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A Study of the Impact of Squirrel-Cage Rotor Faults on the Stator Current Signature

Maik Jurgen Streblau, Marin Todorov, Tatyana Dimova

Abstract: The present paper considers the impact of the degree of damage to a squirrel-cage rotor of an induction motor on the spectrum of the stator current. The study is based on the motor current signature analysis. Performed, for this purpose, were scientific experiments on eight samples of squirrel-cage rotors, seven of which with pre-inflicted faults using Dynamic Motor Analyser. The obtained results are herein presented in graphical and tabular form and are further compared with the ones acquired from an induction motor with an intact rotor winding. It can be clearly ascertained that the larger the number of damaged rotor bars, the more significant the increase in the current amplitude as correspondent to the side band amplitude.
Keywords: amplitude / squirrel cage rotors / induction / Faults / current

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