Inspired by an electromagnetic hydropower station that contains a reverse polarized magnet, we proposed a new design methodology of electret rotatory energy harvester (e-REH) with bipolar-charged electrets for boosting its output performance. A selectively localized corona discharging method is invented to have both positive and negative ultra-high-resolution charges implanted into a single electret thin film. A generalized theoretical model of bipolar-charged e-REHs with free-standing (Fe-REH) and sliding (Se-REH) operation modes is derived to evaluate their performance. The key features affecting their performance are the initial and parasitic capacitances with different connection schemes. Experimental results show that: the output power of the bipolar-charged e-REH is increased to 392.2% compared to those of the positive alone and negative alone configurations, which fully agree with those obtained from the theoretical model. For the first time, an intelligent thrust ball bearing is designed and fabricated with its self-powered and self-sensing capabilities based on the bipolar-charged e-REH. The rotation speed of the bearing is characterized by the response frequencies of the output voltage by Fast Fourier Transform instead of the output voltage amplitudes, exhibiting an ultra-high frequency sensitivity of 15.0 rpm/Hz and a good linearity R² (coefficient of determination) of 99.9%. The developed e-REH has potential applications for high-precision and self-powered intelligent rotation-speed sensing

受包含反向极化磁铁的电磁水电站的启发，我们提出了一种带有双极电荷驻极体的驻极体旋转能量收集器 (e-REH) 的新设计方法，以提高其输出性能。发明了一种选择性定域电晕放电方法，将正负超高分辨率电荷注入到单个驻极体薄膜中。推导出具有独立 (Fe-REH) 和滑动 (Se-REH) 操作模式的双极电荷 e-REH 的广义理论模型来评估其性能。影响其性能的关键特征是具有不同连接方案的初始电容和寄生电容。实验结果表明：双极性e-REH的输出功率提高到392。2% 与单独的正面和单独的配置相比，这与从理论模型中获得的完全一致。首次在双极充电 e-REH 的基础上设计和制造了具有自供电和自感应能力的智能推力球轴承。轴承的转速由快速傅立叶变换的输出电压响应频率而不是输出电压幅值表征，表现出15.0 rpm/Hz的超高频率灵敏度和良好的线性R²（测定系数）为 99.9%。开发的e-REH具有高精度和自供电智能转速传感的潜在应用