Philip Dost and Constantinos Sourkounis
Harmonics, Hysteresis control, Pulse width modulation, Mechanical drive train, Flat top sine modulation, Bang bang control
The current developments for the energy supply of individual mobility are emerging electrical energy as an energy source for electric drives. Due to these developments there is a need of considering the conditioning of electrical energy to be used for electrical machines under conditions of an electric vehicle. Comparing a fixed step-size control-system with a hysteresis-control (bang-bang-control), the high frequent influence to the whole power train is evaluated with a view to the electrical and mechanical drive train. Furthermore the travelling comfort is a target of the study. As electrical drives for electric vehicles need to have a wide speed range and likewise be robust the chosen control processes are applied to a permanent magnetic synchronous machine (PMSM). This offers the opportunity of a gear-less drive. This by the way offers a big advantage in comparison to combustion engines. To connect the energy source to the PMSM an inverter is used. This builds three-phases for the machine and likewise a rectifier in the opposed direction to the battery. The Inverter is built with a set of IGBTs (Insulated Gate Bipolar Transistor) and integrated anti parallel diodes. The command signal is set by a torque demand, as known in a traditional car, with the help of an acceleration pedal. The mechanical part of the drive train is realized as a double oscillator as this represents the real mechanical drive train.
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