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  1. arivel

    electro magnet

    it's very simple . a cylinder inside a tube because the magnetic field must also be channeled in the return path
  2. arivel

    electro magnet

    It's round but I don't want to use folded sheets. even solid rounds and 1002 steel tubes are not easy to find.
  3. arivel

    electro magnet

    Hello and thanks for the reply . the motivation is always the same. I've also talked about it in other posts on this forum. This is an audio speaker field coil that runs on DC. Unfortunately, pure iron and cobalt steel are not only difficult to find but also very expensive. so I thought of...
  4. arivel

    electro magnet

    Hi everyone . I would like to understand if it is possible to create an electromagnet in an iron-silicon alloy (FeSi). I don't have the equipment to do it myself so I thought of two different ways to proceed but I'm not an expert in these things and therefore I can't know if they are two viable...
  5. arivel

    material without hysteresis

    but what you're saying ?
  6. arivel

    material without hysteresis

    if I asked for a material with magnetic permeability it means that it is AC. it doesn't work in DC. what I wrote in the first message is clear, "without hysteresis". I didn't write: with little hysteresis.
  7. arivel

    material without hysteresis

    what makes you think that the ferrite is free from hysteresis?
  8. arivel

    material without hysteresis

    if you know they exist then why not post a link? ​
  9. arivel

    material without hysteresis

    Hi everyone. can you advise me please? I am looking for a solid material without hysteresis with a relative magnetic permeability that goes beyond unity. I don't pretend that it is on par with permalloy or mu-metal but I can be satisfied with a value that is close to 10, if it surpasses it even...
  10. arivel

    current sensor based on magnetic induction

    its impedance changes with frequency
  11. arivel

    current sensor based on magnetic induction

    this is what I got using 15 connected toroids. I used a 20 - 20 Khz sweep signal and as you can see the user is a speaker. no amplification of the signal coming from the current sensor. Don't ask me how much current I passed because I didn't...
  12. arivel

    current sensor based on magnetic induction

    50mA peak-to-ground voltage. each toroid is wrapped in many turns of wire but only one layer. this is because for the moment it is a test that I want to do to see what we get. if the result is satisfactory I can even do more than one lap. remember that I have to wind many toroidal rings all by hand.
  13. arivel

    current sensor based on magnetic induction

    @3DDave AC
  14. arivel

    current sensor based on magnetic induction

    no
  15. arivel

    current sensor based on magnetic induction

    sorry but there are some errors. each individual toroidal ring measures an inductance of 0.0000013H the copper enamelled wire has a section of 0.2 mm
  16. arivel

    current sensor based on magnetic induction

    Hi everyone . I want to make an alternating current sensor for audio frequencies (20Hz-20KHz) for current starting from 50mA. many very small toroidal plastic nuclei (therefore air permeability) placed next to each other to form a straight line because the current conductor passes through the...
  17. arivel

    magnetic field produced by a current flowing in a conducto

    @3DDave There are controversial answers on the internet. some say that it is uniformly zero and others say that it is zero only at the axis and increases as one approaches the internal surface.
  18. arivel

    magnetic field produced by a current flowing in a conducto

    I don't want to calculate it, but I would like to know if it is present or absent.
  19. arivel

    magnetic field produced by a current flowing in a conducto

    why does it say that there is no electric field and no current? . Maybe because it refers to a radial field? . in my case the tension is applied to the two ends of the tube.
  20. arivel

    magnetic field produced by a current flowing in a conducto

    Hi everyone . Can you clarify something for me? if a current flows in a linear copper wire, a magnetic field is created arranged on a plane orthogonal to the conductor of electric current. if instead of a full section copper wire I use a copper or aluminum tube, is there a magnetic field inside...

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