Towards Self-Adaptability of Instrumented Electromagnetic Energy Harvesters

Abstract

Motion-driven electromagnetic energy harvesting is a well-suited technological solution to autonomously power a broad range of autonomous devices. Although different harvester configurations and mechanisms have been already proposed to perform effective tuning and broadband harvesting, no methodology has proven to be effective to maximize the harvester performance for unknown and time-varying patterns of mechanical power sources externally exciting the harvesters. This paper provides, for the first time, a radically new concept of energy harvester to maximize the harvested energy for time-varying excitations: the self-adaptive electromagnetic energy harvester. This research work aims to analyze the electric energy harvesting gain when self-adaptive electromagnetic harvesters, using magnetic levitation architectures, are able to autonomously adapt their architecture as variations in the excitation patterns occur. This was accomplished by identifying the optimal harvester length for different excitation patterns and load resistances. Gains related to electric current and power exceeding 100 can be achieved for small-scale harvesters. The paper also describes comprehensive case studies to verify the feasibility of the self-adaptive harvester, considering the energy demand from the adaptive mechanism, namely the sensing, processing and actuation systems. These successful results highlight the potential of this innovative methodology to design highly sophisticated energy harvesters, both for a small- and large-scale power supply.

Performance Optimization of Ultralow-Frequency Electromagnetic Energy Harvester Driven by Eccentric mass

“…However, how to capture these mechanical energies efficiently is a great challenge, especially regarding ultralow frequency vibrations [5,6]. The main principles of mechanical energy harvesting include the piezoelectric effect [7,8], electromagnetic effect [9,10], electrostatic effect [11,12], triboelectric effect [13,14], etc. By contrast, electromagnetic harvesters exhibit higher power and longer service time.…”

Design and Experimental Evaluation of an In-Wheel Flux-Switching Machine for Light Vehicle Application

“…Energy dissipated on the vehicle suspension is another possibility for energy harvesting. This system recovers waste heat energy from car bumper, while improving vehicle driveability and handling characteristics [8,9]. Electromagnetic-based systems are preferred due to their high efficiency, design simplicity, and controllability [10,11].…”