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This paper deals with optimum design criteria for maximum torque density and minimum torque ripple of a flux switching motor (FSM) using response surface methodology (RSM) and finite element method (FEM). The focus of this paper is to find a design solution through the comparison of torque density and torque ripple according to rotor shape variations. Then, a new type winding method and optimum turns of armature/field winding are introduced, and numerical analysis and experiment are conducted to confirm the appropriate solution for the optimized model. The proposed procedure allows the definition of the optimum rotor dimensions and armature/field turns starting from an existing motor or a preliminary design.