Muller Dynamo

[duff]

New video to be seen here:  http://www.youtube.com/watch?v=yNtnLAVk9Og


New puzzle for me:  according to the theory, when in resonance, we should have NO phase shift!!

Regards Itsu

Itsu,

The magnitude and phase of the circulating current in a parallel resonant circuit is different inside the tank vs outside the tank.

I think you were actually looking at the correct point when you had the 1 ohm resistor outside the tank .

To test this you can return the resistor to the previous position and change the capacitance while keeping everything else constant. You should see a phase shift.

[Jdo300]

Hello Bolt and All,

Me and my research group today started doing some tests and measurements on our pulse motor. Since we were interested in observing the effects of adding a series vs. parallel capacitance to the output coil, we tried both configurations to compare the performance difference. The results we obtained were very interesting and we posted a couple of YouTube videos demoing the motor's behavior in both parallel and series modes:

Parallel Mode Video:
http://www.youtube.com/watch?v=OVRPrCIA-IU

Series Mode Video:
http://www.youtube.com/watch?v=1Qqcq-lbP8A

NOTE: The videos contain a lot of raw footage so apologies for the bad camera handling at times .

In both videos, our generator coils are wired in series canceling (bucking) configuration and we short the output of the circuit through the DC bridge rectifier white monitoring the tank circuit voltage and current using a scope and DC-50MHz magnetic current probe.

For specs on our generator coils, see my previous post here: http://www.overunity.com/index.php?topic=3842.msg293269#msg293269. All other details including the circuit schematic and scope measurements are included in the videos.

Executive summary of tests:

What we observed was that when the capacitor was in parallel with the motor (speed tuned to resonant frequency), the motor sped up about 100 RPMs when the output was dead shorted through the DC bridge rectifier; but the tank current and voltage waveforms collapsed (same results and waveforms as Itsu). When the short is removed, the motor slows back down. If the parallel capacitor is removed completely, the motor accelerates faster that it does when the output is shorted (so the presence of the capacitor in the circuit is itself seen as a load). However, when observing the current and voltage waveforms, they are 90 degrees out of phase with each other.

When the system is setup for series resonance, the motor runs freely without any lugging from the presence of the capacitor. The induced voltage from the coil produces a distorted sine wave. Once the output is, again, shorted, this time the AC voltage across the coil increases substantially along with current through the coil (which again are at 90 degrees to each other), however, in this case, the motor slows down rather than speeding up. It is interesting to note that in the series case, the voltage and current waveforms look like almost perfect sine waves except for some steps in the top of the voltage waveform (I believe Bolt showed similar waveforms in one of his simulations).

After performing these tests, the following thoughts and questions come to mind:

1. It seems that the acceleration that occurs when in parallel resonance happens because the current waveform collapses as seen from the coil when the output is shorted, thus reducing the apparent current load on the system. However, in series, the current increases at resonance. In our case, the motor still slowed down despite the 90-degree phase shift between the voltage across the coil and the current through the coil.

2. (@ Bolt), in your posts, you definitely emphasized the importance of having the tank circuit operating in series resonance, with the current and voltage waveforms 90 degrees out of phase. I did observe a substantial increase in voltage and current once the circuit was shorted out at the resonant frequency, and from the points in the circuit that I measured, the voltage and current waveforms were 90 degrees out of phase with each other, yet the system still decelerated. One thing I want to ask is if there is a specific point in the circuit where the current needs to be measured? (I know in the circuit diagram you approved in this post here, a 1Ohm resistor was placed at the spot where the current was to be measured. This is the spot where I clamped the current probe). Is there something that I am still missing here?

3. For all the tests we have performed so far, the coils were wired in the series bucking configuration. I need to clarify one point here. Does the speedup effect (with coils in series resonance) require that the coils be in the series canceling configuration or should the coils be in the series adding mode if using a tuning capacitor?

4. If going the bifilar coil route, would one consider the coil to be in series or parallel resonance when tuning the system to the bifilar coils' natural resonant frequency?

Any help/advice is greatly appreciated as I want to make sure I have the correct understanding to properly tune the system.

- Jason O

[Magluvin]

Hey JDO

I will venture to say the bifi capacitance is similar to parallel. ;]

The difference between series and parallel is that the capacitance is spread across the bifi coil as if it is parallel.

And since Romero says they were bifi, or lets say multifilar, and he and you show speed up, I feel confident in what I say.  ;]

But if you are going to try a multifilar, highly recommended, I would love to see what you come up with.

Have you tried using both with the coils you show in the vids?  Might be interesting.

Nice work.  ;]

Mags

[Magluvin]

hey Jay

What I wanted to say was,,  have you tried both at the same time, parallel and series.  ;]

Mags

[Jdo300]

Hi Magluvin,

I agree with you that if interpreting the distributed capacitance of the coil as parallel capacitance, then it must mean parallel resonance also.

BY the way, I just did another series of tests tonight with the coils connected in series adding rather than canceling and got much much better results when getting past the resonant frequency. I'm uploading a new video now and will post the link the morning once it finishes processing.

As for connecting series and parallel at the same time, I could try that though I don't have two 6 uF capacitors. I'll have to look through my stash and see what I've got.

Lastly, one of the experiments I plan to try tomorrow is to swap the drive and generator coils so I can see what the output looks like on low impedance output coils. More to come soon  .

- Jason O