With respect to material and production cost savings mod- ern synchronous machines designs are not based on sinusoi- dally distributed windings any more. So-called single tooth windings or bobbin windings are used more and more. In some cases these motors do not produce a circle shaped sta- tor admittance trajectory in the complex plane any more (like in Fig. 5 and Fig. 6) – these trajectories can show rather strange shapes (e. g. like a butterfly). As soon as there are several crossovers to the imaginary axis a simple tracking controller is not able any more to detect the orientation of the main flux by stator saturation effects.