Study On AC Servo System For CMK61200D×80/32 Heavy Horizontal Numerical Control Machine Tool With Turning And Grinding Ability

The processing problem related to the rotor and axis of the heavy generator or motor, which are used in electric power system, is always the most important point in motor manufacturing. If something improper happened during manufacturing and assembling, such as rotor mass eccentric and match gap misfit, strong vibration and noise, which are caused by the rotary mass dissymmetric with the rotary axis, will be lead in while operation, so does the unstable performance. On the basis of this problem, the requirement of achieving multi-procedure on one machine is proposed, and the heavy horizontal lathe and grinder numerical control machine CMK61200Dx 80/32, which is newly developed combined with lathe, grinder and milling, is competence. But how to ensure the rapid response speed and the good noise-proof-feature is the issue we faced, this required some essential analysis of the servo capability.In this paper, the function of each part in the heavy horizontal lathe and grinder numerical control machine CMK61200D x 80/32 servo drive system are analyzed particularly. The suppression of the disturbance in the AC servo system is researched in focus, and the standard EL controller is brought forward to replace the conventional PI rotational speed controller and the advantage is to improve the noise-immune performance and also the processing accuracy.First, the function, accuracy and construction of the machine are analyzed. In the course of analyzing, the servo system structure style used in the machine is determined, and the servo system control method matching with its structure style is put forward.Second, the AC servo motor system is proposed, including the Permanent Magnet Synchronous AC servo motor is adopted, the whole equivalent circuit of the stable operation with the PWM control motor power drive circuit is proposed and also the corresponding steady-state characteristics computing program. The current controller, speed controller and position controller are introduced one by one. Third, the design idea of H_∞controller is brought forward. The conventional PI rotational speed controller is replaced by standard H_∞controller, and the noise-immune performance is improved, so do the processing accuracy.At last, the emulation and the calculation research work of the amelioration scheme on the basis of quantitative study is carried out. The scheme is prove to have the capability of fast and accurate tracking and noise-immune and ensure the robust stability of the system, so as to improving the capability of noise-immune and the accuracy of the system.