Abstract
ABSTRACTAs a prime driver, induction motor is the most electric energy consuming component in industry. The exposure of the motor to stator winding asymmetry, combined with broken rotor bar fault significantly increases the temperature and reduces the efficiency and life of the motor. Accurate and timely diagnosis of these faults will help to maintain motors operating under optimal status and avoid excessive energy consumption and severe damages to systems. This paper examines the performance of diagnosing the effect of asymmetry stator winding on broken rotor bar (BRB) faults under closed loop operation modes. It examines the effectiveness of conventional diagnostic features in both motor current and voltage signals using spectrum and modulation signal bispectrum analysis (MSBA). Evaluation results show that the combined faults cause an additional increase in the sideband amplitude and this increase in sideband can be observed in both the current and voltage signals under the sensorless control mode. MSB analysis has a good noise reduction capability and produces a more accurate and reliable diagnosis in that it gives a more correct indication of the fault severity and its location for all operating conditions.
Highlights
Induction motors are commonly mentioned as the workhorse of industries, mainly because of their simple yet powerful architectural construction, ergonomically adaptable structure, being rugged and highly robust and offering high value of reliability
This paper has shown the effectiveness of using both motor current and voltage signals for detection and diagnosis of motors faults compound between rotors and stators under sensorless control mode
The results show that the additional increase of the sidebands at 2sfs is due to the stator winding asymmetry that has an amplitude increase at 3f s and this increase in sidebands can be observed in both the current and voltage signals
Summary
Induction motors are commonly mentioned as the workhorse of industries, mainly because of their simple yet powerful architectural construction, ergonomically adaptable structure, being rugged and highly robust and offering high value of reliability. KEYWORDS Induction motor; stator winding asymmetry and broken rotor bar; variable speed drive (VSD); motor current and voltage signatures analysis
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