Re: Question about electromagnet heat
- From: "Charles Schuler" <charleschuler@xxxxxxxxxxx>
- Date: Sun, 26 Nov 2006 17:23:03 -0500
"Bob Engelhardt" <bobengelhardt@xxxxxxxxxxx> wrote in message
news:mM2dnauZZs7eVfTYnZ2dnUVZ_vudnZ2d@xxxxxxxxxxxxxx
I have a nice electromagnet that I got on eBay (
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=200045827548 ). I'd
like to determine it's maximum current for 100% duty cycle. My plan is to
apply a small voltage (say 1 volt), let it reach steady state temperature
(minimum current) and calculate the temperature using R=Rs[1+a(T-Ts)].
Increase the voltage and repeat until a maximum temperature is reached.
The magnet would be sitting on a piece of steel approx. 12" sq x 1/4"
thick, to simulate its intended operating environment (power tool table).
1. Are there any flaws in this approach? Or should I say, what are the
flaws in this approach - there must be some.
2. What maximum temperature that I should use? I assume that the magnet
wire varnish would be the weak link, but that still doesn't help, much.
The magnet is potted in "polymer", would that limit the temperature more
than the varnish?
As a wild guess; do not exceed 150 C.
.
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- Question about electromagnet heat
- From: Bob Engelhardt
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