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Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
The workings inside FanTC/JavaTC are explained in Paul Nicholson's TSSP papers. They are numerical methods, not "formulas". (I got through an entire EE math curriculum without understanding the difference, but I eventually got it.) You don't want to be implementing them on a microcontroller.
Reframe the problem: why do you want a uC to calculate k in the first place? How will the user input the coil geometry to the uC?
Say you were designing a motor-driven variable coupling system, and you wanted the user to set k directly. I would use JavaTC to calculate the coupling in lots of little steps over the travel of the mechanism, then use that data to make a lookup table for the uC.
Registered Member #3900
Joined: Thu May 19 2011, 08:28PM
Location:
Posts: 600
that's what I would do, but javatc has me doubtful. the secondary geometry gave me whacko numbers which I proved wrong with my own calculations and another calculator. the coupling would've been off due to that. it's really strange, and a one time occurrence(don't ask how that works with a pre-written script).
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
JavaTC and FANTC use the same engine. I've used FANTC to design my last three coils and they all turned out fine. I'm using JavaTC for my next coil and I have no reason to doubt the results so far... Are you sure you entered all the figures right? Hit the "Draw System" button and see if the picture looks like what you expect.
Registered Member #3900
Joined: Thu May 19 2011, 08:28PM
Location:
Posts: 600
yes, all the dimensions where in cm, and the coil somehow had a higher inductance and lower ~fres than some of the giant brick coils, without a topload. it should be around 60-80khz in reality with a topload. the picture looked good, but you can't tell much about the secondary other than it's dimensions. i'll give it another try though.
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mathematically calculating k
Hit the "Draw System" button and see if the picture looks like what you expect.