BS EN 10332:2003 – Magnetic materials — Permanent magnet (magnetically hard) materials — Methods of measurement of magnetic properties
1 Scope
This European standard specifies the method of measurement of the magnetic flux density, magnetic polarization and the magnetic field strength and also the determination of the demagnetization curve and recoil line of permanent magnet materials, such as those specified in IEC 60404-8-1, the properties of which are presumed homogeneous throughout their volume.
The performance of a magnetic system is not only dependent on the properties of the permanent magnet material but also on the dimensions of the system, the air-gap and other elements of the magnetic circuit. The methods described in this standard refer to the measurement on the magnetic properties in a closed magnetic circuit simulating a ring.
2 Normative references
This European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text, and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies (including amendments).
IEC 60050-121:1998, International Electrotechnical Vocabulary – Part 121: Electromagnetism.
IEC 60050-151:2001, International Electrotechnical Vocabulary – Part 151: Electrical and magnetic devices.
IEC 60050-221:1990, International Electrotechnical Vocabulary) – Chapter 221: Magnetic materials and components.
3 Terms and definitions
For the purposes of this European Standard, the terms and definitions given in IEC 60050-121:1998, IEC 60050-151:2001 and IEC 60050-221:1990 apply.
For permanent magnet materials this standard deals with both the coercivity HcB (the coercivity related to the magnetic flux density) and the intrinsic coercivity HcJ (the coercivity related to the magnetic polarization).
The measurements specified in this standard are for both the magnetic flux density, B, and the magnetic polarization, J, as a function of the magnetic field strength, H. These quantities are related by the following equation :
where
B is the magnetic flux density, in teslas ;
µ 0 is the magnetic constant = 4 10-7, in henry per metre ;
H is the magnetic field strength, in amperes per metre ;
J is the magnetic polarization, in teslas.
BS EN 10332:2003 – Magnetic materials — Permanent magnet (magnetically hard) materials — Methods of measurement of magnetic properties