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This paper presents a new method of simultaneous estimation of speed and rotor resistance of an induction motor, from a sensorless vector control system. The simultaneous estimation of the speed, rotor flux and of rotor resistance is done by using an adaptive estimator, called the COS observer. To ensure the persistent excitation condition, in the vector control system, over the rotor flux reference,...
Energy balance of electromechanical converter of a multi-module structure with a common hollow massive rotor has been considered. Design capacity for the motor module is chosen based on the sum of thermal and mechanical output. For the brake module operating in the mode of opposition circuit only thermal mechanical output can be chosen. These capacities are determined by preliminary thermal and hydrodynamic...
On Multiple-Motor systems fed by Multiple-Converter systems a set of electric motor drives share the load through a common mechanical coupling. Such a coupling is exploited in this paper to realize a sensorless field oriented control, based on a quite common back-emf technique to estimate the rotor flux angular position and an original approach to correct the estimation errors. The technique is based...
An adaptive sliding-mode observer is proposed in this paper to update the rotor resistance in indirect field oriented controlled induction motor drives. Although the observer is implemented in stationary reference frame, the design and theory analysis are made in the rotor-field oriented reference frame. Through coordinate transformation, the essence of the sliding- mode manifold and the theory foundation...
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...
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 investigation of the Extended Kalman Filter (EKF) for sensorless indirect vector control of an induction motor. The prime focus is low speed operation, when the EKF somewhat presents erroneous results. The effectiveness of the EKF as a speed estimator under machine parameter variations - change in stator resistance, rotor resistance is assessed. Furthermore, the effect of...
Particle swarm optimization (PSO) technique has been integrated with sensorless field oriented control induction motor (FOC IM) drive system to identify its optimal parameters. The proposed PSO algorithm is run in parallel with sensorless FOC IM drive taking the stator current as input to estimate both electrical and mechanical parameters. Such parameters are stator resistance, rotor resistance, rotor...
In this paper, a sensorless output feedback controller is designed and developed for the Induction Motor (IM), without using of flux and speed sensors. Firstly, a new sliding mode observer that uses only the measured stator currents is synthesized to estimate the speed, the flux and the load torque. Secondly, a backstepping control is developed so as to steer the estimated speed and flux magnitude...
In this study, load sharing in tandem connected wound rotor induction motors and the effect of change in rotor resistance on load sharing were investigated. A mathematical model for a single motor was developed in MATLAB/Simulink. Then this model was doubled for two motors where the shaft speed feed-back is the same. Motors can be identical or different. The combined model and individual models are...
This paper presents the design and development of an in-wheel brushless DC (BLDC) motor test-bed, the BLDC motor alteration to introduce different electric fault scenarios is described. The BLDC motor was rewinded to introduce short-circuit and open-circuit stator faults.
In this work, parameters of the equivalent circuit of a small induction motor with gearbox are experimentally extracted using standardized tests. Such parameters are used to formulate the nonlinear dynamic model of the motor in the d-q frame. To demonstrate the validity of the resulting model, a nonlinear multivariable sliding mode controller that uses the extracted parameters in its formulation is...
Inverter driven motor systems have seen wider use in industry as energy reduction methods. Studies have been undertaken previously to understand the effects of voltage imbalances on motor efficiency and deratings. However, this has not been covered in much detail on inverter-driven motor systems. This paper aims to study the effect that motor stator resistance imbalances have on motor efficiency when...
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.
Based on rotor slot harmonics theory in the Georgia Institute of Technology, this paper proposed to develop a sensor-less temperature estimation method for electrical submersible motor(ESM). This work can realize the demand for the real-time temperature monitoring of ESM worked in the underground 2km deep. To obtain the effective message of slot harmonics, the stator current has been analyzed and...
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...
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