Re: Aluminum magnet wire?


    That is aluminum alloy, and Nickel, cobol, aluminum makes a powerful
permenant magnet.  I checked, and all of the wire is alloy aluminum.  Not
plain old aluminum.

>James and all,
>Interesting speculation, James... but your "repulsion" theory would
>actually mean that copper was a very dangerous conductor! :^)
>In reality, it's diamagnetic materials that are slightly repelled by a
>magnet. Paramagnetic materials are slightly attracted to a magnet. And,
>it turns out that copper is slightly diamagnetic(!), while aluminum is
>slightly paramagnetic. In reality, these effects are quite small, and
>these properties really have NO bearing on the behavior of these
>materials when used as magnet wire. Using aluminum magnet wire is
>certainly not dangerous, and it can be an inexpensive alternative to
>copper magnet wire.
>Aluminum magnet wire is extensively used to reduce cost and weight in
>many transformers, including some utility distribution transformers.
>It's also used extensively in the power utility industry for
>transmission lines. By increasing the diameter of the aluminum conductor
>to compensate for its poorer electrical conductivity, utilities end up
>with a transmission line having a lower electrical loss than copper for
>an equivalent wieght per unit length. In fact, some less expensive [read
>el-cheapo...] NST's use aluminum magnet wire - not because it performs
>better, but simply because it's cheaper!
>Because the electrical conductivity of aluminum is only about 61% that
>of copper, the DC and AC resistance will be higher for an aluminum
>conductor of the same size. Also, skin depth of a conductor is actually
>a function of the _magnetic_ permeability and electrical conductivity of
>the conductor. For copper and aluminum, the relative permeability is
>very close to being 1, and aluminum magnet wire will work fine for your
>secondary (although copper or silver would perform slightly better).
>However, DON'T try winding your secondary using ferromagnetic steel or
>iron wire... :^)
>-- Bert --
>Tesla List wrote:
>> Original Poster: "The Flavored Coffee Guy" <elgersmad-at-msn-dot-com>
>>     That is very dangerous because, aluminum is paramagnetic, and it
>> presents the opposing magnetic field to a changing magnetic field.  I
>> wouldn't say that was a good experiment for a novice at all.  Unless, you
>> have years of experiance, don't do it.
>> James.
>> -----Original Message-----
>> From: Tesla List <tesla-at-pupman-dot-com>
>> To: tesla-at-pupman-dot-com <tesla-at-pupman-dot-com>
>> Date: Thursday, September 16, 1999 4:04 AM
>> Subject: Aluminum magnet wire?
>> >Original Poster: Aric_C_Rothman-at-email.whirlpool-dot-com
>> >
>> >     Is aluminum magnet wire an acceptable substitute for copper magnet
>> >     wire in a secondary?
>> >
>> >     Aric
>> >
>> >