⚙ Motors and actuators

Unit 3 · Robot bodies & control · 8 min

Actuators make robots move. DC motors spin continuously (good for wheels); servos turn to a set angle (often 0–180°), ideal for arm joints; stepper motors move in precise steps, used in 3D printers. Gears trade speed for force.

Words in this lesson

• 电机 (diàn jī) — motor
• 齿轮 (chǐ lún) — gear

Project: Count the teeth on a bicycle's front and rear gears and work out the ratio.