自由活塞斯特林发电机空载磁场模拟及分析

Simulation and Analysis of Magnetic Field of Free-Piston Stirling Generator Under No-Load

自由活塞斯特林发电机是由自由活塞斯特林发动机和直线发电机耦合在一起构成的,在太阳能热利用以及热电联产等方面具有重要的应用价值。针对自由活塞斯特林发电机中的动磁式直线电机,设计了一种磁路结构,采用有限元软件Ansys/Maxwell进行模拟分析,建立了该磁路结构的动磁式直线电机的电磁场仿真模型,得到了直线发电机空载运行时不同位置的磁感线分布和磁感应强度分布云图,发现不论动子运行到任何位置,齿尖位置的磁感应强度总是最大。基于模拟结果,计算得到了直线发电机的空载感应电动势,其有效值为111.22 V。对动磁式直线发电机的空载性能模拟有助于对其进行优化设计。

The free piston Stirling generator is composed of free-piston Stirling engine and linear generator. It has important application value in solar thermal utilization and cogeneration combined heat and power. A magnetic circuit structure was designed for the moving-magnet linear generator in the free-piston Stirling generator. The finite element software(Ansys/Maxwell) was used for simulation and analysis. A electromagnetic field model of this moving-magnet linear generator was established. The distribution of magnetic induction lines in different positions and the distribution cloud maps of magnetic induction intensity were obtained for the linear generator under no-load operation. It is found that the magnetic induction intensity at tooth tip is always the largest no matter where the actuator moves. Based on the simulation results, the induced electromotive force of the linear generator under no-load was calculated to be 111.22 V. The performance simulation of the linear generator under noload is helpful to optimeze its design.