Generator coil choice: Air coil? Or core coil?

[yx630514]

Hello everybody

All along, How to select the best type of generator coil, I am very confused.

While the low efficiency of the air coil, But do not have the magnetic, After the time when the rotor magnets without any resistance, Therefore: the coil and the rotor magnet can be a very small gap.

Core coil seems high efficiency, But the core has a magnetic, After the time when the rotor magnet with resistance, Between the coil and the rotor magnet so there must be a considerable gap.
Because the resistance and a large iron core coil gap should allow core coil lower efficiency.

How to Select?
Looking forward to your insights.
Thank you

[Felix_the_cat]

perpendicular wound toroid

I'm experimenting with a perpendicular wound toroid, with a wood core and the inner winding is copper plated steel. check out:Image hosting, free photo sharing & video sharing at Photobucket

[Dave45]

Iv come to the conclusion all coils are antenna's if configured right with the appropriate windings you can tap into any field density of the electromagnetic spectrum. Oscillating that antenna allows electrons to enter the antenna and be collected. Tesla said he had tapped into the cosmic rays, he done it with an antenna.

[Joit]

Hello there.
For a simple Generator Coil and Magnets, it works way better with a Core. But it will be different, when you generate Power at one Coil with an other Coil at certain Frequencies.

[kcarring]

load your coils or short them before you determine that they are not capable of creating enough drag as air cores. It's no test of the system without Lenz's law in effect.