In order to make the threephase permanent magnet faulttolerant motor still meet the requirements of the torque output after singlephase fault, a faulttolerant current optimization control method was proposed. For the opencircuit fault, based on the unchangeable principle of magnetic motive force, the faulttolerant compensation current was obtained, and the compensation of the torque ripple was achieved. For the shortcircuit fault, the torque ripple caused by short circuit current and the phase missing asymmetrical torque ripple were separately compensated by the strategy of separate compensation, and then the current vector synthesis was carried out to realize the minimization of the output torque ripple when the motor was short. The simulation experiment of MATLAB/Simulink was used to verify the effectiveness of faulttolerant control method.