The homotenna (homopolar motor + antenna).

[broli]

Oh boy.

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[WilbyInebriated]

my apologies broli. sometimes the boxing gloves are too hard to put aside...

[Qwert]

http://en.wikipedia.org/wiki/Pythagorean_theorem



so you are saying that 'law' and 'theorem' are synonymous. your semantic argument is as lame as the rest of your arguments... you might as well return to your logical fallacies. if you chose again to refuse to respond with a cogent argument, i will not reply.

http://en.wikipedia.org/wiki/Theorem

[WilbyInebriated]

http://en.wikipedia.org/wiki/Theorem

thank the flying spaghetti monster! someone who understands words and their definitions...

so was the wink because "Theorems in mathematics and theories in science are fundamentally different in their epistemology"

or because "For example, the Collatz conjecture has been verified for start values up to about 2.88 × 1018. The Riemann hypothesis has been verified for the first 10 trillion zeroes of the zeta function. Neither of these statements is considered to be proven. Such evidence does not constitute proof."

or was it something else entirely?

[broli]

The latest thread on homopolar motors made me think about some old concepts again, one of them being the "homotenna" idea.

I had this new idea and thought it was worth sharing at the very least.

The concept is simple, you have a coil wrapped around a ferrite core. This would be your rotor. Then both ends of this coil are connected to rings sliding against brushes leading to your exterior circuit. One lead of this circuit is electromagnetically shielded.
The circuit is then energized with HF AC, the high frequency being crucial and somewhere between 10kHz-1Mhz so the shield can do its job shielding the electromagnetic field.

The theory behind it is also simple. We already know that the external circuit in a homopolar motor causes the torque on the disk/magnet assembly. However if the below concept were to be energized with DC current both external wires would cause an equal but opposite torque on the rotor assembly leading to no motion. But if we were to replace the PM with an EM and fed it with HF AC current through the stationary leads AND we can shield one lead completely so its EM field becomes invisble to the rotor then a net torque could arise. Since both the current in the coil and the current going through the external circuit lead are the same and synchronized, this should lead to a torque acting only in one direction on the rotor. And since there's no coil part going from rim to center, there should be no induced back emf.

The key here is the shielding of the field of one lead and making it disappear to the rotating magnet. This is much more efficient than the antenna idea as currents can be higher and frequency lower.