Re: prony brake

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: Ed Phillips <evp@xxxxxxxxxxx>

Original poster: "Dmitry (father dest)" <dest@xxxxxxxxxxx>

Hallo Sean,

Thursday, March 09, 2006, 1:06:15 AM, you wrote:

i don`t quite understand, how can ordinary induction motor present any
load without external currents in its winding(s)? are you trying to say,
that it acts like a generator even having no permanent magnets? ^_^

> Original poster: "Sean Taylor" <sstaylor@xxxxxxxxx>

> Another idea for an induction motor . . . If you're spinning fast
> enough (above synchronous speed), you can place a large capactor
> across the terminals and connect various loads.  You just have to be
> careful to keep the speed up or the load will drop considerably."

   Do a web search on "asynchronous generator" and you' ll learn a 
lot.  The keys are a capacitive load ("leading power factor") and 
residual magnetism in the core.  Not an uncommon application but 
rarely discussed.

Ed