Numerical and experimental investigation of a magneto-electro-mechanical oscillator with a new magnet – coil interaction model and energy harvesting
Dariusz Grzelczyk, Mateusz Wojna, Ewelina Ogińska, Grzegorz Wasilewski, Jan Awrejcewicz
Abstract
The paper investigates a unique configuration of magneto-electro-mechanical system in terms of numerical simulation and experimental analysis. The harmonically excited mass of the oscillator with magnets being suspended by the magnetic spring interacts with the electric coil, inducing current in its’ circuit. Existing and often empirical models found in the literature do not fully describe the interaction between the permanent magnet and the multi-layer and multi-turn electric coil. This work fills this gap by proposing and validating a novel, easy to use model of magnet-coil interaction for either analytical or numerical calculations. An additional point of interest lies in the developed experimental technique utilized to determine the magnetic dipole moment of the magnet. The behaviour of the system and the parameters influence have been extensively described and illustrated in various frequency characteristics and phase portraits. The identification of the key parameters has been carried out based on experimental studies led on a precisely constructed experimental stand including aerostatic supports, which allow for exact, axial guidance and eliminate dry friction phenomena in the system. A good agreement between the numerical simulation and experimental results has been achieved and illustrated, especially in terms of the values and shapes of the generated electromotive force and electrical power, which cannot be predicted on the basis of empirical models.