Benches > giantkiller
LTPU Center Toroid Breakout
giantkiller:
This rabid pitbul is not giving up...
I am looking into this center device again. It seems to be a commercially produced unit. I am particularly interested in the center dividers in the middle of each toroid. Are they plastic, aluminum, iron, or ferrous?
They do divide the 4 wires coming out in pairs.
Anybody have info or insight?
Thanks in advance.
wattsup:
@GK @GK
Thanks for your PM and good to hear from y'a. I'm always in and out and around. Always reading the threads but mostly working on my Spin Conveyance Part 3 and also on some small experiments for others to try to explain it. So, SM's Toroids. Let me see during the day tomorrow I will post some ideas.
In the meantime look at these two links.
@Grumpy shows it well on this thread.
http://www.overunityresearch.com/index.php?topic=1219.msg19336#msg19336
So as it he shows how the bucking turns from one half to the other continues by passing under the divider before ti changes direction of winding turns, hence your bucking mode. This implies that the two haves are in series and would therefore require only two wire of the four leaving the toroid center.
Another is this post I made on this thread that links to the idea of two lead pairs but not from each half of the toroid.
http://www.overunityresearch.com/index.php?topic=356.msg13474#msg13474
I'll be back sometime tomorrow.
wattsup
ion:
--- Quote from: giantkiller on 2016-11-10, 19:35:06 ---This rabid pitbul is not giving up...
I am looking into this center device again. It seems to be a commercially produced unit. I am particularly interested in the center dividers in the middle of each toroid. Are they plastic, aluminum, iron, or ferrous?
They do divide the 4 wires coming out in pairs.
Anybody have info or insight?
Thanks in advance.
--- End quote ---
I have always maintained that those devices are standard common mode chokes such as the attached pictures show, although some disagree with this position. The divider is plastic as that is required for the regulatory spacing requirements for these devices, which usually have to withstand 1.5kV to 3 kV. The potting in the center insures the dielectric withstand as well as securing the "flying leads".
These devices are of domestic US design because of the black and white wires that usually connect directly to the line after fuse and switch. If they were IEC the leads would be brown and blue. I have seen similar devices in surplus stores that I used to frequent in the 70's and 80's. Nowadays the devices usually sit directly on a pc board, so the flying leads are not used.
The toroidal core for CMC's has been largely abandoned in favor of the low cost and higher dielectric capabilities of the split bobbin/C or E core approach. Toroidal CMC's are now usually only found in small versions that do not require special mounts.
Try this to understand how they are used and for images:
https://images.search.yahoo.com/search/images;_ylt=Awr5.ow8iSdY_n8APLRXNyoA;_ylu=X3oDMTE0OG8yMzhpBGNvbG8DYmYxBHBvcwMxBHZ0aWQDQjE5MTBfMQRzZWMDcGl2cw--?p=common+mode+choke+circuit&fr=yhs-invalid&fr2=piv-web
CMC's have special properties such as exact turns ratios for very good common mode noise filtering.
Note also that there is a video showing SM turning off the LTPU and a spark jumps at the precise switchoff time between the two windings and precisely at the closest breakover point, where the plastic divider meets the core and between the two windings.
This proves that the winding does not continue around and also that SM's device required the high dielectric strength that such a CMC could provide. But I also believe he used the devices for their other unique properties, and not necessarily as filters.
Of course this is only my opinion, based on having designed commercial products with such devices in the distant past.
FWIW
giantkiller:
Thanks for the answers!
I am pursuing a hunch:
ion:
--- Quote from: giantkiller on 2016-11-13, 04:31:22 ---Thanks for the answers!
I am pursuing a hunch:
--- End quote ---
Coreless I presume? Well hopefully let us know what you have in mind and how the experiment goes.
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