Detection and analysis of rotor faults in induction motors by the measurement of the stray magnetic flux

• Main Authors: M. Rigoni, N. Sadowski, N. J. Batistela, J.P. A. Bastos, S. L. Nau, A. Kost
• Format: Article
• Language: English
• Published: Sociedade Brasileira de Microondas e Optoeletrônica; Sociedade Brasileira de Eletromagnetismo
• Series: Journal of Microwaves, Optoelectronics and Electromagnetic Applications
• Subjects: Induction motor; Eccentricity; Finite element method; Broken bars; Magnetic field sensor
• Online Access: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S2179-10742012000100006&lng=en&tlng=en

This paper presents measured data and electromagnetic FEM field calculations as techniques for detecting and analyzing eccentricity in three-phase induction motors. Also it presents experimental results for detecting broken bars in induction motor rotors. A search-coil is used as magnetic field sensor to measure the stray magnetic flux outside the motor. It is a totally non-invasive method.