Author Topic: FEMM tesla coil simulation  (Read 145 times)

Offline Simranjit

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FEMM tesla coil simulation
« on: July 06, 2024, 09:42:43 PM »
Hi, In the quest of finding best configuration for my future QCW DRSSTC I simulated my Tesla coil in FEMM. I tested Primary in 3 different configurations. All of the pictures have 12 turns of primary. The problem I'm facing is that magnetic field lines are not intersecting the secondary completely. I already built my tesla coil secondary.

Should I chop off some of the secondary to accommodate magnetic field lines or Are there any other configurations I should try ?
Currently secondary length is 410mm. I can cut it down to 275mm roughly.

I am kind of worried about making primary too tall or moving it too up because an arc will probably strike it. I'm guessing this is matter of finding right balance.
« Last Edit: July 06, 2024, 10:18:56 PM by Simranjit »

Offline davekni

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Re: FEMM tesla coil simulation
« Reply #1 on: July 06, 2024, 10:35:49 PM »
Top load acts as a shorted turn, blocking magnetic field.  Most TC designs include some spacing between top of secondary winding and top load.

Not directly important that magnetic field lines cross all of secondary or not.  (A tiny bit if field is there.  Just not visible at the field density displayed.)  Key parameter is coupling factor between primary and secondary.  Most people use JavaTC for estimating TC parameters including coupling factor.  FEMM is more detailed and covers more geometry options, so I use that too.  Attaching a .txt file that can be changed to .lua, a FEMM script for calculating coupling factor.

* coupling_factor.txt

QCW coils work best with high coupling.  I've seen success cases here down to 0.35 (or perhaps even 0.3), but I'd aim for at least 0.4.  Your designs may already be that high.
David Knierim

Offline Simranjit

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Re: FEMM tesla coil simulation
« Reply #2 on: July 07, 2024, 12:08:50 AM »
Top load acts as a shorted turn, blocking magnetic field.  Most TC designs include some spacing between top of secondary winding and top load.

Not directly important that magnetic field lines cross all of secondary or not.  (A tiny bit if field is there.  Just not visible at the field density displayed.)  Key parameter is coupling factor between primary and secondary.  Most people use JavaTC for estimating TC parameters including coupling factor.  FEMM is more detailed and covers more geometry options, so I use that too.  Attaching a .txt file that can be changed to .lua, a FEMM script for calculating coupling factor.

* coupling_factor.txt

QCW coils work best with high coupling.  I've seen success cases here down to 0.35 (or perhaps even 0.3), but I'd aim for at least 0.4.  Your designs may already be that high.


Thank you very much. Script worked like a charm. Values between JAVATC and FEMM are pretty close. I think i can get k=0.45 easily maybe even k=0.55.

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Re: FEMM tesla coil simulation
« Reply #2 on: July 07, 2024, 12:08:50 AM »

 


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