Abstarct: The superconductivity is in fact a state of a material with no electrical resistance in addition of some special magnetic behaviors when the material is cooled under a critical temperature. The superconductors can carry a rather large current density without loss, which is an important characteristic in many industrial applications. The superconducting wires and bulks are utilized in superconducting electrical machines to reduce the weight and size of the machine as well as improve the efficiency. These characteristics are very attractive in transportation industries and marine propulsion systems. In this thesis, a new structure of a superconducting synchronous motor is proposed for the first time. A new design algorithm is presented and a 2.5MW, 220rpm superconducting motor is designed. The performance of the new machine is analyzed in no-load and under-load conditions using finite elements method. The essential concepts of cooling system design are remarked. Furthermore, other problems such as improving the critical current of superconducting coils, possibility of coreless structure, and optimal design frequency selection are investigated. The overall evaluations authenticate the correctness of design algorithm and show that the proposed superconducting motor is a proper choice for marine propulsion.