摘要
提出了一种直驱海浪发电用圆筒型单相永磁直线发电机(PMSPLG)设计方案,该电机具有初级结构简单、体积小、定位力波动幅值小的特点。首先,论文给出发电机的结构和工作原理,分析了采用Halbach永磁阵列的电机气隙磁场。其次,在旋转电机磁场能量计算方法的基础上对直线电机齿槽定位力的计算公式进行推导,得到圆筒型直线电机的齿槽定位力波动统一公式;并采用有限元方法(FEM)对电机在不同槽距和极距的匹配情况下,对电机的定位力进行仿真分析,得到电机的槽距和极距的最优尺寸。最后,分析了PMSPLG在恒速和正弦变化速度下的空载电动势变化曲线。论文给出单相永磁直线发电机同尺寸样机,实验验证了电机的电磁特性。计算与实验结果表明该直线发电机具有定位力波动幅值小、后续整流电路简单的特点;与其他采用旋转电机的波能发电装置相比,具有能量转换效率高、系统结构简单、应用成本低等特点,在海浪发电领域具有较好的应用前景。
A novel permanent magnet single phase linear generator （PMSPLG） is proposed for direct-drive wave energy conversion. The proposed motor has advantage of simple primary structure. Firstly, the structure and operation principle of the PMSPLG are introduced, and the air-gap field of the generator with Halbach arrays are analyzed. Secondly, based on the rotating electrical machine characteristics, the co-energy method is implemented to derive the cogging force equation. And the 2-D finite element method （FEM） is implemented to investigate the cogging force and the optimized structure of slot pitch and pole pitch is obtained. Additionally, the no-load performance of the generator is investigated at the constant speed and sine variation speed respectively. Lastly, an experimental prototype is used to test the characteristics of the proposed PMSPLG. The analysis and simulation results are validated by the ones of experiment. Due to theoretical analysis results of prototype concordant with the finite-element analysis results, the proposed model and analytical method are correct and effective. This kind of PMSPLG has wide application in the field of wave energy conversion.
出处
《电工技术学报》
EI
CSCD
北大核心
2013年第7期110-116,共7页
Transactions of China Electrotechnical Society
基金
国家自然科学基金(41076054)
江苏省科技支撑计划(BK2008321)资助项目
关键词
海浪发电
永磁单相直线电机
定位力
Halbach永磁阵列
有限元方法
Wave energy conversion, permanent magnet single phase linear motor, cogging force, Halbach arrays, finite element method
