RE: An intersting idea for ballast.

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

Original poster: "terry oxandale by way of Terry Fritz <twftesla-at-qwest-dot-net>" <toxandale-at-cei-dot-net>

Would not the motor turn on its own at the RLA without a second motor to
turn it. Then with the pig in series, the voltage drop across the motor
would drop significantly, (guessing to about 1/2 voltage) doing what (?) to
the balasting effect. Then to lock the rotor for any significant amount of
time would (I think, generate quite of bit of heat in the winding? I'm not
sure but 15kva at LRA would be a lot of energy to dissapate in the form of
"braking". It's a good idea, but would these issues be too overwelming to
allow it to be practical.

(un)Terry

-----Original Message-----
From: Tesla list [mailto:tesla-at-pupman-dot-com]
Sent: Friday, August 31, 2001 11:42 AM
To: tesla-at-pupman-dot-com
Subject: Re: An intersting idea for ballast.


Original poster: "Malcolm Watts by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<m.j.watts-at-massey.ac.nz>

The catch is in slowing the rotor down. That means power losses
somewhere, even if the loss is in the form of frictional heating.
Please correct me if I've misunderstood.

Regards,
malcolm

On 30 Aug 2001, at 19:48, 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?
>
>
>
>
>
> "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.
>
>
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>