IEC TR 61807-1999 PDF

Full title and description

IEC TR 61807:1999 — Magnetic properties of magnetically hard materials at elevated temperatures - Methods of measurement. This technical report provides standardized methods for measuring the magnetic properties of magnetically hard (permanent) materials when tested at temperatures above ambient, supporting consistent characterization of parameters such as remanence, coercivity and maximum energy product over a working temperature range.

Abstract

This Technical Report specifies test methods and measurement procedures for determining the magnetic properties of magnetically hard materials at elevated temperatures. It complements existing IEC documents that define classifications and properties of permanent magnet materials, and describes measurement arrangements, temperature control, and procedures for deriving temperature-dependent parameters (for example temperature coefficients of remanence and coercivity). The report is intended to ensure comparable, repeatable results when materials are evaluated outside room-temperature conditions.

General information

• Status: Published / Valid (Technical Report).
• Publication date: 20 October 1999 (first edition).
• Publisher: International Electrotechnical Commission (IEC).
• ICS / categories: 17.220.99, 29.030 (magnetic materials / measurement).
• Edition / version: Edition 1.0 (1999).
• Number of pages: 25 pages.

Entries above are drawn from the IEC publication record for TR 61807:1999.

Scope

The report covers recommended methods for measuring magnetic properties of magnetically hard (permanent) materials when those measurements are made at temperatures higher than normal room temperature. It addresses measurement arrangements (open and closed circuit where applicable), temperature control and measurement, derivation of temperature coefficients for key magnetic parameters, and the relationship of these methods to the existing IEC measurement standards for room-temperature testing. The objective is to allow manufacturers, test houses and researchers to quantify how permanent-magnet properties change with temperature across an intended operating range.

Key topics and requirements

• Measurement procedures for remanence (Br), coercivity (HcB / HcJ) and maximum energy product ((BH)max) at elevated temperatures.
• Guidance on temperature control and compensation when testing permanent magnets (sample conditioning, temperature sensors, and thermal stabilization).
• Methods to determine temperature coefficients (percent change per °C) for magnetic parameters over a specified temperature range.
• Reference and compatibility with IEC 60404 series measurement methods for room-temperature testing (open and closed magnetic circuits).
• Recommended reporting formats and test conditions to support reproducibility and comparison between laboratories.

Typical use and users

Primary users include permanent-magnet material manufacturers, motor and actuator designers, independent test laboratories, research institutions studying magnetic materials, and standards committees. The report is used when characterizing magnet performance for high-temperature applications (motors, sensors, aerospace/automotive environments, and energy systems) and when specifying temperature-dependent magnet parameters in datasheets or contractual test requirements.

Related standards

IEC TR 61807:1999 is closely related to the IEC 60404 series (which specifies classification and room-temperature measurement methods for magnetic materials), and to IEC 60404-8-1 (properties of permanent magnet materials). Other related documents include IEC 60404-5 and IEC 60404-7 (measurement methods for closed and open magnetic circuits) and subsequent / complementary technical reports and standards covering specialized magnetometry techniques. Cross-references to related IEC documents appear in the TR.

Keywords

permanent magnet, magnetically hard materials, magnetic properties, elevated temperature, remanence, coercivity, (BH)max, temperature coefficient, magnetometry, IEC TR 61807

FAQ

Q: What is this standard?

A: IEC TR 61807:1999 is a Technical Report from the International Electrotechnical Commission that provides recommended methods for measuring the magnetic properties of magnetically hard (permanent) materials at elevated temperatures.

Q: What does it cover?

A: It covers measurement procedures, temperature control and stabilization, determination of temperature coefficients for key magnetic parameters (e.g., Br, Hc, (BH)max), and recommended reporting to ensure reproducible results when testing at temperatures above room temperature.

Q: Who typically uses it?

A: Magnet manufacturers, component designers (motors, sensors, actuators), test laboratories, materials researchers, and standards committees use the report when evaluating or specifying magnet performance in elevated-temperature applications.

Q: Is it current or superseded?

A: IEC TR 61807:1999 is the first edition (1999). IEC’s publication record lists it as published in October 1999; national bodies list it as valid. Users should check with the IEC or their national standards body for any amendments or newer documents after 1999 before relying on it for regulatory or procurement decisions.

Q: Is it part of a series?

A: Yes — it complements the IEC 60404 series (magnetic materials) and fits within the IEC numbering series for electrical standards. It functions as a TR giving measurement-method guidance specifically for elevated-temperature testing of magnetically hard materials.

Q: What are the key keywords?

A: Permanent magnet, magnetically hard material, elevated temperature, remanence (Br), coercivity (Hc), maximum energy product ((BH)max), temperature coefficient, measurement methods, magnetometry.