This paper presents an analysis of a Switched Reluctance Motor (SRM) with modified special stator structure. The presented motor is designed to propel vehicles, in particular electric bikes. The paper determines the variability of the electromagnetic torque, self-inductance and mutual inductance. A control system for the SRM and simulation results of calculations concerning time plots for currents and electromagnetic torque of the examined converter are presented.
Słowa kluczowe: e-bike, electric motor, electric vehicle, SRM, finite element method.
W artykule przedstawiono analizę stanów ustalonych przełączalnego silnika reluktancyjnego (SRM -Switched Reluctance Motor) o zmodyfikowanej geometrii stojana. Prezentowany silnik przeznaczony jest do napędu pojazdów elektrycznych, a w szczególności do roweru elektrycznego. W pracy wyznaczono zmienność momentu elektromagnetycznego, indukcyjności własnej oraz wzajemnej. Zaproponowano i przedstawiono układ sterowania dla silnika SRM, pokazano wstępne wyniki obliczeń przebiegów czasowych prądów oraz momentu elektromagnetycznego badanego przetwornika.
Keywords: rower elektryczny, napęd elektryczny, przełączalny silnik reluktancyjny, metoda elementów skończonych.
Electric vehicles are becoming a practical and convenient means of transport in busy urban agglomerations of the contemporary world. As the electric vehicles do not emit harmful exhaust fumes, their use does not contribute to air pollution or the global warming while additionally reducing acoustic noise [1,2,3]. The electric energy which powers the vehicle may come from renewable energy sources or use the kinetic energy recovered in the process of braking. However, one disadvantage of electric vehicles is their short range between charges . A solution to this problem may lie, among others, in the participation of countries in the creation of a modern infrastructure of electric vehicle charging stations. According to the Alternative Fuels Observatory, there currently are approximately 150 electric vehicle charging stations in Poland . Nowadays, a wide variety of electric bikes are available, ranging from those equipped with a small motor which is designed to merely assist the cyclist to those featuring a more potent power unit, forming an electric unit in the style of a moped . Three different concepts for the installation of electric motors to propel bikes are currently available on the market. The first variant is to integrate the motor with the chainset and the pedals. In this solution, power from the crankshaft is transmitted directly to the chain drive, and the central position of the motor makes it possible to maintain the correct centre of gravity in the bike. The second available and most common variant in serial production of electric bikes is a motor mounted in the front wheel hub. The third method for installing a motor in an electric bike is the rear wheel hub. This solution is similar to the one presented before; however, here the bike is more stable and may be used for off-road rides. In addition, the installation of the motor in the rear wheel provides better transmission of torque and enables the u [...]
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