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Induction motors airgap-eccentricity fault detection has attracted the interest of many researchers in last decades. The Discrete Fourier Transform (DFT) has been widely used for that purpose. However, DFT can only give meaningful information for stationary signals. In this paper, an efficient time-domain technique based on a modified Prony's method for the airgap-eccentricity fault detection in induction...
The correct modeling and control of synchronous reluctance motors (SynRMs) requires a very good parameter identification. Accordingly, a simple experimental off-line approach for the calculation of the viscous friction coefficient, constant friction load, iron loss resistance and direct/quadrature inductances is presented in this paper. The iron loss resistance and the direct/quadrature inductances...
This paper deals with a new on-line diagnostic scheme based on the use of the stator instantaneous complex apparent impedance signature analysis for stator winding inter-turn short-circuit faults diagnosis and their discrimination from the supply-voltage unbalance effects in operating three-phase squirrel cage induction motors. Both simulation and experimental results are presented to demonstrate...
This paper presents a new diagnostic method based on the induction motor three-phase power analysis that is able to detect gear broken teeth. A gearbox mathematical model was developed to simulate the healthy and the broken tooth conditions. The simulation and experimental tests proved that the wavelet and spectrum analysis of the induction motor (IM) three-phase power are valuable techniques to diagnose...
This paper deals with a new independent parameter diagnostic scheme based on the use of the stator instantaneous complex apparent impedance signature analysis for rotor cage faults diagnosis and their discrimination from mechanical load torque oscillation effects in operating three-phase squirrel cage induction motors. Both simulation and experimental results are presented to demonstrate the effectiveness...
This paper presents the results of an experimental study on derating of an induction motor under different voltage unbalanced conditions and its comparison with the NEMA standard MG1 voltage unbalance derating graph. During the derating tests the 4 kW squirrel cage induction motor temperature rise was kept constant at the rated value and the windings temperature was measured on-line by means of an...
This paper presents a new fault diagnostic technique applied to switched reluctance motor (SRM) drives. A fault is detected when the measured amplitude of the DC bus current differs from its expected amplitude, assuming normal operating conditions. The information about phase currents amplitudes and the control states of all power switches permit to easily estimate the amplitude of the power converter...
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