Inverters

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Why are petrol electricity generators called "Inverters" ?

Re: Inverters

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normally just an ac motor-generator set , it is simpler to output ac than dc but
output
quality can be very variable for small cheap units

inverter may be a labelling mistake, some people seem to have learned that
'inverter ' is
'any portable power supply'

or it may be designed to provide a better conditioned output



Re: Inverters

"| || ||| ||||| || |" <|||||||||||||||||||||> wrote in message
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but output
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gah, easy to fall into first-learned mistakes,  engine-generator not
motor-generator

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'inverter '
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Re: Inverters
After serious thinking Paulie wrote :
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The real reason is that some small petrol generators are just an engine
attached to an alternator.
Invertor generators have an engine , an alternator and then a solid
state inverter to produce clean AC for todays fussy electronic devices.
Hence to differentiate the modern ones from rough old generators the
better ones name has been shortened to just inverter.

--
John G.



Re: Inverters

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A large part of the reasoning - apart from a reputed weight saving -
is the ability to provide a decent output frequency stability without
needing uber-tight engine speed governing.

Re: Inverters

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Nearly all of todays 'fussy' electronic devices convert whatever input
they are supplied with to highly regulated DC, then use that.  The
source can be almost anything. Typical input range specs I see now are
100-250 volts, for full regulated output.  And the frequency is almost
irrelevant.  Unlike what we used to do in the ancient days, where valve
equipment ran off a totally unregulated mains transformer, with just a
rectifier and a filter cap.

But I have to agree that 'inverter' for a petrol driven generator is a
bit of a misnomer.

--
Regards,

Adrian Jansen           adrianjansen at internode dot on dot net
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Re: Inverters

"Adrian Jansen"
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** Nothing like true.

A large percentage of items in use today have iron cored transformers -  and
a large percentage of them use toroidal transformers. The latter are
particularly fussy as to the applied voltage and frequency.

And it is not just the ability of the motor to hold a particular rpm
ither  -  both start up and run down can be a real hazard if transformer
loads are still connected.  If 40 Hz or lower is applied for even a couple
of seconds to a toroidal tranny that expects to be fed with 50 Hz, the
supply fuse will blow.


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** No it is not.

 Read the damn thread.


...  Phil





Re: Inverters

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are supplied
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anything. Typical
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the
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days, where
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rectifier
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a
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but then the generator is really a motor powered by the engine, and may be an
alternator
:-)

Haven't taken one apart lately and methods change fast.
They may have found it is cheaper to use an inverter from another product line
and
configure the generator/alternator to feed it DC. Electronics are likely to be
much
cheaper than materials and mechanicals
in the engine or generator.

.



Re: Inverters

"| || ||| ||||| || |" <|||||||||||||||||||||>

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** The design is all new.

The alternators use permanent magnets ( neodymium)  and are three phase.

The petrol motor is operated over its full speed range.

The end up result is way more run time on a given amount of fuel -
especially if lightly loaded.



....  Phil




Re: Inverters

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Not if it is one of those becoming-more-popular type that generate DC
and then drive a solid-state inverter to produce the AC.

Re: Inverters

"Paulie"
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** Only modern and generally top of the line ones are.

There is a petrol motor and alternator as usual, but the alternator is three
phase and rectified to produce high voltage DC.

This allows the petrol motor to run at any rpm that suits the load
conditions  -  so it is way more fuel efficient.

The DC is converted to 50Hz 240V (or 120V) AC by an inverter, using modern
electronics like Mosfets and IGBTs plus of course a uP.

The output frequency and voltage are rock steady and the sine wave quality
very good.



....  Phil










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