Disclosed is a method for diagnosing the detail coefficient standard deviation of a switch reluctance motor power converter failure, the method comprising: checking the phase current transient value of a switch reluctance motor power converter to calculate a detail coefficient standard deviation σ as a failure characteristic quantity; and employing the detail coefficient standard deviation σ curve of the phase current of the switch reluctance motor power converter in the entire rotational speed range or in the entire torque range to diagnose the short circuit failure of the master switch of the switch reluctance motor power converter. The present invention is suitable for a switch reluctance motor power converter having a multi-phase and multi-topology structure, can accurately diagnose short circuit failure, and has good engineering application value.
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