Stator current-based sensorless vibration monitoring of induction motors

Mejorando un método de balanceo de rotores acoplados directamente a un motor de inducción utilizando la corriente residual

“…Figures 1 and 2 show some of the displays. Figure 1 shows the frequency spectrum with a harmonic component that is related to rotor imbalance as is obtained from the filtering process, as established by Riley [2]. In this case, the 4-pole induction motor runs at 60Hz.…”

“…These currents are produced by a deformation of the magnetic field in the motor air-gap, as a result of mechanical unbalance. However, the residual condition is also obtained by motor eccentricity, asymmetry of coil structure of stator and rotor, that is, owing to static and dynamic irregularities in the air-gap [2,5,8].…”

“…Riley et al [2] analyzed these relations to establish limits for the electric harmonics as they correlate with vibrations, concluding that there is a monotone relationship between both variables. Riley et al [3] finds, based on theoretical as well as on experimental bases, that there is a linear relationship between specific electric harmonics and mechanical vibration.…”