ABSTRACT

Samuel Jie, Three-Phase Induction Motor Modelling and Speed Control  (supervised by Muhammad Tola and  Rhiza S. Sadjad).

This research project is to demonstrate the practical use of a three phase induction motor dq-model in the speed control system design.

The physical parameters of a ..... HP/.....Volt three phase induction motor available at the Power Engineering Laboratory, Atmajaya University, Makassar, INDONESIA are taken as references. Those parameters are including all of the motor's steady-state parameters such as the full-load and no-load speed, no-load tests and the blocked-rotor test. In a simulation, a motor's dynamic model is verified by the physical parameters with ........ % of accuracy in average. 

Based on the motor's dynamic model, a dq-model is developed. By measuring the system's time-constant using the two models - which is ....... seconds - both are shown to be valid dynamic models of the motor. Thus, the dq-model is verified.

The dq-model is tested by applying 3 (three) different kinds of disturbance without any control scheme.  The input voltage disturbance of +/- .....% has given +/- ..... % changes of the output speed. The +/- ....... % of frequency disturbance and +/- ........ % changes of load have affected the output speed up to +/- ....... % and .......% respectively. It is shown that the implementation of a certain kind of feedback control systems has made the effects of the same disturbances neglegible.