There are ferrites with curie point near room temperature. Kirk -----Original Message----- From: Gal Janos [mailto:jgal@xxxxxxxxxx] Sent: Thursday, October 03, 2002 4:03 AM To: femm@xxxxxxxxxxxxxxx Subject: RE: [femm] Temperature dependence of PM materials Well, I can not suggest you PM material with strong temperature dependence, maybe it is not exist. Just an idea: how about to use soft magnet in the magnetic circuit, which have the curie point at the required temperature. As I remember the weller soldering tools are using the curie point of the insert to regulate the temperature. A sort of inserts is available, with curie point between 200 and 300 C. I know it is very high temperature for you, but probably lower curie point materials are available. Regards, Janos -----Eredeti üzenet----- Feladó: David Meeker [mailto:dmeeker@xxxxxxxx] Küldve: 2002. október 2. 19:17 Címzett: femm mailing list Tárgy: [femm] Temperature dependence of PM materials I'm looking at sort of an odd application in which it would be desirable to have a PM material with a very strong temperature dependence. Usually, the opposite is the desired property--one usually desires magnetic materials that have as little temperature dependence as possible so that small changes in operating temperature don't affect machine performance. However, I'm curious to know if anyone has a material in which the knee of the magnetization curve moves significantly at fairly low temperatures, say in the 60C to 80C range. Since this is sort of an odd requirement, I haven't been able to find anything like this in my usual manufacturer's spec sheets and favorite PM websites. Dave. -- David Meeker <http://femm.berlios.de/dmeeker>
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