Re: Aluminium aka Aluminum Wire (fwd)

["Tesla list" <tesla@xxxxxxxxxx>]

---------- Forwarded message ----------
Date: Sun, 30 Sep 2007 15:17:36 -0700
From: Barton B. Anderson <bartb@xxxxxxxxxxxxxxxx>
To: tesla@xxxxxxxxxx
Subject: Re: Aluminium aka Aluminum Wire (fwd)

I goofed the link. Left out a "d" in "eddy". Here's the correct link.
http://www.eddy-current.com/condres.htm

BTW, I checked out MWS Wire Industries aluminum magnet wire. Looks like 
resistivity is about 2.73e-8(ohms/m) as compared to copper at 1.707e-8 
(ohms/m). So, the 1.6 times copper value holds for aluminum magnet wire. 
And so, both DC and AC resistance will follow linearly in both cases 
(and thus Q will follow).
http://www.mwswire.com/ecalum.htm

On a side note, solder does far better than I would have thought! Good 
to know! Also interesting is the fact that silver is the best conductor, 
but it's not that far ahead of copper. Pretty close actually!

Take care,
Bart

Barton B. Anderson wrote:

> Hi Ed, Gary,
>
> Funny Gary that you joked about Aluminum in the UK as opposed to the 
> US. You might be surprised to find the vast numbers of aluminum alloys 
> out there on the market, and their conductivity (the inverse of 
> resistivity) vary's greatly! Today I was adding the ability of Javatc 
> to include copper or aluminum wire by simply changing the resistivity 
> value (simply a check box in Javatc for Aluminum or Copper). As magnet 
> wire is annealed copper, it's resistivity is well known. So, I started 
> looking for aluminum magnet wire to insert a correct resistivity value 
> and stumbled across an interesting table of data.
>
> Thought I'd share since were on the subject:
> http://www.edy-current.com/condres.htm
>
> The conductivity for various aluminum allows is amazing!
>
> Take care,
> Bart
>
> Tesla list wrote:
>
>> ---------- Forwarded message ----------
>> Date: Sat, 29 Sep 2007 17:57:37 -0700
>> From: Ed Phillips <evp@xxxxxxxxxxx>
>> To: Tesla list <tesla@xxxxxxxxxx>
>> Subject: Aluminium aka Aluminum Wire
>>
>>    Just wound the following coil from #10 aluminum wire:
>>
>>    12 turns
>>    3.5" diameter
>>    3" long
>>    Approximate inductance 8.45 uH
>>
>> F kHz      Q
>> 2500      375
>> 3000      425
>> 2800      465
>> 5000      510
>>
>> Measurements were made with a Heathkit Q meter [regular Boonton too 
>> heavy to lift onto bench with my bad back] which seems to have an 
>> accuracy of better than 10%  Wire had been sitting on a peg for 
>> several years and leads weren't cleaned.  Connections via clip leads 
>> and banana plugs, hardly the best..  Bottom frequency was set by 
>> capacitor in meter.  I have bigger capacitors of high Q and will try 
>> to extend the measurement lower at some time or other.  But I'm sure 
>> the frequency doesn't change the accuracy of the comparison of 
>> aluminum and copper.
>>
>>    Tomorrow I'll wind the same coil with #10 copper and compare 
>> results.  Expect them to be similar but a little better but not by a 
>> factor of anywhere near 2..
>>
>>    Bottom line is that "aluminum ain't anywhere near as bad as it's 
>> cracked up to be - nowhere near".
>>
>>    Results of other experiments welcome.
>>
>> Ed
>>
>>
>>
>>
>>
>>
>>  
>>
>