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A closed form solution is presented for the transient and steady-state response of surface permanent magnet synchronous machines to single FET short circuit failure in the drive. PWM techniques such as sine and discontinuous switching schemes are compared with respect to the motor performance under such fault condition. With the help of the analytic model the sensitivity of the key control parameters...
This paper presents a modeling of a surface permanent magnet synchronous motor in healthy and faulty cases and a control approach aiming at reducing the torque ripple which appears in faulty case. The fault considered in this work is a stator inter-turn short circuit. The model proposed in this paper is based on the dynamic equations of the motor. Simulation results show the possibility to reduce...
Multilevel inverters (MLI) are extensively used in various fields. Among the different multi level inverters Three-level neutral-point-clamped (NPC) inverter has been widely applied in power conversions at medium and high voltages. Its usage has been increasing in low-voltage low-power applications. The three-level inverters have the problems due to faulty switches. The effects on the system for short...
The harmonic distortions of motor currents can be mitigated by the application of the double-delta sourced winding (DDSW), which implements multi-level operation with two-level converters. In practice, dual winding induction machine (DWIM) has been considered for this application due to its inherent compatibility to DDSW. The modeling of DWIM is discussed for the vector control, and a decoupling control...
All types of electrical machines can be modeled by an equivalent two phase machine. For example a balanced three phase induction motor can be modeled as an equivalent two phase induction motor (The dq Model). In the same way an unbalanced induction motor can be modeled as an unbalanced two phase induction motor. This paper shows this concept by modeling a faulty induction motor with one of its three...
Aiming at the power device open and close faults occurred in the inverter, GUI based simulation platform for inverter drive system under fault condition is studied primarily in this dissertation. Using the S-function block of the MATLAB, the S function of the motor is written. The SIMULINK blocks of the inverter under different power device faults condition are built by the basic blocks of MATLAB/SIMULINK...
In this paper, the artificial neural network (ANN) inputs selection for detecting and quantifying the progressive value of an incipient defect in gears is carried out by experimental design evaluation. Several parameters in time-domain (root mean squared, crest factor, energy ratio, FM0, Kurtosis, FM4, NA4, M6A, NB4) and multiscale Hilbert-wavelet transformations are evaluated as a possible inputs...
This paper presents a study of the permanent magnet synchronous motor (PMSM) running under demagnetization. The simulation has been carried out by means of two dimensional (2-D) finite element analysis (FEA), and simulations results were compared with experimental results. The demagnetization fault is analyzed by means of decomposition of stator currents obtained at different speeds for torque change.
Multi-loop theory is the most common and effective method used for analyzing stator winding internal faults of synchronous generators. Based on the current analysis methods, this paper modifies the existing models and introduces the motion equation of rotor into the multi-loop analysis model to describe the associated relations between main parameters (e.g. current, voltage, torque, speed of rotation)...
The doubly salient permanent magnet (DSPM) motor is a novel type of AC brushless machine and it offers advantage of high power density, wide speed range and simple structure. To improve the reliability and fault-tolerant performance, a new dual-channel 12/8-pole DSPM motor speed-adjustable system is proposed in this paper. With the comprehensive introduction for the proposed redundant DSPM motor,...
Based on the multi-loop method, this paper analyzes and calculates the stator current, rotating torque and rotating speed of the induction machine, and the main work focuses on the fluctuating components of the torque and the speed caused by rotor winding faults. The conclusions of the analysis are as the follows: the rotor winding faults will cause stator current, electromagnetic torque and rotating...
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