Servo motor should be designed to fit the characteristics of the servo system: fast, accurate and stable. So the servo motor design key points: light weight, large output, fast response, high speed, small inertia, smooth rotation, stable torque and so on.
Precision: Servo motor realize the closed-loop control of position, speed and torque; overcome the problem of stepping motor.
The robot has high requirements for the servo system, which must meet the conditions of fast response, high starting torque, large torque inertia ratio and wide speed regulation range. To adapt to the body of the robot to achieve small volume, light weight, acceleration and deceleration operation, and needs high reliability and stability. At present, industrial robots use more AC servo system.