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This invention discloses a highly generalizable method for diagnosing open-circuit faults in multi-transistor converters of motor drive systems. This method addresses open-circuit faults in power devices caused by overcurrent surges, poor heat dissipation, and other factors, preventing damage to the motor and power grid equipment caused by output current distortion and increased torque ripple. The method analyzes the retention characteristics of the positive and negative regions of the three-phase stator current under steady-state operating conditions to construct a fault location function, and combines auxiliary variables to accurately distinguish between single-power and dual-power device open-circuit faults. This invention enables rapid location and accurate identification of complex open-circuit faults such as those in opposite phases on the same side or in opposite phases on opposite sides. It offers advantages such as high diagnostic accuracy, strong ability to distinguish mixed faults, and non-invasiveness, making it suitable for motor drive systems with high requirements for operational reliability and fault tolerance.