Electrical naval azimuth propulsion system comprising magnetic shielding means to shield the magnetic field generated by the electric motor

A naval azimuth propulsion system comprising:

• an electric motor,
• a propeller operatively connected to the electric motor to rotate about a central axis of the motor,
• an annular nozzle positioned coaxially around the propeller,
• a supporting mount for supporting the motor and the propeller, the supporting mount including a fixed portion suitable for mounting to a hull of a ship and a shaft rotatably mounted with respect to the fixed portion for rotatably mounting the electric motor to the fixed portion,
• a first magnetic shield including a shell suitable for shielding a magnetic field generated by the electric motor during operation,
• a second magnetic shield suitable for compensating variations of a terrestrial magnetic field generated by movement of the first magnetic shield relative to the terrestrial magnetic field,
• the second magnetic shield comprising a plurality of electrical conductor turns wound on the annular nozzle, the electrical conductor turns generating a respective magnetic field when electric current flows through the electrical conductor turns,
• the second magnetic shield comprising a check and control system including a computer configured to regulate the electric current flowing through the electrical conductor turns independently of a current flowing through the electric motor and thereby regulate the respective magnetic field to compensate for the variations of the terrestrial magnetic field independently of the current flowing through the electric motor.