Comparative Analysis in the Performance of the FH90 Squirrel Cage Alternating Current (AC) Motor using MP1015 Variable Frequency Inverter Drive and Normal Frequency Supply

Three-phase electric motors are very rugged machines that have to withstand almost endless abuse from end users and still continue to perform to specification. There are several variables of which end user is often unaware. In this study, the researchers will conduct experiments in determining the performance of the FH90 Squirrel Cage Motor first by using the normal frequency supply, second with the use MP1015 Variable Frequency Inverter Drive in the input terminals and third with the aid of a thermistor in the rotor windings. The performance of the FH 90 motor can be determined by plotting the performance curves in each experiment. It is observed that when using the MP1015, the torque is constant when the supply frequency is varied from 48-90 Hz this is because the ratio of the voltage and frequency is constant throughout the experiment. In the third procedure, it is observed that when using MP 1015 VFID in the FH90 motor, the torque of the load is constant and the temperature rises only from 20-30 Hz and from 80 to 90 Hz. Beyond these values, the motor experiences a rise in temperature and thus more power losses has been developed. But when the motor is expected to run in normal frequency supply, the FH 90 motor experiences constant rise in temperature from 0.1 N-m to 0.5 N-m. Thus, the motor must be provided with a cooling fan to prevent it from harmful effects of overheating.