winding a electromagnet

[terry1094]

Tom Schum posted an interesting chart which shows the effect of various parameters on winding an EM:

http://mysite.verizon.net/vzesfls5/sitebuildercontent/sitebuilderfiles/coil_comparisons.pdf

Terry

[metalspider]

Honk,
What do you think is the fastest rise time I can hope for?

Paul

P.S. Merry Christmas 

[metalspider]

Honk,
What do you think is the fastest rise time I can hope for?

Paul

P.S. Merry Christmas 

[Honk]

Merry Xmas.

That is a tough question.
It depends totaly on the final inductance of the solenoid.
I'm sorry, but I can't give you a straight answer on this question due to the many unknown variables.
But I believe you will have a hard time getting down to one 1ms. The Solenoid is just to big to have a low inductance.
You should really aim for a high current solenoid to reach your goal. This is your best shoot.

(I guess this electromagnet is going to be used in your fine E.M.I.L.I.E. Looking forward to see it)

[terry1094]

If we look at Tom's chart, we find that you can have thick wire, high current and relatively low voltage to result in a given EM field.  Alternatively, you and have a thin wire with lots of windings, high voltage, lower current and give the same relative field.

Since time is of the essence, it would be prudent to choose a very small wire with a very large breakdown voltage on the insulator (say teflon) and create many windings.   With a breakdown voltage of, say 2000 V, and a IGBT gate, one could achieve the required field with a small L/R ratio.

But, as Honk says, it requires a lot of trade-offs to optimize such a design.

Merry ?mass to all and to all a good nite!

Terry