Robotics

Robotics is the field concerned with designing, building and controlling machines that can sense their surroundings and act on them. A robot generally brings together three kinds of parts: sensors that gather information about the environment, a controller that decides what to do, and actuators that produce movement. The controller, often a microcontroller such as a small programmable board, reads the sensors, runs a program and sends commands to the actuators, closing the loop between perception and action.

Motors are the most common actuators in robotics, and several types serve different needs. A brushed DC motor is simple and spins faster as more voltage is applied, making it suitable for driving wheels, though it gives no direct information about its position. A stepper motor moves in fixed angular steps each time it is pulsed, so a controller can position it precisely by counting steps without needing a position sensor. A servo motor combines a motor with feedback that reports its position, allowing it to be commanded to a specific angle and hold it; small hobby servos are widely used to move robot arms and joints.

Brushless DC motors replace the mechanical commutator of a brushed motor with electronic switching, giving longer life and higher efficiency, and servo systems may be built around brushed, brushless or AC motors depending on the precision required. Beyond the hardware, robotics involves controlling motion smoothly, interpreting sensor data, and programming behaviour so the machine responds appropriately to changing conditions. These elements combine in machines ranging from simple educational robots to industrial arms and mobile vehicles.

Frequently asked questions

What are the basic parts of a robot?

Most robots combine sensors that perceive the environment, a controller that decides what to do, and actuators such as motors that produce movement.

How does a stepper motor differ from a servo motor?

A stepper moves in fixed steps that a controller counts to set position without a sensor, while a servo uses position feedback to be commanded to a precise angle and hold it.

Why are brushless DC motors used in robotics?

They replace the wearing mechanical commutator with electronic switching, giving longer life and higher efficiency than brushed motors.