Re: No sound-inputs but sound recording FMIT
- Date: Sun, 05 Mar 2017 18:55:55 -0600
- From: John Hasler <jhasler@xxxxxxxxxxx>
- Subject: Re: No sound-inputs but sound recording FMIT
> Induction motors can function as generators. You just need to connect
> them to an appropriate AC source and drive them above synchronous
> 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.
Elmwood, WI USA