Magnetize U_nuclei?
I want to magnetize two U-cores, like a rectangle.
Material: TDK N87; U-core U 15/11/6
µe = 2200 ; Amin = 32mm²; mean field line length = 48mm; AL = 1.3µH
And I want at a frequency e.g. 50,000Hz (pulse/pause),
then get 250mT for example.
How can I calculate this: number of turns, current, voltage?
I don't usually tinker in the HF range.
I didn't recognize or find anything on the Internet either.
An approach or the formulas would be very helpful.
(1 votes)
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You cannot produce a rectangular field profile, because the field cannot change abruptly.
For induction B=0.25T you need
For N=100, I=40mA
This results in L=18mH
If you want to get the current in T/2 from zero to 40mA, so in 10us, you need a voltage of 80V.
That’s a triangle, not a rectangle.
To get approximately a rectangle, you should change the current faster, e.g. in 1us: Then you need 800V
And again: If you place a rectangular voltage on the coil, the current is triangular. This is the principle of each switching converter.
I=B*l/μN should be in the first formula. The result remains the same
Principle of each switching converter:
http://schmidt-walternnetzteile.de/smps/smps.html
I looked at the page, I don’t understand the mathematics, or I don’t have a transformer.
There, too, 0.2T is achieved, even with less voltage and less windings.
I have nothing against a triangular course.
How can I proceed?
I didn’t say the voltage was triangular, but the generated field.
Tell me what you want to do and what you need – I don’t think we’ll talk to each other.
Yeah, but there’s no noise against physics. that can’t be tricked. They have other switching times, other patterns.
I can only guess.
I have to go to bed by tomorrow.
Thank you very much!
I don’t need a rectangular B, but I want to drive with impulse/pause. (Arduino)
Description:
A magnet is on one side of the two U-cores, on the other side of the U-core is the mag. Path lengthens and ends again on a magnet.
The magnets also attract through the two U-cores, and form the larger one. Path.
If the U-cores are active, the river (coils + magnets) adds up and there is a superposition up to local saturation in the material of the U-core.
I want to control this local saturation with, for example, 50,000Hz.
that’s not a description to start with.
In any case, you will not get a rectangular course of the field. The rest should be guessed from your non-existent description…
These two U-cores lie or are part of another larger one. Paths
And about these U-cores, I want a local saturation within the larger one. To reach path.