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Design and Analysis of a Fully-Superconducting Primary-Excitation Linear Generator for Direct-Driven Wave Energy Generation
Author(s): 
Pages: 80-86
Year: Issue:  2
Journal: Transactions of China Electrotechnical Society

Keyword:  Linear generatorfully-superconductingprimary-excitationdesignfinite element analysis;
Abstract: Primary permanent magnet linear generators have advantage of simple structure of secondary, which is suitable for the application of wave energy conversion. Based on the vernier hybrid machines(VHMs), widely used for direct drive wave energy converters, and f lux-switching permanent magnet linear machines(FSPMLMs), this paper proposes a novel tubular fully-superconducting primary-excitation linear generator(FSPELG), which can effectively improve the performance of this kind of generators. Mg B2 type windings and multi-tooth structure are used in the generator to increase the magnetic energy and overcome the disadvantages of easily irreversible demagnetization and high cogging force of the VHMs and FSPMLMs. Firstly, the operation principle and structure of the generator are introduced. Based on the Mg B2 wire, produced and measured in the laboratory, the structure of DC superconducting filed windings and AC superconducting armature windings used for the generator are designed, and AC losses of AC windings are calculated. Secondly, by using the finite element method, the no-load performances of the generator are analyzed and compared with ones of a VHM and a FSPMLM. In addition, the on–load performance of the proposed generator is obtained by finite element analysis(FEA). Lastly, a prototype of the linear flux-switching generator is used to verify the correctness of FEA results. All the results validate the proposed generator has better performance than its counterparts.
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