Speed controllers are devices used to manage the speed of motors in various applications, such as electric vehicles, fans, and conveyor belts. They adjust the power supplied to the motor, allowing for precise control over its speed and performance. This helps improve energy efficiency and prolongs the lifespan of the equipment. There are different types of speed controllers, including DC motor controllers and AC motor controllers. Each type operates based on the specific requirements of the motor and the application. By regulating the voltage or current, speed controllers ensure that machines run smoothly and effectively, enhancing overall productivity.