Re: A LUA file for BELA (a help to build electrostatic model of TC)

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Paul Benham" <paulb@xxxxxxxxxxxxxxxxxxxx>

Hi Finn,

Thanks for doing this.  I have just joined the yahoo group but have not had
time to look at this.  It is something I want to learn.

Cheers,

Paul.

----- Original Message -----
From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Thursday, December 15, 2005 8:53 PM
Subject: A LUA file for BELA (a help to build electrostatic model of TC)


> Original poster: Finn Hammer <f-h@xxxx>
>
> All,
>
> Dmitry showed an electrostatic analysis of his TC, made by a program
> called FEMM4
>
> I thought it would be cool to be able to automate the construction of
> the model, because FEMM is not a fast application to work with.
>
> The fun part is designing the grounded shield and the dielectric stuff.
>
> FEMM4 is a combination of a magnetic and an electrostatic calculator.
> The electrostatic module was formerly called BELA, but is now a part of
FEMM4.
>
> Over on Yahoo groups, I met a guy, Senthil Ram, who not only offered
> to- but actually _did_ write a script to build the model of the secondary
coil.
> With that script as a model, I was able to add the code for the
> remainder of the coil, as well as position the coils relative to Y=0.
>
> It only does cylindrical coils, not pancake and not conical, but that
> is because I`m too lazy to do the code. Perhaps a job for you?
>
> If you would like to model a coil of yours, download the file from here:
>
> http://home5.inet.tele.dk/f-hammer/DRSSTC.lua
>
> Then get FEMM 4.01 from here:
>
> http://femm.foster-miller.net/Archives/bin/
>
> At the bottom of the files menu: "load LUA script" load DRSSTC.lua
> and follow the prompts, to describe your coil and work out the
> electrostatic stress imposed on the primary by the secondary.
>
> Imput is mm, and the inputs are meant to be self explanatory, perhaps
except
> no. 5  "Maximum Segment Degree"
>
> This determines how many segments a circle is divided into.
> If you make the input =1 then each circle will consist og 360
> segments, and it also means that the sourrounding mesh that will be
> generated to define the matrix that calculations are carried out on,
> will become very fine meshed.
>
> And that calculation time will increase, as well as memory use will
increase.
> I think that a value around 20 is a good value to use but YMMV here.
> input no.13, "triangle size (o.25-3)"
> Has a similar aim, namely to controll the size of the grid. Try with
> 3 to start with, go lower if you feel better resolution is in order.
> I went out and got a 1meg memory module for my TravelMate 240 laptop,
> and as long as I don"t try to model all 3000 secondary turns, I`m
> alright. Try a couple houndred turns to start with.
>
> I hope it may be of some help to someone apart from me.
>
> Cheers, Finn Hammer
>
>
>
>