The main disadvantages of currently available electric vehicles can be overcome by integrating range extenders in short range electric vehicles. Peec-Power is developing a new prototype range extender, integrating combustion engine and generator. For this purpose a generator had to be developed. The generator constructions best suited for this range extender application are discussed. Of these generator constructions models have been derived. The resulting designs will be presented along with a comparison of the analytical calculation results and finite element method (FEM) calculation results.