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inverter generators

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Posted by amdx on June 22, 2010, 11:57 am
 


 Hi All,
 I want a definition of  "inverter generator"

 Is it as simple as the generator generates a DC voltage and then
an electronic circuit (inverter) uses the dc to make 60 hz AC?

Or maybe the generator generates AC which is changed to DC and
then back to (cleaner, inverter) AC.

                             Mike



Posted by Jim Wilkins on June 22, 2010, 12:49 pm
 



This is the manual for the Yamaha EF1000:
http://www.yamaha-motor.com/assets/service/manuals/0/LIT-19626-01-19_1109.p=
df

The schematic at the end shows two three-phase permanent magnet
alternators (1,2) which presumably are rectified to DC and then
inverted to 60Hz AC. I haven't worked on one of these generators but
motorcycles use those alternators.

I would guess that one of the alternators must put out enough voltage
at idle, the other is more efficient at high speed. The stepping motor
(21) might control the throttle. The bottom part of the schematic is
the engine ignition.

jsw

Posted by amdx on June 22, 2010, 4:16 pm
 



This is the manual for the Yamaha EF1000:
http://www.yamaha-motor.com/assets/service/manuals/0/LIT-19626-01-19_1109.pdf

The schematic at the end shows two three-phase permanent magnet
alternators (1,2) which presumably are rectified to DC and then
inverted to 60Hz AC. I haven't worked on one of these generators but
motorcycles use those alternators.

I would guess that one of the alternators must put out enough voltage
at idle, the other is more efficient at high speed. The stepping motor
(21) might control the throttle. The bottom part of the schematic is
the engine ignition.

jsw
  Thanks for the schematic, although I didn't get an answer. Item #5 the
control unit could have rectifiers and an inverter on it, but I suspect it
just
as it is labeled, control unit- it controls the engine speed depending on
load.
                                                   Thanks, Mike



Posted by hamilton on June 22, 2010, 5:11 pm
 

This may help:

http://en.allexperts.com/q/Electronics-3923/2009/1/Inverter-vs-non-inverter.htm

h

Posted by Joel Koltner on June 22, 2010, 5:49 pm
 


I tend to agree with the final result of the answer -- even for running "fancy
electronics," a regular generator is generally just fine -- but I really have
to wonder how much of an "expert" he is when he says things like:

"The best power comes from a plain and simple generator.  This is where
commercial power comes from, a rotating magnetic field in a coil that
generates a nice pure sine wave.  Not sure why you seem to imply that
electronics need something else - this is what they get out of a wall socket,
what they are all designed for.  I don't know why you need gfci or surge
protectors, a home generator is pretty safe from transients that can come off
the power lines from faults, lightning bolts, etc."

Sheesh!  How about:

-- The stuff coming out of the wall is much more stable both in voltage and
frequency than that coming out of a generator
-- GFCIs are meant to protect people, not generators or connected electronic
devices

Also, he should replace "hard" in this sentence:

"Most cheap inverters suck, because it's really hard to synthesize a good sine
wave, so they cheat and make squarish waves."

...with just "more expensive."

And I'd like him to find me the transformer in a ceiling fan ... or find a PC
that doesn't use a "power transformer" in its power supply:

"If you have equipment that can deal with these pseudo-sine waves, that's the
way to go as they are very efficient.  Most electronics have no problem with
this, as they take the line and make it into DC right away anyway.  Like a
compact fluorescent bulb, or a PC.  But some appliances have a problem with
this, in particular anything with a power transformer in it, like an older
microwave oven or stereo amp or fluorescent tube fixture or ceiling fan."

I suppose I'm just being picky though.  These days "experts" seems to mean
"isn't *completely* ignorant on the subject," and its clear he does know at
least a little more than the average bear on the subject.

---Joel


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