Abstract
This paper investigates the modelling of a double star induction motor when this one operates under rotor fault. A special attention is paid only to the rotor defect. The use of double star induction motors or six-phase induction motors is increasing and we can find it in high power process. Its main advantage lies in most reliability in case of a normal operating system. In order to monitor a huge power process, we have to focus our attention on signals given the state of health of an electromechanical axis in the whole. Consequently, an appropriated model is proposed allowing the quantification of the severity of the fault when rotor bars are defected. This is made thanks to the most widespread approach: the spectral analysis of the stator current using the well know method named motor current signature analysis (MCSA)
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