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Patexia Research
Patent No. US 11215117
Issue Date Jan 4, 2022
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Patent 11215117 - Gas turbine engine having electric motor applying power to the high pressure spool shaft and method for operating same > Claims

  • 1. A gas turbine engine comprising: a low-pressure spool comprising a low-pressure compressor in rotational communication with a low-pressure turbine and a fan via a first shaft;a high-pressure spool comprising a high-pressure compressor in rotational communication with a high-pressure turbine via a second shaft; andan electric motor operably connected to the second shaft, the electric motor configured to apply a rotational force to the second shaft;wherein the low-pressure compressor is a fixed-vane compressor.
    • 2. The gas turbine engine of claim 1, further comprising an engine accessory gearbox operably connecting the electric motor to the second shaft.
    • 3. The gas turbine engine of claim 1, further comprising an energy storage device in electrical communication with the electric motor.
      • 4. The gas turbine engine of claim 3, wherein the energy storage device is a battery.
      • 5. The gas turbine engine of claim 3, further comprising a controller configured to selectively apply electrical energy from the energy storage device to the electric motor causing the electric motor to apply the rotational force to the second shaft.
    • 6. The gas turbine engine of claim 1, wherein the low-pressure spool further comprises an electrical generator operably connected to the first shaft, the electrical generator in electrical communication with the electric motor.
      • 7. The gas turbine engine of claim 6, further comprising a controller configured to selectively apply electrical energy from the electrical generator to the electric motor causing the electric motor to apply the rotational force to the second shaft.
    • 8. The gas turbine engine of claim 1, wherein the low-pressure spool further comprises a fan drive gear system connecting the fan to the first shaft to drive the fan at a lower speed than the low-pressure spool.
  • 9. A method for operating a gas turbine engine, the method comprising: providing a low-pressure spool comprising a low-pressure compressor in rotational communication with a low-pressure turbine and a fan via a first shaft;providing a high-pressure spool comprising a high-pressure compressor in rotational communication with a high-pressure turbine via a second shaft; andapplying a rotational force to the second shaft with an electric motor operably connected to the second shaft;wherein the low-pressure compressor is a fixed-vane compressor.
    • 10. The method of claim 9, further comprising calculating, with a controller, a current operating state of the low-pressure compressor.
      • 11. The method of claim 10, further comprising determining, with the controller, a maximum operating line of the low-pressure compressor.
        • 12. The method of claim 11, further comprising selectively applying the rotational force to the second shaft, with the electric motor, to maintain the current operating state of the low-pressure compressor less than or equal to the maximum operating line of the low-pressure compressor.
          • 13. The method of claim 12, further comprising controlling, with the controller, a speed of the electric motor to maintain the current operating state of the low-pressure compressor less than or equal to the maximum operating line of the low-pressure compressor.
            • 14. The method of claim 13, further comprising: generating electrical energy with an electrical generator operably connected to the first shaft; andapplying the electrical energy to the electric motor.
            • 15. The method of claim 13, wherein determining, with the controller, the current operating state of the low-pressure compressor includes determining, with the controller, a pressure ratio of the low-pressure compressor and an air flow of the low-pressure compressor using one or more sensors in communication with the controller.
          • 16. The method of claim 12, further comprising applying electrical energy to the electric motor with an energy storage device.
            • 17. The method of claim 16, wherein the energy storage device is a battery.
  • 18. A gas turbine engine comprising: a low-pressure spool comprising a fixed-vane low-pressure compressor in rotational communication with a low-pressure turbine and a fan via a first shaft, the low-pressure spool further comprising a fan drive gear system connecting the fan to the first shaft to drive the fan at a lower speed than the low-pressure spool;a high-pressure spool comprising a high-pressure compressor in rotational communication with a high-pressure turbine via a second shaft;an electric motor operably connected to the second shaft, the electric motor configured to apply a rotational force to the second shaft;an energy storage device in electrical communication with the electric motor; anda controller configured to selectively apply electrical energy from the energy storage device to the electric motor causing the electric motor to apply the rotational force to the second shaft.
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