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This paper deals with the detection and localization of electrical drives faults, especially those containing induction machines. First, the context of the study is presented and an Extended Kalman Filter is described for induction machines fault detection. Then the modeling procedure under faulty conditions is shown, and the machine diagnosis methods are developed. The proposed diagnosis approach...
Medium-and high-voltage induction motors are widely used in industrial applications. Estimations of their operating currents are very much required for assessment of their steady-state performances. This paper presents a new analytical approach to estimate motor's slip-current curve from their technical catalog data. An accuracy of the proposed technique is validated by comparing the slip-current...
This paper deals with the stability analysis of the well-known Adaptive Full-Order Observer for the speed estimation of induction motor drive in a motoring and regenerating mode, under motor parameter mismatch. The influence of the identification errors of the stator and rotor resistance and magnetizing inductance on unstable operating points regions of the estimator with the modified adaptation algorithm...
This paper deals with analysis of induction motor fed by non-harmonic voltage source. The losses are determined based on direct method for analysis of motor efficiency. The method is presented for fractional losses analysis with consideration harmonics generated by PMW. The introduced method earmarks the fundamental harmonic components of electrical magnitudes for comparison purposes of different...
This paper presents a dynamic induction motor (IM) model which incorporates all the power losses. The presented module is entirely built in Simulink to investigate the effect of varying the applied voltage and frequency on IM efficiency for different load applications. The model includes the power losses such as copper losses, core losses, stray load and mechanical. The accurate determination of induction...
This paper presented the design and implementation of an induction motor drive. In order to improve energy efficiency of this drive, system configuration comprised a single to three-phase converter with additional circuitry for PFC. In this design, using TI's UC3854 as the PFC controller chip, and the related parameters were designed. The control scheme was based on V/f control using two low-cost...
In the article, a new approach is considered, which is applying different test current to the motor, closed-loop regulation and making it reach a steady state, finally filtering calculation and getting all the parameters of the motor accurately. This method can run automatically before the induction motor vector controls. So it can improve the performance of vector control without increasing hardware...
The Linear parameter Varying and sliding mode observers are studied in this paper. Both the rotor resistance and speed variation are considered. The design of the considered observers is described in detail. In order to conduct a comparative study, the measurements used for both observers are assumed available on an equal basis. Equally, the same controllers parameters are used in simulation of a...
This paper deals with the online parameter estimation of squirrel-cage induction machines using the Gradient Descent Method and coupled stator and rotor flux observers. Stator resistance, rotor resistance and mutual inductance can be estimated simultaneously in real time. For a non-ambiguous parameter tracking, an additional voltage is superimposed. The influence of inverter nonlinearity, current...
A method for identification of induction motor parameters with the use of instantaneous power components balance equations is proposed in the paper. A dependence for nonlinear resistance in the rotor current function is obtained.
The effect of parametric variations in three phase induction motor such as stator resistance, rotor resistance, leakage and mutual inductances on the induction motor performance variables such as input power, output power, stator current, starting current, magnetizing current, power factor, efficiency, developed torque and starting torque have been analysed. A nonlinear polynomial of the induction...
The effect of inverter dead-time on the inverter output voltage is well studied in literature. This paper studies the effect of the dead-time on the inverter input current, and includes this effect in the dc link dynamic model of a diode-bridge-rectifier (DBR) fed voltage source inverter (VSI). Based on this study, this paper proposes a dynamic model of a rectifier-inverter-fed induction motor, that...
The main goal of this paper is to provide a novel method of parallel rotor resistance and rotor speed estimation for sensorless indirect field oriented controlled induction motor drive. In this scheme, a parallel model reference adaptive system (MRAS) is designed to simultaneous estimation of rotor speed and rotor resistance in order to achieve high-precise control in a wide range of motor speed....
This paper describes the design of a new algorithm for the rotor resistance adaptation. The obtained adaptive observer is used for the improvement of the vector control of induction motor (IM) drives. The adaptive observer detects the rotor speed and flux components in the stationary reference frame using the stator voltages and currents. Stability analysis based on Lyapunov theory is performed in...
An induction motor is the most widely used electric machine in high performance drive applications. This paper presents performance analysis of rotor speed estimation method using model reference adaptive control (MRAC) concept along with online estimation of machine parameters mainly stator resistance information requires especially at low speeds and online tuning of rotor time constant for high...
This paper presents the modeling, estimation and control of an induction motor. Starting with the linear approximation of the original nonlinear model of the motor, an on-line parameter estimation algorithm was developed. The algorithm deals with stator windings variations due to temperature oscillations. The resulted linear model was used, in order to control the rotor speed of the induction motor,...
Various MRAS-based estimation schemes of IM's rotor resistance has been proposed. Three simple rotor resistance identification methods of an induction motor drive are presented and compared. Two of the three techniques namely, electromagnetic torque equation, and reactive power equations are based on the generalization of existing methods. Authors proposed the third method, namely, active power equation...
This paper present the Field Programmable Gate Array (FPGA) realization of speed-sensorless Direct Vector Control (DVC) utilizing Extended Kalman Filter (EKF) with stator resistance estimation for Induction Motors (IMs). The EKF simultaneously estimates stator stationary axis components of stator currents and rotor fluxes, rotor angular velocity, load torque and stator resistance. The implemented...
Since the rotor resistance is associated with a slip calculation, the precise identification of rotor resistance has a crucial impact on the dynamic behavior of the whole Indirect Field Orientation Control. This paper presents a new technique based on Model Reference Adaptive System scheme for on-line estimation of an induction motor rotor resistance. The proposed rotor parameter identification is...
The performance of adaptive full order observer for speed sensorless induction motor drives can be improved further though it has been researched for many years. A novel speed estimation algorithm with estimated rotor flux error and the corresponding feedback gain design method are proposed in this paper. Through Lyapunov's theorem, the stability of proposed speed estimation algorithm is proved. The...
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