Latest: No back torque generator.

[gravityblock]

Below is a picture showing how the current should flow in a disc with an inverted magnetic field.  The dotted lines show where the magnetic material of the magnet is replaced with copper to electrically connect it to the disc and to invert the magnetic field.

The arrows show how the current should flow in the disc and over the area of the disc where the inverted magnetic field is located.  The current will change directions over the inverted field to provide a return path that our external circuit normally provides.  A capacitor with the leads connected to the disc of the inverted portion of the field should show a current is produced and is able to be taken off the disc using an external circuit.


GB



   

[broli]

I'm flattered this thread is brought back to life.

GB you're bring up some good stuff. I believe you are on to something with the pole reversal. If my whole research is correct current can flow without any brushes. If that's the case one can instantly conclude that current cant flow with brushes as well not only without any backtorque, but actually with a positive torque causing acceleration.

[Mk1]

http://www.disclose.tv/viewvideo/29990/Dr__Steven_Greer_The_Promise_of_New_Energy/

[exnihiloest]

...
The external circuit has a more important role in the conventional setups, and that is to provide a return path to allow current to flow.  If the current is flowing from the axis to the rim on the disc and is also flowing in the same direction from the axis to the rim in the external circuit, then there is no net current produced.
...
In the setup with the inverted magnetic field, the external circuit is not providing the return path for current to flow, but is only required to extract current from the disc. As long as the current is flowing in the disc in one direction, and is flowing in the opposite direction where the inverted magnetic field is located, there will be a current produced that can be extracted with an external circuit.

You are right when you say that "there is no net current produced" but the reason you gave must be completed.
The return path can be done through a conductor that is either shielded from the magnetic field or farther from the magnet in order to unbalance the currents generated in each path and get a resultant current.
Nevertheless some have tried (including experimental physicists) and failed.
Instead of shielding the return path you can even reverse the field of this path as you suggested. It will not work better.
The reason in both cases is that the magnetic flux is conservative. Thus no matter the circuit. The key point is the flux it will embrace. As you are using magnetic dipoles and not magnetic monopoles, the flux entering and exiting a closed loop is always balanced.
Either you accept that Maxwell equations are relevant to describe the setup, and no current can be expected, or you assert that new physics is involved to describe the setup and then a current could flow according to new laws of nature. But in this second case you cannot use conventional layman terms of electromagnetism to prove it.

[gravityblock]

@ broli:  It's good to know that your own research has led you to the same conclusions that brushes may not be needed in order for current to flow, at least in theory.


GB