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GB/T 47344-2026Durability test method for permanent magnets under multi-field coupling - Elevated temperature and reverse magnetic field (English PDF)

永磁体多场耦合耐久性测试方法　高温和反向磁场

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

March 31, 2026

Implementation date

October 1, 2026

Scope

GB/T 47344-2026 is the English-translated version of 永磁体多场耦合耐久性测试方法　高温和反向磁场.

GB/T 47344-2026 is the Chinese standard "Durability test method for permanent magnets under multi-field coupling - Elevated temperature and reverse magnetic field".

Its scope clause reads: This document describes a method for measuring the durability of permanent magnets under high temperature and multi-field coupling of reverse magnetic fields, and specifies the corresponding specimens and measuring equipment.

Setup, data processing, uncertainty, and test reports. This document applies to the durability of permanent magnets such as rare earth iron boron, rare earth cobalt, rare earth iron nitrogen, AlNiCo, and permanent magnet ferrites under high-temperature reverse magnetic fields. The test. Its clauses include terms and definitions; measurement principle.

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Document preview — GB/T 47344-2026

National Standard of the People's Republic of China

ICS: 29.030
Classification: K 14

Issued by: State Administration for Market Regulation; Standardization Administration of the PRC

Preface
1.Scope
2 Normative References
3.Terms and Definitions
4.Measurement Principle
5 Samples
6 Measuring devices
6.1 High-Temperature Reverse Magnetic Field Durability Test Apparatus
6.2 Magnetic Dipole Torque Measuring Device
7 Measurement Steps
7.1 Initial Magnetic Dipole Moment Test
7.2 High-Temperature Reverse Magnetic Field Durability Test
7.3 Magnetic dipole moment test after high-temperature reverse magnetic field durability test
8 Data Processing
9 Uncertainty
10 Test Reports
Appendix A (Informative). Different Physical Meanings of Irreversible Losses in Permanent Magnets
Appendix C (Informative) Magnetic Dipole Moment Measurement Apparatus Using the Continuous Rotation Method
Appendix D (Informative) High Temperature Reverse Magnetic Field Durability Test Conditions
References

1 Scope

This document describes a method for measuring the durability of permanent magnets under high temperature and multi-field coupling of reverse magnetic fields, and specifies the corresponding specimens and measuring equipment.

Setup, data processing, uncertainty, and test reports.

This document applies to the durability of permanent magnets such as rare earth iron boron, rare earth cobalt, rare earth iron nitrogen, AlNiCo, and permanent magnet ferrites under high-temperature reverse magnetic fields.

The test.

2 Normative references

The contents of the following documents, through normative references within the text, constitute essential provisions of this document. Dated citations are not included.

For references to documents, only the version corresponding to that date applies to this document; for undated references, the latest version (including all amendments) applies.

This document.

GB/T 1184-1996 Geometric Tolerances - Tolerances Without Specified Values

GB/T 2900.60 Electrical Engineering Terminology. Electromagnetism

GB/T 3217 Magnetic Test Methods for Permanent Magnet (Hard Magnetic) Materials

GB/T 9637 Electrical Engineering Terminology. Magnetic Materials and Components

GB/T 24270 Method for measuring the temperature coefficient of magnetic properties of permanent magnet materials

GB/T 38437 Method for measuring the magnetic dipole moment of ferromagnetic material samples by pull-out or rotation

3 Terms and Definitions

The terms and definitions defined in GB/T 2900.60, GB/T 3217, GB/T 9637, GB/T 24270, and GB/T 38437, as well as the following terms and definitions, shall apply.

Used in this document.

3.1

A permanent magnet, after being subjected to a specified high temperature and a magnetic field opposite to its magnetization direction for a period of time, maintains its magnetic dipole moment.

ability.

3.2

After the permanent magnet was removed from the high-temperature and reverse magnetic field durability test environment and allowed to return to room temperature, the portion of its magnetic dipole moment that could not be recovered was...

The ratio before the experiment, expressed as a percentage (%).

Note. In the industrial field, this is commonly referred to as irreversible magnetic flux loss, see Appendix A.

4 Measurement Principle

A high-temperature reverse magnetic field durability testing device was used to test a saturated permanent magnet under high temperature and constant reverse magnetic field conditions.

After a period of time, a high-temperature reverse magnetic field durability test was conducted.

Note. Based on the characteristics of the service environment of permanent magnets, a vibration field is added on this basis, see Appendix B.

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 16 pages — is available in the English PDF.

Referenced standards

Normative references

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