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Waste heat recovery device

  • US 9,109,503 B2
  • Filed: 04/25/2011
  • Issued: 08/18/2015
  • Est. Priority Date: 07/08/2010
  • Status: Active Grant
First Claim
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1. A waste heat recovery device including a gas compressor which compresses a gas, and a turbine driven by an exhaust gas, comprising:

  • an alternating current generator operably connected to the turbine;

    an electric motor operably connected to drive the compressor; and

    a control device operably connected to the electric motor,wherein the control device comprises;

    a rectifier operably connected to the output of the alternating current generator,a DC smoothing circuit operably connected to the output of the rectifier,an inverter arranged to drive the electric motor,a direct current bus operatively connected to transfer electric power from the alternating current generator to the electric motor,a rotation speed detector operably connected to the turbine and the alternating current generator, wherein the rotation speed detector is arranged to detect rotation speed of the turbine and the alternating current generator,a voltage detector, the voltage detector operatively arranged to detect a voltage of the current bus,a rotation speed command unit operably connected to the rotation speed detector and the inverter, the rotation speed command unit arranged to output a rotation speed command value to the inverter in response to the rotation speed of the alternating current generator, the inverter being arranged to drive the electric motor at a variable speed in accordance with the rotation speed command value from the rotation speed command unit.

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