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Thanks, Carl.
That's actually Chemelec's coil winding jig. And, yeah, the way it's all clamped, only the center can turn, on the inside.
The needed size and inductance of your coil will depend on the size and weight of the magnet, as well as how quickly you can dump the power through the coil. The same number of Joules, in a shorter time, will produce a stronger kick against the magnet. Remember that power is energy divided by time. One Watt is a Joule applied over a period of one second. The same energy applied in a tenth of a second would produce 10 Watts of power. So your coil's time constant will be the limiting factor, although higher voltage will give you more amps, with a given resistance, and this will produce more power in a given amount of time. Your #20 gauge wire seems to be optimal.
The core material could be soft iron (or ferrite), so that it doesn't retain a magnetic field. Copper coated welding rods work well, as does the black tie wire used with rebar. Some people even use threaded rod, as long as it isn't harder than Grade 3. Tesla used an air core, but remember his coil was a few feet in diameter, and wasn't used for magnetic repulsion.
If you're hoping for Radiant Energy, you'll have to have biphasic power. You'll need to apply two signals to the bifilar coil, 180 degrees out of phase with each other, from oposite directions. The frequency of these signals should match the transit time of the coil, as if the coil were a long wire antenna. So the circuit will need two branches , with both branches having the coil as a common element. In the alternative, you could use a single circuit with a spark gap, and allow the spark's crackling to produce the phases, hit or miss, from moment to moment, with the phase variance resulting from the combination of two different frequencies, from the same direction. This will depend a lot on the length of your spark gap.
It sounds like your upcoming power supply is biphasic. But the supply frequency will have to match the coil's resonance. You may have to build a stacked coil, and adjust the interlayer capacitance. And/or you may have to raise the frequency of the transformer. For instance, a transformer will also work at 6,000 Hz, if you had an inverter which ran at that frequency.
Good luck with your project!
That's actually Chemelec's coil winding jig. And, yeah, the way it's all clamped, only the center can turn, on the inside.
The needed size and inductance of your coil will depend on the size and weight of the magnet, as well as how quickly you can dump the power through the coil. The same number of Joules, in a shorter time, will produce a stronger kick against the magnet. Remember that power is energy divided by time. One Watt is a Joule applied over a period of one second. The same energy applied in a tenth of a second would produce 10 Watts of power. So your coil's time constant will be the limiting factor, although higher voltage will give you more amps, with a given resistance, and this will produce more power in a given amount of time. Your #20 gauge wire seems to be optimal.
The core material could be soft iron (or ferrite), so that it doesn't retain a magnetic field. Copper coated welding rods work well, as does the black tie wire used with rebar. Some people even use threaded rod, as long as it isn't harder than Grade 3. Tesla used an air core, but remember his coil was a few feet in diameter, and wasn't used for magnetic repulsion.
If you're hoping for Radiant Energy, you'll have to have biphasic power. You'll need to apply two signals to the bifilar coil, 180 degrees out of phase with each other, from oposite directions. The frequency of these signals should match the transit time of the coil, as if the coil were a long wire antenna. So the circuit will need two branches , with both branches having the coil as a common element. In the alternative, you could use a single circuit with a spark gap, and allow the spark's crackling to produce the phases, hit or miss, from moment to moment, with the phase variance resulting from the combination of two different frequencies, from the same direction. This will depend a lot on the length of your spark gap.
It sounds like your upcoming power supply is biphasic. But the supply frequency will have to match the coil's resonance. You may have to build a stacked coil, and adjust the interlayer capacitance. And/or you may have to raise the frequency of the transformer. For instance, a transformer will also work at 6,000 Hz, if you had an inverter which ran at that frequency.
Good luck with your project!
.-Gary
The Lord shall provide!
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