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Steve Conner

Mon Apr 26 2010, 09:40AM

Registered Member #30 Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706

Linas wrote ...

i have question
Predictor can compensate driver delay , but does that delay depend of operating frequency ? Because my driver has constant delay for various frequencies so if i change oscillation frequency, do i need tune predictor again ?
th

There are several different Prediktor designs. According to Steve Ward, the one with the inductor (IIRC) has a delay that varies with frequency in the right way to compensate changes in operating frequency. His latest design takes this into account, but I'm not sure if his earlier ones did.

Whether you need to retune a constant delay depends on how big the change in frequency is. The PLL driver I used in Mjolnir has a constant delay, and I set it once when I built the coil and haven't touched it since. I didn't make any major changes to the system, apart from changing the tank capacitor from 0.05uF to 0.1uF.

Something to bear in mind: Does the switching delay time of your IGBTs depend on frequency? Surely if anything, it depends on current.

Can't wait to see this working Finn! :P

Finn Hammer

Mon Apr 26 2010, 11:35AM

Registered Member #205 Joined: Sat Feb 18 2006, 11:59AM
Location: SkÃ¸rping, Denmark
Posts: 741

Steve McConner wrote ...

Can't wait to see this working Finn! :P

I am having a hard time waiting myself.
When we get around to it, we (that's Daniel and Myself) plan to arrange a TeslaTune, where all are invited and welcome.

TeslaTune? That's right, you read right:
We are in concord with modernity, here, and Teslathon is an awkward, oldfasioned word, that just don't have the right ring to it, anymore.
When Teslists gather, they discuss and display tuning techniques, and listen to tunes played on coils. Time passes in a jiffy, so why the Painfull, exhausting marathon connotation?

Heard in the ghetto, recently: (Girl asks boy) "Did you attend the Continental TeslaTune last weekend? It was awesome!"

You are all coming....

Cheers, Finn Hammer

Finn Hammer

Thu May 13 2010, 06:48PM

Registered Member #205 Joined: Sat Feb 18 2006, 11:59AM
Location: SkÃ¸rping, Denmark
Posts: 741

The capacitor for Thumper was initially just 10 strings of each 10 CD 940C12W1P5K-F caps.
I felt it was time to put them together in something resembling permanence.
After some time with SolidWorks, machining of the parts started. Not so much to confirm that I am a plaxi-hater, but rather because I had the sheets in stock, the combs that hold the caps in position are made from clear PVC:

Here is the basic module, there are 2 of them:

Half finished, I test if it fits into the mainframe:

Here the caps have been fitted into the frame:

The capacitor on a large DRSSTC is a major component.

How big is yours?

When the busswork on a capacitor is treated with the attention worthy of a Ferrari, it becomes pertinent to question the sanity of the constructor:

But then, when this buss is integrated with a 5kA rotary contact, the chances of mating with sanity are rapidly decreasing: here the individual parts

Assembled:

Tested with the cap:

And here the finished article:

The rotary contact ensures that the inductance of the wiring doesn't change during tapping, and it also provides a hole to pass the wires from the motors and end stops down from above.

If anybody feels like shouting: "But that contact presents a shorted turn to the primary coil" do it now and let's be done with it!

A video that shows the function of the rotary contact:

Another great step towards the RATDRSSTC has been completed!

Cheers, Finn Hammer

Dalus

Thu May 13 2010, 07:03PM

Registered Member #639 Joined: Wed Apr 11 2007, 09:09PM
Location: The Netherlands, Herkenbosch
Posts: 512

Wow, that MMC is huge compared to the bridge. No chance of blowing a cap

tobias

Fri May 14 2010, 12:07AM

Registered Member #1956 Joined: Wed Feb 04 2009, 01:22PM
Location: Jersey City
Posts: 172

Nice piece of machinery you have been using sir! And the right tools for each job! I wish some day I'll have those too for my hobbies!
Very good job! Being sane is aways the boring option! hehehe

Dalus

Fri May 14 2010, 08:09AM

Registered Member #639 Joined: Wed Apr 11 2007, 09:09PM
Location: The Netherlands, Herkenbosch
Posts: 512

Hehe you need to built your bridge like mine. It pretty much looks like a V-8 engine. Would be quite suitable for your ferrari. Still have a lot of metalwork to do though

Mads Barnkob

Fri May 14 2010, 09:39AM

Registered Member #1403 Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968

You never seize to amaze me and I will visit you and Daniel this summer :)

Daniel Uhrenholt

Fri May 14 2010, 11:21AM

Registered Member #125 Joined: Fri Feb 10 2006, 01:52PM
Location: Aalborg, Denmark
Posts: 155

Nice work Finn!

I have to steal the idea of the rotary contact for my coil, when I have time to make the MMC for it:-)

I have to update the Diable Tonnere thread today, as I am almost done with it nowâ€¦ The toroid you saw at the shop earlier today is now done and I just need to get it to my apartment somehowâ€¦

Cheers, Daniel

Finn Hammer

Fri May 14 2010, 06:47PM

Registered Member #205 Joined: Sat Feb 18 2006, 11:59AM
Location: SkÃ¸rping, Denmark
Posts: 741

Dalus wrote ...

Hehe you need to built your bridge like mine. It pretty much looks like a V-8 engine. Would be quite suitable for your ferrari. Still have a lot of metalwork to do though

Some pictures of that V8 engine would be nice. Feel free to post them to this thread, if you like.
Cheers

Mads Barnkob wrote ...

You never seize to amaze me and I will visit you and Daniel this summer :)

And about time too! Looking forward to that!

And Daniel, feel welcome to steal, copy and plagiarise as you feel fit. Everybody, I want you to plagiarise!, that's the whole idea with this thread.

Cheers

Dalus

Fri May 14 2010, 09:26PM

Registered Member #639 Joined: Wed Apr 11 2007, 09:09PM
Location: The Netherlands, Herkenbosch
Posts: 512

Hope to get most of the metalwork done by Monday. Then it's cutting some teflon by hand for the cap supports.

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