Analysis and design of AC servo motion drive control system with 2-mass mechanical resonant load

Abstract

This paper describes a new control method and its optimum design for servo motion drive system with 2-mass resonant load. In the first place, its new control method is proposed which is composed of a speed control loop with a PI compensated controller and a load speed feedback loop to prevent the mechanical resonance or anti-resonance generation in this system. The load speed is detected by an observer possible to sense the accurate load speed even if the load disturbances change. In the second place, a new design method for the servo motion drive system treated here is presented, which is based upon the a parameter ultimate sensitivity method. This design method is possible to calculate the optimum control gains by using only one parameter /spl alpha/. By setting the optimum control gains to a servo motion drive system, it will be able to improve not only the stability of the servo system near the frequency ranges of the mechanical resonance or anti-resonance, but also the characteristics of the dynamic response in the servo motion drive system. Finally, several simulation results are illustrated and the effectivenesses of the control implementation in addition to the optimum design method are proved sufficiently.