental permeability in the B = 0 region, the difference between the coercivity HcJ and the coercivity HcB is negligible because. HcB = HcJ(1%00 0 H ) (1) Where. HcB ─ coercive force corresponding to magnetic flux density, in amperes per meter (A/m); HcJ ─ coercive force corresponding to magnetic polarization intensity, in amperes per meter (A/m); ΔB ─ the increment of magnetic flux density (B = 0 region), in Tesla (T);

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