A Combination of a Vibrational Electromagnetic Energy Harvester and a Giant Magnetoimpedance (GMI) Sensor

Abstract

An energy harvesting device combined with a giant magnetoimpedance (GMI) sensor is presented to analyze low frequency vibrating systems. An electromagnetic harvester based on magnetic levitation is proposed for the electric power generation. The device is composed of two fixed permanent magnets at both ends of a cylindrical frame, a levitating magnet acting as inertial mass and a pick-up coil to collect the induced electromotive force. At the resonance frequency (10 Hz) a maximum electrical power of 1.4 mW at 0.5 g is generated. Moreover, an amorphous wire was employed as sensor nucleus for the design of a linear accelerometer prototype. The sensor is based on the GMI effect where the impedance changes occur as a consequence of the variations of the effective magnetic field due to an oscillating magnetic element. As a result of the magnet’s periodic motion, an amplitude modulated signal (AM) was obtained, its amplitude being proportional to mechanical vibration amplitude (or acceleration). The sensor’s response was examined for a simple ferrite magnet under vibration and compared with that obtained for the vibrational energy harvester. As a result of the small amplitudes of vibration, a linear sensor response was obtained that could be employed in the design of low cost and simple accelerometers.

Functionalization of Internal Resonance in Magnetically Coupled Resonators for Highly Efficient and Wideband Hybrid Vibration Energy Harvesting

“… Comparison of the proposed harvester SFoM with the current state-of-the-art [ 35 , 56 , 57 , 58 , 59 , 60 , 61 , 62 , 63 , 64 ]. …”

A Review on Kinetic Energy Harvesting with Focus on 3D Printed Electromagnetic Vibration Harvesters

“…In [43], a vibration harvester with magnetic levitation was proposed. The device consisted of a cylindrical housing made of PLA, four magnets and a coil (1000 turns).…”

“…In [60], a dry lubricant was applied to counter this issue. In [49], graphite powder was used as lubricant to reduce the friction and in [43] guide rails were utilised. In [50], a reduction in viscous damping was achieved with holes in the housing to improve the airflow.…”

A Study on the Energy-Harvesting Device with a Magnetic Spring for Improved Durability in High-Speed Trains

“…The increased contact impact of the mechanical stopper and the reduced performance for the limiting displacement of the metal springs in the VEH device (hereafter referred to as a metal spring VEH device) can lead to deformation or fatigue fracture due to stress concentration in the metal spring. Therefore, in this study, in an effort to solve the durability problem of VEH devices, an experiment was conducted to apply a magnetic spring [ 42 , 43 , 44 ], which is non-contact and not-fatigue damage, to a VEH device using the repulsive force of permanent magnets (hereafter referred to as a magnetic spring VEH device). The experiment was conducted to examine the potential energy-harvesting power using the magnetic spring VEH device in the laboratory.…”