Re: Phase shifter problems

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: Yurtle Turtle <yurtle_t@xxxxxxxxx>

What size is the motor? My 3,600 rpm 120 volt 1/2 hp
motor takes around 220 uF (iirc) to get the
appropriate voltage rise. Try looking around for old
air conditioners or refrigerators to get lots of 440
vac caps in a variety of sizes. Check with big
appliance repair shops, salvage yards, etc. Helps to
"dial in" the right value. I have from as small as 2
to as big as 45 uF.

Adam

--- Tesla list <tesla@xxxxxxxxxx> wrote:

> Original poster: "Christoph Bohr"
> <cb@xxxxxxxxxxxxxxx>
>
> Hello folks.
>
> I know this has been widely discussed, not reason
> for me
> not to come up with another problem ;-)
> Yesterday I had my first try on a phase-shifter.
>
> I lashed everything up on the workbench, 10A
> 230V Variac in series with one line and a 7, 14 and
> 68µF
> cap in parallel with a former 370Watt Motor which
> now runs
> at 220W syncronous.
>
> With minimun inductance the RSG starts up normally,
> at
> 25% variac setting the motor looses sync, though the
> voltage is
> still high enough that it should keep in sync.
> At least it sounds like it looses sync, I havent
> tried this yet.
> At 50% it rapidly starts loosing rpm and finally
> stops altogether.
> I can not observe any resonant rise, the effect is
> the same with
> all of the three capacitors I mentioned above.
>
> Unfortunately I can not give any number regarding
> the L of the Variac...
>
> Can anyone give advice how I should proceed?
>
> best regards
>
> Christoph Bohr
>
>
>