The theory of reference frames has been effectively used as an efficient approach to analyze the performance of the induction electrical machines. This paper presents a step by step Simulink implementation of an induction machine using dq0 axis transformations of the stator and rotor variables in the arbitrary reference frame. For this purpose, the relevant equations are stated at the beginning, and then a generalized model of a three-phase induction motor is developed and implemented in an easy to follow way. The obtained simulated results provide clear evidence that the reference frame theory is indeed an attractive algorithm to demonstrate the steady-state behavior of the induction machines.
Figure 1 the 3-phase induction motor Matlab/Simulink model
EXPECTED SIMULATION RESULTS:
Figure 2 Torque speed characteristics for the 3 hp induction motor
Figure 3 Machine variables during free acceleration of a 3-hp induction motor
Figure 4 Torque speed characteristics for the 2250 hp induction motor
Figure 5 Machine variables during free acceleration of a 2250-hp induction motor
In this paper, an implementation and dynamic modeling of a three-phase induction motor using Matlab/Simulink are presented in a step-by-step manner. The model was tested by two different ratings of a small and large induction motors. The two simulated machines have given a satisfactory response in terms of the torque and speed characteristics. Also, the model was evaluated by Matlab m-file coding program. Both methods have given the same results for the same specifications of the three phase induction motors used in this simulation. This concludes that the Matlab/Simulink is a reliable and sophisticated way to analyze and predict the behaviour of induction motors using the theory of reference frames.
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