ironizer Posted September 9, 2009 Share Posted September 9, 2009 Nothing I do ever works. I made my solenoid type thing with about 300 turns, and Im using strong neodymium magnets... I get 0.02 volts when I pull the magnet out very fast... it is not enough. I want to make a series of these solenoids so when I move the magnet across I want to "feel" a drag, and I want to actually produce some electricity (it will be AC but it's okay). If I move the magnet at 20-30m/s I want to get at least a few volts. So what's the trick to making one of these generators? Am I building it wrong? What sort of resistors can I hook up so that I feel it hard in my hand to swipe the magnet across the top or the solenoids? Link to comment Share on other sites More sharing options...
NeonBlack Posted September 9, 2009 Share Posted September 9, 2009 Since this would produce a very sharp spike, I am guessing that your voltmeter just isn't fast enough to capture it and is averaging it out over a larger time resolution. 1 Link to comment Share on other sites More sharing options...
ironizer Posted September 10, 2009 Author Share Posted September 10, 2009 How can I calculate the maximum potential generated? I don't know how to calculate the field, all I have is the magnet but how do I measure its field in Tesla or Gauss? Link to comment Share on other sites More sharing options...
gonelli Posted September 10, 2009 Share Posted September 10, 2009 If I move the magnet at 20-30m/s I want to get at least a few volts. Do you realise that 20 to 30m/s is 72 to 108km/h? I would think that is a little fast to do by hand. How can I calculate the maximum potential generated? I don't know how to calculate the field, all I have is the magnet but how do I measure its field in Tesla or Gauss? Well, you can use EMF(peak) = NBAw to work out the peak voltage produced. Where, N = number of turn of wire (coils) B = magnetic field strength in Tesla A = total internal area of the coils w (which is meant to be a small omega) = angular momentum [ = 2(pi)*frequency] But as you said you don't know the field strength...so, you could use F = BIl to work out an approximate B (field strength), from known force, current and length of wire. This might explain what to do. Link to comment Share on other sites More sharing options...
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