Hybridisation of the compressors of a turbojet

A twin-spool bypass turbojet engine comprising a fan positioned upstream from a gas generator and delimiting a primary flow and a secondary flow, the gas generator having the primary flow pass through the gas generator and comprising a low-pressure compressor, a high-pressure compressor, a combustion chamber, a high-pressure turbine and a low-pressure turbine,

• the low-pressure turbine being connected to the low-pressure compressor by a low-pressure shaft and the high-pressure turbine being connected to the high-pressure compressor by a high-pressure shaft,
• wherein the turbojet engine further comprises an electric motor configured to supply an applied mechanical power to at least one of the low-pressure and high-pressure shafts through a power application device, and an electric generator configured to draw an extracted mechanical power from at least one of the low-pressure and high-pressure shafts through a power take-off device,
• wherein the power take-off device is sized to extract an excess mechanical power of the extracted mechanical power for actuating at least one auxiliary system of the turbojet engine, the electric generator transforming the excess mechanical power into an electrical energy,
• wherein the electrical energy is transformed into the applied mechanical power by the electric motor for actuating at least one of the low-pressure and high-pressure shafts,
• wherein an electricity storage device is operably connected to the power take-off device and the electric motor, the electric storage device being configured to store the electrical energy,
• wherein the excess mechanical power being drawn by the power take-off device from the low-pressure shaft and the applied mechanical power being supplied to the high-pressure shaft by the power application device during an operation of the turbojet engine,
• wherein a first portion of the low-pressure shaft is selectively coupled to a fan driveshaft which is a second portion of the low-pressure shaft to provide a coupled state and an uncoupled state, the power take-off device being configured to draw a fan mechanical power from the fan driveshaft when the first portion of the low-pressure shaft and the fan driveshaft are in the uncoupled state, and
• wherein the fan mechanical power is applied to the high-pressure shaft when the first portion of the low-pressure shaft and the fan driveshaft are in the uncoupled state.