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Re: No sound-inputs but sound recording FMIT

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On Sun, Mar 05, 2017 at 07:13:22PM -0500, Gene Heskett wrote:
> On Sunday 05 March 2017 17:16:36 John Hasler wrote:
> 
> > Gene Heskett writes:
> > > Very simple. With the glaring exception of the modern AC induction
> > > motor that in 99% of the stuff we buy, ANY other generator can also
> > > be used as a motor...
> >
> > Induction motors can function as generators.  You just need to connect
> > them to an appropriate AC source and drive them above synchronous
> > speed.
> >
> Yes, there is that exception, they need an excitation current, true, but 
> in that case they make excellent brakes as they don't like spinning 
> above synchronous any better than they like running below it.  And with 
> enough dc current you can come pretty close to stopping them dead in 
> their tracks. Certainly within one revolution.  But the armature is 
> soft, and its not possible to maintain the magnetic field from its 
> shorted turns armature long enough to extract any output power from it 
> for more than a few milliseconds.

In other words Back EMF?

I know a chap who found about that the hard way when he tried to get
something from nothing by charging a battery from a generator which he
turned by having a fan connected to it. :)

He didn't get electrocuted or anything, the fan abruptly stops turning.

-- 
The media's the most powerful entity on earth. 
They have the power to make the innocent guilty 
and to make the guilty innocent, and that's power.
 -- Malcolm X

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No sound-inputs but sound recording FMIT GiaThnYgeia <GiaThnYgeia@openmailbox.org> - 2017-03-03 15:00 +0100
  Re: No sound-inputs but sound recording FMIT deloptes <deloptes@gmail.com> - 2017-03-03 20:40 +0100
    Re: No sound-inputs but sound recording FMIT GiaThnYgeia <GiaThnYgeia@openmailbox.org> - 2017-03-04 14:10 +0100
      Re: No sound-inputs but sound recording FMIT deloptes <deloptes@gmail.com> - 2017-03-04 21:00 +0100
        Re: No sound-inputs but sound recording FMIT Curt <curty@free.fr> - 2017-03-05 12:20 +0100
          Re: No sound-inputs but sound recording FMIT Curt <curty@free.fr> - 2017-03-05 13:40 +0100
            Re: No sound-inputs but sound recording FMIT GiaThnYgeia <GiaThnYgeia@openmailbox.org> - 2017-03-05 21:20 +0100
              Re: No sound-inputs but sound recording FMIT Gene Heskett <gheskett@shentel.net> - 2017-03-05 21:30 +0100
                Re: No sound-inputs but sound recording FMIT GiaThnYgeia <GiaThnYgeia@openmailbox.org> - 2017-03-05 23:10 +0100
                Re: No sound-inputs but sound recording FMIT John Hasler <jhasler@newsguy.com> - 2017-03-05 23:20 +0100
                Re: No sound-inputs but sound recording FMIT Gene Heskett <gheskett@shentel.net> - 2017-03-06 01:20 +0100
                Re: No sound-inputs but sound recording FMIT John Hasler <jhasler@newsguy.com> - 2017-03-06 02:00 +0100
                Re: No sound-inputs but sound recording FMIT cbannister@slingshot.co.nz - 2017-03-27 13:30 +0200
                Re: No sound-inputs but sound recording FMIT kAt <giathnygeia@openmailbox.org> - 2017-03-27 17:50 +0200
                Re: No sound-inputs but sound recording FMIT Gene Heskett <gheskett@shentel.net> - 2017-03-06 01:10 +0100
  Re: No sound-inputs but sound recording FMIT Ric Moore <wayward4now@gmail.com> - 2017-03-03 21:00 +0100

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