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# RE: [femm] Temperature dependence of PM materials

- To: <femm@yahoogroups.com>
- Subject: RE: [femm] Temperature dependence of PM materials
- From: "dragospopa" <dragospopa@pcnet.ro>
- Date: Sat, 12 Oct 2002 18:06:07 +0200
- Importance: Normal
- In-reply-to: <001a01c26af4$3e383270$a5eb81d8@mein8c9fx7p5mj>

    Dear Kirk, I'm interested about the magnetic circuits temperature of work
    With permanents magnets.
    Please advise me if you have something.

    -----Original Message-----
    From: kirk [mailto:kirk@3rivers.net]
    Sent: Thursday, October 03, 2002 5:27 PM
    To: femm@yahoogroups.com
    Subject: RE: [femm] Temperature dependence of PM materials

    There are ferrites with curie point near room temperature.
    Kirk

    -----Original Message-----
    From: Gal Janos [mailto:jgal@hunelec.hu]
    Sent: Thursday, October 03, 2002 4:03 AM
    To: femm@yahoogroups.com
    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@ieee.org]
    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>

`<<attachment: application/ms-tnef>>`

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