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Discussion in 'Hobby Electronics' started by Paulie, Sep 22, 2011.

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  1. Paulie

    Paulie Guest

    Why are petrol electricity generators called "Inverters" ?
  2. 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
  3. gah, easy to fall into first-learned mistakes, engine-generator not motor-generator
  4. Phil Allison

    Phil Allison Guest

    ** 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
  5. 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.
  6. Phil Allison

    Phil Allison Guest

    "Adrian Jansen"
    ** 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.

    ** No it is not.

    Read the damn thread.

    .... Phil
  7. 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.

  8. Phil Allison

    Phil Allison Guest

    ** 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
  9. atec77

    atec77 Guest

    Another woddles impersonator
    he's dumb as a post
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