electromagnet stuff

dear benj,


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jp wrote:

Since you mentioned 12 volts before, if you wind that coil with 20 gauge film insulated magnet wire( about 1000 feet; coil will be approximately 26 layers at 88 turns per layer), you'll have about 12 watts into the coil (will draw about 1 amp and if you care, the inductance will be about 84 milliHenry) and get about 400 gauss at the center of the coil with no iron in it. Iron will increase the field. This should be in a safe continuous duty temperature range. To push things you can drop the wire to 18 gauge which increases the center field to about 800 gauss, but will put 45 watts into the coil. That baby will likely get HOT! If this is too weak then you've got to go with winding the coil with tiny copper tubing use low voltage and heavy current and run water through it to take the heat away. Any way to remove heat will help such as fans or heat sinks. But the problem is the heat is going into the center of the coil where air currents or heat sinks can't carry it away. Why not use another permanent magnet as a "pusher"? They'll be plenty strong.
Good luck!
Benj
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