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Forti, 18 2.5 2.25 2 1.75 1.5 1.25 1 0.75 0.5 0.25 0 -0.35 -0.25 -0.15 -0.05 0.05 Time (s) 109 87 RPM 87 RPM 70 RPM 48 RPM 21 RPM 0 RPM 0.15 0.25 0.35 Open Circuit Voltage (V) Figure 13: Open circuit voltage of a single DC-TENG at various rotational speeds, as indicated by the accompanying blocks on the right of the figure. Each data set contains a nearly uniform horizontal line which corresponds to a reading of zero volts, to elucidate analysis each was offset by a different amount. The proportionate difference between each peak and the baseline for that data set is preserved. Critically, the consistent orientation of the voltage spikes is a strong indicator that the desired direct current output was produced (when any energy was being produced at all). In other tests, the voltage spikes are largely negative. This is solely due to the arrangement of the channel probes, and would switch sign if these probes were reversed. In the figure, as the rotational speed increased, so too did the frequency and magnitude of the voltage spikes produced by the DC- TENG. Although the maximum output was only between 0.1 V to 0.4 V, this data was only collected at speeds up to 109 RPM, Zhang et al. performed tests between 150 and 1350 RPM [1]. At increased speeds, the energy production is expected to be much greater, increasing linearly [1]. Short Circuit Current of Model 3.2 Short circuit current density, obtained by dividing the output current of a DC TENG by the effective surface area (defined as the surface area of a single face of the PVC layer), is the primaryPDF Image | Triboelectric Turbines: Multi-Rotor Counter-Rotating Wind Turbine Utilizing Direct-Current Triboelectric Nanogenerators
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