[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

# RE: [femm] Temperature dependence of PM materials

- To: femm@yahoogroups.com
- Subject: RE: [femm] Temperature dependence of PM materials
- From: Keith Gregory <k.gregory@lboro.ac.uk>
- Date: Fri, 04 Oct 2002 08:05:40 +0100
- In-reply-to: <001a01c26af4$3e383270$a5eb81d8@mein8c9fx7p5mj>
- References: <BA2AA9F09CE90F4A91964573E68F9B540455EB@huneleckft01.hunelec.hu>

`The rare earth (Lanthanide for the purists) Gadolinium is ferromagnetic and has a Curie point around 16 degrees C. It's pretty soft magnetically though and would not make a permanent magnet but I did read somewhere that it had been used in alloys to reduce the Curie temperature.`
`Keith.`
`At 09:26 03/10/2002 -0600, you wrote:`

>     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>

> ``
> ``
> `Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/`

    Dr. Keith Gregory
    Senior Lecturer
    Department of Electronic & Electrical Engineering
    Loughborough University
    Loughborough
    Leicestershire
    LE11 3TU
    UK

    Phone: +44 (0) 1509 227025 Fax: +44 (0) 1509 227014
    Department web: http://www.lboro.ac.uk/departments/el/

``

- References:
  - RE: [femm] Temperature dependence of PM materials
    - From: "Gal Janos" <jgal@hunelec.hu>
  - RE: [femm] Temperature dependence of PM materials
    - From: "kirk" <kirk@3rivers.net>

- Prev by Date: Re: [femm] Re: Temperature dependence of PM materials
- Next by Date: RE: [femm] Re: Temperature dependence of PM materials
- Previous by thread: RE: [femm] Temperature dependence of PM materials
- Next by thread: RE: [femm] Temperature dependence of PM materials
- Index(es):
  - Date
  - Thread