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Nigerian Journal of Technology

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Effects of Load and Speed Variations in a Modified Closed Loop V/F Induction Motor Drive

CU Ogbuka, MU Agu

Abstract


This paper investigates the eects of load and reference speed variations in a modied closed loopv=f induction motor drive. A modied approach, involving the addition of a low frequency boostvoltage, is developed and adopted as an enhancement to the conventional closed loop v=f speedcontrol of a three phase squirrel cage induction motor modelled in the stationary qd referenceframe using six-step voltage source inverter waveform. The results obtained show a superiordynamic and steady state performance in the two basic mechanical characteristics: motor speedand electromechanical torque under load variation. The performance of this scheme is simulatedin MATLAB/SIMULINK.

Keywords: induction motor, stationary reference frame, Volts/Hertz v=f control, reference speed, load torque




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