Abstract
Linear electric generators are increasingly used in autonomous systems that require a compact source of electricity and when it is necessary to simplify mechanisms of power systems. To study the characteristics of a linear electric generator, an analytical model of its magnetically active part was proposed. The model is based on the assumption of the periodicity of linear translational motion of the armature relative to the stationary cylindrical winding. Based on the representation of the magnetic field of the generator’s armature by cylindrical harmonics of the scalar potential, the magnetic flux generated by the inductor was analyzed. The inductor design contains several pairwise oppositely oriented cylindrical permanent magnets. The use of representations based on cylindrical harmonics for the magnetic flux and EMF induced in a circular circuit has made it possible to substantiate the rational number of cylindrical armature magnets and their geometric parameters. The losses caused by the technological necessity of using annular magnets instead of solid continuous cylindrical ones with the same overall dimensions were estimated. Analysis of losses of the magnetic flux linkage with the current winding resulting from the presence of technologically necessary clearance between the permanent magnets and the winding sections was carried out. An analysis of arrangement and switching of the winding sections was carried out. It has made it possible to justify the choice of rational cross-sectional dimensions. For experimental verification of the analytically obtained results, a physical model of a linear electric generator with an armature containing permanent cylindrical magnets was designed. Its translational periodic movement was provided through an external electric drive. Analysis of the EMF dependences recorded with a digital oscilloscope with a small (5 %) error has confirmed the obtained analytical results and correctness of the theses underlying the model
Highlights
One of the current trends in the development of science and technology is expanding the scope of the practical application of linear electric generators of various types and purposes
As a result of a cylindrical harmonic analysis of the magnetic field created by permanent armature magnets, an analytical model of the magnetically active part of a linear electric generator was developed
It features the inclusion of losses in a form of scatter fields in the analysis of magnetic flux in the current winding as well as the possibility of representing instantaneous electromotive force (EMF) values in accordance with the law of mechanical movement of the armature
Summary
One of the current trends in the development of science and technology is expanding the scope of the practical application of linear electric generators of various types and purposes. “green” power engineering in which a linear electric generator is used to convert the energy of sea waves is one of the areas of application [1]. Coupled with an internal combustion engine, a linear electric generator forms an energy system of various autonomous objects [2]. The advantages of this arrangement in the power plant configuration [3] include compact design, simplification of the mechanical part of the system, and its higher reliability due to exclusion of crank elements, etc. The choice of design options of the linear electric generator itself is possible. A fixed stator is used with a reciprocating inductor. This work is devoted to studying the magnetically active part of a linear electric generator in order to develop and experimentally verify an analytical model for the initial calculation of its main parameters
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