Abstract
The aim of this paper is to analyze theoretically and experimentally the stator current of a three-phase squirrel cage induction machine in order to show how it is influenced by rotor faults. The approach used for this study analyzes the modification introduced by n broken rotor bars in the rotor cage magnetomotive force (MMF) and then, estimates the resulting frequency spectrum in the stator current. This approach is validated in a 3 kW-230 V/400 V-50 Hz-2850 rpm-2 poles three-phase induction machine, showing the sensible frequency components to this fault condition.
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