From: John Woodgate
Subject: Re: Reducing contact resistance for low volt use?
Date: Tue, 7 Jan 2003 17:59:02 +0000
Organization: JMWA Electronics Consultancy
Reply-To: John Woodgate
NNTP-Posting-Date: Tue, 7 Jan 2003 22:36:45 +0000 (UTC)
X-Newsreader: Turnpike (32) Version 4.01 <5Z8C9wtxbnpWyFnyfFzqmVF739>
I read in sci.electronics.design that DarkMatter wrote (in ) about 'Reducing contact resistance for low volt use?', on Tue, 7
>On Tue, 7 Jan 2003 08:57:45 +0000, John Woodgate
> Gave us:
>>I read in sci.electronics.design that DarkMatter >endoftheuniverse.org> wrote (in >com>) about 'Reducing contact resistance for low volt use?', on Tue, 7
>>>If they get too hot, they stall because you have reached
>>>the currie point of the perm magnets in them.
>>The Curie points of most *metal* permanent magnets are many hundreds of
>>degrees C. A lot of other things would fail before those temperatures
> I think it around 450 F for ceramics. I am not certain, however.
> You mention metal. I guess you mean the exotic, high output
>magnets. Those are expensive motors. I wonder what they do with the
I don't know what material the motors use, but ceramic magnets, which do
indeed have relatively low Curie temperatures, are pretty bulky even
compared with old stuff like Alnico. Nd-Fe-B magnets can be so small
that they are cheaper than Alnico for the same energy.
Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk
Interested in professional sound reinforcement and distribution? Then go to
PLEASE do NOT copy news posts to me by E-MAIL!