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This paper proposes a real time scalar control of induction motor by using RT-LAB software. This method of control leads to be able to adjust the speed of the motor by control the frequency and stator voltage magnitude, the ratio of stator voltage magnitude to frequency should be kept constant, which is called as scalar control of induction motor. The real-time scalar control algorithm is designed...
The aim of the present paper is to diagnose the mechanical faults in induction motors. We have chosen this part in order to contribute to the diagnosis of electrical machines. The raising of stator current allows detecting the fatigue of the machine failure. The manner of the treatment decides the efficiency of the applied technique. We have examined the static eccentricity fault by a vibration signal...
This paper presents a new precise vision to diagnose the eccentricity fault using the motor current signature analysis technique (MCSA). The MCSA method was based on analyzing the FFT of the stator current. But, it has many disadvantages, as operating regimes (non-stationary) or his suffering to distingue the characteristic frequencies of several faults such as short circuit, eccentricity, broken...
The present paper presents the fault detection of eccentricity using a new qualitative (and quantitative) analysis which based on discrete wavelet transform (DWT) technique. DWT method was based on analyzing the stator current. DWT coefficients of the stator current in a particular frequency band are calculated and analyzed. We used the wavelet mother of Daubechies to analyze the stator current under...
This paper deals with the implementation of a Maximum Constant Boost Control (MCBC) for a 9-Switch z-source power inverter supplying two induction motors. This topology allows greatly reducing the number of power switches, the switching-losses, the volume, and therefore the system cost. In Electric Vehicle (EV) application, a 9-switch power inverter requires a DC-DC converter to boost batteries output...
Impact of electric transformer impedance on squirrel-cage induction motor (SCIM) behavior, namely torque peaks and loss of speed, during symmetrical and unsymmetrical voltage sags is qualitatively analyzed on three-phase SCIM in this paper. These effects depend on several variables like sag type, duration and depth. The presence of transformer impedance always results in torque peaks higher than when...
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