A bus current-based short circuit fault diagnosing method for the power converter of a switched reluctance motor, which, by detecting the transient value of bus current in the power converter of a switched reluctance motor, calculates the mean value Δ of maximum wavelet transform coefficient corresponding to bus current under different scale parameters and takes the mean value as a fault characteristic quantity, and utilizes a curve of mean value Δ of maximum wavelet transform coefficient corresponding to bus current in the power converter of the switched reluctance motor under different scale parameters in the entire range of rotation speed to diagnose whether there is a short circuit fault in the position main switches of the power converter of the switched reluctance motor. The method is applicable to the diagnosis of short circuit faults in position main switches of the power converter of a switched reluctance motor in any topological structure with any number of phases, can diagnose short circuit faults accurately, and has a great value in engineering application.
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