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In order to build the stator winding fault model of the asynchronous motor in the highspeed train system, anew state-space representation of the dynamic equations by using the Park’s vector method is proposed. Compared with the flux linkage variable, the stator current as state variables is chosen to determine the stator current and diagnose the stator fault timely, which is important in the high-speed train. The simulation results prove the effectiveness of the approach.