BLDC Motor Speed Controller With RPM

BLDC Motor Speed Controller with Arduino and LCD

Project Overview

This project outlines the development of a BLDC motor speed controller using an Arduino, LCD module, keypad, and various electronic components. The device allows users to set a desired RPM (Revolutions Per Minute) for the motor and displays both the current and target RPM on the LCD screen.

Components

• Arduino Uno (or compatible board)
• BLDC Motor
• LCD Module (e.g., 16×2 character display)
• 4×4 Keypad
• Breadboard
• Power NPN Transistor (e.g., TIP120)
• 12V Power Supply
• Jumper Wires
• Resistors (values depend on LCD and keypad)

Functionality

1. Setting Target RPM: The user presses the asterisk (*) key, clearing any previous data on the LCD. Subsequent key presses enter the desired RPM digit by digit. Pressing the hash (#) key confirms the target RPM.
2. RPM Display: The LCD continuously displays the current RPM of the BLDC motor, obtained by sensing the motor’s speed using appropriate methods (discussed later). The target RPM is also displayed for reference.
3. Speed Control: The Arduino controls the BLDC motor using the power NPN transistor acting as a switch. By adjusting the Pulse Width Modulation (PWM) signal sent to the transistor, the Arduino regulates the power delivered to the motor, influencing its speed. The system aims to maintain the motor’s RPM close to the target value through control algorithms implemented in the Arduino code.

Report Sections

A well-structured report should include the following sections:

1. Introduction: Briefly describe BLDC motors, their speed control importance, and the project’s objective.
2. Components: List the components used and their functions. Include specifications for key components like the motor and LCD.
3. Circuit Diagram: Illustrate the circuit schematic with clear labeling of components and connections.
4. Arduino Code: Explain the program logic. Briefly discuss how the code reads keypad input, controls the LCD display, reads motor speed (sensor selection and code implementation needed), and implements the control algorithm (e.g., proportional-integral control) to maintain the target RPM.
5. Testing and Results: Describe the testing procedures to verify the functionality. Discuss achieved results, including the accuracy of RPM measurement and the effectiveness of the speed control mechanism. Mention any limitations or areas for improvement.
6. Conclusion: Summarize the project’s achievements and potential applications.

Additional Considerations

• Motor Speed Sensing: Explore methods to sense the BLDC motor’s speed. Options include using Hall effect sensors mounted on the motor or back-EMF sensing techniques. The Arduino code will need to be adapted based on the chosen method.
• Control Algorithm: For maintaining the target RPM, consider implementing a simple proportional-integral (PI) control algorithm in the Arduino code. This is a common approach for motor speed control.
• Safety: Exercise caution while working with electronics and BLDC motors. Ensure proper power supply connections and consider adding safety features like motor current limiting.

Report Note

This is a guide to help you structure your report. You’ll need to fill in the specific details of your project implementation, including circuit component values, chosen speed sensing method, and control algorithm code.