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

[listener192]

Attached are some scope shots from the latest scheme.
Still two poles 7 coils each (opposite parallel).

The Arduino digital IO has been extended by treating the analog pins as digital outputs so 60 pins now available.
Individual control of HSS and LSS switches in each of the 15 H bridges.

Links have been placed between the coils and 7+7(parallel) coils are driven in series.

Example:
HSS 1 left = on LSS 7 right = on. 
LSS 8 right = on, LSS 7 right = off.
HSS 2 left = on, HSS 1 left = off.

and so the sequence moves forward.

Unfortunately the use of H bridges doesn't allow the sequence to continue unbroken so 1/16 & 15/30 are not linked.
When the leading coil of the sequence of 7, reaches coil 15/30, the trailing edge coils are sequentially turned off at the same time a reverse sequence starts at coil 1/16.

The feed forward boost into the leading coils in the sequence, terminates prematurely and this is seen in the waveform.

The unfiltered output voltage waveform is starting to look closer to that of Pierre's however.

I ran this at 30V DC input and the no load input current draw was only about 3.5A

Output was about 150W approx, so much better than previous schemes.

I should mention the recovery current was much higher in proportion to the input current averaging about 5A for under 9A input,
whereas the previous scheme was producing 10A but for an input of 40A.

More testing required before deciding the next step.


L192

[FixedSys]

....This make a change to the series inductance, as the new coil(s) charge, while maintaining the pole MMF.

Great work. This is an important discovery that I had missed. This is changing the intensity which in addition to the movement of the field will contribute much to the overall rate of change factor in Faraday's law.
Are we close to being able to put together a timing diagram that describes the interaction of all these factors?

[listener192]

Attached is a doc that shows part of the sequence. This is only an example as my scheme has 7 coils in circuit at all times.
The failing of this scheme is the requirement for the H bridges to reverse coil current every 180 degrees.
MMF is still generated by each coil in the reverse chain however, the boost function is not realized. This may be seen in the recovery current scope shot in my previous post. Note the absence of recovery current during the negative going part of the output waveform.

The forward progression of boost current only is fully realized while there are 7(+7)  coils active, so 9 out of the 15 steps, each 180 degrees.

I should point out that the changes to produce this were easy and so I tried this first.

Splitting the coils again into a series loop with half bridges and parallel sections as Pierre has suggested, will take much more time to work out. 




L192

[listener192]

Great work. This is an important discovery that I had missed. This is changing the intensity which in addition to the movement of the field will contribute much to the overall rate of change factor in Faraday's law.
Are we close to being able to put together a timing diagram that describes the interaction of all these factors?

The stator composite MMF, producing the output waveform needs to be varying in amplitude at a 50/60Hz rate but not dropping to zero apart from the zero cross areas of the sine.

The individual MMF's comprising each step  created by the current through the individual coils, must therefore also not drop to zero however, if they stay static a lot of current is drawn once the inductance of the coil is overcome. By charging  a group of coils in parallel or series parallel and discharging all in series into a leading coil, current is maintained through the charge group  coils until the next step.

I have looked at Pierre's switch scheme drawing out 20 sections or so on paper. I have figured out how to parallel/series charge 6 coils and then to series discharge into a single coil.

What I am having difficulty with, is completing this action in reverse direction to generate the opposite pole. The traveling direction need to be the same as the other pole for the switching sequence but the current direction needs to be in the opposite direction.
Two completely separate switching circuits with separate coils could accomplish this easily, but you have to be able to visualize a scheme that will work with one set of coils.
L192

[shylo]

Mechanical switching can get very complicated ,I've tried

Electronic is the way to go if you have the knowledge, which sadly I don't.
Using the reverse fields is part of the solution I believe
Like you say I don't golf, fish, hunt, take trips, I enjoy tinkering to each his own.
Thanks for sharing and good luck
artv