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

[listener192]

L192, look at the field groupings that I've shown. DON'T cross your fields!!!  This is why you have no recovery!!!   The wiring of your stator needs to be different.  Your fields are all locked up with no recovery.  Also, use the coil groupings to create the leading/trailing edge of a magnet.   This is were I'm going in the research.

@ Konehead, I like your thinking on using switch on a.c. leg of FWBR.  I believe you use solid state relays for this.  Am I correct?   The body diode on our H-bridges will possibly be a problem still.  We are using the IBT-2 boards. For a 6 field rotation system.  I want to keep it down to 20 H-bridges with the field groupings.  This would require 20 MORE switches for the SSR.  But I'm thinking you can turn all 20 SSR on at the same time.  Keep the MCU pin count down. Can you recommend a good SSR?  We need the switch to be bidirectional.  I have a very high quality bi-directional switch that we can use, however, not 20 of them, and will cost more to build.  Hopefully I'm thinking in the right direction.  Correct me if I'm wrong.

As for the leading/trailing edge of the magnet.  Konehead!!!!You are bang on!  BRAVO!!!!   If you combine coil groupings in a very specific way you can simulate a leading/trailing edge of a magnet.  Run SAME field groups in parallel with SAME OFFSETS to create your leading/trailing edge of a magnet.   As the rotation changes from N to S or vs...you still have the leading/trailing edge combination of field groups.  Use the field groupings in parallel to create the stronger leading/trailing edge of a magnet.
This is for sure the right direction.

Jerdee

Well my coil scheme is the 5 coil version of the 6 coil version that Pierre described and used. Sure there are overlapping fields N and S just like Pierre had. He never showed us any recovery waveforms but the only way you see appreciable recovery with this scheme is if you turn coils off completely which he shows at the end of his code sequence. I am not so fast to step away from this as Pierre mentioned there is still a missing element. I have seen little effort to find out what this is and now you are wanting to proceed down a developmental path to improve on his original design which nobody yet understands.


L192

[T-1000]

There is no equivalent to this using switched coils on the stator as they just produced discrete stepped flux that gives the appearance of movement when looking at rotational force I.e the rotating magnet in place of the rotor but there is no physical movement of flux through space just a series of discrete fluxes at different angles relative to the center of the stator. logically putting coils directly in line with the path of this switched flux would not result in flux cutting just flux linkage.

All coils must be have magnetic flux path over same output core just on different angles to the center like the moving magnet usually does. And in case of moving magnet there is flux cutting on the wire in transition from one magnetic pole to another. Also if magnetic pole positon changes position too fast there will be almost no current on the output coil. And when switching from one coil to another you need smoth power down in previous coil and power up in current coil which will slow down magnetic pole position change. One of possible solutions for that is to have capacitor across each coil for this purpose. And have all coils also connected with 3 plate capacitor (2 capacitors in series with center tap) from the power source. Then you can make coil power transition smooth as possible from one coil to another. And obviously it is a bit different approach than everyone are doing Pierre's case.

P.S> Pierre's 3 phase aligment have 1 strong and 1 weak pole facing output core. Which makes perfect sense when you want to have single North or Souh pole going across whole coil. Then changing smothly as possible to opposite pole.

[pmgr]

All coils must be have magnetic flux path over same output core just on different angles to the center like the moving magnet usually does. And in case of moving magnet there is flux cutting on the wire in transition from one magnetic pole to another.

T-1000 again, as L192 has already mentioned multiple times, there is no flux cutting. Why don't you take another look at the FEMM simulations I did for this device:

https://www.youtube.com/watch?v=bVARO4DH8uU

All the flux is contained inside of the stator and rotor and the only position where it crosses the air is in the gap between the rotor and the stator. It's a discrete flux cutting scheme.

PmgR

[ariovaldo]

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[listener192]

This is just the controller to simulate the magnet "passing" in front the coil.
I will rewind one of the stators that I have.
https://www.youtube.com/watch?v=nCReDKa6Fn8


Let's to see the results..

If this were true it would show up in a FEMM simulation.


L192