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EEG EM Basic
#91
Pleased to witness this! Amazing understanding and the quality of fine detail revealed is excellent!
Have a fantastic day!
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#92
Hi All,

A question, Lamination is broadening the b-h curve and consequently decreasing the flux density (B) a lot, which has key role in power output.

if we supposed to deal with milliamps, can we leave the cores as solid and do not laminate them?
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#93
Hi AR_AH,

A Lamination structure was chosen since it was the only choice - finding a 15mm solid piece of good electrical
steel in the quantities needed turned out to be a bit of a problem. Laminations were not that easy either but
at least it was possible. 

Plus I wanted two different materials so a comparison of performance could be made.

Using Laminations has a down side - a loss of somewhere near 4% (overall performance is reduced to about
96%).  I should help reduce the "Eddy Current" losses (working at higher frequencies - 1-2kHz) but that's a
subject for debate (and analysis).

Note - if we're lucky - the output could be in the (hopefully) many Amps!   Guests cannot see images in the messages. Please register at the forum by clicking here to see images. 

Also, laser cutting, stacking and bonding laminations seems to be more cost effective. Otherwise a Waterjet
cutting scheme would be required; Milling a solid piece of steel would result in a lot of waste.

Again, a trade-off!

Hope that helps explain my choice of Laminations for this build. Lots of options were not explored in great
detail but for the first pass "Proof-of-Concept" this approach should serve the purpose. 

As they say "Jist Git Er Done!"   Guests cannot see images in the messages. Please register at the forum by clicking here to see images. 

Production, should this novel scheme prove viable, will take on a whole new prospective I'm sure! But for
now - lets just see if it actually works...

SL

Note: I put a few posts re: "Technical Approach" in the other thread...
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#94
Hi solarlab,

so I have two C-shaped cores, an arduino with the IBT_2 motor driver. I am not certain about how to use the driver yet, but that is for the other thread.

The primary coils are pretty straightforward, I put them on a bobbin on both sides of the longer part of the C-C pair. But I am thinking of where to put the secondary coil. Naturally, I want to minimize the amount of material used and for that, I would put the secondary tightly around the core. And then I somehow keep thinking - how is it any different to a normal transformer? Also considering I could replace the two primaries with one (possibly!), then it looks just like a transformer with a primary and a secondary coil.

Of course, in the designs posted here, there are usually multiple N-S pairs through which the secondary goes through. But why should we expect it will work better than a transformer? I guess that we will see. But I think there is no reason to expect that one N-S pair will somehow deliver any excess power.

Wanted to post a picture but the limit here is 500 kB and I took a photo that is 1.5 MB.
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#95
A photo of the setup, this is before attaching the arduino to the IBT_2 bridge.


Attached Files Thumbnail(s)
   
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#96
Hi Kloakez,

Looking pretty darn good!  I have a feeling it should work...

One or two "Loop Coils" are inserted in the upper and/or lower middle parts of the "U Poles."
Not sure of the number of turns - some simulations showed results with only one turn, TBD.

Note that I no longer refer the windings as Primary and Secondary just to try and avoid
confusion. Now I use "Pole Coils" and "Loop Coils." Operation is different than a typical
transformer as well - the TF scheme uses Lorentz Force Law where the magnetic field is
transverse (orthoganal or at right angles) to the Loop Coil.

The last three pages of the .pdf below show a diagram with two (2) Pole Pairs (each with a N-S Coil)
and the large Loop Coil that sits in the upper-middle slot of the Pole Pairs.

Typical - TF_LinGen_V2 Desig_Part 1_of_2.pdf
https://www.mooker.com/thread-47-post-689.html#pid689

The diagram on page 5. shows a solid view. Where the large Loop Coil is located "exactly" is TBD.

https://www.mooker.com/thread-47-post-693.html#pid693
This .pdf shows a link to the Wind Turbine layout review. Second link is the "Transverse
Magnetic Flux Permanent Magnet Generator" near the bottom. Here they use a round
scheme since the Permanent Magnets (PMs) have to rotate between the Poles but it
shows the basic concept. There's a good video at the bottom of the page.

Note the Loop Coil is just a loop of wire that "floats" in the middle of the Poles. I made it
oval since there is no rotating magnet wheel - so any shape should be OK.


For the EE_TFG we replace the permanent magnets with Electromagnets (coils are wound
around the legs of the pole pairs). The rest is pretty much the same as the PM Wind Generator.

Hope this answered some of your questions. "May the Force be with You."

SL

PS. Still have a couple of weeks before I get the Laminated Poles from the Fab Shop. 
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#97
Cautious Optimism BUT There Is Still A Huge Amount of "Stuff" Left To Do

Being a New and Novel "never been done before" technology, the EE_TFG design and development
is still in it's early infancy. There's no comprehensive book to follow nor blueprint to study.

However, based upon some good CAE Analysis coupled with some similar techniques used by primarily
in Wind Generators employing Permanent Magnets, there is cause for a great deal of Optimism.

But there is a mountain of Science, Engineering Discovery and Design work that still needs to be done 
and many questions that need to be answered. This will take time and require a systematic approach.

Just to mention a very few examples; including:

- Does the Loop Coil cause disruption, or interfer with, the Pole Pieces and their Coils? 

-  Is the device Voltage and Current really isolated (BEMF or Lenz), can it be truely quantified? 

- Are the Magnetic and Electric Fields isolated, as someof the literature claims?

- If these anomolies are determined to affect the device; can they reasonably be mitigated
   electronically, physically, or by other means? 

- Is the device environmentally safe, in both the short term, and the long term? 

- Is the device stable over time?

- If the device works out and performs as expected, then it's doubtful cost will enter into the equation.

Once these, and other unforseen concerns are properly addressed, then the Applications Functions can 
follow. It willimpact a huge arena - well - pretty much everything found in the modern, and the not so 
modern, World.

Proper planning and co-ordination of these challenges will (hopefully) move the process 
along quickly, while providing some pretty exciting "challenges" along the way!

SL
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