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wow great job @Danko you are always very accurate and helpful. thank you so much for everything and your precious knowledge
Electromagnet wpt magnetic core
- Thread starter Sabro
- Start date
but I don't know about you, but to me
the field lines look pretty much the same, right??
ok i just read this edit, so it's the other way around??
Basically, the only thing that matters at any distance is the separation between the two poles, and the strength of the field at the poles. It appears to be the same in all the simulations, so, no surprise.
You can probably think of it as having a large magnet, then throwing a lot of much smaller magnets in the vicinity of the large magnet. The small ones would get close to the large one. Depending on where the small ones landed, they would orient their poles in an orderly fashion and alight with the big magnet's field.
Yes, vice versa, you are right.
Such shape of distribution force lines is "standard" for magnetic field in free space.
I think that will interested to you: https://www.nde-ed.org/Physics/Magnetism/index.xhtml
See, how coil's field concentrates in piece of μ10000 rod:
last night i reviewed the diagrams many times, and yes, at a distance of 10 cm (y) the field is 10 times stronger in the coils with a magnetic core of 10,000. but maybe there is a detail that we are missing, and that is the frequency. in fact a material with a permeability of 10,000 is certainly an amorphous like metglas, which however at those frequencies of 10 khz, whose frequency is crucial for wireless energy transfer, produces very high losses. ok after this, from what you told me, in your diagrams the coils with a magnetic core produce a stronger field and therefore also one that propagates further?? also because thinking about it what matters most to me is the amount of electromotive force at a distance of 10 cm, and therefore the frequency can help me a lot on this, so now i will use the program you recommended (vizimag) and do other checks, even at high frequencies. I'll keep you updated, if you want we can stay in touch, regards @Danko
At 10 kHz with coil 2mH and current 2 A, you need AC voltage source 250V, 2 A, 10 kHz.
But, using resonance, AC voltage source parameters should be: 1.83V, 2A, 10 kHz.
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ok very well, even if I can supply 250 volts and 2 amps of power, since my AC power supply generates up to 800 Watts, then also consider the square wave shape that helps me a lot in climbing. for the fact of the resonant system, yes I would like to use it, so that I would increase the Q factor, but I also need the two coils for the beats of waves with different frequencies, and therefore I can not use the same frequency, but maybe I have an idea let's hope it works, I can use 4 coils for example solenoid, 2 with the same frequency eg. 10 khz (for the resonance) and the other 2 with frequency eg. 10.5 khz (and here too I get the resonance) so in your opinion in this way using 4 coils, 2 pairs at 2 different frequencies, I can still get the non-linear beats?? if the answer is yes then we have arrived at an excellent goal, maybe I attach an image of the arrangement
ok very well @Danko you are always very detailed, yes then I choose the pulse shape with square waveform, maybe I start with the solenoid coil shape because in your tests it had the best results in different applications, so to conclude, with the realization of the circuit I will build an RLC circuit, with frequency chosen based on the values of capacitor and inductor, but if you have any advice to give me especially to limit the losses they are welcome. ah also which program did you use to create the waveforms and circuits in the last images???
It is simulator LTspice.
You can download it for free here:
https://www.analog.com/en/resources/design-tools-and-calculators/ltspice-simulator.html
ok perfect, last question, so considering your diagrams, if the coil has air core then the best choice is the solenoid shape, but if we add the magnetic core, which is the best shape, solenoid or horseshoe? I still can't understand this last question, always considering the pulse frequency at 10 khz at 10 cm distance
B at 10 cm will be the same with DC or with AC 10 kHz, if I*N is not changed, where I is current, N is number of turns.
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no no I was saying which shape of coil, solenoid or horseshoe, with magnetic core in both, generates greater electromotive force at 10 cm distance??
More B, more EMF.
According to diagrams in post #39:
B=1.24E-4 T with strait core,
B=2.18E-4 T with U-shape core.
hello @Danko sorry if I'm bothering you too much, but vizimag is no longer available, so it's impossible to download it, what other program do you recommend?? I'll try with "femm" and "openems" what do you think??
Right now I checked this link ( ViziMag ) from different geolocations, it works.
Unfortunately I know nothing about "femm" and "openems".
Use ferrite, as core material.
Using only one coil, you can obtain any sophisticated changes of magnetic field in time
by electrical and programming ways:
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