Induction motors are widely used in industrial and domestic applications due to their reliability and simple construction. However, efficient control and protection of induction motors are essential, as they are highly susceptible to damage caused by overheating, excessive vibration, and improper operating conditions. This project presents an Induction Motor Controller and Protection System that provides effective speed and direction control along with real-time monitoring of critical motor parameters. The system is built around an ATmega328 microcontroller, which acts as the central control unit. Speed control of the induction motor is achieved using a PWM-based phase angle control technique, implemented through an optically isolated DIAC–TRIAC circuit. A zero-crossing detector is used to ensure precise firing of the TRIAC, resulting in smooth and efficient motor operation. The AC motor receives controlled power directly from the AC supply through the TRIAC. Wireless control is enabled using an HC-05 Bluetooth module, allowing an Android mobile application to send commands for increasing speed, decreasing speed, and changing the direction of the motor. A 10k potentiometer is also provided for manual speed control. Motor safety is enhanced by integrating a temperature sensor and a vibration sensor, which continuously monitor motor conditions and generate alerts during abnormal situations. Visual indications are provided using LED indicators, and real-time system parameters are displayed on an LCD. A regulated power supply ensures stable operation of all electronic components. The proposed system improves motor performance, enhances safety, and reduces the risk of motor failure, making it suitable for industrial automation and protection applications.    

Objectives of this project:

  To design and develop an induction motor speed and direction control system using a microcontroller.

  To implement PWM-based phase angle control of an AC induction motor using an opto-isolated TRIAC circuit.

  To enable wireless motor control through an HC-05 Bluetooth module using an Android mobile application.

  To measure and monitor motor operating conditions using temperature and vibration sensors.

  To provide motor protection by generating alerts during abnormal temperature or vibration conditions.

  To display real-time motor parameters and system status on an LCD display.

  To ensure safe and reliable operation using optical isolation and a regulated power supply.

  To improve motor efficiency, reliability, and lifespan through continuous monitoring and control.      

The major building blocks of this project are:  

1. Regulated Power supply.
2. Atmega328 Microcontroller.
3. Bluetooth module
4. AC induction Motor with TRIAC driver.
5. Bluetooth.
6. Temperature Sensor.
7. Vibration Sensor.
8. 10k POT (potentiometer).
9. LCD display.
10. Zero crossing detector.

    Software’s used:  

• Embedded C programming.
• Arduino IDE for dumping code into Micro controller.
• Express SCH for Circuit design.

      Regulated Power Supply:

         

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