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《China Mechanical Engineering》 2006-01
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Economical CNC Machine Tool Semi-closed Control and Screw Error Compensation Algorithm

Wang Lisong Zhang Jing Pei Hailong South China University of Technology,Guangzhou, 510641  
To reach the replant demands of open architecture CNC machine tools, a semi-closed control structural model which can be applied for AC servo motor and stepping motor was presented based on false or true mapping. Then the design of proportional plus integal controller for stepping motor used in economic machine tool semi-closed control structure was discussed. To reduce the screw errors produced by the machine tool driving train, the forward and backword positioning values were measured by laser interferometer and the results were used as a nonlinear unit in the semi-closed loop structure to fulfill the screw compensation. The experimental results show that it can reduce accumulate positioning errors of the machine tool servo system from 220μm to 11μm.
【Fund】: 国家自然科学基金资助项目(60374036);; 广东省自然科学基金资助项目(031407);; 华南理工大学自然科学基金资助项目(108-E5040670 108-E5040840)
【CateGory Index】: TG659
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