Abstract

This paper aims to clarify the modulation effect of planetary gearbox with gear defects on stator current of three-phase induction machine. Although the spectral behavior, especially the location of fault-induced sidebands, has been analyzed in a few works, the actual modulation model of stator current under mechanical fault condition is still ambiguous. New ideas concerning amplitude and phase modulation is proposed to complete the modulation model, which facilities the fault diagnosis of planetary gearbox in real applications.

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