metacogitans Posted January 31, 2016 Share Posted January 31, 2016 If I have a source of mechanical energy (say, a windmill) to rotate a coil in a generator, could I use copper coil electromagnets hooked up to the same battery the commutator is connected to instead of permanent magnets? Link to comment Share on other sites More sharing options...
John Cuthber Posted January 31, 2016 Share Posted January 31, 2016 You can have a generator without permanent magnets. https://en.wikipedia.org/wiki/Excitation_(magnetic) Link to comment Share on other sites More sharing options...
metacogitans Posted January 31, 2016 Author Share Posted January 31, 2016 (edited) Thanks, "self-excitation" was the term I was looking for. I wasted way too much time trying to find that on google. The electromagnets can be hooked up to the same battery that's being charged, right? Edited January 31, 2016 by metacogitans Link to comment Share on other sites More sharing options...
studiot Posted January 31, 2016 Share Posted January 31, 2016 If I have a source of mechanical energy (say, a windmill) to rotate a coil in a generator, could I use copper coil electromagnets hooked up to the same battery the commutator is connected to instead of permanent magnets? No. In fact if you had asked the question does an electric generator need magnets at all the answer would still be no. A simple example is piezoelectric generators. There was even a proposal and some experiments to recover energy from vehicles braking by the use of 'hit plates', using this method. Link to comment Share on other sites More sharing options...
fiveworlds Posted January 31, 2016 Share Posted January 31, 2016 If I have a source of mechanical energy (say, a windmill) to rotate a coil in a generator, could I use copper coil electromagnets hooked up to the same battery the commutator is connected to instead of permanent magnets? Why would this be necessary though? We can make permanent magnets now there was a time we were worried about running out but not anymore. Link to comment Share on other sites More sharing options...
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