Muller Dynamo

[minoly]

found this shorting method as alternate to reed in my limited experiments it produced consistent results:
http://www.youtube.com/watch?v=0leZLxHgST0

[kEhYo77]

Ismael Avisio talks about the importance of doing the shorting with a mosfet. He recommends the resistance Rds as low as one can go. 0,005 Ohm max for the effect to be effective. So the solution is to use few mosfets in parallel to get this low...

[e2matrix]

@scratchrobot . You are not the only one thinking about Romero`s switching method .Why not drop him a line care of Want Dynamo Bay ? And while you are at it ask about Penno . I dont have lot of luck with reed switches . Does anyone know if they are available in different sizes and current ratings ?

I wonder if he somehow figured out how to trigger a small relay without using a lot of current for it's coil.  Maybe instead of putting voltage on the coil it was induced so as to pull in the relay to do the shorting?  Just thinking out loud here and not sure if that's reasonable but if it was only one component more it fits in that way. 

[CLaNZeR]

Thanks for the kind words, but I am confused a little here.

Do people not listen to the sound in the video?

My email box is full of advise, full of crytics and full of people that even think what they see on the video is a self runner

So can we please get this straight.

That video was a test run, I had just spent 3 days finishing the Top Plate, Rotor, Axle and wiring it all up. It was getting on towards midnight and I wanted to do a test run and simply post a video showing it run.

It is not a self runner, there is a bloody big battery on the video and a current meter connected to it?
And yep it is a multimeter but it was not showing the voltage of 33 volts or even 600 volts like someone suggested, are some people mad??? Multimeters can do more than measure just voltage.

The Hall sensors are not on their adjusters and have no way been tuned to get the best performance as well as the best position so they pull minimum current on the lowest voltage I can get away with.

The washers are washers to mount the biasing magnets on, they are not ring magnets. This was a test run and after the rig is tuned (which it is not at the moment) then I will add the biasing magnets.

The Rheostat is more than man enough to be a test load, it is wire wound and rated at 25 watts.

So in simple terms if by some miracle the output coils do put out 12 Volts after being rectified and with a load on it, we could still pull over 2 amps.
If as I suspect we will be lucky to get 5 volts out then we are safe to pull upto 5 amps out.
Lets put it this way, if I managed to burn out the Rheostat I will be jumping for joy


I have used the switching circuit that Romero used, I am sure there are better switching circuits and I personaly would rather use mosfets rather than transistors as we then either have a full on or a full off as such.
But I am using the same circuit as Romero's because this is meant to be a replication.

The coils as I have stated from day one are not exactly the same as Romero's as I had 7x0.250 wire arrive instead of the 7x0.125.
I have stated since winding the coils that they are not the same, but I am going to try them for now and re-wind some new coils, when I get time.
I think I even pointed this out on one of the videos?

I agree you can use two current meters to measure in and out, but you are getting an average current out.
Using a scope will allow us to take one or a number of pulses, with the true voltage and true current being measured for the time of that pulse.
We can then plot that and get a true figure of power over time.
The same for the output measurement, we snapshot the same time frame measuring the voltage and current and simply do a VxI to get power and plot over the time frame.


There are other things, but enough bleeting from me, just please will people read the forums.

Again thanks for all the support and sorry if I have not answered all the emails and PM's. It bad enough trying to find time to replicate, let alone anything else and also normal life gets in the way 

Cheers

Sean.

[powercat]

Hi CLaNZeR
That's what happened to Romero, he got way too much attention and even feared for the safety of his family, so he got out quickly.
I guess if you make it self-run they will want to have your babies and make you emperor of the universe.
Good luck with your testing,  the quality of your engineering is A1