In this work, a 20-kW, 48-slot, 4-pole, 3-phase, 380V, 50Hz, squirrel-cage induction motor was refurbished and subjected to a steady-state performance analysis. A computer-aided approach was adopted requiring the development of a software application package to that effect. In this paper the authors present the performance equations derived from the L-configured equivalent circuit of 3-phase induction motors. The equations enabled the generation of the necessary program using the MATLAB programming language. By means of open-circuit and short-circuit laboratory tests the six voltage, current and power quantities required as the major input variables to the software application package were obtained. Running the software package with these experimental quantities led to the determination of the machine equivalent circuit parameters in the first instance. And by using the parameters in the same running process the software package also produced the motor performance quantities and curves for analytical purposes. The analysis showed the motor as exhibiting satisfactory full-load values of torque, speed, output power, slip, power factor and efficiency.

Full text: IJEIR_1149_Final.pdf