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In modern transport industry there is a tendency for electric vehicles with independent power supply to increase their amount, particularly it seems to appear in the fast development of electric cars. Nevertheless, there are still some flaws in electric vehicle drives to be improved. The element of an electric drive that limits the performance of the vehicle is almost always power supply. Li-Ion accumulators,...
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...
Large high-voltage induction motors are widely used in industrial applications. Their accurate starting time is very much important for setting their over-current protective devices against heating and assessing power quality of distribution power system. In this paper, the starting time is accurately evaluated from a newly proposed technique that is employed to estimate electrical torque curve of...
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...
In this paper the issues of bearings' condition monitoring of induction motors having a squirrel-cage rotor is considered. Experimental results and their analysis are presented. The works were during the test of induction motor at rated nominal mode, with bearings: healthy and alternatively with two faults, which had defects inner and outer part of bearing frame.
This paper presents the topic of manufacturing the stator winding for small induction motors of aluminium instead of copper. The aspect of replacing the material is presented from the perspective of the producer. It is important to obtain a new motor with the same characteristics and the same energy efficiency while decreasing conductor material price and thus the price per motor unit. For these purpose...
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.
This paper presents a novel algorithm for in situ efficiency estimation for induction motors operating with distorted unbalanced voltages. The proposed technique utilizes the genetic algorithm, IEEE Form F2-Method F1 calculations, large motor test database and a new stray-load loss formula. The technique is evaluated by testing 3 small- and medium-sized induction motors with 11 different combinations...
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...
Dependence of stator current from slipping for induction motor powered by a pulsed voltage source was analyzed. Slipping dependence for higher harmonic components of induction motor from the fundamental and carrier signals frequency was considered. A method for calculating the stator current of the induction motor by a predetermined supply voltage was proposed.
Induction motor modeling using MATLAB package with aim of finding a most usable and simple compensation algorithm of asymmetry effect on the motor moment was conducted. The following ways was reviewed: insertion of back EMF in stator circuit with such magnitude, frequency and electrical angle that minimized stator negative-sequence current; rising stator impedance by external resistance insertion;...
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....
Qualitative characteristics of the electrical drive considerably depend on identification accuracy of math model parameters. In particular, it is depend on detection accuracy of stator active resistance π that is used in calculation of flux linkages, rotary speed in sensorless control systems. Paper provides analysis of influence of stator deep slot effect to stator active resistance value.
In order to separate study the steady-state characteristics of the induction motor when the resistance or inductance asymmetrical fault occurs in the stator winding, a set of differential equations are firstly respectively established to describe the characteristics of the motor under the condition of resistance and inductance asymmetrical fault in stator winding with the application of multi-loop...
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...
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