Re: Spiral Strip Inductor


"John Popelish" <jpopelish@xxxxxxxx> wrote in message
news:8--dnVMpaa1RGsDeRVn-tA@xxxxxxxxxxxxxxx
> Gary Pace wrote:
>> Hi :
>>
>> I take a strip of copper, width w and thickness t, wind a spiral coil of
>> N turns with an inner diameter d1 and an outer diameter d2 (no iron, just
>> plastic spacers and air).
>>
>> Does anyone know a method (numerical or closed-form) for determining the
>> inductance ?
>>
>> There are a few Java calculators for spiral coils online, but it's not
>> clear if they refer to wire or strip in a spiral.
>>
>> Thanks
>> Gary
>>
>>
> As long as the thickness of the coil (the width of the strip) is less than
> the inner diameter of the coil, it doesn't make much difference if its
> wire or strip.

Thanks John.
That's not what I expected.
My thoughts went like this :

- I'm using 3" x 0.125" thick strip
- If I wound a spiral with 0.125" diameter wire I'd get a figure for L
- If I wound 24 of these (i.e. 3" wide strip) and connected them in
parallel, but no magnetic coupling I'd get a really low L
- Obviously, when I stack these side by side, I get some coupling
- So the geometry of the strip really matters

I tried to work it out from first principles (flux per amp), but university
is just too long ago.

I had naively hoped that a quick Google would yield L = MagicFunction
(N,w,t,d1,d2)


.

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