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

[gyulasun]

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See Figure 3.11: http://books.google.com/books?id=cYaQAOCuygcC&pg=PA55

(I wish I could find a "permeability vs. saturation" graph like this for Metglas or Finemet.)
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Hi 0c,

I did some search but here is only one link I managed to find for MAGNAPERM material permeability vs saturation graph, all the other types are for request only...

http://www.metglas.com/products/page5_1_6_1_6.htm 

rgds, Gyula

[Airstriker]

Ok 0c nice post indeed and seems I still need to learn quite a bit
But there is one thing I don't understand if it's the way you say it is. Why does ORBO have such a big air gap between magnets and toroid ?
Also note that if you don't have a drop in permeability at TDC you will not have an inductance gain later.

PS. To be honest the more we're analysing this machine the more I get confused ;] Still so much to understand and so low on time

[Omega_0]

I'm sure you guys know of the Curie motor:

http://www.youtube.com/watch?v=RWrTvB-oK94

Is this ou ? Because all input is going to towards heating. Actually the input is only pure heat.

Gadolinium's Curie temperature is around 17 to 20 deg C, which is ideal for such a motor.

[mondrasek]

You have to saturate the core to have the rotor going.

Not completely, but the more saturated it is, the less resistance there will be to the rotor.

Exactly.  This is why (most) replications show a relationship between electrical input power and rotor RPM (torque).  They are not driving their cores necessarily into complete saturation (or, say 98% saturation).  So they still have a considerable braking effect on their rotor magnets while the toroid coils are energized and rotor magnets are moving past TDC.  In effect, they are only canceling a portion of the attraction the rotor magnets have towards the toroid cores. 

So it is very possible to make a rotor spin without saturating the cores (by the rotor magnets or the electrical input).  And such devices will show the characteristic of higher RPM for higher electrical input power, which many believe proves the electrical input power must cause the rotation.  But at a high enough electrical input power the cores will approach saturation and fully "release" the rotor magnets and so additional RPM increase will not be seen.

Driving the core to saturation is not necessary to make a rotor spin, but it is important for maximizing rotor torque.  But, on the other hand, driving the core to saturation takes ever increasing amounts of electrical input power, so you have diminishing gains of torque.  There should be an optimal point where rotor torque PER input electrical energy is maximized.  Just maximizing torque (at the expense of high input electrical power), or minimizing electrical input power (while sacrificing rotor torque) cannot be considered.  It is the correct balance of both of these design criteria for any core material and magnet strength selection that needs to be the focus of an optimized design.

Please consider all of the above just my humble opinion, of course.

This all leads to the requirement to select an appropriate core material.  The core material selection would necessitate the selection of a commercially available toroid (at least right now).  The selected toroid would then, through proper analysis, drive the selection of the appropriate rotor magnets, winding (wire gage and number of turns), and the physical dimensions of the component placement (rotor diameter, gap, etc.).  At least that is how I see it from an engineering point of view.

M.

[0c]

@freeorbo,

I think you should spend more time trying to understand the behavior Steorn has displayed. Much of your post is confused or completely wrong. You could probably gain quite a bit from the Alsetalokin and Naudin replications and analysis.

@Gravityblock,

In the past, I recall seeing some academic papers which discussed the A field potential. It's not something I understand and doesn't seem to show up in my "visions". I'm afraid I can't help with that.