Re-Inventing The Wheel-Part1-Clemente_Figuera

[Listener192]

Coil reversal

Hi UFO

Your waveform however, shows a positive excursion followed by a rest at zero followed by a negative excursion this implies that one end of the coil is ground or zero volts.

Can you provide a new diagram that illustrates what you have said above?

L192

[Listener192]

Coil Reversal

Hi UFO

So are you saying the coil floats during the 45 degree period, i.e. only connected to the capacitor?

L192

[Ufopolitics]

Hi UFO

Your waveform however, shows a positive excursion followed by a rest at zero followed by a negative excursion this implies that one end of the coil is ground or zero volts.

Can you provide a new diagram that illustrates what you have said above?

L192

Hello L192,

That wave I just "painted" it, based on just ONE Terminal signal...and it is just my "imaginary" interpretation from the rotary switch behavior...BUT, have NOT done it yet in reality.

The actual signal from both coil terminals connected to probe and its ground...well, I have no idea what that one would look like...


Regards


Ufopolitics

[Ufopolitics]

Hi UFO

So are you saying the coil floats during the 45 degree period, i.e. only connected to the capacitor?

L192

[Listener192]

Coil reversal

Hi UFO

This can be done with the same switching pulses, each switching two MOSFETS together one to + and one to - rails then all switches off for 45 degs then the alternate pair of MOSFETS are switched, these four MOSFETS being connected as an H bridge.

L192

[Ufopolitics]

Hi UFO

This can be done with the same switching pulses, each switching two MOSFETS together one to + and one to - rails then all switches off for 45 degs then the alternate pair of MOSFETS are switched, these four MOSFETS being connected as an H bridge.

L192

Hi L192

Great!!...if you say so...excellent!!


See You tomorrow...


Regards


Ufopolitics

[Ufopolitics]

Being even more precise...

Hi UFO

So are you saying the coil floats during the 45 degree period, i.e. only connected to the capacitor?

L192

Hello L192,

I want to be here MORE PRECISE...in my answer.

My answer before was:

Yes, that is quite the correct approach.

I wrote "quite", because it is not precisely what I am doing on my switch...

Look at image below:



First off, the R Green Arrow is wrong, it should be moving opposite (CLOCKWISE) in order to NOTE what I will explain below:

[Listener192]

Cap connection

Hi UFO,

so looking at this from the electronic switching aspect, can I leave the cap connected to the coil, or do I only need to connect the cap during the 45 degree period?

L192

[Ufopolitics]

Hi UFO,

so looking at this from the electronic switching aspect, can I leave the cap connected to the coil, or do I only need to connect the cap during the 45 degree period?

L192

Hello Listener192,

That's a heck of a question friend!!

The best answer I will give it to you from real testing...when I have the set up running...and while reading output...see if by connecting cap fixed to coil terminals, would do affect EMF Output or Not.

It may work...as long as the cap capacitance would keep up with frequency speed, more likely a very small value, in order not to disturb the poles reversing timing (duration basically) to induce the right Output.

Normally a Running Cap from a BRUSHLESS Home Generator would be rated pretty low capacitance...that could range from 25 to 40 mfd and generator would output same way with both values...(I already tested that)

By all means, it could even "smooth" transitions...

If it works it would be a great way to reduce Input from source to minimal levels whenever operational speed/hertz is reached.

I am not too far to finish the rotary switch...just had some big time issues with one of my PC's BIOS...and stopped reading the main 1 terabyte HDD where I had most of CAD and works...thanks GOD, it was not a failed hard drive!!...I could read it and defragmented as clean it (CHKDSK) etc, on my other PC.


Regards


Ufopolitics

[Ufopolitics]

Probing Two Channels...

Hello L 192,

This is what I believe the signal should look like, if we set one probe on each coil terminal...no ground used.

The Purple one is just getting closer to the real way it should look, based on the ripples from coils plus spikes whenever entering Cap discharges...

As you see both On Times takes place at same timing but reversed (alternated)



Both signals are identical, except reversed...so on image there is a slight difference on second squares smaller than first, which is my error on graphic.

Again, this is my "projection" based on the rotary switch that I have built...and I could be off.


Regards


Ufopolitics

[Listener192]

Coil current rise time

Hi UFO

I ran a quick simulation on a 100mH coil fed by a +&- 30V supply with your wave form and although the voltage will rise and fall squarely the current will have a triangular waveform equal to the period. As flux follows current then induced output will also follow. With an added cap of say 25uF in parallel with the coil, then that triangle starts to turn into a sine. It will be interesting if you obtain something different.

L192

[Ufopolitics]

Hi UFO

I ran a quick simulation on a 100mH coil fed by a +&- 30V supply with your wave form and although the voltage will rise and fall squarely the current will have a triangular waveform equal to the period. As flux follows current then induced output will also follow. With an added cap of say 25uF in parallel with the coil, then that triangle starts to turn into a sine. It will be interesting if you obtain something different.

L192

[Listener192]

Simulator waveform

Hi UFO,

This is using an H bridge with ideal switches. MOSFETS give a similar but not quite square voltage waveform.

Voltage in green, current in yellow.

A 25uF cap makes little difference. It requires a very high value to make a sine wave.

L192

[Listener192]

With MOSFETS in H bridge

Hi UFO,

Attached is with MOSFETS and also showing power.

L192

[Listener192]

Current Waveform

Hi UFO,

I should point out, that if the input coil is only has a coupling coefficient <0.9 as would be the case with an open core, the coil current waveform would be as previously shown. If the coupling coefficient was say 0.999 i.e. a typical transformer, then the current waveform would be similar to the voltage waveform.

L192