A servomotor is a rotary actuator that allows for precise control of angular position, velocity and acceleration. It consists of a motor coupled to a encoder for position feedback.

    It also requires a relatively sophisticated controller, often a dedicated module designed specifically for use with servomotors. As the technology of microprocessor unit becomes more advanced and much further, the development and cost effectivity of permanent magnet manufacturing technology for servo motor and high power and high performance semiconductor power devices is improved continuously.

    Therefore, AC servo motor and AC servo control system have become the basic techniques for accomplishing automation control technology in current industry field.