The flux-barrier rotor is generally agreed to be the optimum topology for SynRM, where design parametrization rules are exhaustive. However, in a specific case where a small diameter of 25.24mm is required, the small number of stator slots and diameter limitation results in a parametrized design with a smaller number of flux barriers. This results in a lower saliency ratio. Design with 2 or more flux barriers must be excluded in this small dimension constraint due to the manufacturing feasibility of small fine blanking. This study evaluates if the conventional parametrization rules for flux-barrier SynRM design is applicable in this condition. 4 alternatives of rotor topologies were proposed and analyzed using FE analysis. The rotors proposed include an innovative segmented rotor as an alternative to the conventional flux-barrier rotors. The results show that the segmented rotor has the highest saliency ratio at 2.07 and a torque density of 2.2e-5 which is comparable to SynRMs in recent literature. It produces a torque of 0.78 Nm, an efficiency of 45.75%, and a power factor of 0.63 at 5000rpm and 50A. The mechanical stress and deformation of the rotor structure are also at an acceptable value of 6.2e5 N/mm 2 and 5.5e-5 mm.