点吸式波浪能直线发电机定位力优化分析

Analysis of the optimization of point absorption wave energy linear generator detent force

永磁直线发电机已越来越多地应用于波浪能发电领域。文章针对直线发电机优化过程中定位力的优化问题,基于点吸式波浪能发电装置中圆筒型永磁直线发电机,采用有限元法对不同尺寸参数下的边齿齿高、齿宽和气隙进行数值仿真,得到发电机的定位力、气隙磁感应强度、反电动势、电流和输出功率。通过正交试验,计算各因素对发电机效率和定位力的影响程度,验证数值仿真的可靠性。分别以发电效率最高和定位力最小为优化目的,设计两个优化方案,选取最优参数组合。结果表明:当追求功率最大化时,发电机功率均值增大102.9%,定位力均值增加46.3%;当追求定位力最小化时,发电机定位力均值减小66.5%,功率均值减小70.6%。故直线发电机定位力优化应同时考虑发电功率,并在功率优化后,再适当削减定位力。

Permanent magnet linear generators have been increasingly used in the field of wave energy power generation.For the question of optimization direction of detent force in the optimization process of linear generator,based on the cylindrical permanent magnet linear generator in point absorption wave energy generator.Firstly,the finite element method is used to simulate the height and width of the edge teeth and air gap of the generator under different size parameters.Then the detent force,gas gap magnetic induction strength,anti-electric potential,current and output power of the generator were obtained.Secondly,through the orthogonal test,the influence of various factors on the generator efficiency and detent force was calculated to verify the reliability of the numerical simulation.For the purpose of maximum power generation efficiency and minimum detent force,this study designed two optimization schemes,and selected the optimal parameter combination.The results showed that when pursuing power maximization,the average power of the generator increased by about 102.9%,and the average detent force increased by about 46.3%.However,when the detent force was minimized,the average detent force of the generator decreased by about 66.5%,and the average power decreased by about 70.6%.Therefore,the detent force should be reduced after the linear generator power optimization.