Re: An intersting idea for ballast.

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Metlicka Marc by way of Terry Fritz <twftesla-at-qwest-dot-net>" <mystuffs-at-orwell-dot-net>



Tesla list wrote:
> 
> Original poster: "D.Wightman by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<dwightman-at-mmcable-dot-com>
> 
> Some of you may think that I am totaly crazy, But just possibly some of
you may
> think that this is a brilliant idea!
> I am a heat and air technician by trade. And just today this dawned on
me. You
> will find that all A/C motors have something called "LRA". That is locked
rotor
> amps.
> Ok here is the idea, Let's say that you get a 3hp 208-230 vac single phase
> electric motor.The LRA is 75 amps.
> Now you hook up your pig in series with the input wiring to the electric
motor.
> Next you attach a second electric motor to the first motor . This will allow
> you to vary the speed of the rotor in the first motor that is
> wired in series with your piggie, or nst. Ahaa!!!! you now have a variable
> ballast! If you look at the data tag on the electric motor that is being used
> as your variable ballast you will also notice that there is another term
called
> "RLA" that is running load amps. On a 3 h/p motor at 230 vac it will be
around
> 17 to 20 amps.
> But the RLA is around 75 amps. Let's say that the motor is a 1075 rpm. That
> means that if you can turn the rotor at 1075 rpm you will allow only 17 to 20
> amps to your tranny. If you can slow down the rotor the amperage will get
> higher, the slower the rotor turns the higher the amperage flow will be.
If you
> do not allow the rotor to turn at all the amperage through the motor to your
> tranny will be the RLA of the motor. This is just Brilliant!!! Who needs a
> welder? These electric motors are everywhere for real cheap.
> Well what is everyone's thoughts?

If this works in practice, I think it's great!
Maybe a disk brake for locking the rotor and a hefty motor with tach
feedback?
Or better yet a motor WITH electric brake and tach feedback, Adjustable
on the fly just with a turn of a knob, WOOHOOO!
Great thinking, I Might have to start looking for a good motor?
Marc M.


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> "Nature has stored up in the universe infinite energy.
> The eternal recipient and transmitter of this infinite energy is the ether".
>                                        Nikola Tesla. May 20, 1891.