Wojciech Szeląg

The influence of magnetic hysteresis on magnetorheological fluid clutch operation

Purpose – The purpose of this paper is to elaborate upon the mathematical model of coupled electromagnetic, fluid dynamic and motion phenomena that will allow for investigation of the magnetic hysteresis influence on the axial symmetry magnetorheological fluid (MRF) clutch operation.Design/methodology/approach – To solve the partial differential equations describing magnetic vector and fluid velocity potential distributions in axial symmetry MRF electromechanical transducers the finite‐element methods have been applied. To solve model equations in the time domain, the time stepping method have been adopted. To introduce magnetic hysteresis phenomenon to presented approach the Jiles‐Atherton model have been applied. The physical properties of MRFs have been modeled by means of the Bingham model. Owing to high nonlinearity of the considered problem to solve obtained matrix equations systems the iterative Newton‐Raphson combined with the block over relaxation method have been applied.Findings – The proposed ...

Analysis of power parameters of the squirrel cage motor and LSPMS motor with U-shaped magnets

The paper presents the special algorithm and software for the transient FE analysis of electromagnetic phenomena in a squirrel cage induction motor and in a line start permanent magnet synchronous motor. The presented algorithm and the elaborated specialized software for the finite element analysis of transients and steady states are used to determine the power parameters of the squirrel-cage induction motor as well as the Line Start Permanent Magnet Synchronous Motor (LSPMSM). The nonlinearity of the magnetic circuit, the movement of the rotor and the skewed slots have been taken into account. The results of computations have been compared with measurements. The conclusions from the comparison of calculation results with the results of measurements were presented. (Analiza parametrów energetycznych silnika indukcyjnego klatkowego i silnika synchronicznego z magnesami w kształcie litery U o rozruchu bezpośrednim). Streszczenie. W artykule przedstawiono model polowy oraz opracowane na jego podstawie algorytm oraz oprogramowanie do analizy procesu rozruchu i ustalonych stanów pracy silnika indukcyjnego klatkowego oraz silnika synchronicznego magnetoelektrycznego przystosowanego do rozruchu bezpośredniego. W rozważaniach uwzględniono nieliniowość obwodu magnetycznego, ruch wirnika oraz skoszenie żłobków wirnika w silniku indukcyjnym. Obliczenia związane z uwzględnieniem skosu rdzenia stojana wykonano przy zastosowaniu modelu quasi-trójwymiarowego. Zaprezentowano wybrane rezultaty badań symulacyjnych i laboratoryjnych. Przedstawiono wnioski wynikające z porównania wyników obliczeń z rezultatami pomiarów.