A sizing comparison among Axial Flux Permanent Magnet (AFPM) motors is presented. The adopted procedure, implementing traditional sizing equations, is simple and quick; it is aimed to reduce the free design parameters, in a basic parametric analysis, to obtain an improved design. The procedure, already applied to the design of wind energy AFPM Synchronous Generators, is used here to size an AFPM Synchronous Motor (SM) for automotive application: the rotor disposition is a single stage Axial Flux Interior Rotor (AFIR) structure, also called Kaman type machine; the two stators consist of a laminated core with concentrated coil windings.