Siemens has developed a new type of ship motor that uses superconductor technology. Superconducting materials are used for the rotor windings, which are housed in a closed system cooled down to -246°C. These windings can bear 100 times more current density than copper windings. The propeller unit, which has an output of 4 MW, will be used to power all-electric ships (AES).
Cruise ships, large yachts, and navy ships are following this trend, which has ship propellers being driven by powerful electric motors. AES offer benefits when energy requirements fluctuate sharply. Electric motors can deliver such varying outputs more efficiently and rapidly than diesel engines, which are most economical at constant engine speeds.