Re: Phase controller question.

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

Original poster: Ed Phillips <evp-at-pacbell-dot-net> 

"Original poster: robert heidlebaugh <rheidlebaugh-at-desertgate-dot-com>

Ed your first reaction is logical and would be exaxtly what you should
expect.  if filtered dc were applied. A diode supplies pulsating power
and
not DC. The reactance of many AC motors will react as though AC was
applied
when pulsating DC is applied. That is why AC appliences work with
vibrator
and many older type transistor inverters are used. Certainly not all
motors.
Some require only pure sign wave power, that is why they make
,expensive,
sign wave power inverters. You can only know if ,,.   if your motor will
work you try it. No rule applies. Some will NOT work.
     Robert    H"

"Original poster: robert heidlebaugh <rheidlebaugh-at-desertgate-dot-com>

Ed your first reaction is logical and would be exaxtly what you should
expect.  if filtered dc were applied. A diode supplies pulsating power
and
not DC. The reactance of many AC motors will react as though AC was
applied
when pulsating DC is applied. That is why AC appliences work with
vibrator
and many older type transistor inverters are used. Certainly not all
motors.
Some require only pure sign wave power, that is why they make
,expensive,
sign wave power inverters. You can only know if ,,.   if your motor will
work you try it. No rule applies. Some will NOT work.
     Robert    H"

Robert et al:

	Not exactly correct.  The half-wave rectifier output indeed has a
"pulsating" AC component, but it also has a DC component which can (and
usually will) saturate ferromagnetic core material and cause high
magnetizing current to flow during part of the cycle.  Try hooking a
rectifier diode in series with a FUSE!!! in series with a Variac and see
what happens!

Ed