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Is This True? Recharging Magneto Magnets at Home

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Scott

09-05-2002 02:30:37




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I was told by a fellow tractor nut that he was told by another guy that you can recharge the magnets in your magneto by wrapping many strands of copper wire around your magnets and then attaching a 12volt batter to the copper wire you can create a magnetic field that will recharge your magnets. I am asking this here because I find that hard to believe. Now if this is true can someone explain to me how this all works, or maybe also give better details how this should work without causing a problem with the magnets.

Thanks.

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Butch(OH)

09-06-2002 04:37:38




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 Re: Is This True? Recharging Magneto Magnets at Home in reply to Scott, 09-05-2002 02:30:37  
Technically your buddy is right, it could be done but just like on the McGiver show, itís a little more complicated than wrapping wire around it till it looks right and hooking it up. If you have one that needs charged there are a bunch of people that do it, and for cheap to boot.



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Bryan Smith

09-05-2002 12:56:04




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 Re: Is This True? Recharging Magneto Magnets at Home in reply to Scott, 09-05-2002 02:30:37  
Any wire conducting electric current has a magnetic field surrounding it. The field stays there as long as the current flows, then collapses when the current ceases in a direct current (D.C.) system. (Note that alternating current (A.C.) systems - like in your home - reverse polarity 120 times per second - 60 positive and 60 negative - so the magnetic field expands and collapses each time the polarity shift happens. You can't use A.C. to magnetize something.)

The idea behind this is the same that you use to electrify a nail or screwdriver - coil some wire around it and apply D.C. current for a period of time. The coil of wire multiplies the amount of magnetic field - more turns means more magnetic field. The magnetic field induced by the current in the coil will magnetize the nail or screwdriver.

Here's the hard part - how do you tell which end to hook to the + and which end to hook to the - of the battery? Which way the current flows determines polarity of the coil of wire. I guess you could use a compass on the coil of wire before you slip it on the magnet and on the magnet to figure this out. **CAUTION** - if you hook that wire up just to the two ends of the wire without a load, the battery will be shorted and may explode. Better have a light in the circuit to prevent this.

No idea if it will work. You *can* magnetize screwdrivers as I've noted, but it's not a real strong magnetic field. Be careful if you try it - just don't short that battery with a wire and no load on it!

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Diesel Don

09-05-2002 18:35:46




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 Re: Re: Is This True? Recharging Magneto Magnets at Home in reply to Bryan Smith, 09-05-2002 12:56:04  
The left hand and right hand rules would determine the polarity of the magnet without applying power.Unfortunately I don't remember how to apply them.I'll try the internet later and report back.I would imagine a very strong field would be required to charge a magneto magnet.



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Diesel Don

09-05-2002 19:48:29




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 Re: Re: Re: Is This True? Recharging Magneto Magnets at Home in reply to Diesel Don, 09-05-2002 18:35:46  
I FOUND IT!!!!! !! I can celibrate,I haven't had to deal with this stuff since tech school.It is the left hand rule by Maxwell.To find the polarity of an electromagnet,take your left hand and rap your fingers around the coil in the direction it is wound.Your fingers should also match the current flow from NEG TO POS.Your thumb will point to the north pole of the coil.



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