STEORN DEMO LIVE & STREAM in Dublin, December 15th, 10 AM

[LarryC]

The following is from Peswiki about the JLN replication:

Feedback from Steorn
On December 28, 2009 1:39 AM Mountain, Sean McCarthy, CEO of Steorn wrote:

Thanks for that - however I must urge some caution here, what Jean-Louis will find is that all of his electrical input is being output as heat and that the work done by the rotor is free. However this does not mean that simply putting in a generator will enable him to close the loop.

The reason is that the design of the 'active' coils is very important so that the input uses minimum current to cause the effect in question - the production of heat is a current^2 relationship. Unless this fact is considered in the design of the input, then while the system may be more than 100% efficient, the work done by the rotor will be less than the energy input into the system, and so a closed loop system will not be possible.

Our next sequence of experiments will address these issues.

We are quite happy to discuss this in more detail with Jean if he has further interest in replication (two of our engineers are French, so they should be able to communicate well). 

[broli]

I agree with Sean. If you are not recycling the inductive energy and using too much ohmic energy you will end up chasing a goose when you close the loop. Unless you can also recycle the heat in a meaningful way which will just bloat the system. The best method to consider is the one discussed early on in this thread, make sure the current doesn't come near the ohmic current limit and recycle the inductive energy.

But it's good to see that we are on the right path according to Steorn.

[broli]

One thing that remains is to really prove conclusively rotor couples only magnetically to the cores and doesn't influence one bit the electrical characteristics of the coils. To prove that scope traces at much higher sensitivity have to be presented than those shown by Sean on the 19th. Unltimately, one has to have this well-crafted contraption and study it with high-end equiment as the one Sean uses, to reach conclusive proof.

I think the emf that has been seen by some people when rotating the rotor by hand is caused by the imperfection of the windings. A perfect toroidal coil is a coil that has uniform amounts of windings all the way around and where the windings are as tight together as possible. Any imperfections give rise to local emfs being produced which can be measured.

I also proposed an experiment to show whether that same measured emf has the same amplitude when current is flowing through the system, see:

http://www.overunity.com/index.php?topic=8411.msg217852#msg217852

Basically this will give you a clean result without any interference of the voltage by the battery. As any change in the energized coil will be picked up by the coil hooked to the scope equally.

[captainpecan]

Here is the first test run of my latest Steorn replication motor in the link below. The motor can get to speeds of over 2000 RPM and more for a constant input power of only 100ma at 12V. The only speed limitation appears to be the reed switch with this current test setup.

What in your opinion did you do different, to allow that good of a run on such low current?  With my experiments, I am finding that if I use weaker magnets (ceramic) I can get a good run for alot less current, but the torque also suffers.  When I use the Neo's, mine is just current thirsty... I mean, I think I heard mine burp when I turned it off, lol....

[broli]

What in your opinion did you do different, to allow that good of a run on such low current?  With my experiments, I am finding that if I use weaker magnets (ceramic) I can get a good run for alot less current, but the torque also suffers.  When I use the Neo's, mine is just current thirsty... I mean, I think I heard mine burp when I turned it off, lol....

Guys post as much parameters as you can:

Magnet types
Inductance of coils
permeability of core
sizes

This way others can compare notes and perhaps improve their motors.

Also try the following. My sims showed that the attraction forces can be as much as 13 times higher if the magnets pole orientation is tangential to the rotor instead of radially.