winding a electromagnet

[gyulasun]

.....snip
It is possible that someone on this forum may be able to provide you with an answer to your question, but I believe that the men of a bygone era understood more and had more to say about the issue than all the learned individuals of today.  It is for this reason that I tip my hat to Peter Lindemann for recommending the text.

SOLENOIDS ELECTRO-MAGNETS and ELECTRO-MAGNETIC WINDINGS 1914
ISBN:  1-55918-096-X 

Regards

Hi Folks,

Here is an earlier edition of this book from 1910, by the same author, Charles R. Underhill:

http://www.archive.org/download/solenoidselectro00underich/solenoidselectro00underich.pdf

This pdf file is of good quality scan of the original and about 35MB of file size, 388 pages, freely downloadable.

Merry Christmas!

Gyula

[z_p_e]

Thanks Gyula! 

Merry xmas.

[terry1094]

If I wanted to make a electromagnet with .5 tesla at the face with the dimensions of 2.5 inches wide and 5 inches tall, depth will be determined on what is needed to achieve desired gauss. What gauge wire with how many windings would be required.

Paul

You also want a time constant of about 1 ms which determines the inductance to resistance ratio:

http://hyperphysics.phy-astr.gsu.edu/hbase/electric/indtra.html

:-)

Terry

[metalspider]

Yes Terry that is right. So what is the answer?


Paul

[Honk]

Reaching 1ms charge time is virtually impossible in the type of electromagnet you want to design.
In order to reach low charge times you need really low impedance, but at the same time you want
high fields by using high permeability core alloys and this increases the inductance greatly.
The only "easy way" to lower the inductance is to wind your electromagnet using really thick gauge
wire at very low resistance and then run heavy currents through your magnet, something like 150-200 amps.
But this will require some really good & heavy duty power electronics......