The dynamic characteristics of the rotary axis feed system has influence on the contour error. This paper presents a mathematical model of rotary table drive system of the CNC machine tool by using of mechanical dynamics. The model includes the simulation model of AC servo motor and the rotary table drive system. The time domain and frequency domain simulation characteristic curves can be obtained to show the dynamic performance of the rotation axis. By the simulation results, the rotary axis driver system's rapidity and stability can be analyzed. The study results can provide a reference for the investigating the dynamic performance influence on errors.
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