Naked Science Forum
On the Lighter Side => Science Experiments => Topic started by: hamdani yusuf on 21/05/2023 22:18:39
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Let's Experiment with an Electromagnetic Chain!
Have you ever seen an electromagnetic chain? Its a series of electric and magnetic toroid cores linked in the form of a chain transferring power from electricity to magnetism and back again as it works it way along the device. Its a great hands-on illustration of Maxwell's equations as well as an illustration of transformer action taken to extremes.
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A Magnetic Amp and Core Memory
Have you ever seen a magnetic amplifier? It uses nothing other than magnetic saturation to control a high power load using low power inputs, a technology that was used before we had high power semiconductors. And on top of that, we can also use the same setup to demonstrate the principles behind magnetic core memory which was used in early computers.
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I've recorded some experiments to investigate electromagnetic couplings using induction heating circuit that I used in my videos of induction heater. But in this case, the heating coil is not used to heat ferromagnetic objects. Instead, it's used to induce electromagnetic field around another identical coil, which is then measured by a voltmeter.
I also measured when the coils were overlapping, and found out the effects of a ferrite core on the electromagnetic couplings.
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Have you mistaken TNS for a blog site?
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Have you mistaken TNS for a blog site?
What makes you think that way?
What kind of experiment do you think is appropriate to be posted here?
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What kind of experiment do you think is appropriate to be posted here?
"Discussion of science experiments on the show or to do at home"
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What kind of experiment do you think is appropriate to be posted here?
"Discussion of science experiments on the show or to do at home"
That's what I tried to post here.
Famous experiments are already explained somewhere else, like textbooks and encyclopedia. It's more interesting to discuss less known experiments, or some variations of well known experiments, where we can learn something new.
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Here's my first video experimenting on magnetic coupling. I used the induction heater circuit from my previous videos on induction heating.
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Here's the follow up video demonstrating the effect of ferrite rod on magnetic coupling between primary and secondary coil.
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Great stuff!
Many thanks for the magnetic amplifier video - it took me back nearly 60 years to using Acromag magamps to detect very small currents in a linear accelerator. As the man said, we had no high-voltage transistors and vacuum tubes produced a lot of heat and were a bit fragileso magamps were favored for guided missile control systems as they are utterly robust and useful servo drivers, but I was interested in their very low inherent noise. Must have a couple in the workshop drawer somewhere!
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The next experiment I'm planning will use a secondary coil with same number of turns but larger diameter. Thus I can put the ferrite rod outside of the primary coil, but still inside of secondary coil.
Let's make it more interesting and interactive. I'll give thanks to anyone who make correct prediction. A bonus for those who comes up with interesting reasoning.
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Let's make it simpler. The voltage of secondary coil is measured in three conditions.
First, without ferrite rod.
Second, the ferrite rod is inside the primary coil, which is also inside the secondary coil.
Third, the ferrite rod is outside the primary coil, but is still inside the secondary coil.
Which condition produces the lowest voltage?
Which is the highest?
What is your explanation?
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The video turns out to be much shorter than I anticipated. I haven't come up with an explanation which is consistent with all observed results. Thus I decided to simply present the raw results.
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This video continues our experiment in exploring magnetic coupling using induction heater circuit and ferrite rod. It shows the different results in three conditions: without ferrite, ferrite inside primary coil, ferrite inside secondary coil.
The results here seem to contradict the results in previous video, where the voltage was higher when the ferrite rod was inside of secondary coil more than inside of primary coil.
Other interesting result is the generation of DC voltage in secondary coil in certain position of ferrite rod. It seems to open the possibility to produce DC voltage using only passive electronic components. Usually, we use rectifying diodes, which are active components, to do the job.
I'm aware of the possibility that this DC generation was caused by the characteristics of transistors driving the primary coil.
I'm planning to make a follow up video to clear up this issue.
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DIY METAL DETECTOR, Gone Wrong and Right!!
With few incidents, I think I made what is called a BFO metal detector, which actually works very well over a large distance.
By: Mehdi Sadaghdar
0:00 Wrong Way of Detecting Metal
1:48 Theory Behind How Metals Effect Inductance
6:10 More Fake and Real Metal Detector Video Tutorials
7:32 Designing a ?Simple? Metal Detector Circuit
15:48 Testing the DIY Metal Detector Circuit
Here is a video of making a metal detector using the principles of magnetic coupling.
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I've finished editing a new video investigating magnetic coupling. This time, the secondary coil is twisted to form an 8 figure. The effects of a ferrite rod are also shown by inserting it to the primary coil, as well as the secondary coil.
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In the Videos which you Create...
Is TNS ever mentioned or referred to?
Like say, what if Someone watches your Video & would Like to have a long lengthy sensible discussion on the Topic/Subject.
By the way, are General Members of the Forum even Allowed to mention TNS on Other places.
Do you Know?
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In the Videos which you Create...
Is TNS ever mentioned or referred to?
Like say, what if Someone watches your Video & would Like to have a long lengthy sensible discussion on the Topic/Subject.
By the way, are General Members of the Forum even Allowed to mention TNS on Other places.
Do you Know?
I rarely mention TNS in my video, but I did when someone asked in the comment section.
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I've finished editing a new video investigating magnetic coupling. This time, the secondary coil is twisted to form an 8 figure. The effects of a ferrite rod are also shown by inserting it to the primary coil, as well as the secondary coil.
Here it is.
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This short video shows how the effect of electromagnetic coil to a current carrying wire.
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NO ELECTRICITY Electromagnet?!? The Weird and Wonderful Permanent Electromagnet
Have you heard of a permanent electromagnet? Magnets are usually permanent or electro, but the magnet featured in this video is both?
How does it work and how do you make it work? What's the point of it?
So many questions for this hybrid magnet technology. Let's find out!
Perhaps we can say this is a coupling between permanent magnet and electromagnet.
I wonder how much current is needed to overcome the hysteresis and make it unmagnetized permanently.