Because I've got these motors laying around and wanted to learn a
thing or two.
         I don't want 60Hz AC out.  Just something >12v so I can rectify
and charge a battery.  Everyone says that's not possible, but no one has
explained yet why I can light up LEDs just by connecting them to the leads
and spinning the shaft = energy out.  Any takers on an explanation?

Thanks,

Gary



At 07:41 AM 11/24/2002 -0600, you wrote:
>Why don't you just use a car alternator?  All the engineering is done,
>diodes installed and all that.  You can get them cheap from auto salvage
>yards etc.  my friend has hooked them up to a water wheel by a stream
>and powers his remote cabin in the kentucky hills with 12v. he has a
>bank of batteries and even an inverter when he needs AC.
>
>I bought a 100 amp alternator at a swap meet for $15
>
>Bob
>
>William Chops Westfield wrote:
>
>>    > 2. If I end up using it in a windmill, I'd like to run it at low
>>    > speeds (couple hundred rpm) and charge a 12V battery.  Is there an
>>    > easy way to get higher V/rpm?
>>
>>    Not without rewinding it.
>>
>>Hmm.  There's a fair amount of "mechanical magic" to the construction of
>>a modern motor.  If you have something like an induction motor (no
>>magnets, lots of coils), how efficient a generator can you get if you
>>rip apart the rotating part and attach some strong magnets to it?  Then
>>you possibly rewire the outer windings, and...
>>
>>I guess a related problem is how to rewire a brushless DC motor (ie a
>>fan) to be a generator.  It's GOT the appropriate magnets and coils,
>>they're just not wired the way they need to be to get electicity OUT...
>>
>>BillW
>>
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Gary Neal
Research Assistant - Drivetrain Technology Center
Applied Research Laboratory - Penn State University
PO Box 30
Research Building West
North Atherton Street
State College, PA 16801
814-863-5468 (phone)
814-863-6185 (fax)

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