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  1. Fabio88

    Solenoid design

    Only radiation (I agree that's dangerous for solenoid integrity but we usually run coils in vacuum, maybe I'll need a lower current density..) Problem is also the impedance of this inductor, i'll probably need a matching network otherwise the power supply is going to be damaged or not going to...
  2. Fabio88

    Solenoid design

    At the end I manage to understand that to create 50G in the gap without a core one has to use several windings so I don't have enough space for the second coil. So now the problem is to design a solenoid able to produce 50G on his axis at 1" distance. I found that with 1mm diameter wire and...
  3. Fabio88

    Solenoid design

    Oh thanks, didn't know the definition open/close circuit.. Wow, that's great, do you have an analytical relation between ID and ration between core and air gap or you're using a software? If I know what you're using I can perform a parametric study on that and find out the optimum ID or even...
  4. Fabio88

    Solenoid design

    Oh yes sure, I was not sure about the interpretation of 'open circuit' but maybe you meant air circuit. I have probably already saw that link but I will double check it for sure, thanks! Ps any comment about the geometry?
  5. Fabio88

    Solenoid design

    ...I'm not sure where the link is :( And what do you mean with tens of permeability at open circuit?? So finally the ratio between core and gap field is really high..what about optimizing the geometry so that this ratio goes down? Do you think would be an improvement using the Helmoltz...
  6. Fabio88

    Solenoid design

    I thought ferrite would be good but since I've trouble calculating the Inner B able to create the 50Gauss in the air gap I cannot evaluate if there is the risk that ferrite saturates..
  7. Fabio88

    Solenoid design

    Thanks a lot for your help; while doing my simple calculation I had a curiosity: how does the B field in the air gap change using differ material in the core of the two solenoids? I can't understands the relation between the permeability of the core of the solenoid and the value of B in the air...
  8. Fabio88

    Solenoid design

    Hi all! I would like an advise about how to choose the proper dimensions of two solenoids: I would like to have them with air core, internal max diameter 4 mm, external max diameter 8mm, maximum length 2cm. Now: these solenoids are going to be operated at 30kHz sinusoidal current so the...
  9. Fabio88

    High temperature, high frequency magnetic circuit

    Hey MagBen, actually the DC operation of this circuit has been already extensively tested: I'm working on an existing satellite thruster called Hall Effect Thruster (there's a lot of material on google just to have an idea of how this stuff works) and whit a front plate (pure iron) of 5"x5" and...
  10. Fabio88

    Core material question

    And what if the laminations are facing each other not parallel put at 90° each other? To understand what I mean: take a squared rod of laminated metal, cut it into two part and then rotate one of the two part of 90° along the axis of the rod..
  11. Fabio88

    High temperature, high frequency magnetic circuit

    IRstuff: I can't get what do you want to suggest me with the comment on the dimension of the plate.. With regard to the 30kHz I think it's only a matter of finding the right material and proper geometry, there are a lot of transformer working at that frequency and much higher...
  12. Fabio88

    High temperature, high frequency magnetic circuit

    So do you think that the steel of the inner central rod can conduct the AC field even if the material is not good for AC (but it will be a poor result)? And that's why you are suggesting me to use air as a ruturn path? I'm going on asking this because the problem is that the inner round plate...
  13. Fabio88

    High temperature, high frequency magnetic circuit

    EdStainless could you please explain to me again the issue about the return path of AC? You wrote to me 'Don't try to push the high freq AC through a return path' but I can't exactly understand what you mean.. With regards to the shape of the circuit, I'm not sure that I weel understood the...
  14. Fabio88

    High temperature, high frequency magnetic circuit

    Hi Magben and thanks for your opinion! At the moment the magnetic circuit is already built, the core of the coil are probably made of steel (we don't know which kind) and the plates are pure iron. It works more or less as you thought: we use a dc biase to generate the radial B field (roughly...
  15. Fabio88

    High temperature, high frequency magnetic circuit

    I can confirm you that we'll develop a cooling system to prevent temperature going too up..since it will be a very simple cooling loop we cannot be sure that temperature will be perfectly homogenous but let's say that there are not going to be parts with a temperature over 200C; this should...
  16. Fabio88

    High temperature, high frequency magnetic circuit

    With regards to the wire, I’m probably going to use Litz Wire with fiberglass or Kapton insulation and maybe run a spiral copper pipe as a first row on the core.. I probably need an equivalent 20AWG Litz Wire so that I can push a relatively high current and use less turn in order to have a...
  17. Fabio88

    High temperature, high frequency magnetic circuit

    Thank you for your help! I’ll try to give you some more info: The most strict requirement is the B value in the air gap: it should be more or less 300 Gauss in a radial direction between inner and out circular plate and so I’m worried about saturation in the ferrite since the plate near the...
  18. Fabio88

    High temperature, high frequency magnetic circuit

    Hi all, I'm trying to build a magnetic circuit (custom geometry, see draw) and having a lot of trouble with the material choice.. Biggest problem: temperature (probably up to 350-400C) if necessary a cooling system can be realized but temperature would not be less than 200C for sure. Now I...

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