Research On Design And Key Technologies Of Rapid Locating System Drived By VCM

Rapid precision locating technology is one of basic aspects in Precision Engineering field, and its development promotes great progress of Precision Engineering technology, thus it is very important and significant to research rapid precision locating technology. Compared with the traditional precision locating technology, a rapid locating system drived by voice coil motor (VCM) is brought forward in this dissertation. In the locating system, aerostatic guide is used to orient and support, voice coil motor is applied as drive equipment, and the system represents many merits such as long stroke, big acceleration, high stiffness and big load. On the basis of above work, some research contents are completed, including the design of rapid locating platform, the analysis and identification on system model, the design of control system, testing and improvement on system performance. The main work are expressed as follow:1. Several locating platforms which can satisfy moving performances have been designed by analyzing the design method, principle and requirements. An optimal structure is selected after the comparison of these platforms'performances. Aerostatic low-mass slide, which is a key part in locating platform, is carefully designed, and its load and stiffness are analyzed. Moreover, a kind of spherical shaft coupling is designed, which can achieve stable connection with high precision between voice coil motor and locating platform.2. The system's coupling characteristic of mechanics and electricity is analyzed. The transfer function model is founded on the conditions of long stroke and big acceleration. At the same time, the parameter identification is implemented by using least square method and levy method.3. PID control method of rapid locating system is studied and PID parameters are set. The locating error is corrected by applying PID predictive compensation method and fuzzy predictive compensation method. The system's close-loop control feature is studied in force mode, control algorithm is designed, and corresponding experimental verification is implemented.4. The general performances of rapid locating system are synthetically tested and improved.