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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...
This work is part of the monitoring and diagnosis of defects of the squirrel cage asynchronous machine, in particular the defect of rotor bar breaks. The design of a system for monitoring, detecting and locating faults from births for different loads of the machine is achieved by the use of advanced intelligent techniques based on neural networks; ANFIS-based neuro-fuzzy network whose knowledge base...
The failure rate of rotor bars is high, which causes large area of broken conducting bars, shortening the lifetime of motors. Therefore, the diagnosis of broken rotor fault diagnosis is of great importance. First, the mathematical model of induction motors is presented, and the internal and external magnetic field boundary conditions are defined. Second, frequency domain analysis method is combined...
Rotor winding interturn short circuit is the main fault of synchronous electric machines, it is of great significance to the safe and stable operation of the machine to discover and handle the fault timely. In view of this, the fault positioning method of rotor turn-to-turn short circuit of synchronous machines was studied. The mathematic expression of exciting magnetomotive force (e-m.m.f.), electromotiveforce...
In this paper the demagnetization faults that occur in a axial flux permanent magnet (AFPM) synchronous machine using 3D finite element method (FEM) are studied. Two different generator topologies, a single rotor and a double rotor coreless topology, are simulated. The harmonic components of the spectrum of the back-emf and the stator current waveforms are calculated and the fault indicator harmonics...
A line-to-line short circuit fault of a stator is one of come faults in the real working process of single cage induction motors. Therefore, studying the electromagnetic field and electromagnetic force after faults is of great importance. In this paper, the transient mathematical theory model of the line-to-line faults of squirrel cage induction motors was presented, and the two dimensional field...
Broken rotor bar fault in induction motors significantly affects the motor dynamic performance and increases the mechanical oscillations in torque and speed. Motor current signature analysis has widely been used to detect such fault, yet it has some shortcomings due to motor topology, stator winding and load type dependencies. In this paper, radial leakage flux which contains most critical fault related...
Electrical signature analysis (ESA) has been increasingly used in condition-based maintenance programs of synchronous generators. The fault diagnosis is based on the analysis of failure patterns in the current or voltage signatures, which allow to distinguish possible incipient faults in the machine. The failure patterns are usually dependent on the line frequency, rotor rotation frequency and some...
Inter-turn insulation failure in induction motor results in complete or developing winding short circuit. Stator winding fault leads to an unbalance in the three phases of the motor leading to a faulty induction motor with increased time and space harmonics of flux. This can lead to uneven distribution of air gap flux and increase in torque ripple. The condition is worsened due to an unbalance in...
This paper suggests a distinct method having advantages over classical MCSA and Stray flux analysis techniques. The radial flux sensing coil (RFSC) proposed in this study provides the wanted ease of stator turn fault (STF) detection and simplicity of implementation. The RFSC has been found to be more effective compared to external flux sensors and current sensors for detection of unbalanced source...
Recently, research concerning condition monitoring and fault diagnosis of electrical machines have experienced extraordinarily dynamic activity. The increasing importance of these energy conversion devices and their widespread use in uncountable applications have motivated significant research efforts. Various faults are occurring in the stator as well as in the rotor of 3-phase squirrel cage induction...
Recently, research concerning condition monitoring and fault diagnosis of electrical machines. The increasing importance of these energy conversion devices and their widespread use in uncountable applications has motivated significant research efforts. Various faults are occurring in the stator as well as in the rotor of 3-phase squirrel cage induction motor such as bearing fault, broken rotor bar...
The bearing fault has a significant percentage to the electric machines, why a study in this setting is needed. The modified winding function approach theory (MWFA) is often used to model this fault. The influence of load and slip were studied even checking the corresponding measures proposed by the literature formulas of the characteristic frequencies. Both types of bearing defects must be processed...
This paper analyzes the feasibility of using the existing auxiliary winding in wound field brushless synchronous generator for condition monitoring. The auxiliary winding is the 4th winding placed in the stator of a three phase synchronous generator to feed exciter field through the automatic voltage regulator. This paper presents the model of a wound field synchronous generator with stator winding...
This paper deals with modeling and analysis of broken magnet fault signatures in permanent magnet surface mounted (PMSM) motor variables. A detailed mathematical analysis based on the linear model of PMSM motor is developed to predict the behavior of different fault signatures in stator current and back-emf for various motor operation points. In order to verify the results, a three phase, 8-pole PMSM...
This paper presents a stator inter-turn fault detection approach for the inverter-fed induction motor (IM) based on the Teager-Kaiser energy operation (TKEO). The zero sequence voltage under the excitation of the inverter switching harmonics is analyzed, and the characteristic frequencies of the inter-turn fault in the inverter common-mode voltage (CMV) is derived. In this way, the monitoring sensitivity...
Often encountered driving critical applications, synchronous machines (SM) require reliable condition monitoring systems. In this paper, the advantages of using the field winding current of a synchronous motor as an early indicator of machine faults are demonstrated. Analysis is carried out, both through simulation, via the use of finite element methods (FEM), and through experimentation, using a...
Condition monitoring of permanent magnet synchronous motors (PMSMs) is the process that identifies and averts impending faults and is of critical importance for reliability and robustness of overall system. In this study, magnet defect fault in PMSMs and the consequence effects of such failure on stator back-emf and current wave forms are investigated through modified magnetic equivalent circuit (MEC)...
This paper proposes a stator winding fault diagnosis for interior permanent magnet (PM) machines based on the pulsating-type voltage injection. By superimposing a pulsating voltage on d-axis with respect to the rotor-referred synchronous frame, measurable winding fault reflected signals occur in the injection induced current ripples. Comparing to prior diagnostic techniques, the proposed injection...
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