1. Designing an electromechanical generator for energy harvestingFranjo Pranjić, Nejc Smolar, Peter Virtič, 2021, izvirni znanstveni članek Opis: Five different designs of tubular electromechanical generator for low frequency energy harvesting have been investigated in this paper. In order to design a simple and robust generator, models were constructed out of permanent magnets, steel and windings. In all five generator models, round movers were used in spherical and cylindrical form- for four models solely permanent magnets were used, and in one model, there was steel present in the mover. The movers are slid or rolled through a tube, and induce voltage in the stator winding. All windings were constructed with the same cross- -section dimensions and number of turns. To compare different models, 3D analysis with the Finite Element Method was performed, in order to determine the magnetic flux through the windings. The induced voltage was calculated using the results of the analysis. As a result of the different winding geometries, the average turn length varied for the different designs, subsequently altering resistance and inductance, which affected the generator`s power output and losses. To simulate the generator`s dynamics, an equivalent circuit model was constructed using the Simulink software and data obtained previously from a 3D electromagnetic analysis. With the Simulink model, we coupled the mechanical and electrical systems together to acquire the harvester yields.
Ključne besede: energy harvest, linear generator, permanent magnets, Finite Element Method
Objavljeno v DKUM: 13.11.2023; Ogledov: 63; Prenosov: 4
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2. Experimental verification of the numerically determined parameters for the non-linear two-axis model of a synchronous motor with interior permanent magnetsŽeljko Hederić, Venco Ćorluka, Toni Varga, 2021, izvirni znanstveni članek Opis: Synchronous machines belong to the family of electrical machines characterised by a synchronous magnetic rotating field in the air gap of the machine, the speed of which depends on the frequency of the currents in the armature winding. The paper presents procedures and methods for the numerical determination and experimental verification of the parameters for a nonlinear two-axis model of a synchronous motor with permanent magnets in the rotor (IPMSM) and a concentrated stator winding. To calculate the distribution of electro-magnetic fields in the motor accurately, models with distributed parameters are used in motor design, for which the Finite Element Method (FEM) is usually employed. The improvement by using the model with concentrated parameters considerably simplifies the physical model, by describing it with a system of (non)linear differential equations, the so‐called partial differential equations, which is presented in this paper.
Ključne besede: synchronous motor, flux linkage, interior permanent magnets, non-linear
Objavljeno v DKUM: 13.11.2023; Ogledov: 54; Prenosov: 3
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3. 3D coupled electromagneticthermal analysis of a hybrid electromagnetic system with magnetic flux modulationIvan Hadzhiev, Iosko Balabozov, Vultchan Gueorgiev, Ivan Yatchev, 2021, izvirni znanstveni članek Opis: This paper presents a study of the electromagnetic and thermal field of a new construction of a hybrid electromagnetic system with magnetic flux modulation. The numerical studies were realised using the finite element method. The coupled problem electromagnetic field-electric circuit-thermal field was solved. A computer model of the hybrid electromagnetic system was developed for the purpose of the study using the software programme COMSOL. Results for the distribution of the electromagnetic and thermal field in the hybrid electromagnetic system with magnetic modulation were obtained at different supply voltages.
Ključne besede: Coupled problems, finite element analysis, hybrid electromagnetic system, magnetic flux modulation, permanent magnets
Objavljeno v DKUM: 13.11.2023; Ogledov: 61; Prenosov: 3
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4. Impact of stator pole shape of synchronous motor on torqueAnton Hamler, Mladen Trlep, Bojan Štumberger, Marko Jesenik, 2002, objavljeni znanstveni prispevek na konferenci Opis: The paper presents pole modelling of small one phase 10 poles synchronous motor with permanent magnets. The purpose of stator pole modelling is to provide a reliable operation of the motor with in advance prescribed direction of rotation with 80 % of the rated voltage. For analysis of magnetic conditions the 2D finite element method was used. Intuitive and trial modelling procedures were used for pole modelling.
Ključne besede: synchronous motors, permanent magnets, magnetic analysis, finite element method, stator pole, stator pole modeling
Objavljeno v DKUM: 01.06.2012; Ogledov: 1949; Prenosov: 45
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