III. CONCLUSIONS
In this paper, trends in propulsion drive motor technology
for all-electric ships have been presented. The work has
examined the induction motor, permanent magnet
synchronous motor, high temperature superconducting
synchronous motor and superconducting homopolar DC
motor. Superconducting motors can be considered to be the
propulsion motor of the future as they offer significant weight
and volume reductions and improved acoustic performance as
compared to conventional motors.