A comparative study for the performance operation of electric machine based on conventional and D-Q theories (original) (raw)
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IARJSET, 2020
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Widely used in many industrial applications, the induction motors represent the starting point when an electrical drive system has to be designed. In modern control theory, the induction motor is described by different mathematical models, according to the employed control method. In the symmetrical three-phase version or in the unsymmetrical two-phase version, this electrical motor type can be associated with vector control strategy. Through this control method, the induction motor operation can be analysed in a similar way to a DC motor. The goal of this research is to summarize the existing models and to develop new models, in order to obtain a unified approach on modelling of the induction machines for vector control purposes. Starting from vector control principles, the work suggests the d-q axes unified approach for all types of the induction motors. However, the space vector analysis is presented as a strong tool in modelling of the symmetrical induction machines. When an electrical motor is viewed as a mathematical system, with inputs and outputs, it can be analysed and described in multiple ways, considering different reference frames and state-space variables. All the mathematical possible models are illustrated in this report. The suggestions for what model is suitable for what application, are defined as well. As the practical implementation of the vector control strategies require digital signal processors (DSP), from the continuos time domain models are derived the discrete time domain models. The discrete models permit the implementation of the mathematical model of the induction motors, in order to obtain high efficiency sensorless drives. The stability of these various models is analysed.
DQ Modeling and Dynamic Characteristics of a Three-Phase Induction Machine
AC motors as a drive have become more popular over its DC motors counterpart (For example Ward Leonard System) in the variable speed drives applications. The latter uses three electrical rotating machines and very costly to maintain despite the low efficiency offered by them. The former offers superior dynamic performance. In this paper, the theory of reference frames is used to examine the dynamic performance of the induction machine. The reference frame considered is synchronously rotating DQ-reference frame. This is because this reference frame transforms the AC signals to the equivalent DC signals. The dynamic model provides detailed expressions for the study of transient and steady state behaviors of the machine. 4 th Order Runge-Kutta (ode45) was used to solve the differential equations using MATLAB. Results shows that MATLAB a reliable and sophisticated tool to study the transient and steady state response of the machine.
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Ijca Proceedings on National Conference on Innovative Paradigms in Engineering Technology 2013, 2013
This paper presents the qd and voltage-behind reactance model of three phase induction motor. The accurate behavioral modeling of induction motor helps in designing controller for the machine and is also useful in detection of faults in machines. The rotor subsystem is expressed in qd coordinates and the stator subsystem is expressed in abc phase coordinates. Computer studies of an induction motor for Voltage-behindreactance model demonstrate the improvement in computational efficiency as compared with the qd or PD model. In this paper Voltage-behind-reactance model is developed in stationary reference frame using MATLAB-SIMULINK platform. Index terms Coupled-circuit(CC) model, qd model, voltage-behindreactance (VBR) model ,phase-domain model, induction machine, dynamic simulation. NOMENCLATURE ,, as bs cs v v v-Input voltage for phase a, b, c respectively in Volts.
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Paper presents analytical and numerical model of three-phase asynchronous squirrel cage motor suitable for fast computation of motor steady state and transient performance characteristics at various operating modes: no-load, rated load and locked rotor. From the motor analytical model, numerical model for computing transient characteristics and magnetic flux density in motor cross-section is deduced. Accuracy of the analytical model is verified by experiment. Influence of various design parameters on motor torque is studied. Derived computer models allow fast changes in motor design and development of various motor variants with improved performance characteristics.
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Journal of Magnetism and Magnetic Materials, 2008
The aim of this paper is to discuss the ability of a numerical code in reproducing a real machine behavior, with particular reference to the cage currents of a four-poles 50 Hz induction motor. The used 2D Finite Element method (FEM) is based on voltage driven field formulation, handling the nonlinearity by the fixed point technique and the rotor movement by the sliding mesh approach. The numerical outcomes are validated by experiments performed on a dedicated laboratory setup, able to provide the instantaneous cage currents. Then, a spectral algorithm has been applied to the experimental and computed variables and the results have been interpreted in terms of magneto-motive forces. This approach allows us to determine possible machine eccentricities or other asymmetries not introduced in the simulations. Discussing the computed and measured spectra and excluding in the last ones the lines corresponding to non-idealities, an evaluation on how the modelling approach reproduces accurately the real machine is possible. The validated model will be able to reproduce the machine behavior of usual induction machines whose rotor currents are not measurable. r