Modeling and Simulation of Vehicular Power Systems - webfiles its ...

6 Engine, electric machine and control systemmodeling6.1 Electric motorsThere are different types of electric motors which are commonly used in the drive train ofhybrid electric vehicles. Having a high efficiency compared to internal combustionengines, they have become good traction components in hybrid and electric vehicles. DCmotors, permanent magnet synchronous motors (PMSM) and switched reluctance motorshave been shown good performance to be used in vehicular applications [2]. Withintroduction of developed control methods like vector control they have become reallypopular in vehicle industry. So the modeling of electric motors is essential for a vehiclesimulation tool.Modeling of electric motors could be made in different forms. In some cases the behaviorof the motor is modeled by look-up tables collected from experimental tests on theefficiency maps of motor [2], [1], [7]. The typical efficiency map of an electric motor isgiven in different operating points in terms of speed and torque as shown in figure 6-1.Figure 6-1 Efficiency map of a typical PMSM37