Bridging coil to extend the magnetic field of strong magnet

[bs2012]

Just come up with an idea:

- put a strong magnet besides a generator coil
- the generator should outside the magnetic field of the strong magnet
- put a bridging coil in between the strong magnet and the generator coil
- power up the bridging coil with pulse, magnetise the coil in opposite pole to the strong magnet
- the magnetic field from the strong magnet could then inducted to the generator coil
- collect power from the generator coil

Please comment this set up.

[cristache]

Will not work. Here is why
Assume the generator coil has magnetic field from the magnet.
When you put energy into the bridge coil to reduce the field in the generator core, the induced voltage in the generator coil will have such a direction to oppose the flux reduction, so your bridge coil will have to compensate for that - more energy
What you get is a sort of transformer, with your bridge coil being the primary and generator coil being the secondary with the field biased by the permanent magnet.
And is an inefficient transformer since the magnetic flux is not closed into itself and there is a lot of flux leakage.

[bs2012]

Hi cristache,

Assume the generator coil has magnetic field from the magnet.
When you put energy into the bridge coil to reduce the field in the generator core, the induced voltage in the generator coil will have such a direction to oppose the flux reduction, so your bridge coil will have to compensate for that - more energy

Seems you have missed my assumption that the generator coil is positioned outside the magnetic field from the magnet.

Only when energy is put into the bridging coil, the magnetic field from magnet could reach the generator coil.

What the generator coil could get is the magnetic field from the bridging coil plus the magnetic field inducted from the magnet.

[cristache]

Still a very inefficient biased transformer.
Use Femm 4.2 to simulate. You will see you will have to put A LOT of energy into the control coil if the core is air.
If the core is iron the magnetic field of permanent magnet will penetrate the core
Either way you get the same thing

[TechStuf]

Get some hands on BS....You're thinking outside the box.  You need to think with one hemisphere inside and one outside the box.  Your work would bear more fruit if you combine a halbach ring, a magnetic beam amplifier, and a coil of correct geometry.


TS