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  #1  
Old Yesterday, 10:45 PM
aniccame aniccame is offline
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Join Date: Apr 2015
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Terfenol d and magnetosteiction

I would like to make an electrically responsive at ultrasonic frequency terfenol d magnetosteictive rod by isolating small particles like they do with standard ferrite rods. I have the terfenol. This is to reduce eddy currents.

Any idea of where to start?

This is to replicate the graham gunderson patent that uses magnetostriction.
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Old Today, 12:04 PM
ilandtan's Avatar
ilandtan ilandtan is online now
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Quote:
Originally Posted by aniccame View Post
I would like to make an electrically responsive at ultrasonic frequency terfenol d magnetosteictive rod by isolating small particles like they do with standard ferrite rods. I have the terfenol. This is to reduce eddy currents.

Any idea of where to start?

This is to replicate the graham gunderson patent that uses magnetostriction.

Please provide the links for the gunderson patent. Look at Don Smith pdf for his circuits on his rod generators and Terfenol-D insights as an option.

This is all conjecture on my part, I don't know

If you vibrate a metal, like striking a gong, you can measure a magnetic output. If you have magnetic flux that you can turn on and off you can generate current. If you had harvesting coils around fixed magnetic fields from permanent magnets, and had some element(magnetostrictive) that you could excite to bend or disrupt the flux, you might be able to augment the effect. Of course you need to optimize the relationship with the natural resonance of the rod, the exciter coil resonance and the harvesting coil(s) resonance. It should all sing together in harmony.

There maybe a song that interacts with the Earth magnetic fields, because magnetism might be a reflection or tuned relationship from the Earth's Geo structure.

I would place a harvesting coil with a scope attached, and sweep the frequencies until I found a sweet spot. If it is a rod shape you can strike it like a tuning fork, and use a spectrum analyzer or phone app, to determine the ring frequency, that should be the natural resonance frequency. So you know what frequency to create a standing wave.

Terfenol-D is like magic, because it is not just magnetic aggregator like a ferrite rod, nor a coil that creates magnetism through current flow. I think it creates magnetism just by vibration, and I assume lots of it. They are used on sonar for subs.
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