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In this study, a diagnostic method to identify the misplacement angle of a Hall-effect position sensor in brushless DC motor drives is presented. The proposed method is based on a single signal measurement, deployed on a Fuzzy Inference System (FIS), and can be implemented on a micro-processor for near real-time diagnosis of the unbalanced positioning of a sensor. The designed FIS was evaluated in...
In this study, a diagnostic method to identify potential faults of Hall-effect sensors in brushless DC (BLDC) motor drives is proposed. The wavelet signal theory is evaluated as an alternative diagnostic method, able to identify either a breakdown or a misplacement of a position sensor. The proposed method combines the required noise insensitivity with the measurement of a single signal. Since the...
This paper introduces an improved signal processing technique of zero sequence voltage (ZSV) with the scope of position sensorless commutation of a BLDC motor drive system. Rotor position information is extracted in the proposed technique from ZSV. This signal includes all time intervals where back electromagnetic force (EMF) zero crossings (ZCs) occur, from which the commutation instants are determined...
Stress is physiological and physical reaction that appears in highly demanding situations and affects human's perception and reaction capability. Occurrence of stress events within highly dynamic road environment could lead to life-threatening situation. With the perspective of safety and comfort driving provision to anxious drivers, in this paper a stress-oriented Driver Assistance System (DAS) is...
The exploitation of wavelet theory in a control structure of a Brushless DC (BLDC) motor integrated in a Fuel Cell Electric Vehicle is proposed. The controlling structure, consisted of two interrelated multiresolution PID (MRPID) controllers, regulates: a) BLDC motor torque through DC current and b) rotor speed. The proposed structure is deployed on an algorithm that exploits inherit wavelet filtering...
In this paper an investigation of the Doubly-Fed Induction Generator's start-up procedure, using zero crossing method for the grid voltage's angle's calculation, is carried out in the environment of Matlab/ Simulink. Moreover, the significance of the phase displacement and the amplitude deviation of the stator voltage in the system's synchronization procedure is highlighted via simulation.
The main objective of this paper is to investigate the behaviour of Doubly-Fed Induction Generator (DFIG) under various grid disturbances. In order to study the dynamic response of DFIG, to emerge the faults' consequences, a model has been simulated in Matlab/Simulink. In addition, FFT analysis has been done to achieve fault diagnosis and identification. The disturbances that have been investigated...
In this work, a sensorless commutation technique for the operation of a BLDC motor drive system is proposed. The idea is to derive back electromagnetic force zero crossings from two motor terminal voltages in respect to a virtual neutral potential. The commutation instances can be properly defined via a 30° electrical degrees phase shift of the correspondent back EMF zero crossing point in each motor...
In this paper, the wind energy conversion system that uses the “Cascade technology” especially the structure of Doubly-Fed Induction Generator (DFIG) is presented and analyzed. Moreover, a simulation of this wind energy conversion system in MATLAB/SIMULINK under different wind speeds is done and the results are presented and evaluated. Furthermore, a simulation under faulty conditions is held. More...
In this paper, the wind energy conversion system that uses the structure of Doubly-Fed Induction Generator (DFIG) under fault condition is presented. Moreover, a simulation of this wind energy conversion system under fault conditions in MATLAB/ SIMULINK is done and the results are evaluated. Two typical cases of fault, open-circuit faults in two IGBTs in Rotor Side Converter and in one diode in Grid...
In this paper, a wind energy conversion system that uses the “Cascade technology” especially the structure of Doubly-Fed Induction Generator (DFIG) is presented and analyzed. Moreover, a simulation of this wind energy conversion system under fault conditions in MATLAB/ SIMULINK is done and the results are evaluated. Open-circuit faults in one IGBT or in two IGBTs are studied.
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