An accurate inter-turn short circuit faults model dedicated to induction motors

Safety, disponibility and continuity of industrial systems are major issue in maintenance. In the last decades, these points are the important axes in the field of research. In fact, in many industrial processes research has picked up a fervent place and a particular importance in the area of fault diagnosis of electrical machines, in fact, a fault prognosis has become almost indispensable. The need of a mathematical model of three-phase induction machine, suitable for the simulation of machines behaviour under fault conditions, has received considerable attention. The paper presents a new practical and more precise model for induction motors after introducing inter turn short circuits faults. The proposed model is based on coupled magnetic circuit theory, capable to take into account any electrical asymmetry conditions. To verify the exactitude and the effectiveness of the model, simulation results for induction machine under interturn short circuit fault are presented. In spite of its simplicity, the proposed model is able to provide useful indications for diagnostic purposes. Experimental study is presented at the end of the paper to show that the proposed model predicts the induction machine behavior with a good accuracy

Steady State Analytical Study of Stator Current Harmonic Spectrum Components on Three-Phase Induction Motor under Unbalanced Supply Voltage

International audienceAlmost all induction motor applications suffer from unbalanced supply voltage. Under such conditions the motor operation can be seriously affected. Performance, control and monitoring are directly connected to the knowledge of the supply harmonics effects on the motor, therefore there is a real need to derive a general mathematical formula predicting the harmonics growth and to describe through an analytical analysis in steady state operation, the impact of unbalanced voltage supply on induction machine performance. In this paper an original analytical formula of harmonics components is developed to propose an accurate indicator of unbalanced supply voltage fault. The validity of this analytical study is confirmed by a comparison with simulation and experimental results. NOMENCLATURE  fundamental pulsation f frequency of the supply voltage (50HZ) sd V effective values of the supply voltages of the direct systems si V effective values of the supply voltages of inverse systems s s s R L   stator time constant r r r R L   rotor time constant r s L L M 2 1   leakage factor sa i Stator current   e  Real part of the quantity ed  Direct electromagnetic torque ei  Inverse electromagnetic torque e  pulsating electromagnetic torques

Study of the determination of the rational operating regime of percussion drilling machines

International audienceThe aim of presented research is to develop methods of determining the parameters of rational control of machine operation of percussion drilling during its operation in geological and mining conditions defined. To set the goal of empirical research, it is based on the literature search in which several researchers have studied the mode of percussion drilling with different methods based on the physic mechanical properties of the rock, setting parameters of the machine, geometric parameters of tool. The literature has shown us that there are now some methods of determining the dependencies of the drilling speed, and height of penetration is a function of the energy of a piston stroke and the drilling speed is a function of the height of penetration into the rock and the rotational speed, The analysis shows that these methods are based on knowledge of the peculiarities of the interaction of the tool against the rock. Each time, we take into account the parameters mentioned above. Keywords-Forces applied, properties of the rock, progress drilling, the height of penetration

HM-Based SMVC with Adaptive Feedforward Controller Applied to DC-DC Converter

International audienceThis paper aims to provide a comprehensive study of sliding mode controller (SMC) performance for closed-loop voltage control of DC-DC three-cells buck converter based on hysteresis modulation (HM) where an adaptive feedforward technique is adopted. To fix the switching frequency, the approach is to incorporate a feedforward adaptive scheme which is effectively a variant of SM control. Further, the use of an adaptive feedforward control that makes the hysteresis band variable in the hysteresis modulator of the SM controller to restrict the switching frequency variation feeding parameters uncertainties and loads disturbance, in order to overcome the design constraints and to mitigate the undesired transient response. The results obtained under load change, input change and reference change clearly demonstrates a great dynamic response of the proposed technique, as well as provide stability in any operating conditions, the effectiveness is fast with a smooth tracking of the desired output voltage. Simulations studies in MATLAB/Simulink environment have been performed to verify the concept

Marine Propulsion by the Injection of Compressed Air

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Stability analysis of the extended Kalman filter for Permanent Magnet Synchronous Motor

This paper presents a sensorless direct field oriented control fed interior permanent magnet synchronous motor (IPMSM) by using a known mathematical tool. The Kalman filter is an observer for linear and non-linear systems and is based on the stochastic intromission, in others words, noise. It is a question of studying the state and measurement noise covariance matrices Q and R on the stability of the Extended Kalman Filter. This last is used for the d, q stator current, mechanical speed, rotor position, stator resistance and the load torque estimation. The simulation tests carried out on Matlab Simulink showed that the matrix R improves much more quality of the estimated states while the matrix Q allows the improvement of the estimation process convergence

Stability analysis of the extended Kalman filter for Permanent Magnet Synchronous Motor Stability analysis of the extended Kalman filter for Permanent Magnet Synchronous Motor

International audienceThis paper presents a sensorless direct field oriented control fed interior permanent magnet synchronous motor (IPMSM) by using a known mathematical tool. The Kalman filter is an observer for linear and non-linear systems and is based on the stochastic intromission, in others words, noise. It is a question of studying the state and measurement noise covariance matrices Q and R on the stability of the Extended Kalman Filter. This last is used for the d, q stator current, mechanical speed, rotor position, stator resistance and the load torque estimation. The simulation tests carried out on Matlab Simulink showed that the matrix R improves much more quality of the estimated states while the matrix Q allows the improvement of the estimation process convergence. Keywords Permanent magnet synchronous machine Direct filed oriented control Extended Kalman filter Estimatio

Enhanced multiplex binary PIR localization using the Transferable Belief Model

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