DYNAMIC MODELLING AND SIMULATION OF THREE PHASE INDUCTION MOTOR FOR ENHANCED PERFORMANCE

Dedication

 

REFERENCES

 

 

4.30: (a) Graph of Rotor speed against Time (b) Graph of Electromagnetic Torque against Time (c) Graph of Electromagnetic Torque against Rotor speed (d) Graph of Mechanical Rotor Speed against Time.  40

 

Induction motor is defined as a type of brushless electric motor in which an alternating supply fed to the windings of the stator creates a magnetic field that induces a current in the winding rotor. Rotation of the rotor results from the interaction of the magnetic field created by the motor current with the field of the stator. (Collins English Dictionary) .The poly phase induction motor is by a very considerable margin, the most widely used ac motor (almost more than 90 percent of mechanical power used in industry is provided by 3 – phase motors).The reasons are low cost, simple and rugged construction, absence of commutator, good operating characteristics (reasonably good power factor, sufficiently high efficiency and good speed regulation). An induction motor of medium size may have an efficiency as high as 90 percent and power factor of 0.89. It is substantially a constant speed with a shunt characteristic; a few percent speed drop from no load to full load. The physical size of such a given motor for a given output rating is relatively small as compared with other type of motors (Gupta, 1999). The steady state mathematical modelling of Induction machines is not new and has received a considerable attention from researchers dated far back as the machine itself. On the other hand, the transient mathematical modelling of induction machines continues to receive enormous attention and will continue to do so because of the vital effect the transient behavior of the induction machine has on the overall performance of the system to which it forms a component part. Unlike the steady state modelling, transient modelling proves to be more difficult both in the definition of suitable forms of equations and in the application of appropriate numerical methods needed for the solution of same. However, appropriate mathematical transient models for most machine types were found when the generalized d-q axis theory was developed and the space vector theory evolved. With the advent of digital computers, digital simulation techniques of these models appear most suitable for the analysis because numerical methods must be used, as the resulting differential equations are non-linear (Okoro, 2003).

Most of Industries are faced with the problems of how to controls the speed of Induction motor which have affected productivity and product quantity. To eliminate this problem that is why I model and simulate the mechanical and electrical equation of Induction motor and study the sensitivity of the parameters by varying it.

The main aim of the proposed research is to enhance the performance of Induction Motor The objectives include:

In this research, we intend to enhance the performance of Induction motor by modeling and simulating the mechanical and the electrical equations of Induction motor. The parameters are varied to study the sensitivity.

Chapter Two presents a comprehensive survey of previous work done on the simulation and modeling of Induction Motor. The proposed Electrical and Mechanical simulation using dqo reference frame model is presented in Chapter Three. The determination of the dynamic behavior of the motor under varying parameters and discussion of results of the proposed model are shown in Chapter Four. Conclusion and recommendations are summarized in Chapter Five.