AC servo motors are alternating current drive motors capable of high-precision control of position, speed, and torque. They incorporate built-in position feedback functionality through encoders and are used for feed axes in machine tools, robot arms, and precision positioning in automation equipment. Unlike stepping motors, they do not experience step loss, offer superior maintainability compared to DC servo motors, and enable variable speed operation through inverter control. They play a central role in high-speed, high-precision motion control in manufacturing lines.