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Öğe Investigation of Negative sequence Components for Stator Shorted Turn Detection in Induction Motors(Ieee, 2010) Bakhri, S.; Ertugrul, N.; Soong, W. L.; Arkan, M.Online diagnostics is prefered specifically in critical induction machines for timely analysis of there health and to predict any incipient failures. For early fault detection, the negative sequence current component can offer a fast and reliable monitoring technique. However, the negative sequence component method contains inherent non-idealities (such as inherent machine asymmetries) and is sensitive to external effects (such as load change and supply voltage imbalnces). This paper address these limitations while considering real system disturbances and non-linearities using a dynamic motor model effectiveness of the nagative sequence component analysis as well as the behavior of the model under load change and voltage unbalance was discussed. The nagative sequence components due to stator faults and the interaction with voltage and load variation were also presented in the paper.Öğe A New Method to Separate Broken Rotor Failures and Low Frequency Load Oscillations in Three-Phase Induction Motor(Ieee, 2013) Goktas, T.; Arkan, M.; Ozguven, O. F.For a time-varying loads, the presence of load fluctuation may sometimes have the same effect as broken rotor failure in a stator current of induction motors. In recent years, many methods, which are used to distinguish these two effects, have been published. In this study, a new method, which is based on Analytical Signal Angular Fluctuation (ASAF) signal, is developed to separate effects of load oscillation from broken rotor bar, especially when load oscillation is close to twice slip frequency. The simulation results are presented for the proposed method to show that, discerning broken rotor bar faults from low frequency load oscillation is possible. The developed method is independent of motor parameters.Öğe Performance enhancement of single-phase induction motor using GA based multi-objective Optimisation(Taylor & Francis Ltd, 2022) Bin Younas, M.; Khalid, H. A.; Javed, Adeel; Yetis, H.; Goktas, T.; Arkan, M.Single-phase induction motors (SPIMs) are commonly used in domestic and industrial applications because of their robustness, low power rating, and simple input power requirement. Due to their widespread application, the dynamic performance and efficiency at the operating point have become vital to ensure energy conservation. This paper is aimed to optimise both the dynamic performance and efficiency of SPIM for water pump application at rated speed. Multi-objective optimisation is performed by employing the genetic algorithm using a Maxwell-2D transient solver. The analysis presents the comparison between the optimised and basic motor designs while considering various manufacturing constraints. The study proposes a framework for performance enhancement of SPIM while verifying the optimal solution through sensitivity analysis. The obtained results show the high performance of optimised SPIM design with a 17% increase in efficiency compared to the basic motor.Öğe Sensorless speed estimation in induction motor drives by using the space vector angular fluctuation signal(Inst Engineering Technology-Iet, 2008) Arkan, M.A sensorless speed estimation method for real-time application in induction motor drives under steady-state condition is proposed. Speed harmonic component in the space vector angular fluctuation (SVAF) signal, which is caused by both dynamic and static eccentricity, is used for speed estimation. The SVAF signal is obtained from the stator currents of the induction motor. The extraction of speed information using digital signal processing techniques is considered. Experimental results are given to demonstrate the validity of the speed estimation method on an induction motor driven by an inverter.
