I was just browsing through this thread last night,and woke up this morning with an odd idea.
Probably no good to anyone in regards to how the TPU work's,but i went ahead and built it anyway--just to see what would happen.
So the idea is to take a length of thick copper wire(in this case the core wire is 1mm),and wrap that length of wire with a smaller gauge wire(in this case .55mm)
As there is over 1000 turns to make,i decided to throw together a quick motor driven winder--first pic.
It has a motor at one end,and a bearing head at the other,which allows the core wire to rotate with the motor.
Last pic shows the winding in progress--it worked better than i had hoped
Second pic-I then took this wrapped combination,and wrapped it around a toroid core.
The core is one i made myself using DEVCON liquid metal.
The .55mm wire(the wire wrapped around the 1mm core wire)has a 1 ohm CSR on the ground side(ch2 blue chanel). CH1 is across the CSR and .55mm coil.
The inner core wire has a 1 ohm CSR across it,and CH3 is showing the signal across the core winding.
I was not expecting anything to happen,but was surprised at the results.
1st scope shot shows all 3 traces,where the(what we will call)secondary (CH3) shows the RMS value across the 1 ohm load resistor,and the calculated P/in. The P/in value is on the high side,as the voltage trace (CH1) also includes the voltage across the 1 ohm CSR.
The second scope shot shows P/in when the 1 ohm load resistor is removed from the core winding.
Oddly enough,the P/in go's down very little when the load is removed.
Best results are had around 532KHz,which is what the scope shot tests are run at. But the effect starts as low as 50KHz.
Perhaps the poynting vector field plays a part in this?
This was just a quick throw together DUT.
As you can tell,the winding around the toroid is not very neat(it was getting close to 45*C in the work shop at the time),and the toroid core it self is of poor quality.
I also think a longer core wire with more turns of the smaller outer wire around it,and more turns of the combination wires around a good ferrite toroid would result in a far greater efficiency.
I believe this system could produce much better results if more time was taken with it.
I was looking for a way to accelerate the electrons,and this idea just popped up.
Probably not doing as intended,but i am surprised at how efficient the transfer of electrical energy is from primary to secondary in this winding configuration.
It may be of some use,it may not,but this is what i got from the quick build and test.
Brad
Never let your schooling get in the way of your education.
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Topic: Some "New" Observations (Read 304000 times)
