Dino G Posted November 3, 2004 Report Share Posted November 3, 2004 I need to find or design a dc generator of sorts that will generate energy when spun in a circle. It will be fixed to a rotating object. I need to have power at the center of the rotating object but cannot have a cord or wire as the piece needs to stay mobile. A switch with a battery is not an option as the continuous replacement of the batteries would be very impractical. Does anyone have any suggestions.Thanks,Dino Quote Link to comment Share on other sites More sharing options...
ante Posted November 3, 2004 Report Share Posted November 3, 2004 Dino,Welcome to this forum.Can you mount a permanent magnet close to the rotating object?What kind of power do you need, Volts, Ampere, Watt? Quote Link to comment Share on other sites More sharing options...
Lou Posted November 3, 2004 Report Share Posted November 3, 2004 HiYou could use a rotating transformer salvaged from the head assembly of an old VCR. You could feed the primary with a 250Kc power square-wave and rectify the secondary output with Schottky diodes. I guess you'd be able to transfer a fair amount of watts in this way. Quote Link to comment Share on other sites More sharing options...
Dino G Posted November 3, 2004 Author Report Share Posted November 3, 2004 Thanks for the welcome. I could mount a permanent magnet close, but it would be off center. How close would it need to be? How many cycles per second are we looking for? I will be looking for a max of 5v, about 300 mA, and bout 1-1.5 W. Quote Link to comment Share on other sites More sharing options...
audioguru Posted November 3, 2004 Report Share Posted November 3, 2004 Hi Dino,That's a lot of power to get out of thin air.Good luck. Quote Link to comment Share on other sites More sharing options...
ante Posted November 3, 2004 Report Share Posted November 3, 2004 Dino,I was thinking something like what I have seen on bicycles where they put two coils on the inside of the front wheel fork near the rim. Then there are small magnets on the rim with even intervals. This supplies the front and rear lights with power. It should be possible to produce power with the coils in the rotating part and have some magnets fixed close to the path of the coils. Since I don Quote Link to comment Share on other sites More sharing options...
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