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Re: prony brake



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