Abstract: The studies on energy efficiency assessment for machine tools and manufacturing systems are rapidly emerging, and the energy efficiency acquisition during machine tools’ service process (MTSP) becomes one of the key problems. Hence, the acquisition method of the energy efficiency of the electro-mechanical main driving system (EMDS) during MTSP is researched. Based on the analysis of the connotation of energy efficiency of machine tools, and the multi-period energy model of EMDS during MTSP, four EMDS energy efficiency models of two kinds which separately depend on the input power information and the cutting power information are established. Then the approaches for acquiring the models’ parameters, especially the load loss coefficients are proposed. Finally the energy efficiency acquisition method for EMDS during the MTSP is formed. By applying this method, the energy efficiency of EMDS during MTSP could be easily obtained by monitoring the input power of EMDS. The case study shows the on-site energy efficiency acquisition of MTSP could be achieved with satisfied accuracy by this method, so that the method may be widely applied in the energy efficiency assessment, monitoring and optimization for machine tools and manufacturing systems.

Key words: Efficiency, Energy, Machine tools