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Journal of Engineering and Applied Sciences
Year: 2008  |  Volume: 3  |  Issue: 9  |  Page No.: 697 - 701

On the Maximum Efficiency of Induction Motor Drive Using V/I Algorithm

R. Razali, A.N. Abd Alla, M.A. Choudhury and P.K. Shadhu Khan    

Abstract: Researchers as well as the industries have great interest in energy efficient operation of Induction Motor Drives (IMD). This can be achieved if the IMD is operated at its maximum efficiency under different loading conditions. In this study, the on-line voltage/current V/I control scheme to operate IMD at its maximum efficiency is introduced. The steady-state per phase equivalent circuit of induction motor is used to derive the V/I reference expressions. The control method requires supplied current, voltage, frequency and motor constants to achieve the maximum efficiency operating region. The V/I algorithm is realized through a control software and single-chip 3-phase AC motor controller, MC3PHAC supervised by Personal Computer (PC). Experimental result shows that V/I ratio under different loading conditions met the targeted value by changing the modulation index. The proposed method is suitable to low horsepower HVAC motors where oversize and/or have a wide load variation.

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