Quote from: Groundloop on May 30, 2009, 07:39:49 AM
Yucca,

I think the biggest problem with a HPG is the high current and low voltage output. If we manage to make a HPG that do the opposite then all problems solved. The reason for the high current and low voltage is the metal disk very low resistance. No high voltage can or will develop in such a disk. My proposal is to use a disk made out of a material that gives us a high resistance from the center of the disc to the edge. Do you think it is a viable approach?

Groundloop.

I agree high current and low voltage creates an engineering headache, constantly fighting resistive losses.

It´s certainly worth an experiment, obtain some higher resistance metal in a thin sheet or foil form and make a disk then spin it up and compare voltage to that obtained with copper at the same RPM. My gut feeling is that the voltage would remain the same but the disc saturation current would be lower and more losses to resistive heating would be encountered. Of course before I would state this as fact, an experiment would need performing.

Note to all:
BWS on Brolis thread keeps mentioning that OU can only be achieved when the disk becomes fully saturated with current. So perhaps for any of our bench experiments we should be using very thin discs (foil) so that we can saturate them more easily without the need for excessive speed or diameter. Just something to bear in mind perhaps.

The military are using the technology in the form of superconducting
homopolar motors for a new class of US destroyer. There will be lessons
to be learned from them if we can work out how:
http://www.ga.com/atg/EMS/homopolar.php
Paul-R

Yucca,

>>said: "losses to resistive heating would be encountered."

Are you sure? Your experiment with the capacitor shows that no power can be
extracted from the disk UNTIL after the brushes on the rotor. If your statement was true then we could put a heating element on the disk and just use the heat as a output. But this will not work when the heating element is rotating with the disk.

A high resistive disk will allow the voltage dipole to be much higher but will not heat up because the real power will only manifest itself outside the rotating frame.

Am I correct here or am I thinking wrong?

Groundloop.

Quote from: Groundloop on May 30, 2009, 11:05:18 AM
Yucca,

>>said: "losses to resistive heating would be encountered."

Are you sure? Your experiment with the capacitor shows that no power can be
extracted from the disk UNTIL after the brushes on the rotor. If your statement was true then we could put a heating element on the disk and just use the heat as a output. But this will not work when the heating element is rotating with the disk.

A high resistive disk will allow the voltage dipole to be much higher but will not heat up because the real power will only manifest itself outside the rotating frame.

Am I correct here or am I thinking wrong?

Groundloop.

I´m not sure, in a normal circuit, where the source is current limited, i.e. it has significan internal resistance like a battery, then a higher resistance will drop a higher voltage of course. But in this case I think the potential will remain the same and the current will be limited, it will still obey ohms law but the current will change and not the voltage. Only an experiment would make me certain and it´s pointless to design upon this premise without an experiment to check it. If I can obtain a disk of higher resistance then I will check it.

If we did make a disk with a heating element on it, say we made a disk made of two wide concentric rings, and we put a heating element between the ring interface, then I think, provided we completed the circuit with static brushes, that the heater would heat, despite it rotating.

I agree heat is not a waste per se and could be used or at least measured for energy output, that´s why I proposed the calirometry experiment, to force most of the energy to manifest as heat and then with sufficient thermal insulation it is simple to analyse the whole systems output using just a thermometer and a stopwatch. Wouldn´t make an electric generator, but could be used in heating perhaps. Couple the technology with a Griggs Hydrosonic pump, in one unit, and it might be way overunity?

I think we need more experiments until further theorising, although theorising can be fun 

Yucca,

You can easily test the theory on your existing test rotor. First make a copper ring with the same diameter as you magnet. Then solder 4 copper wires from the ring and to the center of the ring. Now you have a low resitive disk. Measure the voltage. Now replace the the 4 copper wires with resistors. Measure the voltage. More or less voltage?

>>you said:"If we did make a disk with a heating element on it, say we made a disk made of two wide concentric rings, and we put a heating element between the ring interface, then I think, provided we completed the circuit with static brushes, that the heater would heat, despite it rotating."

If you use brushes then the heating element must be outside the rotating frame, eg. not rotating. If the heating element is rotating with the disc then there is no relative motion between the heating element and the disc, you can not extract power inside the rotating frame. You have already proven that.

I do not have any test setup right now. I contemplating buying some few Neo ring magnets with a diameter of 200mm and center hole of 20mm, thickness 5mm. But this will take 4 - 8 weeks to order. So for now I'm not able to test anything.

I will be grateful if you find the time to test the resistor theory on your rig.

Groundloop.