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making a big magnetic field

Discussion in 'General Electronics Discussion' started by mohammadrahimpoor, Feb 9, 2015.

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  1. mohammadrahimpoor

    mohammadrahimpoor

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    Feb 9, 2015
    hi i need to make a big dB/dt i wonder if i charge a capasitor and then discharge it in an inductance now should i use a big inductance or a small one ? i would be thankful if u answer me speceficly
     
  2. KrisBlueNZ

    KrisBlueNZ Sadly passed away in 2015

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    We would be thankful if you would ask your question specifically.

    What are you trying to achieve?
     
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  3. mohammadrahimpoor

    mohammadrahimpoor

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    Feb 9, 2015
    im trying to make a big electromagnetic pulse sir
     
  4. davenn

    davenn Moderator

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    how big, for what purpose ?
     
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  5. mohammadrahimpoor

    mohammadrahimpoor

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    Feb 9, 2015
    big enough to damage aan electrical circuit in the distance of 10 meters i want to use it as a tool to disable another robot in a robot fight
     
  6. Arouse1973

    Arouse1973 Adam

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    At 10 meters, not a chance. This would require a huge amount of energy, the components needed to do this would probably be heavier than your robot. And how would you protect your robot only being a few centimetres away?
    Adam
     
  7. mohammadrahimpoor

    mohammadrahimpoor

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    Feb 9, 2015
    well i can sheild it by metal as u know electromagnetic feild can not enter inside a metel sphere what is the most distance i can achive ?
     
  8. Arouse1973

    Arouse1973 Adam

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    Magnetic fields can certainly pass through metals. I can't help you any further sorry.
    Adam
     
  9. mohammadrahimpoor

    mohammadrahimpoor

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    Feb 9, 2015
    well if u think so just read about faraday cage here is a link

    http://en.m.wikipedia.org/wiki/Faraday_cage
     
  10. Arouse1973

    Arouse1973 Adam

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    This is way above me, one thought I have had is you could cover you robot in Lead. Lead is a superconductor so the magnetic filed can't go through it.
    Adam
     
  11. mohammadrahimpoor

    mohammadrahimpoor

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    Feb 9, 2015
    ok thanks arouse any way can u give me a hint how to make that emp ??
     
  12. Arouse1973

    Arouse1973 Adam

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    No sorry, I don't know enough to help :)
    Adam
     
  13. BobK

    BobK

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    I believe there is a rule on this forum about helping with weapons.

    Bob
     
  14. davenn

    davenn Moderator

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    you didn't read your own link very well did you ?

    they are for blocking EM radiation ( radio waves) and electrostatic charges

    what you want to do isn't possible without severely affecting your own equipment. and that is apart from the fact of the huge power requirements that Adam mentioned

    cheers
    Dave
     
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  15. hevans1944

    hevans1944 Hop - AC8NS

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    Creating a destructive EMP typically requires discharging a high voltage capacitor or a high voltage energy-storing delay line into a radiating load (an antenna) using a very fast switch. The faster the turn-on, the more high-frequency content in the radiated EMP. Pulse widths of a few microseconds and turn-on times of a few picoseconds with pulse repetition rates upwards of a few kilohertz are possible. The voltage required to generate a significant (destructive) amount of EMP energy is upwards of ten kilovolts. Stray inductance and stray capacitance and circuit resistance are not your friends as these must all be minimized. I wouldn't even consider using this technology, which is very sophisticated, as a weapon in a robot fight. It might work once, but then the opponent robot would simply "shield up" against the EMP for the next contest. Have you considered "brute force" (bigger, heavier, more power) to overwhelm the opposing robot?
     
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  16. davenn

    davenn Moderator

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    definitely the best idea :)
     
  17. BobK

    BobK

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    I suspect the robots are limited in size and weight. Otherwise someone would just use a monster truck.

    Bob
     
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  18. mohammadrahimpoor

    mohammadrahimpoor

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    Feb 9, 2015
    well if u still dont beleive me just seach protecting electronics against emp and see that the pratcital way to do it is faraday cage atleast thats what we did in university in our magnet lab
     
  19. mohammadrahimpoor

    mohammadrahimpoor

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    Feb 9, 2015
    im trying to win a robot fighting match and its compeletely legal i guess dont u think??
     
  20. mohammadrahimpoor

    mohammadrahimpoor

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    Feb 9, 2015
    well they are limited to the size and weight what im trying to do is to satisfy those rules while achiving my goal
     
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