Analytical and Experimental Study of Gearbox Mechanical Effect on the Induction Machine Stator Current Signature

The aim of this paper is the analytical and experimental study of a gearbox by using the stator current signature analysis in the driving induction machines. The mechanical study using the vibration signal analysis has been well studied before. Recently, some works have been performed to observe the vibration components of the mechanical part in the stator current spectrum for an induction machine but without any theoretical development. This paper proposes a theoretical framework based on torque oscillations due to the characteristic torsional vibrations in a gearbox, and the source of mesh and rotating frequency components in the stator current is presented. To verify the theoretical development, a test bed based on a 5.5-kW three-phase squirrel-cage machine connected to a gearbox has been used.