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In this paper, the performance analysis of a 10 MW class high temperature superconducting (HTS) synchronous generator for wind turbines applications is discussed. The proposed generator using HTS excitation field winding is modeled and simulated under full load condition. Also, the losses of the generator especially iron losses and copper losses using analytical and finite element method (FEM) calculations are evaluated. Also, the stator back yoke height according to optimum value of the generator losses and weight through sensitivity analysis are optimized. Consequently, the electrical efficiency of the wind turbine generator is calculated and the superiority of the proposed 10 MW class HTS generator will be concluded.