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Pancake coil wire calc.

a = inner radius of pancake b = outer radius of pancake d = diameter of wire

length = pi * (b*b - a*a) / d

Reply to
Tim Shoppa
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Well, mine seemed too obvious to explain, but since you asked:

Length = (area of pancake)/(width of wire)

= (area of circle of outer radius - area of circle of inner radius) / d

= (pi*b*b - pi*a*a) / d

Tim.

Reply to
Tim Shoppa

I read in sci.electronics.design that Roger Reed wrote (in ) about 'Pancake coil wire calc.', on Thu, 10 Nov 2005:

Take the average of the outside and inside diameters and multiply by pi. That gives you the average turn length. The number of turns is found by taking the difference between the outside and inside diameters and dividing that by the wire diameter. Total wire length = average turn length multiplied by number of turns.

Near enough for jazz, anyway.

--
Regards, John Woodgate, OOO - Own Opinions Only.
If everything has been designed, a god designed evolution by natural selection.
http://www.jmwa.demon.co.uk Also see http://www.isce.org.uk
Reply to
John Woodgate

I read in sci.electronics.design that Tim Shoppa wrote (in ) about 'Pancake coil wire calc.', on Wed, 9 Nov 2005:

Yes, but I explained why. (;-)

--
Regards, John Woodgate, OOO - Own Opinions Only.
If everything has been designed, a god designed evolution by natural selection.
http://www.jmwa.demon.co.uk Also see http://www.isce.org.uk
Reply to
John Woodgate

Mean diameter times number of windings times PI

Burry.

Reply to
Sjouke Burry

Not being a mathematical genius myself, can someone suggest a formula or other way to determine how many meters of wire of a specific diameter it would take to wind a single layer pancake coil of a specific diameter?

Roger Reed

Reply to
Roger Reed

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