Re: (ET) Another idea for an AC source?

[Christopher Zach <czach computer org>]

The key is capacitors and residual magnetism in the stator core. When 
you spin it up it will generate a very small charge, which can then 
charge up a bank of say 200mfd of motor run capacitors in parallel with 
the output. The caps then keep the field going.

If there is no residual magnetism you can "flash" it with a 1-2 second 
shot from a DC source (say an Elec-trak battery :-) Then it will be 
magnetized and will fire up. The way to lose the magnetism is to power 
it down with a load connected; to keep it you disconnect the load before 
powering down.

An excellent article is here:

http://www.qsl.net/ns8o/Induction_Generator.html

Chris

Ralph G Vogan wrote:
> How can an induction A.C. motor act as a generator?  They have no 
> armature winding and any residue magnetism in the field will not create 
> a current in the non-rotating field. 
>
> A a.c.-d.c. motor is a series motor.  It will output a uncontrolled d.c. 
> voltage if used as a generator, If it outputs anything at all. 
>
> a three phase a.c. motor is also an induction motor.  If you put a.c. 
> into one winding you will get a.c. out of the other windings if it is 
> rotating, but it is just acting like a transformer not a generator.
>
> Ralph V
> ralphgv centurytel net <mailto:ralphgv centurytel net>
> ET Web page
> http://ralphgv.tripod.com/
>
>
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