Study On The Energy Saving Technology And The Characteristics Of Energy In The Running Process About The CNC Machine Tool's Main Driver System Driven By VVVF

The amount of machine tools in China is largest in the world, and the total energy consumption is remarkable. Therefore, the study on energy characteristics and energy saving technology in the running processes of machine tools is very important.Considering the insufficiency of existing studies on energy characteristics about CNC machine tools, this paper focuses on the studies on the energy characteristics and energy saving technology about CNC machine tools driven by VVVF(Variable Voltage Variable Frequency) with the supporting of the National Natural Science Foundation of China and National Science and Technology Supporting Programs. The details are as follows.According to the characteristics of energy transmission in the running processes of CNC machine tools driven by VVVF, the energy flow-chart of main driving system is established. The power transmission characteristics in the main motor and the mechanical transmission system, and every section's energy losses are analyzed. Finally, the power balance equation of the CNC machine tool main driver system driven by VVVF is established. Comparing with the equation of common machine tools, this equation has three characteristics: It includes the variable frequency driver's energy loss;The variable frequency driver's no-sine voltage wave causes mechanical pulse losses in mechanical driving system;Equivalent palstance of main driving system is of uniform continuity。Based on the equation, the energy utilization and energy loss characteristics are analyzed.Four methods of saving energy about the CNC machine tools driven by VVVF are analyzed .It is based on the power balance equation and the power transition characteristics. The process of CNC machine tools idle running is a energy consumption process,and this is the one of main reason of lower energy usage of CNC machine tools. According to the three conditions which are specified speed, specified time and the speed characteristics of continuous variable , A saving energy method which via controlling the speed of main driver of CNC machine tools in the process of idle running is given.When the interval between two process steps is larger than an specified value,The method of energy-saving that stopping CNC machine tool's between process steps is much better than the method of controlling the speed of main driver of CNC machine tools.So an practical method of energy-saving is introduced in the paper. The method is realized by stopping CNC machine tool's when the running process is idle between process steps. The critical value and the computing of saving energy percent also is given in the paper.Because of the slip speed will change when the voltage of VVVF is changed, so we can control the slip speed by controlling the outport voltage of VVVF, A saving energy method of main driven motor of CNC machine tool which running in the defferent state of load is introduced in the paper .This method is realized by optimizing the slip speed in the defferent load state based on the adaptive neural network.The research results are proved and having a good application perspective by some experiments.The experiments is done on the CNC machine tool (CK6136) which main driver is driven by VVVF. The result of experiment is given in the defferent chapter in the paper.