轮缘驱动潮流能发电机关键参数设计分析及运行特性研究

Key Parameter Design and Operation Characteristic Research of Rim-driven Marine Current Generators

轮缘驱动潮流能发电机径向大而轴向短,发电机直接浸泡在海水中,且气隙内有海水自由流动,因此,轮缘发电机在设计方法和运行特性方面与常规电机存在较大区别。论文首先介绍系统能量转换基本原理和基本结构特点,然后分析轮缘发电机转子设计、气隙设计、定子、电磁负荷设计及极槽数配合等关键参数设计方法,研究表明轮缘发电机线负荷不宜取得较大,而其电流密度则可选择在10-20A/mm2范围内。研制2.5kW样机,采用有限元仿真结合样机试验的方法,分析空载特性、负载特性、效率特性及非理想气隙情况下齿槽转矩特性。试验结果与理论分析相吻合,可验证理论析的正确性。论文的研究结论可为轮缘驱动发电机的设计及分析提供参考。

In rim-driven marine current generators(RMCG), the radial dimension is quite large, but the axial length is very short. The whole generator is submerged into water so that the air gap is filled with sea water. Therefore, the parameter design and operation characteristics are different with conventional electrical machines. Firstly, this paper presented the energy conversion principle and structure characteristics. Then, the key parameter design methods of its rotor, air gap, stator, electromagnetic load and pole-slot match of RMCG were discussed. The results show that line load should not be too large but the current density can be selected between 10-20 A/mm^2 in RMCG. 2.5 kW prototype was manufactured. Simulations by the finite element method and prototype experiments were presented to analyze the characteristics of no-load, load, efficiency and cogging torque in non-ideal air gap of RMCG. The experimental results match the simulation results so that the theoretical analysis is validated. Therefore, the proposed research conclusion can serve as a designing reference for RMCG.