I know i need magnet and copper wire, but how much? what kind? this must be small so the motor can spin it. the plan is to have it power a bulb. it is being powered by a aprox. 1 inch long electric motor.
Go to a hobbies store and ask them.
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How can i make a very small, simple, homemade generator powered by a small electric motor.?
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August 2nd, 2010 at 11:54 am
If the motor is a permanent magnet motor, you can take another one and use it as a generator.
It takes a lot of skill and a good machine shop and a good winding shop to make either a motor or a generator. And a lot of experience.
but why would you run a generator from a motor?
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August 2nd, 2010 at 12:05 pm
I am assuming this is a problem in constructing a generator. There can be both alternating and direct current generators. A simple direct current electric motor is also a generator, and the reverse, a DC generator will run like a DC motor. An alternating current electric generator is the simplest as it just requires slip rings rather than a commutator. So if you turn a coil of wire in a permanent magnet field, you will generate alternating current. If all you want to do is light the bulb, it will depend upon finding the right dimensions of the motor and generator. Like if the power source, the motor is an AC motor, it will run at a set speed. In the US, it will be some multiple of 60 cycles. Most household AC motors run at 1800 RPM, listed as 1750 or so to allow for lag due to the load. But they have a lot of windings and you won’t need so many windings. Alternately you can spin a permanent magnet inside a set of windings to generate a current. This does not require slip rings as when the magnet turns it generates alternating currents. By the way, alternators in automobiles operate this way. First you need to figure out how to mount a magnet on a turning shaft. Or you need to figure out how to mount coils on a shaft with slip rings. For the former you then put coils of wire near the magnet and measure the output voltage or see if the bulb lights up. For the latter you will need to find some way to make slip rings, see a picture of an AC generator that uses slip rings. Doing a DC setup is harder as there is a commutator to build. You can find a small toy motor and use it as a generator but then it is not something you have built. Toy motors are relatively cheap if you are in the US but they are not that difficult to build and use as generators either. Take one apart and you will see how they work.
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August 2nd, 2010 at 12:29 pm
Go to a hobbies store and ask them.
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References :