Speed control with PID in Simulink - Mini Project: Build & Apply

Speed control with PID

📖 Scenario: You are working on a simple speed control system for a motor. The motor speed needs to be controlled to reach a target speed smoothly and accurately. You will use a PID controller concept to adjust the motor speed based on the error between the target speed and the current speed.

🎯 Goal: Build a simple Python program that simulates a motor speed control using a PID controller. You will create the data for speeds, set PID parameters, apply the PID control logic, and output the adjusted motor speeds.

📋 What You'll Learn

Create a dictionary with current motor speeds for three motors

Create a variable for the target speed

Write a loop that calculates the PID control output for each motor

Print the adjusted speeds after applying the PID control

💡 Why This Matters

🌍 Real World

PID controllers are widely used in real machines like motors, robots, and vehicles to keep speeds or positions steady and accurate.

💼 Career

Understanding PID control logic is important for roles in automation, robotics, and control systems engineering.

1

Create current motor speeds dictionary

Create a dictionary called current_speeds with these exact entries: 'motor1': 45, 'motor2': 50, 'motor3': 55 representing the current speeds of three motors.

Simulink

# Create the current_speeds dictionary with motor speeds
# Your code here

Hint

Use curly braces to create a dictionary with keys as motor names and values as speeds.

2

Set the target speed

Create a variable called target_speed and set it to 60 representing the desired speed for all motors.

Simulink

current_speeds = {'motor1': 45, 'motor2': 50, 'motor3': 55}
# Set the target_speed variable to 60
# Your code here

Hint

Just assign the number 60 to the variable named target_speed.

3

Calculate PID control output for each motor

Create an empty dictionary called adjusted_speeds. Use a for loop with variables motor and speed to iterate over current_speeds.items(). For each motor, calculate the error as target_speed - speed. Then calculate the adjusted speed as speed + 0.1 * error (this simulates a simple proportional control). Store the adjusted speed in adjusted_speeds with the motor as the key.

Simulink

current_speeds = {'motor1': 45, 'motor2': 50, 'motor3': 55}
target_speed = 60
# Calculate adjusted speeds using a for loop and proportional control
# Your code here

Hint

Use a for loop to go through each motor and calculate the new speed using the error and a proportional factor of 0.1.

4

Print the adjusted speeds

Write a print statement to display the adjusted_speeds dictionary.

Simulink

current_speeds = {'motor1': 45, 'motor2': 50, 'motor3': 55}
target_speed = 60
adjusted_speeds = {}
for motor, speed in current_speeds.items():
    error = target_speed - speed
    adjusted_speed = speed + 0.1 * error
    adjusted_speeds[motor] = adjusted_speed
# Print the adjusted_speeds dictionary
# Your code here

Hint

Use print(adjusted_speeds) to show the final adjusted speeds.