Research on Primary Excitation Fully Superconducting Linear Generators for Wave Energy Conversion

Linear generator-based direct-drive wave energy converters have a simple structure and high stability and provide high efficiency, thereby exhibiting great potential. However, with a low direct-driving speed, a low power density is inevitable. This paper proposes a primary excitation fully superconducting linear generator. All superconducting armature windings are located on the primaries, without motion. A cryocooler and cooling system can be simplified. Two other traditional primary excitation linear generators are compared with the proposed generator. Results show that the proposed generator has higher output voltage, lower harmonic rate, lower voltage-adjusting rate, and larger output power than the two traditional linear generators.