Abstract
To realize the self-power of the vehicle micro-sensors, a piezo-electromagnetic hybrid vehicle-mounted energy harvester is proposed to recover the wind and vibration energy generated during driving. This energy harvester includes a flutter piezoelectric energy harvesting structure (FPEH) and an electromagnetic vibration energy harvester structure (EVEH). The combination of the two structures can improve the energy harvesting effect and reduce the cut-in wind speed. The coupled vibration mathematical model is established to predict the output performance of the wind energy harvesting effect. The effects of the different distances between magnets on the output are discussed. And the vibration characteristics of piezoelectric and electromagnetic vibrators are analyzed. Results show that the energy-harvesting effect is the best when the distance between magnets is 30mm. At the same time, the numerical simulation proves that the wind energy harvesting effect of the hybrid structure is better than the classic flutter structure. The experimental verification is carried out, and the experimental results are consistent with the theoretical prediction results, which verified the correctness of the theory. The optimal load of FPEH is 70kΩ , and the optimal load of EVEH is 60Ω. Under these conditions, when the wind speed is 18m/s, the peak output power of FPEH is 14.5mW, and that of EVEH is 31.8mW.
Highlights
Traveling on roads, vehicles will inevitably generate a lot of recyclable energy [1], [2], and cars are equipped with many low-power microelectronic devices and wireless sensors [3], [4], which provides an application foundation for applying micro energy harvesters to cars
Magnetic coupling between magnets A and B can achieve broadband harvesting from base vibrations, reduce the cut-in wind speed, and increase the energy harvesting effect [31], [40]
M2u2 + C2u2 + Keu2 + θeI2 = FAB−x θeu2 − LcI2 − (R2 + RC ) I2 = 0 where M2 is the mass of magnets B, θe is the electromagnetic coupling coefficient, u2 is the displacement of the magnet B, Ke is the spring stiffness of the electromagnetic vibrator, C2 is the mechanical damping coefficient of the electromagnetic vibration energy harvester (EVEH), R2 is the load resistance of the EVEH, I2 is the current flowing through the resistor R2, Lc is the coil inductance, Rc is the coil resistance value and u2 is the vibration displacement of magnet B and FAB−x represents the component of the repulsive force of magnet A to magnet B in the x-direction
Summary
Vehicles will inevitably generate a lot of recyclable energy [1], [2], and cars are equipped with many low-power microelectronic devices and wireless sensors [3], [4], which provides an application foundation for applying micro energy harvesters to cars. A micro harvester that recovers vibration energy and wind energy at the same time can replace traditional chemical batteries to supply power for microsensors or wireless electronic devices It can effectively solve the problems of battery replacement, environmental pollution, and high cost [7]–[10]. As the electromagnetic suspension energy recovery system has the characteristics of high recovery efficiency, fast response, and strong controllability, the research of vehicle vibration energy collection mainly focuses on the recovery of vibration energy of vehicle suspensions [32], [33] This kind of energy harvesters need to change the internal structure of suspensions, and the cost is relatively high, they are not suitable for the power supply of the low-power microelectronic system. By conducting energy harvesting experiments, the correctness of the mathematical model is verified
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
