Article | REF: D2102 V1

Permanent magnets - Applications and prospects

Authors: Luc LECHEVALLIER, Jean-Marie LE BRETON, Philippe TENAUD, Antoine MOREL, Serge BRASSARD

Publication date: May 10, 2007

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1. General

1.1 The different types of permanent magnets

As mentioned in [D 2 101] , there are currently four main families of materials that account for the bulk of applications on the permanent magnet market.

These four families are, in order of appearance: Alnico, hard ferrites, samarium-cobalt and neodymium-iron-boron.

Alnico alloys based on aluminum, nickel, cobalt and iron first appeared in the 1930s. Today, they are used less and less, due to their modest magnetic properties and the high cost of cobalt. Thanks to their excellent thermal stability, they still have a few rare applications, in the high-temperature sector and on the measuring equipment market....

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Converting electrical energy into mechanical energy

Economic data

1. Worldwide production

The permanent magnet market was estimated at US$4.4 billion in 1998, over US$5 billion in 2000 and US$8 billion in 2007. It should continue to grow, reaching US$11 billion in 2010.

With their modest magnetic performance but low cost, ferrites remain the magnet family that dominates the world market, both in terms of tonnage (90%) and sales (around half of the global...

Bibliography

References

(1) - ROSSIGNOL (M.), YONNET (J.P.) - Les aimants permanents. Les matériaux magnétiques et leurs applications : Magnétisme II - . Presses Universitaires de Grenoble (1999).
(2) - - Notes d'applications TDK. - Ferrites, NdFeB, SmCo (2005)....

Standardization

Association française de normalisation AFNOR

http://www.afnor.org

Magnetic materials – Method for measuring the coercive field of magnetic materials in an open magnetic circuit (classification index: C28-921). - NF EN 10330 - (08-03)
Magnetic materials – Materials for permanent magnets (magnetically hard) – Methods for measuring magnetic...

International Electrotechnical Commission IEC

http://www.afnor.org

Magnetic materials – Part 1: Classification. - CEI 60404-1 - (08-00)
Matériaux magnétiques. Septième partie : méthode de mesure du champ coercitif des matériaux magnétiques en circuit magnétique ouvert. - CEI 60404-7 - (01-82)
Modification 1 à la publication CEI 60404-8-1 d'avril 2001....