Abstract
Abstract This paper presents fault detection techniques, especially the motor current signature analysis (MCSA) which consists of the phase current measurement of the electrical motor’s stator and/or rotor. The motor current signature analysis consists in determining the frequency spectrum (FFT) of the stator current signal and evaluating the relative amplitude of the current harmonics. Sideband frequencies appear in the frequency spectrum of the current, corresponding to each fault. The broken bar is a frequent fault in induction motors with squirrel-cage rotor. It is presented the equivalent circuit for induction motors and the equivalence between the squirrel-cage rotor and the rotor windings. It is also presented an equivalent circuit model for induction motors with squirrel cage rotor, and based on this a Simulink model was developed. It is shown how a broken rotor bar influences the magnetic field around the rotor and through this the stator current. This modification is highlighted through the developed model.
Highlights
Induction motors are present in almost all equipments and the motor reliability influences the whole system working
The motor current signature analysis consists in determining the frequency spectrum (FFT) of the stator current signal and evaluating the relative amplitude of the current harmonics
Using the proper fault detection techniques the problems can be solved in time
Summary
Induction motors are present in almost all equipments and the motor reliability influences the whole system working. The sooner the faults are detected the better and faster one can intervene to solve the problem and reduce the losses This motivates the development of faster and more trustworthy maintenance and control techniques. The signal-based techniques use different measured frequencies which can be expressed through equations signals (vibration or current) using different sensors and require a good knowledge of the motor. Through these signals the electrical motor condition result in case of the high power motors under constant can be estimated. In this case it is required the load. The shutdown of the motor cannot be avoided, but shutdown time can be reduced and serious consequences
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