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In this paper a comparison of two different modelled permanent magnet synchronous machines will be shown. A simulation of a vehicle concept with both models will be described and investigated by means of an advanced simulation tool - the SmartElectricDrives (SED) Library - and a Modelica/Dymola simulation environment. The SED library provides the most important electric drive types including controlled electric machines which are described by algebraic and differential equations. Due to this kind of modelling, the machines provide higher flexibility in case of parameter variation and a more realistic behaviour. With the aim of achieving the highest efficiency possible for the automotive drive, which means finding an optimal setting regarding fuel and power consumption, it is necessary to simulate the entire drive train of the vehicle. This includes the internal combustion engine (ICE) as well as electric traction machines or additional electric auxiliary drives. These vehicle simulations may be performed by the car manufacturer to obtain specifications for the vehicle components to be constructed by fulfilling the given boundary conditions like electric machines speed, power and torque and therefore the resulting currents and voltages for the optimal dimensioning of each component.