针对中国海况，研究了一种小功率的低速直驱型洋流能发电机，通过对发电机的长径比、气隙长度、定子内径等关键参数进行设计和优化，确定了发电机的最终方案。采用2D有限元对发电机的齿槽转矩和变速变载性能进行了仿真计算，理论上进一步校核了发电机的运行特性。加工制造了样机并进行了详细的厂内测试，测试结果进一步验证了设计方案的合理性，确认了发电机能够在额定工况下输出200 W功率，且变速变载运行性能良好。
This paper investigates a low-speed direct-driven small generator for the marine energy under the ocean conditions in China. The final dimensions of the generator are determined by analyzing and optimizing the key parameters, such as the length-diameter ratio, the air-gap length and the inner stator diameter. Then the characteristics of the cogging torque and the varying speed and loads are calculated by the 2D FEM and the analytical formulas to analyze the running performance. Further, a prototype is fabricated and the manufacturing test is conducted to validate the design. The experimental results show that the designed generator can meet the requirements of the rated output power 200 W, and enjoys a good performance under the conditions of the varying speed and loads. This research may serve as a reference for designing and controlling the low-speed direct-driven generators for the marine energy.
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