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Old 23rd March 2020, 12:32 PM   #1
myleftear is offline myleftear  Switzerland
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magnetic momentum
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Originally Posted by Salas View Post
Its the 250VA toroidal transformer building up magnetic momentum. Are you using normal or time delay (slow blow) primary side fuse?
During my long research on transformer/inrush current, I once stumbled across this long info-sheet about exactly the magnetic momentum of transformators. It's in german, unfortunately, but as far as I understood (that's not that far), it is adressing exactly this issue.
If I got it right, it manages the electric/magnetic impulse of a transformer, but not the inrush current into the capacitors...

Maybe some knowledgeable mind can chime in for more details?

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File Type: pdf 00-Trafoschaltrelais-Vortrag-FSM_121019.pdf (472.6 KB, 32 views)
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Old 23rd March 2020, 08:55 PM   #2
Salas is offline Salas  Greece
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magnetic momentum
Don't know German. I moved it here in case someone can comment. Better category chance than originally in the NJFET phono thread.
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Old 23rd March 2020, 11:29 PM   #3
Sorento is offline Sorento  Europe
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If you go to Transformatorschaltrelais – Wikipedia you get a more readable explanation albeit also in german though. I thought they teach german in switzerland. Anyway, you could try to have this translated into french or english. The english wiki on the subject is not the same and will not help you further. But right at the very end of the german wiki there is a link to a euro patent which might be of interest to you. Espacenet -

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Old 24th March 2020, 04:06 AM   #4
Dave Zan is offline Dave Zan  Australia
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Originally Posted by myleftear View Post
Maybe ...chime in for more details?
That is a nice presentation, the FSM circuit is clever, the best I have seen.
I have not seen any DIY version of this, it would be a useful project, maybe patent issues.
Member Taur0221 had a circuit that had a similar effect, looked well done.

Originally Posted by Sorento View Post
Transformatorschaltrelais – Wikipedia... more readable explanation
This seems to be written by the same person and is quite helpful, easier to translate.
I think the OP's comment that he couldn't completely understand it is about the technical content, not that he can't read it.

Best wishes

Last edited by Dave Zan; 24th March 2020 at 04:35 AM.
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Old 26th March 2020, 01:43 PM   #5
jfetter is offline jfetter  Costa Rica
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magnetic momentum
Magnetic inertia is tied closely with Aspden's discovery of virtual inertia.
The motor experiment was verrifed in vacuum chamber.
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Old 27th March 2020, 10:53 AM   #6
Kay Pirinha is offline Kay Pirinha  Germany
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Originally Posted by Sorento View Post
If you go to Transformatorschaltrelais Wikipedia you get a more readable explanation albeit also in german though.
I have the very suspicion that this article's author is the same man who runs www.emeko.de - see the 2nd weblink. The article's diction and the grapghics appear to be almost identical as the ones used in this company's website, and no one else in the German speaking world uses the term Transformator-Schaltrelais. So this article has to be taken with many grains of salt. Rather it appears to have the character of an ad.
Clever ideas, though, but at least medium-sized transformers like the ones we use for audio purposes can be soft started with much less effort.
Best regards!
"I spent a lot of money on booze, birds and fast cars. The rest I just squandered." (George Best)
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