Detection of Induction Motor Stator Winding and Unbalance Faults Using Hybrid Methods

摘要

This paper presents the results of a study aimed at the defection of three phase induction motor stator winding and unbalance faults using experimental techniques. Unlike broken rotor bar and rolling element bearing faults, a stator winding fault docs not have well-defined fault frequencies in the vibration, acoustic or stator winding current spectra. On the other hand, an unbalance fault may yield vibration spectral harmonics that are similar to other faults. For these reasons it is sometimes difficult to detect and diagnose these faults by using only one monitoring scheme. To obtain the generic characteristics of these motor faults this paper employs a combination of vibration, stator current and acoustic methods. This enables us to investigate motor faults from different perspectives in an effort to derive effective condition monitoring methods. Simulated motor fault experiments were conduced in a laboratory environment under different speed and load conditions. Experimental results suggest that particular spectral harmonics from measurements are sensitive to different motor faults. For the purpose of induction motor condition monitoring, hybrid methods are highly recommended in order to obtain accurate monitoring results.