Advances in High Temperature Superconductors (HTS) are enabling a new class of synchronous rotating machines, both motors and generators. Compared to conventional machines of equivalent rating, these machines are expected to be less expensive, lighter, more compact, efficient, and provide significantly superior stable operation in a power system. The field windings are made with HTh conductor material (BSCCO, or Bi-2223) which operates at 35-40 K and can be cooled with inexpensive, off-the-shelf cryocoolers available from a number of manufacturers throughout the world. HTS motors and generators are attractive for use in naval and commercial maritime industry applications. This paper discusses recent superconducting work relating to these new machines at American Superconductor Corporation (AMSC) and other companies. HTS rotating machine technology is maturing rapidly, and ship builders as well as the end-users will benefit enormously from these advancements.
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