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

[wings]

All,

Do you remember the circuit drawing I posted back on page 55? I have started to build
it and will test the circuit. The two toroid ferrite core coils are glued to a center ferrite core.
The worst part is done (winding the two toroid) and now I have to wind the generator coil.

Alex.

Nice device.....
from my side I have run my motor with single small toroid, reed and a fan rotor but ...too far to have low current.

From the second picture it seem that you have put the magnets inside not outside the toroids, the central part is the ferrite where you have to wind the output coil ?

with a single magnet (apart the toroid) it is close to the Kunel device see the following document.

http://www.intalek.com/Index/Projects/Patents/DE3024814.pdf

the Kunel ring design is also nice

lot of information on similar devices :

http://www.intalek.com/Papers/Handout3.pdf

[Groundloop]

@wings,

No, the magnets is not there yet. The magnets will be on the outside of the
toroids as shown in the drawing. I have seen the Kunel device and also tested
it some time back. I did not find any ou in the Kunel device.

Alex.

[Omega_0]

A simple mechanical switching method is shown here for those who don't want to mess with mosfets and circuits

Cut a triangle shape out of metal sheet (copper or any other) and glue it on a CD or disc of plastic/wood. Attach it to the rotor above or below it, it should rotate with rotor. Use two/four triangles if you have two/four coils.

Use an unshielded multi-strand mains wire as contacts to be placed above the CD on a support. Support should not rotate and should be fixed to shaft or something. One contact should be fixed near the center which will be return path.

You can vary the duty cycle by simply placing the other contact near or far from the center (0-100% on-time is possible). You can vary the phase by simply rotating the disc relative to the rotor by the amount of angle you need.

You will need a pot in the circuit to vary the current and a shunt for meters/scope. The disadvantage here is that it will spark if you are using high voltage. Advantage is that you don't need reed/hall effect sensor or opto sensor and complicated circuits.

[plengo]

When I think about the induced magnetic polarization in the toroid but no voltage induced on it  I become very puzzled why is that. Can someone explain or show where I can learn about that one effect?

One thing that comes to my mind about the rotor being attracted by the core of the toroid but once the toroid is energized and no longer there is an attraction by the rotor magnet, is the concept of a "magnetic diode".

It sounds like one can induce a magnetic flux on the toroid core from the rotor magnet but no voltage or current generated on the toroid at the same time that, a current and voltage on the toroid creates enough polarization on the core to avoid being attracted by the rotor's magnet.

It is like one way induction only.

I must be mistaken by my understanding of this effect.

Fausto.

[neptune]

The way I think of it is this. When the toroid is energised , all the magnetism is contained
inside the core which forms its own tight closed magnetic circuit. Any relationship between the unenergised core and an external magnet is a very poor relation with an open magnetic circuit [5mm airgap] If this concept proves to be overunity ,then we may think of it as a "magnetic transistor" rather than a diode.{smal power controlls larger power] Not  very hi-tech answer, but may help you .