Self-powered triboelectric mechanical motion sensor for simultaneous monitoring of linear-rotary multi-motion

To realize the simultaneous monitoring of linear-rotary multi-motion, a linear and rotary coupled-motion triboelectric mechanical motion sensor (LRC-TMMS) with a gear-like engagement electrode (GE-electrode) is proposed. The displacement and velocity measurement of the linear and rotary motions can be realized by using GE-electrode, and the linear, rotary, and helical motions of the LRC-TMMS can be distinguished by the signal processing method of fundamental frequency separation. The results illustrate that the LRC-TMMS can achieve stable monitoring with a maximum linear stroke of 70 mm. And the linear fitting lines between the parameters of the output signal and that of the input motion are consistent with the theoretical reference results. In addition, the velocities monitored by the LRC-TMMS in different motions have good linearity, and most error rates are less than 3%. The practical monitoring performance of the LRC-TMMS in nine motion modes is verified using a commercial linear-rotary motor, which has potential application prospects in the fields of the intelligent manipulator and automated manufacturing.