<![CDATA[Three-phase induction motors are widely used as the primary drive in the industrial sector because of their high reliability in supporting production processes. This final-year research project developed an IoT-based monitoring system for three-phase induction motors to monitor voltage, current, power, and temperature in real time via a website, using PZEM-004T (voltage, current, power) and DS18B20 (temperature) sensors. Motor condition analysis was performed using a diagnostic approach based on the National Electrical Manufacturers Association (NEMA) MG-1 14.36 standard, by calculating the percentage of unbalanced voltage, unbalanced current, and motor load percentage. Testing was conducted on two motor conditions: a loaded Direct-on-Line (DOL) motor with specifications of 2,200 watts (3 HP) and an unloaded star-connected motor with specifications of 0.5 HP. Test results for the DOL motor showed a current sensor accuracy of 98.79% (error 1.21%), a voltage sensor accuracy of 99.38% (error 0.63%), and a power sensor accuracy of 98.87% (error 1.13%), with unbalanced voltage at 1.23% and unbalanced current at 2.99%, both of which indicate that the motor is in good condition. For the star-connected motor under no-load conditions, the IoT system recorded an unbalanced voltage of 2.37% (risky condition) and an unbalanced current of 8.79% (good condition), which are consistent with manual measurements taken using a digital multimeter and a digital clamp meter (unbalanced voltage of 2.04% and unbalanced current of 9.09%).]]>
