Diagnostic signs of induction motor broken rotor bars in electromotive force signal

摘要

A diagnostic coefficient, being the function of the average value of wavelet-decomposition coefficients sum for medium-frequency domain is proposed. A method for its decomposition with the use of the theory of reverse z-transform is worked out. The proposed method made it possible to specify diagnostic signs of IM broken rotor bars in the motor self-running-out mode and determine the degree of the rotor breakage.