Pierre's 170W in 1600W out Looped Very impressive Build continued & moderated

[AlienGrey]

In theory it also can be done with ferrite cores but the arrangement need to be kept like in original Pierre's design to have approximation of magnetic field behavior in the center. And there is limitation about size because smaller it gets more meshed magnetic fields become between themselves on the core.

And as parts are slowly arriving to my place I am still also looking for ways how I could get one of 20-30cm diameter motor stator cores with winding fittings towards center and to the outside. So I can make windings in same fashion Pierre had. Any suggestions which ones are available to buy?

Cheers!

Interesting, might I ask where the parts are available from ?

[T-1000]

Interesting, might I ask where the parts are available from ?

https://www.amazon.co.uk/dp/B06XKHN62M/
https://www.amazon.co.uk/dp/B01EYW5R5M/
https://www.amazon.co.uk/gp/product/B076BB33RC/
https://www.amazon.co.uk/dp/B01EV70C78/
https://www.amazon.co.uk/dp/B0739XRX8F/
https://www.amazon.co.uk/dp/B073ZHVKC1/
https://uk.rs-online.com/web/p/mosfet-power-drivers/8312764/
https://uk.rs-online.com/web/p/mosfet-transistors/1596516/

[Grumage]

In theory it also can be done with ferrite cores but the arrangement need to be kept like in original Pierre's design to have approximation of magnetic field behavior in the center. And there is limitation about size because smaller it gets more meshed magnetic fields become between themselves on the core.

And as parts are slowly arriving to my place I am still also looking for ways how I could get one of 20-30cm diameter motor stator cores with winding fittings towards center and to the outside. So I can make windings in same fashion Pierre had. Any suggestions which ones are available to buy?

Cheers!

Hi Arunas.

With regard to your question in the last paragraph, would the Armature from a large universal motor serve as your " inside out " design?

Cheers Graham.

[T-1000]

Hi Arunas.

With regard to your question in the last paragraph, would the Armature from a large universal motor serve as your " inside out " design?

Cheers Graham.

Hi Graham,
Would you able to link picture and model of it? We are after 36 dual side pins stator.

Cheers!

[d3x0r]

In theory it also can be done with ferrite cores but the arrangement need to be kept like in original Pierre's design to have approximation of magnetic field behavior in the center. And there is limitation about size because smaller it gets more meshed magnetic fields become between themselves on the core.

Cheers!

Right; was just a curiosity/experiment; not suggesting alternative designs... If there is 'flux twisting' or that flux has a rope-like character that could be advantageous..


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Redid the pairing/winding picture... I started to just label sets of 6 poles (original black 1-31, and blue 2-32); then starting marking paired poles with matching colors; especially over the top where it overlaps from 31-1  which has nothing to do with 1-7 pairing.


Although I was considering an alternative construction method; same design though; could wind 36 coils, stack them around a form, wind a 37th coil for the center pickup; put in spacers to fill between the center core and the sides; and fill with ferrite-epoxy/resin...   (the air gap on sides is important to get flux channeled through pickup coil. (yellow fill; not ferite) )


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Added coil-color pairing (hue shifted like 90 degrees). (it was way wrong; fixed it)
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Edit3: Hmm...
1-6 ... which is 2 coils with no gap... turning on the next phase 2-7 overlaps ... 1
(1-11) slots on..                           (2-12)
1,13,25 


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Edit4 : WIth the poles so near, and a skip of 2 between... the winding is actually like a figure 8 (kinda)....
And then it turns out 1 full rotation is 6 cycles output...


Did some research on characteristics of figure 8 coils... FOund these   (OFF TOPIC)



https://onlinelibrary.wiley.com/doi/full/10.1002/bem.21886

Abstract
Previously we proposed an eccentric figure‐eight coil that can cause threshold stimulation in the brain at lower driving currents. In this study, we performed numerical simulations and magnetic stimulations to healthy subjects for evaluating the advantages of the eccentric coil. The simulations were performed using a simplified spherical brain model and a realistic human brain model. We found that the eccentric coil required a driving current intensity of approximately 18% less than that required by the concentric coil to cause comparable eddy current densities within the brain. The eddy current localization of the eccentric coil was slightly higher than that of the concentric coil. A prototype eccentric coil was designed and fabricated. Instead of winding a wire around a bobbin, we cut eccentric‐spiral slits on the insulator cases, and a wire was woven through the slits. The coils were used to deliver magnetic stimulation to healthy subjects; among our results, we found that the current slew rate corresponding to motor threshold values for the concentric and eccentric coils were 86 and 78 A/µs, respectively. The results indicate that the eccentric coil consistently requires a lower driving current to reach the motor threshold than the concentric coil. Future development of compact magnetic stimulators will enable the treatment of some intractable neurological diseases at home. Bioelectromagnetics. 35:55–65, 2015. © 2014 Wiley Periodicals, Inc.

(and entirely disrelated)
http://www.reelex.com/REELEX/ = they wind spools of (cable) in figure 8's so it balances the twists and feeds the cable straight...