Free‐Fixed Rotational Triboelectric Nanogenerator for Self‐Powered Real‐Time Wheel Monitoring

Abstract

Developing an applicable triboelectric nanogenerator (TENG) for train wheel energy harvesting is a key step to meet the urgent need of wheel safety monitoring. Herein, an innovative design of free‐fixed TENG (FF‐TENG) is reported, without a serious negative impact on the wheel. The key of this design is the magnets fixed on the device and bogie, providing attractive force to immobilize the stator. With a rotational structure, FF‐TENG can provide a high short‐circuit current of 55 µA, an open‐circuit voltage of 500 V, and a charge of 235 nC at a rotation speed of 400 rpm. At an external load resistance of 10 MΩ, FF‐TENG delivers the maximum power of 15.68 mW. Furthermore, the superior robustness of FF‐TENG in vibration environment is proved. In addition, a power management circuit designed by LTC 3588 is tested for more efficient capacitor charging, leading to better performance to power electronics. Finally, a self‐powered real‐time wheel temperature and wheel speed monitoring system is developed with FF‐TENG as a safety alert demo for feasibility demonstration. Given the rational structure design and high performance, this work paves a practical way for TENGs in the field of intelligent transportation.

Triboelectric Circular Motion Sensor with Variable Friction Type and its Service Performance Research

“…When the slider speed reaches 212.6 mm/s, the short-circuit currents of the three types of TCMS-VFT are 2.6, 0.22, and 2.1 μA. The test results are also consistent with the conclusions of the reported literature. , The maximum instantaneous power of TCMS-VFT with three friction types under different load conditions is also investigated. The experimental results of the load power characteristics are illustrated in Figure.…”

“…The test results are also consistent with the conclusions of the reported literature. 18,24 The maximum instantaneous power of TCMS-VFT with three friction types under different load conditions is also investigated. The experimental results of the load power characteristics are illustrated in Figure . 3a-iii, b-iii, and c-iii.…”

A High Sensitivity Self-Powered Wind Speed Sensor Based on Triboelectric Nanogenerators (TENGs)

“…The sensor network technology has attracted much attention [ 6 , 7 , 8 , 9 ] with the development of Internet of Things (IoT) and artificial intelligence. However, the traditional power supply for sensor systems is batteries, with disadvantages such as high cost, difficulty to maintain, service life, and environmentally unfriendliness, and so forth [ 10 , 11 , 12 , 13 ]. Therefore, self-powered systems have gradually attracted attention.…”

Recent Progress in Self-Powered Sensors Based on Triboelectric Nanogenerators

“…Wang designed a self-powered TENG which can monitor wheel temperature and wheel speed in real-time during train running [33]. As presented in Figure 4e, Chen et al [34] developed a self-powered motion tracking system to monitor the speed, direction, acceleration, start and end positions, and even the motion path of moving objects. This research will provide a new idea for TENG in the field of self-powered motion detection.…”