PD IEC TR 63304:2021

This standard PD IEC TR 63304:2021 Permanent magnet (magnetically hard) materials. Methods of measurement of magnetic properties in an open magnetic circuit using a superconducting magnet is classified in these ICS categories:

• 17.220.20 Measurement of electrical and magnetic quantities
• 29.030 Magnetic materials

This Technical Report describes the general principle and technical details of the methods of measurement of the DC magnetic properties of permanent magnet materials in an open magnetic circuit using a superconducting magnet (SCM).

This method is applicable to permanent magnet materials, such as those specified in IEC 60404-8-1, the properties of which are presumed homogeneous throughout their volume.

There are two methods:

• the SCM-Vibrating Sample Magnetometer (VSM) method;

• the SCM-Extraction method.

This document also describes methods to correct the influence of the self-demagnetizing field in the test specimen on the demagnetization curve measured in an open magnetic circuit. The magnetic properties are determined from the corrected demagnetization curve.

NOTE These SCM-methods can determine the magnetic properties of permanent magnet materials with coercivity higher than 2 MA/m. The methods of measurement in a closed magnetic circuit specified in IEC 60404-5 can lead to significant measurement error due to saturation effects in the pole pieces of yoke for the magnetic materials with coercivity higher than 1,6 MA/m (see IEC 60404-5).