Abstract
A refurbished 2.2kW 3-phase squirrel-cage induction motor was subjected to a steady-state performance analysis. It was earlier refurbished to reflect a prevailing local maximum 3-phase voltage level of 380Vac, as against the manufacturer's name-plate nominal voltage of 415Vac. The aim was to obtain from the motor at 380Vac satisfactory values of the operational quantities as obtainable at the original voltage level of 415Vac. To this end the method of open-circuit/short-circuit laboratory tests was adopted, the d.c. resistance test notwithstanding. The experimental calculations from these led to the determination of the machine equivalent circuit parameters by means of which the motor operational quantities and the performance curves for analytical purposes were obtained. MATLAB was used to generate the performance curves via the appropriate mathematical models. The analysis showed the motor as exhibiting satisfactory full-load values of torque, speed, output power, slip and power factor, although at the expense of full-load efficiency and starting properties.
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