Magnet Inductance Boost with Finemet nanocrystaline core

[gotoluc]

Hi everyone,

It's been a while since I posted a new video!

Lately I've been thinking of applying what I personally learned while working with Thane Heins at the Ottawa University a few years back. I'm now considering of re-testing Thane's high Inductance coils with new core material and biasing magnets.

A little over a year ago a researcher named Eric YouTube user ericsclips: http://www.youtube.com/watch?v=PuzSkKlnCzc
He also shared his findings at this Forum: http://www.physicsforums.com/showthread.php?t=399801

What he found was that a coil wound on a Finemet toroid (nanocrystaline) core would increase in Inductance as much as 3 time when approached to a magnet (up to a certain point)

I do have 2 of theses Finemet toroids so I wound a coil on one to test it.

The idea here is to use Finemet as core material on Thane's delayed Lenz coil technique. This may give a huge advantage as we could achieve higher than expected Inductance using minimal wire lengths.
High Inductance is the key factor to Thane's coil effect and the benefit of using less wire is not just less cost but it reduces the coils resistance which in turn gives more current output.

Here is the video of my test so far: http://www.youtube.com/watch?v=_cCYKChCFqk

I also included (below) the two scope shots from the video demo test.

Please post your comments.

Thanks for looking

Luc

[toranarod]

Hi everyone,

It's been a while since I posted a new video!

Lately I've been thinking of applying what I personally learned while working with Thane Heins at the Ottawa University a few years back. I'm now considering of re-testing Thane's high Inductance coils with new core material and biasing magnets.

A little over a year ago a researcher named Eric YouTube user ericsclips: http://www.youtube.com/watch?v=PuzSkKlnCzc
He also shared his findings at this Forum: http://www.physicsforums.com/showthread.php?t=399801

What he found was that a coil wound on a Finemet toroid (nanocrystaline) core would increase in Inductance as much as 3 time when approached to a magnet (up to a certain point)

I do have 2 of theses Finemet toroids so I wound a coil on one to test it.

The idea here is to use Finemet as core material on Thane's delayed Lenz coil technique. This may give a huge advantage as we could achieve higher than expected Inductance using minimal wire lengths.
High Inductance is the key factor to Thane's coil effect and the benefit of using less wire is not just less cost but it reduces the coils resistance which in turn gives more current output.

Here is the video of my test so far: http://www.youtube.com/watch?v=_cCYKChCFqk

I also included (below) the two scope shots from the video demo test.

Please post your comments.

Thanks for looking

Luc

is the square part of the pulse the load time?

thanks for sharing.

[gotoluc]

is the square part of the pulse the load time?

thanks for sharing.

Yes, it is the on time. Both have the same on time.

Thanks for looking

Luc

[firlight]

Hi Luc
               With regards to the increase of core inductance,This is quite normal.as these
  cores are "Square Loop" .Bringing the core close to a bias magnet will push it into
a high permeability zone of the core.For your interest this effect will also occur  in other non tape wound cores ,but are Square Loop..i know this having worked with square loop cores in the construction computer memory stores in the 1950`s.
You will find the toroid's make really good pulse motor drivers.
also check this out.

http://www.metglas.com/downloads/finemet_magamp.pdf
Just another point 3R1 cores are a lot cheaper than the tape wound.Here is some info.http://www.ferroxcube.com/appl/info/square.pdf
Also if you are in the UK you can get them from |Farnell
Best Regards Dave

[Kator01]

Hi Luc,

lecture on kinetic inductance Lk. Pay notice to his remark about thin-films. This finemet inductors are made from thin-film-layers.

http://www.youtube.com/watch?v=MAHkYROmriY&feature=related

Besides this- there is no increase in the inductance as the negative spike amplitude is decreased. Also the area the first curve containes is also decrease meaning : the magnetic energy is reduced. The meter is fooled as the oscillation is damped as it is clearly seen in you vid. The higher fourier-components 2nd, 3 rd and 5 th are strongly damped. Look at the decreasing slope and the damping of the negative overshoot at the cut-off.
These finmet-core are especially designed for damping high frequencies running along conductors and doing their job well.

This physicist should know this.

These cores are interesting in that you can use them for delaying the collapse-time of the magnetic field whe used in series with the coils in a mull-generator - thus one will be able to control the point in time the anti-lenz appears.

Regards

Kator01