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

[k4zep]

Hi Ben,
The Micrometer a Mitutoyo Micrometer head series 149 carbide tipped, can be used to adjust the ceramic ball ( as contact surface to the top of the vertical rotor shaft) So the “sweet spot” of the magnetic bearing relative positions can be finely adjusted.
Yes, that can be an expensive setup for the avg builder.
In the other video just the DPO 7104 new, would run you well into the high 20k or low 30K USD depending on options. Pretty high end equipment and way out of reach for the avg builder out there.
I hope this helps.
Thanks for your contibutions
Mike

Thanks Mike,

There is one of the DPO7104's on Ebay for  $14,999.00.  I have found as an old retired Tec, you can get real deals on EBAY if you shop carefully. My pockets are not as deep as Steorn's! I purchased a good as new  Fluke PM3394B about a year ago after my old Tectonics gave up the ghost for $250.00, cost about 5 grand new and works perfectly. (I like Fluke test Equipment)  Sure it is a few years old but it had to sat on a shelf and not used much at a school.  You can get good Fluke DVM's 5 and 6 digit for 50-60 bucks for those close measurements.  You might have to come up with a power coard and test leads but heck, they were 4-700 dollars new and work great.  Same for HP pluse and signal generators.....VERY GOOD OLD STUFF OUT THERE!!!! 

Just letting those know that are on a limited budget you can get good equipment, you just have to be picky and when you find a good one, use a automated bidding software program to bid at the last min. 

Thanks for the info about the bearing/adjuster and I assume a magnetic load bearing at the  bottom for absolute minimum drag! Excellent fix for a "touchy" adjustment situation!

I read somewhere that Steorn said there were two ways to use this unique system, wonder what the other is???  The "A" field as used must really be a low power system as shown but spin it it does as that is the requirement to get the magnetic shift and no CEMF.  I wonder how long it takes the demo unit to get up to speed!

Respectfully
Ben

[exnihiloest]

Here is a small experiment I just carried out :

A generator outputing a sinusoidal signal (tests performed from 1 Khz to 100 Khz) is connected to a toroidal coil on a ferrite core.

A small single test loop around the toroid, thus acting as secondary of a toroidal transformer and connected to an oscilloscope, permits to monitor the signal. We can shift it around the tore. We observe that the signal does not depend on the position of the loop (classical result, emf depends only on the flux through the loop, which is constant in the torus).

A second magnetic circuit consists of a coil wound around a large piece of ferrite shaped in U and allows to monitor magnetic leakage from the first circuit. Nothing at the oscilloscope, the magnetic field is well confined in the toroid.

Now I apply a stack of powerful neodymium magnets against the circumference of the toroid.
(photo here, test loop not shown: http://exvacuo.free.fr/div/Sciences/Experiences/Bobine/Tore%20fuiteux.png)

It follows that the emf recovered by the test loop now depends on its position around the toroid. There is a ratio of 1 (near the magnet) up to 2 (diametrically opposed to the magnet).
I also observe now a strong signal from my second circuit.

Possible explanation:
As seen in Naudin's measures, the magnet acts onto the ferrite permeability. But the permeability is no more constant throughout the torus due to the fact that near the magnet the permeability is less than on the other side. Due to this permeability gradient, the magnetic flux in the toroid is no longer constant, which explains that the test loop emf is position dependant. But the flux being conservative, this means there is magnetic leakage. Because of the low permeability near the magnet, the flux lines not closed inside the toroid, close up outside. This is confirmed by the strong signal received by the external circuit only when the toroid is polarized by the magnet.

Contrary to Naudin's suggestion about the motor, there is thus reaction between the magnet rotor and the toroidal coil when the magnet is close enough to change the toroid permeability. A permeability gradient in a toroid core induces magnetic leakage. The setup becomes classical, with repulsion of the magnet by the leakage field. Thus Lenz's Law applies.

For the basic idea to be feasible (without prejudging the outcome), i.e no direct interaction between the magnet and the toroid coil during the current pulse, it is necessary that the magnet moves near the toroid while maintaining a uniform permeability. I do not really see how we could succeed in this feat with a rotation of the magnet. Only a translation keeping the magnetic axis of the magnet concentric with the geometrical axis of the toroid would be suitable. Nevertheless Steorn motor configuration, even though it is a rotation, is probably closer to this ideal case than Naudin, perhaps by using smaller toroids and farther magnets in order to reduce the permeability gradient in the toroid core.

[Larskro]

There was som bugs in the first diagram.
This one works.
See video: 7  Twenty hours on 1,25 volt.
http://www.youtube.com/watch?v=jjP5vFZZU8I

[Larskro]

This motor.

[Bruce_TPU]

The following circuit will allow a hall and mosfet switching without the need for a reed switch or additional higher voltage battery to power the switching. Only an initial pulse from a battery greater then 4.5V to charge the capacitor and the circuit will keep the capacitor charged using the back emf from the coil/coils at a higher voltage then the coil driving battery which maybe only 1-3V.

If you also had generator coils, you could just spin the rotor by hand to initially charge the cap up over 4.5V, instead of using another battery, and once the motor starts running it will self power the switching circuit.

I have been using this circuit and it works well.

Regards,

Ossie

Hi Ossie,

Do you have a self running magnet motor?

Thank you,

Bruce