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| Research on a Tubular Linear Permanent Magnet Machines with Dual Translators for Low Speed Wave Energy Conversion |
| Zhang Jing1,2, Yu Haitao2, Shi Zhenchuan2 |
1. School of Electrical Engineering Jinling Institute of Technology Nanjing 211169 China;
2. Engineering Research Center for Motion Control of MOE Southeast University Nanjing 210096 China |
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Abstract In this paper, a tubular linear PM (permanent magnet) generator with dual translators and dual Halbach PM arrays is presented for low speed direct-drive wave energy conversion. The operation principle is illustrated to increase the flux density, efficiency, and decrease the detent force. Firstly, based on electromagnetic loading, motion displacement, and average speed, the structure and parameters of the generator are obtained. The electromagnetic characteristics are analyzed and verified using finite element method (FEM) and magnetic field analysis model. Secondly, the structures of Halbach PM arrays are optimized to increase radial magnetic flux density and decrease axial magnetic flux density. In the condition of constant speed and sine speed, the output efficiency is calculated. Finally, a tubular prototype is tested in the condition of different wave parameters. All the results show that compared with other linear generators, the generator with dual translators have the advantages of high flux density, high output efficiency, and low detent force fluctuation.
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Received: 14 July 2017
Published: 15 October 2018
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2018, Vol. 33 
