Wheeler's air core coil formula

Thread Starter

webbie

Joined Jul 21, 2010
2
Hi - I hope I'm not speaking out of turn here. I'm new to this community and was just browsing the site. I noted that in the inductor sizing equations here: http://www.allaboutcircuits.com/vol_5/chpt_1/6.html

you state that "Wheeler's spiral formula is 1% accurate for c>0.2" but make no reference to c. From here:
http://microblog.routed.net/wp-content/uploads/2008/10/pancakewheel.pdf
and here:
http://info.ee.surrey.ac.uk/Workshop/advice/coils/air_coils.html

c refers to the winding thickness of a multi layer coil. Should your reference be updated?

Steve.

P.S. I know this is nit picking, but useful is spelled with one 'l'...
 

The Electrician

Joined Oct 9, 2007
2,970
Hi - I hope I'm not speaking out of turn here. I'm new to this community and was just browsing the site. I noted that in the inductor sizing equations here: http://www.allaboutcircuits.com/vol_5/chpt_1/6.html

you state that "Wheeler's spiral formula is 1% accurate for c>0.2" but make no reference to c. From here:
http://microblog.routed.net/wp-content/uploads/2008/10/pancakewheel.pdf
and here:
http://info.ee.surrey.ac.uk/Workshop/advice/coils/air_coils.html

c refers to the winding thickness of a multi layer coil. Should your reference be updated?

Steve.

P.S. I know this is nit picking, but useful is spelled with one 'l'...
Even more to the point is the fact that the eBook says:

"Wheeler's formulas for inductance of air core coils which follow..."

but they don't give Wheeler's formulas at all.
 
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