World Journal of Engineering Research and Technology

Peter Daffin Onwe, Eko James Akpama, Ogbonaya Inya Okoro and Ekpenyong Nsa Oku*

ABSTRACT

This paper analyses the dynamic behavior of a five horse-power (5HP) squirrel cage induction machine under balance and unbalance voltage sources. It includes the machine Simulink modeling under dynamic condition, its steady-state and transient analysis. Simulink modeling is used for step-by-step dynamic modeling of the machine while MATLAB is developed for the study of the transient and steady-state behavior of the machine. The torque-speed characteristics of themachine under transient and steady-state are analyzed and compared using MATLAB program developed for the studies. The electromagnetic torque, mechanical rotor speed and current were also analyzed and compared when subjected to balanced and unbalanced voltage conditions. Using reference frame theory to analyze machine performance has proven useful. The article provides a step-by-step Simulink implementation of an induction machine with d-q axis (Park) transformation for stator and rotor variables. The required equations are provided, as it‟s a generalized model of a three-phase induction. The motor is designed and executed in an easy-to-follow manner. The simulated results when compared show that there exists an appreciable difference when the machine operation on a balanced voltage condition as compared to the unbalanced condition in the current, voltage and mechanical rotor speed, electromagnetic torque and the torque speed characteristic are presented.

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