Study of Generator Coil Acceleration Under Load (moderated)

[gotoluc]

Hi everyone,

I'm starting this topic as some of you may be interested in this video demo I made for a topic presently going on at the Energetic Forum http://www.energeticforum.com/renewable-energy/20366-your-basic-coil.html on what causes a Generator Coil to Accelerate Under Load. I know this been discuss at this forum many times and I don't care to discuss it further or even at the EF topic for that matter.
This is mostly an information topic which I will moderate, so be careful what you post if you chose to do so.

This effect is far from being new as I found out from user Erfinder that The Great Nikola Tesla had developed this in 1894 and was granted a patent (see attached).

The effect can be tuned with the core distance between the magnet rotor and the coils.

A few years back when I finally understood the AUL effect was not just about the coil geometry but also had to do with the core length.
Since then, I've been wondering what's going on in the core that is assisting this effect.

So I built a test device to further study it with all the rest of the stuff I'm doing , LOL

Here's the link to the video demo: https://www.youtube.com/watch?v=cr3x0xTqM_k

The coil used in the demo has 5.3 Ohms dc resistance and between 26 to 27mH at any point on the 1/2" round rod core.

Luc

[gotoluc]

Update,

most who have been experiencing this AUL (acceleration under load) effect may of noticed it's easier to achieve it with a higher impedance coil (more turns) then a low impedance coil and also using higher rotor rpm = higher frequencies.
Many, including myself (2 years ago) would of thought the coils Inductance was part of the effect seeing it happened with higher impedance coils.
I have now confirm (to myself anyways) that the effect is not based on the coils Inductance by testing the super low impedance coil I showed in my video.
It's inductance is 16uH with a resistance that's so low, it's unmeasurable.
With this special wounding geometry coil I can achieve AUL with the magnet rotor as low as 35Hz which is a new record for me.
The great thing about being able to achieve AUL at a lower frequency is, drastic reduction of core losses caused by eddy currents and hysteresis.

Just thought I would share my new findings

Luc

[Dog-One]

Very interesting video Luc.  Thank you kindly for sharing it with us.

So what we think is happening is the magnetic field is propagating through the core material similar to dominoes falling and like any wave, there are nodes and valleys.  When the coil is positioned in the proper location it creates a reflection back to the prime mover that is exactly in tune with its rotation.

This makes me think the coil and core is behaving somewhat like a transmission line and with a transmission line we also have impedance that must be matched.  Gets a little confusing because we have magnetic properties as well as electrical properties both in play here.

Your demonstration certainly provides a lot of food for thought.  Thanks again.

[verpies]

So I built a test device to further study it with all the rest of the stuff I'm doing , LOL
Here's the link to the video demo: https://www.youtube.com/watch?v=cr3x0xTqM_k

That's a pretty good experiment.

Note that the conductive rod core constitutes a shorted 1-turn coil that always brakes the rotor.
It is possible for the slidable multiturn coil to interfere with this braking action.

So for a clean experiment you'd need to use a non-conductive core.
Note that "non-conductive" does not mean "without magnetic hysteresis", which is an unrelated property of a material.

P.S.
Do you have a non-inductive low ohm resistor to use as an input current sensor instead of the clamp-on current sensor ?

[romerouk]

For every type of coil there is an ideal point where you can get acceleration under load. It can be done without the additional coil.
The best way is to maintain the same speed under load while the power generated is of a considerable amount.
This can be done using  a small amount of power from an external source providing voltage while the coil itself will add the amperage resulting a magnification process.
This process can also be used in a solid state configuration.