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Robotics · Module 3 of 10

Actuators and motors

Power robot movement.

📖 Key ideas

  1. DC motors: simple, continuous rotation; control speed with PWM.
  2. Servo motors: precise angle control.
  3. Stepper motors: precise steps for positioning (3D printers).
  4. Motor drivers and H-bridges control direction and power.
  5. Gears trade speed for torque.
💡 Real-life example: Motors are robot muscles; gears are the bicycle gears choosing speed or strength.
DC motorContinuous rotation motor
ServoAngle-controlled motor
Stepper motorMoves in precise steps
H-bridgeCircuit reversing motor direction