FIELD: engines and pumps.
SUBSTANCE: method for diagnostics of short-circuit in power converter circuit of AC jet motor by bus current includes the following sequence of actions. Instantaneous current of the power converter bus of the AC jet motor is determined, wherein the mean value of the delta of the largest values of the wavelet decomposition coefficient corresponding to bus current at various scaling parameters is calculated and used as the value of the closing feature. The short circuit of the main switch circuit at the power converter portion of the AC jet motor is diagnosed using the mean value of the curve of delta of the largest values of the wavelet decomposition coefficient corresponding to the bus current of the power converter of the AC jet motor in the entire range of rotation speeds at different scaling parameters.
EFFECT: enhancement of diagnostics accuracy, expansion of functionality due to application for power converters of AC jet motor with the set of topological structures and any number of phases both with double switch and with common switch.
5 dwg
