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Wire gauge for electromagnet?

Discussion in 'Electronic Projects Design/Ideas/Reviews' started by BroncoDave, Apr 30, 2014.

  1. 4pyros

    4pyros Well-Known Member Most Helpful Member

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    200 amps? You will be limited by the internal resistance of the other batteries.
    The 200 amp starting setting on the charger is limited as to how long you can run it without burning up the charger.
    It can only be used for a short time before everything overheats.
     
  2. MrAl

    MrAl Well-Known Member Most Helpful Member

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    Hi,

    See my post #100 first where i replied to your new two coil config.

    You dont want to cause a meltdown either. 200 amps is a lot of current, that's enough to weld.

    Also as 4pyros points out, if you use a battery charger the 200 amp setting is probably for a "jump start" or "boost start" where you are only allowed to draw that much current for around 15 seconds. After that you may have to allow for a cool down time of as much as 15 minutes before you can do that again, and that is because of the heating and cooling properties of the transformer they use in the charger. The heating time is much shorter than the cooling time, but you can check your spec's on that charger.
     
  3. BroncoDave

    BroncoDave Member

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    Hey MrAl, I am using the same core. I just moved the coil over and added another coil. The core itself is the one that came with the transformer. And I was thinking the same thing about the 100th post. The charger is intermitent on the 200 amp setting and thermally protected. On for 5 sec. and off for 35 sec. And I will only be using the 2 - 6v deep cycle batteries in series.
     
    Last edited: May 9, 2014
  4. dave

    Dave New Member

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  5. alec_t

    alec_t Well-Known Member Most Helpful Member

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    I suspect that will be the case, if the original coil occupied the whole winding window around the centre leg (and it looks from the pics as though it did).
     
  6. BroncoDave

    BroncoDave Member

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    Man this IS a tuff crowd. Not even a chuckle at my blonde jokes. They have the same number of turns. I haven't changed the number of turns on the coils, just moved them from one leg to the other.
     
  7. 4pyros

    4pyros Well-Known Member Most Helpful Member

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    You still going one about your dumb charger. LOL
     
  8. BroncoDave

    BroncoDave Member

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    LMAOOL!!!!! I get it.
     
  9. ronv

    ronv Well-Known Member Most Helpful Member

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    Just wanted to let you know I like your blonde jokes. :rolleyes:
    Have you ever measured the voltage at both ends of your long wire with the magnet hooked up?
     
  10. tvtech

    tvtech Well-Known Member Most Helpful Member

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    We are actually a good bunch of Folks...but it is soooo easy to take a thread off topic and then the "Newbie" asking for help is left between a rock and a hard place. And that does not help :wideyed:

    Especially in your case Bronco...because that is exactly where you are right now :eek:

    All the best,
    tvtech
     
    Last edited: May 9, 2014
  11. BroncoDave

    BroncoDave Member

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    Thanks ronv. Yes I have. 4-5v no matter how many volts I put out.

    Yep, but that's ok. Gotta have a little fun once in a while.
     
  12. tvtech

    tvtech Well-Known Member Most Helpful Member

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  13. BroncoDave

    BroncoDave Member

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  14. BroncoDave

    BroncoDave Member

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    The biggest diode radio shack carries is 3 amp. anybody know where to find a couple 75 amp press in diodes?
     
  15. 4pyros

    4pyros Well-Known Member Most Helpful Member

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    You can try an old alternator. Most have 6 pressed in diodes.
     
    Last edited: May 9, 2014
  16. MrAl

    MrAl Well-Known Member Most Helpful Member

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    Hi,

    I didnt want to laugh at the blond jokes because i didnt want to offend anyone, and besides the more politically correct term these days is "Hair color challenged" <ha ha ha>

    So you moved the center coil to one arm, then what did you put on the other arm the same kind of coil with same turns ?
     
  17. BroncoDave

    BroncoDave Member

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    First, the only way to offend a blonde is to NOT laugh at a joke about them. And yes, same kind from another microwave.
     
  18. BroncoDave

    BroncoDave Member

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    I would, but it's a barrowed charger that wasn't working when I barrowed it. The owner wants to fix it with the correct parts. I am just trying to locate them for him.
     
  19. BroncoDave

    BroncoDave Member

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    My latest test results are in.

    2 - 6v deep cycle RV batteries wired in series+200' of 12 AWG x3 stranded with 2 wires twisted together conected to one side of the coils and the single wire to the other with 12v RV power converter/5 amp max battery charger gives the strongest lifting capacity. I tried it with the batteries in parallel (no RV converter) and it wouldn't lift a paperclip. What I think I need is a 24v alternator and batteries from a big rig. I can mount the alt. to my air compressor between the motor and compressor. Yes it's big enough. 3hp 220vac.
     
  20. BroncoDave

    BroncoDave Member

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    Ok, so I went ahead and put the 35 amp diodes in my friends battery charger in place of the burned out 75 amp diodes. Can anyone guess what happened?
     
  21. MrAl

    MrAl Well-Known Member Most Helpful Member

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    Hi,

    You mean can anyone NOT guess what happened :)
     

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