Re: No sound-inputs but sound recording FMIT

From	John Hasler <jhasler@newsguy.com>
Newsgroups	linux.debian.user
Subject	Re: No sound-inputs but sound recording FMIT
Date	2017-03-06 02:00 +0100
Message-ID	<thPah-8u4-3@gated-at.bofh.it> (permalink)
References	<tgVUu-20d-23@gated-at.bofh.it> <thMvM-6KC-15@gated-at.bofh.it> <thMFr-6PE-9@gated-at.bofh.it> <thOxA-8cZ-5@gated-at.bofh.it>
Organization	Dancing Horse Hill

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I wrote:
> Induction motors can function as generators.  You just need to connect
> them to an appropriate AC source and drive them above synchronous
> speed.

Gene writes:
> 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.

That's not what I mean.  Hook an induction motor to utility power and
drive it above synchonous speed.  It will power *to* the network.

When you put DC current through the field of an induction motor to brake
it you are also using it as a generator.  It's just that all the power
gets dissipated in the armature.
-- 
John Hasler 
jhasler@newsguy.com
Elmwood, WI USA

Thread

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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