Who will be the first to liquid cool them? 
Phase change?
(Topic ID: 134925)
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I didn't realize this was actually a thing. What's the reason for the loss of power? Is it the coil heating up, expanding, and squeezing the sleeve/plunger harder?
Quoted from markmon:Sterns 5020 coils are strong but small and can hear up even with eos working correctly. I've experienced it with lotr, Batman Forever, acdc (my first one not this one), and 24. The games that use 5032 coils seem better but those are weaker coils.
The inrush current is what's making them heat up, but what's the scientific explanation for why they lose power? Heating wouldn't effect the coil operation electrically until it failed, unless I'm missing something.
Is it the expansion from heating that causes more friction?
Quoted from Don_C:Magnetic flux density (B) is determined by B=NI, where N= number of turns, I = current. N will not change as the coil heats up. However, the resistance of the coil will go up with temperature. I=V/R where V= Volts, R = resistance of the coil. Volts will not change, so as R goes up, I, the current, goes down. Then B goes down and the flippers lose strength.
Don C.
Going from room temp (around 22C) to boiling water (100C) would only increase the resistance by about 1 ohm on a 5020, I didn't realize it would have that much effect on the power. TIL...
Quoted from Don_C:I just wanted people to know that it’s not friction, but the resistance change that lowers the force.
Don, thank you very much for spending the time to type this out and explain it. It's exactly the kind of explanation I was looking for!
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