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This paper proposes a fault diagnosis method for an open-fault in inverter driving five-phase induction motor. The five-phase

induction motor has a high output torque and small torque ripple in comparison to three-phase. The best advantage of the five-

phase induction motor is fault diagnosis and tolerant control using redundancy of phases. This paper uses an inverter as a power

converter for driving a five-phase induction motor. If a switch of inverter occurs to the open-fault, this problem is the influence on

the output current and output torque. To solve this problem, there is need of and accurate diagnosis and fault switch distinction.

Therefore, this paper propose a fault detection method of the open-fault switches for the fault diagnosis. First, analyzing the pattern

for the open-circuit fault of one phase. Next, analyzing the pattern for the open-circuit fault of each inverter switches. Through the

pattern analysis, it defines the scope of each of the failure switch. Thereafter, By using an algorithm that proposes to perform a fault

diagnosis method. The proposed algorithm is verified from the experiment with the 1.5 kW five-phase induction motor.