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This paper presents the construction and laboratory investigation of an IoT (Internet of Things) based smart system to control, measure, and monitor the bidirectional speed control of single-phase induction motors (SPIM) remotely. The design prototype consisting of two single-phase induction motors demonstrates multi-motor control. The motors are turned ON and OFF by a specific relay operation. To achieve the desired motor speed, the stator voltage control method has been applied by using Pulse Width Modulation (PWM) technique. For reversing the motor direction of rotation, the stator magnetic field is reversed by swapping the contacts of auxiliary winding by relay operation. Whenever the desired value is submitted for a specific operation from a specially designed website, the desired control signal is generated from a programmed microcontroller according to the user's command via a webserver using GSM communication. Motor status data is measured using an IR sensor and observed remotely on the monitoring panel integrated with a web application. The result shows little deviation compared to direct field measurement. The IoT-based smart motor control system can be used in this modern age to continuously track, control, and monitor machines, goods, plants, etc. for versatility in multi-purpose applications. |
