University of Khartoum

New Soft-Starting Firing Scheme for Induction Motor

New Soft-Starting Firing Scheme for Induction Motor

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Title: New Soft-Starting Firing Scheme for Induction Motor
Author: Kafi, Khalid Ali Rezigalla
Abstract: Pulse width modulation (pwm), is a technique for the starting of three phase squirrel- cage induction motor, which depends on the relationship between the source frequency and electromagnetic torque. The objectives of this study is to firstly design a three-phase induction motor system through analyzing its equations by using DQO transformation and programme the equations by using matlap/simulinks, which basically describe the dynamic performance and the behavior of the three-phase induction motor, through the simulation results. The second objective is to subject the designed system of three-phase induction motor to a variable frequency source. According to the subjection of a variable frequency source the study reached that, as the width of pulses per cycle decrease the resultant electromagnetic torque decrease. And as a result, a new starting technique of pulse-width modulation has been designed. Simple firing scheme have been designed and tested to keep the current to allowable limit during starting, and to eliminate starting torque pulsation. The study and the dynamic behavior have been simulated and verified using Matlab/Simulink. The simulation reads that there is 90% decreases in the maximum starting torque under no load and 75% in full load condition. These are shown to be very effective in the elimination of switching transient torques and to reduce the starting inrush current, as well as the new technique gives the three-phase induction motor 50% load torque to be carried.
Description: 49page
URI: http://khartoumspace.uofk.edu/123456789/26124


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