Pancake coil wire calc.

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.

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.

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. (;-)

Mean diameter times number of windings times PI

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