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Posted by Daniel who wants to know on January 30, 2011, 3:19 am
 

Oh I've already BTDT many times Jimmy boy.

A PWM motor speed controller is a DC-DC buck converter that uses the motor
windings themselves as the inductor, but it ALWAYS slows the motor down when
set lower than 100%.  You could drive a DC motor faster with the output of a
DC-DC boost converter but that increases battery amps.

Some VFD AC motor drives uses varying PWM to produce a sine wave, just like
a pure sine power inverter or a class D amplifier, but not all VFDs are PWM
based, some are cycloconverter based.



Posted by daestrom on January 30, 2011, 2:22 pm
 
On 1/29/2011 22:19 PM, Daniel who wants to know wrote:

But Jim also mentioned that he's running 18V power tools from a 24V
source through the PWM.

Clearly, 24V will spin a DC motor faster than 18V.  So there's no
'magic' here, just Jim is using a different battery pack through the
tools existing PWM controls.

daestrom


Posted by m II on January 30, 2011, 6:42 pm
 On 11-01-28 08:51 PM, Curbie wrote:

Don't laugh...I have a magic floor. Anything that falls on it becomes
almost impossible to find.





mike

Posted by Jim Rojas on January 30, 2011, 7:02 pm
 m II wrote:

Curbie will post a chart on how that's not scientifically possible. He
will also argue that anything that falls on the floor goes into a micro
black hole. You just don't understand the principle behind it. These
black holes are all around us... :)

Jim Rojas

Posted by Curbie on January 30, 2011, 8:17 pm
 wrote:


Well that's just as factual as you saying you can create energy from
nothing or 350 gallons will fill a 2000 gallon pool deficit.
  
More fairy-tails, from someone that truth or reality does not apply
to.
    
Curbie


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