一种新型永磁直线振动发电机的设计与仿真研究

Design and Simulation of a New Type of Permanent Magnet Linear Vibration Generator

设计了一种新型永磁直线振动发电机,减小了动子与定子间的磁力。利用有限元仿真软件对所设计永磁直线振动发电机结构进行了优化。仿真结果证明:外壳采用导磁性能较好的硅钢材料、永磁体选用钕铁硼材料时,发电机输出电动势更高;随着永磁体厚度的增加,动子与定子间距的减小,输出电动势有效值逐渐增大;随着永磁体宽度的增加,输出电动势会出现一个极大值。最终确定外壳选用硅钢材料,永磁体选用钕铁硼材料,永磁体尺寸为100 mm×26 mm×5 mm,动子与定子距离为4 mm。在振动频率为1 Hz、振幅为30 mm的正弦位移激励下,发电机的输出电动势有效值为4.190 8 V,可输出最大功率为0.215 2 W。

A new type of permanent magnet linear vibration generator was designed, so the magnetic force between the mover and the stator was reduced. By using the finite element simulation software, the structure of the designed vibration generator was optimized. Simulation results proved that： the output voltage increased when the shell adopts the silicon steel material and the permanent magnet used the NdFeB material ; with the increase of thickness of the permanent magnet and the decrease of the distance between the mover and stator, the output voltage increased gradually, and that during the increase of the width of the permanent magnet, tile output voltage would have a maximum. Finally, the shell chosed silicon steel materials, the permanent magnet chosed NdFeB materials, the permanent magnet size was 100 mmx 26 mm x 5 mm, and the distance between the mover and stator was 4 mm. When the vibration frequency was 1 Hz and the amplitude was 30 ram, the effective value of output voltage was 4. 190 8 V, and the maximum output power was 0. 215 2 W.