This leads to a substantial decrease in the motor volume; which means a great increase in the power density.
In 2005 the General Atomics company received a contract for the creation of a large low speed superconducting homopolar motor for ship propulsion.
[1] Superconducting homopolar generators have been considered as pulsed power sources for laser weapon systems.
These worked, however the high cost of liquid helium cooling made them too expensive for most applications.
Because they are light-weight and therefore offer lower tower and construction costs they are seen as a promising generator technology for wind turbines.