Influence of the inverter control-system to the mechanical and electrical behaviour of an electric vehicle modulated as a two-mass-system

The current developments for the energy supply of individual mobility are emerging electrical energy as an energy source for electric drives [1]. 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 [2]. Furthermore the travelling comfort is a target of the study [3]. 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 magnet excited synchronous machine (PMSM) [4], [5]. 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 [6], [7]. The mechanical part of the drive train is realized as a double oscillator as this represents the real mechanical drive train.