Patent ID: 9618583
Date: 2017-04-11
CPC Classifications: G01R,H02H

Claim:
1. A method for detecting faults during a steady state of an operation of an induction motor, comprising: measuring, in a time domain, a signal of a current powering the induction motor with a fundamental frequency; determining, in a frequency domain, a set of frequencies with non-zero amplitudes, such that a reconstructed signal formed by the set of frequencies with non-zero amplitudes approximates the signal measured in the time domain, wherein the determining includes a compressive sensing via searching within a subband including the fundamental frequency of the signal subject to condition of a sparsity of the signal in the frequency domain; detecting a fault in the induction motor if the set of frequencies includes a fault frequency different from the fundamental frequency; and determining a type of the fault based on an amplitude of the fault frequency, wherein the type includes one or combination of a partial broken bar and a number of broken bars, wherein the type of the fault is the partial broken bar if the amplitude of the fault frequency is less than a threshold, wherein steps of the method are performed by a processor.