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Vahid Rashtchi

Rashtchi Vahid; Aghmashe Reza; Ojaghi Mansor
Application of Duffing Oscillators to Dynamic Eccentricity Fault Detection in Squirrel Cage Induction Motors

Air gap eccentricity in a three-phase squirrel cage induction motor is one of the most  common faults that can make it necessary to remove the motor from the production line; thus, fault diagnosis in induction machines is gaining more attention. The development of motor drive systems with fault diagnostic and prediction features is of great concern and would help to avoid costly breakdowns. In this paper, a novel approach, based on chaos theory, is presented for detecting dynamic eccentricity. A chaotic oscillator called the Duffing oscillator is used for fault diagnosis. The presence of a fault is detected from a phase transition from chaotic motion to periodic motion in the Duffing oscillator phase plane. The method is tested on an eccentric motor under different loading conditions. Experimental results demonstrate the effectiveness of the proposed technique and the suitability of Duffing oscillators for diagnosing faults due to dynamic eccentricity



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