微驻极体发电机是很有潜力的拾取环境动能的技术，但已有发电机远未达期待的输出。本项目面向可穿戴设备，研制聚合物纳米复合材料高性能微型驻极体发电机。研究内容包括：高性能驻极体制备和荷电增强方法及荷电稳定性，驻极体发电机理论建模，寄生电容对发电输出特性影响，发电机设计及加工方法，发电机输出提取方法。创新点包括：提出利用荷电密度高的SiO2纳米颗粒与荷电稳定性好的聚合物结合制备纳米复合材料驻极体，同时利用多层微米级驻极体薄膜叠层，提高驻极体总荷电量和稳定性；提出无驻极体基底电极驻极体发电机，驻极体电荷都用于诱导工作电极可输出有效电荷；提出包含寄生电容的无驻极体基底电极发电机理论模型；利用低介电常数多孔聚合物作为电极衬底，降低寄生电容的同时，通过调节孔隙率调节寄生电容；借鉴永磁电机设计思想，采用对称结构使驻极体与电极诱导电荷间纵向静电吸引力互相抵消，同时采用三相模式提高整流输出电压稳定性和转换效率。

Micro electret generators have an good potential to harvest motion energy from surrounding environment. But the existing micro electret generators failed far to reach expected power output. This project will develop a high-performance micro electret generator based on polymer nanocomposites for power supply for wearable devices. The research content includes: Investigating the preparation method of high-performance electret and the charging enhancement method; Analyzing the charging stability of the electret; Theoretically modeling the electret generator; Analyzing the effect of parasitic capacitance on power output of the generator; Investigating methods of design, fabrication and output extraction of the electret generator. The innovative points include: Combining SiO2 nanoparticles which have a potential of high charge density and polymer with good charge stability to prepare high-performance nanocomposite electret, at the same time using laminated multilayers of charged electret films to increase the total charge quantity and stability; Novel electret generator without electrodes under electrets, whose charges will be all used to induce effective charges in the working electrodes to generate power output; New theoretical model of the electret generator without electrodes under electret, which includes parasitic capacitance; Using porous polymer with low dielectric constant as the electrode substrate to reduce parasitic capacitance, at the same time, to adjust the parasitic capacitance by adjusting porosity; Referencing the design idea of permanent magnet motors, the electret generator will have a symmetrical structure to make that the longitudinal electrostatic attractive forces between the electrets and the electrodes having induced charges counteract each other, and the mode of three-phase will be adopt to improve the smoothness of rectifier output voltage and the conversion efficiency.