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Air conditioner with inverter technology

Discussion in 'Electrical Engineering' started by abu, May 5, 2008.

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  1. abu

    abu Guest

    Hi all,
    I have just learned here
    about the inverter technology in air conditioners

    Is it really true that, when starting their engines, these types of
    conditioners will not generate dips in the voltage of components
    attached in parallel to the air conditioner, contrarily to what normal
    air conditioners do? Will the current draw of these units always stay
    within the specs written on their nameplates, even during the transients?

    The reason I ask is written more precisely in this thread
    which is now old so please excuse if I start a new one specifically on
    the inverter technology

    Thanks for your help
  2. James Sweet

    James Sweet Guest

    It doesn't shift from inverter to direct drive, there's no reason for
    it. A VFD rectifies and filters the incoming AC to feed DC rails which
    are then used to power the output stage which gives you 3 phase AC at
    anywhere from a few Hz up to 80Hz or so. Most of the units I've seen do
    a soft start, but I've only dealt with them on machine tools, not AC
  3. The induction motors in aircon/fridge/freezer compressors don't
    have much starting torque, although the locked rotor current can
    be high. They usually don't have enough starting torque to
    overcome any existing pressure differential across the compressor,
    so they typically either have a timer to ensure they can't restart
    too soon before the pressure differential has decayed away, and/or
    they have an auto reset current thermal trip to detect more than a
    few seconds of locked rotor current, and backoff for a timeout
    before retrying.
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