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Description
The direct-drive wave energy converter (DD-WEC) system, using linear generator, are widely used for WEC. However, at the low direct-drive speed, how to increase the power density of the linear generator is the main objective of the researchers. Therefore, there are many linear generators have been investigated for DD-WEC. To solve the problem, a transverse flux hybrid field modulated linear generator linear generator is proposed in this paper. Field modulated design can be increase the out put voltage and power density of the linear generator. Transverse flux magnetic circuit is implemented to reduce the eddy loss in the core of stator. The hybrid excited field coil can be used to adapt to the different wave situation and effectively improve the output performance of this kind of generators. By using 3D FEM, a tubular transverse flux hybrid field modulated linear generator is studied on account of the hydrodynamic analysis. The design and optimization of the proposed generator is accomplished. In view of the ratio between stator pole and translator pole pitch being defined, the major component of the cogging force is that caused by longitudinal end effect. The ratio between stator pole and translator pole pitch is optimized to reduce the cogging force. Simulation and comparison have been conducted for the generators with different pole numbers of stator and translator. In addition, the translator is designed to reduce the harmonic of inducted EMF. Lastly, the parameters of the final optimization generator are obtain and listed. The performances of output power, output voltage, and efficiency of the proposed generator with different resistance are compared. From the output performance, it can be seen that the output power of the proposed generator meet the design requirements. And the low output voltage regulation, a higher range of power levels and loading capacity can be obtained.
| Submitters Country | China |
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