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Williams EM coil question


Gemini2544

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If it's these two:

 

FL-21-375/28-400 https://www.marcospecialties.com/pinball-parts/FL-21-375_28-40

 

FL-20-300/28-400 https://www.marcospecialties.com/pinball-parts/FL-20-300_28-40

 

Then I think the 20/28 will be fatter wire, less turns, less resistance, more kick.

 

Thanks Andrew, seems the opposite which is the reason for the question. The FL20-28 seem weaker than the FL21 28-400, and the FL20-28 is near new.

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This is what I have learnt...

The thicker the wire normally means the stronger but this goes in combination with the amount of turns.

 

You can normally take out about 10 tens and this will make the coil stronger but there is a sweet spot where the more windings you take out, the weaker the strength.

 

Finding this sweet spot is the science.

 

The thicker the wire, the longer it takes for it to heat up.

The thicker the wire, the more amps the coil will require however this is offset by the amount of windings. More windings, the less current, the longer it takes to heat up, less windings, the more current, the quicker it heats up.

Edited by Autosteve
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This is what I have learnt...

The thicker the wire normally means the stronger but this goes in combination with the amount of turns.

 

You can normally take out about 10 tens and this will make the coil stronger but there is a sweet spot where the more windings you take out, the weaker the strength.

 

Finding this sweet spot is the science.

 

The thicker the wire, the longer it takes for it to heat up.

The thicker the wire, the more amps the coil will require however this is offset by the amount of windings. More windings, the less current, the longer it takes to heat up, less windings, the more current, the quicker it heats up.

 

Sounds an awful lot like Ohms Law doesn't it. :)

 

- - - Updated - - -

 

I'd be tempted to swap the coil between flippers, if the problem moves, it's definitely the coil, replace it with the proper Williams coil. If it stays with the mech, look at the other parts.

 

I've bought a matching pair of new replacements & I'll keep the two coils in the machine as spare parts.

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Sounds an awful lot like Ohms Law doesn't it. :)

 

There is a formula to some degree but to work it all out is somewhat harder than just having a stab at it.

 

The thicker the wire would be my choice as it definitely is capable of more strength because thick wire can handle more electricity but being thicker wire also means it takes longer to heat up. So two ticks for thick wire.

The thinner the wire, the cheaper it is to make. So one tick for thin wire.

 

Then it becomes how close to the sweet spot the coil was originally wound.

Edited by furballx
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This is an electro-mechanical solenoid you are talking about

There are a lot of factors that affect the strength; the air gap, the magnetic circuit and of course the electrical circuit

Why are people talking about the time to heat up? That is a byproduct

The current to pull the armature in is high, the current required to hold it in once closed is not that high

The EOS switch is there to remove part of the coil so it does not burn out when you hold the flippers in for ever

Have a read here....

https://en.wikipedia.org/wiki/Solenoid

http://hades.mech.northwestern.edu/index.php/Solenoid_Theory

https://tameson.com/solenoid.html

http://spiff.rit.edu/classes/phys313/lectures/sol/sol_f01_long.html

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