FAULTS DETECTION OF INDUCTION MACHINES BY RADIAL FIELD MEASUREMENT

Driss Belkhayat - Raphaël Romary - Mustapha El Adnani - Rodolphe Corton - Jean François Brudny

   In this paper, the authors propose a diagnosis method based on the measurement of the radial magnetic field in the surrounding area of an induction machine. Considering a star coupled induction machine, the effect of broken rotor bar fault or a stator phase cutting fault on stator currents and radial field spectrum is analyzed as an illustration of this diagnosis method. When the saturation is taken into account, the study shows that the fault causes the circulation of a third harmonic current between the two fed phases. This harmonic current generates new spectrum lines in the air gap flux density linked to the slotting effect. These high frequency components are easily detectable by the radial field measurement.

Keywords: induction machine, diagnosis, radial magnetic field, slotting effect, flux density components

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