Dynamic Modeling of CNC Drive Systems:
Comparison of Two Models 2019-01-0803
The feeddrive system is an important component of CNC machines and its performance plays a key role in the accuracy and precision of the entire machining system. This paper is mainly focused on modeling of such a system, and the results can be utilized for design, control, and monitoring applications. A 7th order linear model is developed in the state-space format which takes into account the electrical characteristics of the servo system, stiffness, inertia, and damping properties of individual components of the feeddrive system. A detailed parametric study of this model is carried out which reveals the contribution of various components of the system in its transient and steady-state response. The results are used in further simplifying this model to a 4th order systems which is simpler in structure and more appropriate for control applications. A comparison is made between these models and the merits of each individual model are presented.