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This paper proposes a robust Passivity Based Control (PBC) strategy for an Externally Excited Synchronous Machine (EESM) used in high power applications. The mathematical model of the EESM is obtained in Euler-Lagrange (EL) formalism which is the basis for the PBC control design. Variations of parameters are modelled as external perturbations and are compensated by pre-control actions determined by disturbance observers. The reference current are calculated considering Maximum Torque Per Ampere (MTPA) and Field Weakening (FW) strategies. The proposed control structure is compared with a Field Oriented Control (FOC) algorithm based on PI current and speed controllers. Numerical simulations are carried out in Matlab-Simulink.