170 watts in - 1600 watts out - looped - Very impressive build and video

[listener191]

Just  a message to those using the L298N H dual H bridge.

This device will be fine for a single coil per bridge approach. You wont be able to implement Pierre's serial coil scheme however, as the L298N has a single enable line for each bridge i.e. you cant turn off one side of the bridge. I have been looking for a board with a bank of half bridges but no luck so far. I think it will be an expensive custom build.

Pierre also raised a point about shoot through protection when using an H bridge. The L298N has about 0.3 to 0.4 us of dead time built in so that should be OK.

L192

[Temporal Visitor]

Oh? Well, thank you for your assessment. What's keeping _you_ from doing so?

Maybe this will help:

https://www.allaboutcircuits.com/textbook/alternating-current/chpt-13/tesla-polyphase-induction-motors/

I will admit to this much: I don't understand where the excess energy is supposed to come from. But I see many loss mechanisms that are easy to understand.
---------------------------------

(Ramset, you seldom watch videos, I know, but you really should watch this one, it's a thing of beauty you will appreciate.)

https://www.youtube.com/watch?v=tC_hXGdaSFg

Others may also be interested in the wiring diagram shown at 5:09 in the above video. Replicators of Pierre's device may care to make their own versions of this standard diagram format, showing their connections, and of course the constructions will have to take into account that there are two coils in each slot instead of a single one.

Really, you are welcome and there is nothing keeping me from making a timing diagram which would make it easier to "reverse engineer". However I do my own work start to finish as much as possible, and do reach out for help from others who are better versed in the areas that are not my strengths when the need arises. At this point I don't yet need a timing diagram and spend time on the fundamentals, like: "In the beginning" - the sequence of EVENTS, all the way to the logical end, to make it work on paper first. Don't enjoy the cart before the Horse routine at all.

The first link you provide is great for learning about currently used motors; which is not what this type of system is functionally nor is there any similarity other than being coils of copper in an iron stator.

It would also be great to learn more about the loss mechanisms you see, especially after once you are able to see where and how the input is working. I am quite sure you can comprehend it if/when shown, and most certainly you would be great to have do an honest assessment of the most basic fundamentals that make it a part of what appears to be a new reality.

Thanks for the video link: It inspired me to draw out my understanding of the winding in that "standard diagram format" for helping others rather than the format I need and use to work alone.

Would enjoy trying to show you, and you know how to make that happen.

[Jeg]

Hi Jeg,

When the pole transition is aligned with the rotor, you would want the N/S poles to fold back through the end of the rotor and not cross through. This would then be the zero cross point of the sinewave.
One of PgmR's simulations shows this happening.

Regards


L192

Hi L192
That is crystal clear. What i am referring to is the moment when North is followed by the South to the same side of the receiver. That moment is susceptible for high oscillations which will not be corrected by lowering the number of poles.

About timing this is the easy part. It is more difficult to extract the old winding out of a burned car alternator!!!

[listener191]

Attached BTN7960 half bridge.

Would work well for Pierres's switching scheme but a little pricey.

L192

[listener191]

Regarding the pole transition issue that Pierre has identified...

If solid state switches were being used, applying pulse width modulation, reducing ON duty cycle to both north and south poles as they approach and leave the rotor, would mitigate the problem without introducing pole gaps.

L192