A sensor module combining accelerometers and gyroscopes (and sometimes magnetometers) to measure a robot's acceleration, angular velocity, and orientation in 3D space.
The robot's inner ear. Just like your inner ear tells your brain which way is up and how fast you're turning, an IMU tells a robot how it's moving and tilting. Essential for balance and navigation.
Why It Matters
Without an IMU, a walking robot would fall over and a flying drone couldn't hover. IMUs provide the real-time orientation and motion data that control systems need for balance, stabilization, and dead-reckoning navigation. They complement cameras and LiDAR by working in all conditions, including GPS-denied environments.
Real-World Examples
- A 9-axis IMU in a humanoid robot's torso maintaining upright balance while walking
- A high-precision IMU in a drone for stable hovering and attitude control
- IMU-based motion tracking in an exoskeleton that follows the wearer's movements
China's IMU industry benefits from massive smartphone and drone manufacturing scale. Companies like WITMOTION (Shenzhen) produce low-cost MEMS IMUs that are used in thousands of robot designs. DJI's internal IMU technology, developed for drones, is considered among the world's best for consumer-grade applications.
