Are FANUC robot axes driven by servo motors?

• A. False
• B. True
• C. Depends on the model
• D. Not necessarily servo motors

Answer: (B)

FANUC robot axes are driven by servo motors because precise, controllable motion with real-time feedback is essential for robotic joints. Each axis operates with a servo motor paired with a servo drive and an encoder that provides position and speed feedback to the controller. The controller sends trajectory commands, and the servo drive regulates motor current to achieve the desired position, speed, and torque, correcting any errors as the robot moves. This closed-loop arrangement gives high accuracy, repeatability, and responsiveness across different payloads and speeds, which is why the standard FANUC architecture uses servo motors for each axis. While occasional special cases or legacy configurations may exist, the typical and most reliable setup is indeed servo-driven axes.