DETECTION IMPROVEMENT OF THE BROKEN ROTOR BARS OF IM AFTER SUPPLY DISCONNECTION

Abdesselam Lebaroud - Amar Bentounsi

   This paper presents some analysis techniques of the voltages induced in the stator windings after supply disconnection, to detect broken rotor bars in induction motor (IM). When the motor is disconnected from the supply voltage, the broken bars cause a distortion of the magnetomotive force generated by rotor windings, and some particular harmonics induced in the stator windings increase their amplitude. The diagnostic technique is based on monitoring these voltage harmonics via the non parametric estimation of the modified periodogram and averaged periodogram. These techniques permit to evidence the principal harmonic frequencies of the signal and decrease the noise influence, thus allowing a better detection of the broken rotor bars.

Keywords: induction motor, detection, supply disconnection, broken bars

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