Abstract
Self-powered triboelectric tachometers have wide application prospects in mechanical and electrical industries. However, traditional disc-type tachometers typically require large contact force, which burdens rotary load and increases frictional wear. To reduce the friction force of triboelectric tachometers, we present an alternative structure defined by flapping between rigid and flexible triboelectric layers. In this work, we further characterize this type of tachometer, with particular focus on the oscillating relationship between output voltage and rotation speed due to the plucking mechanism. This oscillating relationship has been demonstrated both theoretically and experimentally. For future self-powered triboelectric tachometers, the proved oscillating relationship can be applied as calibration criteria for further enhancing sensitivity and linearity in rotation measurement.
Highlights
In the Internet of Things era, massive sensing equipment is indispensable for the realization of intelligent buildings, transportation, cities, etc. [1]
Triboelectric nanogenerators can be inherently incorporated into sensors to construct self-powered devices [6,7,8], which further alleviates the powering issue and has already found numerous applications in wearable electronics [9,10,11], blue energy [12,13,14], infrastructure monitoring [15,16,17], etc
There have been plenty of disc-based tachometers reported [19,20,21,22,23], which typically consist of a rotating disc with constant rotation speed and a fixed disc facing the rotating one
Summary
In the Internet of Things era, massive sensing equipment is indispensable for the realization of intelligent buildings, transportation, cities, etc. [1]. As the flexible stator exhibits varying deflection and velocity in the self-oscillation process, the original equilibrium state cannot be guaranteed for the contact, and this results in change of actual deflection state and, output voltage. In this way, we set f s to be a constant value of 29.79 Hz, i.e., the self-oscillation cycle of values, we adopted specific parameters as: m = 0.01 kg; k = 350 N/m; ξ = 0.1; F = 1 N; and the flexible stator was Ts = 0.033 s, but we swept the revolving cycle T to obtain varying tc = 1 ms. With the help of ∆dn and ∆vn , more generalizations could be obtained from Figure 2 in terms of the maximal change of tip displacement and velocity in each contact.
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