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GB/T 28869.2-2023: Cores made of soft magnetic materials - Measuring methods - Part 2: Magnetic properties at low excitation level
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Cores made of soft magnetic materials - Measuring methods - Part 2: Magnetic properties at low excitation level
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GB/T 28869.2-2023
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Basic data | Standard ID | GB/T 28869.2-2023 (GB/T28869.2-2023) | | Description (Translated English) | Cores made of soft magnetic materials - Measuring methods - Part 2: Magnetic properties at low excitation level | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | L19 | | Classification of International Standard | 29.100.10 | | Word Count Estimation | 27,242 | | Date of Issue | 2023-11-27 | | Date of Implementation | 2024-06-01 | | Older Standard (superseded by this standard) | GB/T 9632.1-2002 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 28869.2-2023: Cores made of soft magnetic materials - Measuring methods - Part 2: Magnetic properties at low excitation level
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ICS 29:100:10
CCSL19
National Standards of People's Republic of China
Partially replaces GB/T 9632:1-2002
Measurement method for magnetic cores made of soft magnetic materials
Part 2: Magnetic properties at low excitation levels
(IEC 62044-2:2005,IDT)
Published on 2023-11-27
2024-06-01 Implementation
State Administration for Market Regulation
Released by the National Standardization Administration Committee
Table of contents
Preface III
Introduction IV
1 Scope 1
2 Normative references 1
3 Terms and Definitions 1
4 symbols 2
5 Environmental conditions 3
6 General rules for magnetic permeability measurement methods 3
6:1 Related influencing factors 3
6:2 Assembly of multi-component composite core 3
7 General rules for loss measurement at low magnetic flux density 4
7:1 Components of losses 4
7:2 Clamping 4
8 Normalization of magnetism 4
9 Inductance measurement 4
9:1 General 4
9:2 Determination of test signal 5
9:3 Determination of measuring coil 6
9:4 Clamping of the magnetic core during testing 7
9:5 Inductance measurement under DC excitation 7
9:6 Parameters related to core geometry 8
9:7 Magnetic material parameters 9
10 minus 10
11 Temperature coefficient of magnetic permeability10
11:1 Sample 10
11:2 Measurement procedure 11
12 Losses at low flux density11
12:1 Overview 11
12:2 Measuring coil 11
12:3 Residual loss and eddy current loss measurement 12
12:4 Hysteresis loss measurement 12
13 Total harmonic distortion 12
13:1 Sample 12
13:2 Measuring instruments and circuits 13
13:3 Measurement procedure 13
13:4 THDF measured coil and AL value 14
13:5 Material properties---THDF 14
14 Curie temperature 14
15 Nominal impedance, parallel conductance and insertion loss15
15:1 Overview 15
15:2 Measurement procedure 15
15:3 Nominal impedance15
15:4 Parallel conductance 15
Appendix A (Informative) Reduction 17
A:1 Overview 17
A:2 Method Principle 17
A:3 Sample 17
A:4 Timer 17
A:5 Measurement procedures 17
A:6 Calculation 18
Appendix B (informative) THD test conditions 19
B:1 Purpose 19
B:2 Determination of the number of coil turns when the magnetic flux density is maximum 19
B:3 Determination of the number of coil turns when CCF is minimum 20
Reference 21
Figure 1 Schematic diagram of the influence of self-resonant frequency on measured inductance value 5
Figure 2 THDF measurement circuit 13
Figure 3 Curie temperature 15
Figure B:1 Functional relationship between magnetic flux density and number of coil turns19
Figure B:2 Functional relationship between the number of coil turns and the circuit correction factor (CCF) 20
Table 1 Correspondence between magnetic core structure, measurement frequency, inductance factor (AL) and number of coil turns 6
Table 2 THDF measured sample coils and their AL values 14
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:
This document is Part 2 of GB/T 28869 "Measurement Methods for Magnetic Cores Made of Soft Magnetic Materials": GB/T 28869 has been released
The following parts:
---Part 1: General specifications;
---Part 2: Magnetic properties at low excitation levels;
---Part 3: Magnetic properties at high excitation levels:
This document partially replaces GB/T 9632:1-2002 "Measurement Methods for Magnetic Cores of Inductors and Transformers for Telecommunications" and is consistent with GB/T 9632:1-
Compared with:2002, in addition to structural adjustments and editorial changes, the main technical changes are as follows:
---Changed the scope of the file (see Chapter 1, Chapter 1 of the:2002 edition);
---Added terms and definitions (see Chapter 3);
---Added symbols (see Chapter 4);
---Changed the content of third harmonic distortion (see Chapter 13, Chapter 12 of the:2002 edition);
---Added the measurement method of Curie temperature (see Chapter 14);
---Added nominal impedance, parallel conductance and insertion loss (see Chapter 15):
This document is equivalent to IEC 62044-2:2005 "Measurement methods for magnetic cores made of soft magnetic materials - Part 2: Low excitation levels"
Magnetic Properties":
This document has made the following minimal editorial changes:
---Incorporated the errata content of IEC 62044-2:2005/COR1:2021, the outer margins of the involved clauses are marked with vertical
Straight double lines (‖) are marked;
---Changed the errors in 9:5:3 and 9:5:5b), changing "Chapter 6" to "Chapter 5";
---Added references:
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 Ministry of Industry and Information Technology of the People's Republic of China:
This document is under the jurisdiction of the National Magnetic Components and Ferrite Materials Standardization Technical Committee (SAC/TC89):
This document was drafted by: Ninth Research Institute of China Electronics Technology Group Corporation:
The main drafters of this document: Li Wei, Peng Qinggui, Gao Xiaoqin, Wang Huili, and Gan Pi:
The previous versions of the documents replaced by this document are as follows:
---GB/T 9632-1988, GB/T 9632:1-2002:
Introduction
GB/T 9632:1-2002 "Measurement Method for Magnetic Cores of Inductors and Transformers for Communications", as the basic standard of the soft magnetic industry, is widely used by enterprises:
Widely adopted: GB/T 9632:1-2002 is equivalent to IEC 60367-1:1982, which has been replaced by IEC 62044 series
standard, so it is revised according to the structural relationship of the new IEC standard: IEC 62044-1:2002 has been converted into GB/T 28869:1-
2012: GB/T 28869 "Measurement Method for Magnetic Cores Made of Soft Magnetic Materials" consists of three parts:
---Part 1: General specifications: The purpose is to establish the general rules to be followed for the various possible measurement methods of magnetic cores made of soft magnetic materials:
Use principles:
---Part 2: Magnetic properties at low excitation levels: The purpose is to establish the magnetic and electrical properties of cores operating at low excitation levels
Normative guidelines for energy measurement methods:
---Part 3: Magnetic properties at high excitation levels: The purpose is to specify the power dissipation and amplitude magnetism of closed-circuit cores at high excitation levels:
conductivity measurement method:
The revision of GB/T 28869 is conducive to the test methods of magnetic cores made of soft magnetic materials being in line with international standards, and the test results are internationally recognized:
And expand export trade of related products:
Measurement method for magnetic cores made of soft magnetic materials
Part 2: Magnetic properties at low excitation levels
1 Scope
This document applies to magnetic cores made of magnetic oxides or metal powders used primarily in communications equipment and similar technologies
Inductors and transformers in electronic instruments that operate at low excitation levels:
Some of the methods described in this document are also applicable to cores used in other electronic components:
This document gives normative guidelines for drafting methods for measuring the magnetic and electrical properties of magnetic cores: This document is limited to various possible tests
The general principles followed by the method and list the factors to be considered when describing the test method in the technical specification:
Note: All formulas in this document are in International System of Units (SI) units: When using multiples and divisors, it is advisable to introduce powers of 10, inductance and inductance factor unit conversion
The system is as follows: 1H=109nH:
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 28869:1-2012 Measurement methods for magnetic cores made of soft magnetic materials Part 1: General specifications (IEC 62044-1:
2002,IDT)
parts)
Note: GB/T 20874-2007 Calculation of effective parameters of magnetic parts (IEC 60205:2001, IDT)
3 Terms and definitions
The following terms and definitions apply to this document:
3:1
THD
The voltage waveform distortion caused by the nonlinear relationship between the magnetic flux density and magnetic field strength of the ferrite core is expressed as follows:
THD=20lg(Vm/Vf) (1)
In the formula:
Vm= ∑
n=2
V2n (2)
Vn ---The amplitude of the nth harmonic;
Vf ---The amplitude of the fundamental wave:
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