This paper aims to develop the energy flow model of mechanical servo press, which serves as the quantitative analysis tool for servo press energy efficiency optimization. A modular modeling method is used to address the variety of component configuration and complexity in electromechanical coupling mechanisms of mechanical servo press. Based on the general function principles and structure model of the servo motor drive linkage press, the consisting modules of the energy analysis model are first identified and interactions between modules are established. Then, the module of the servo motor and linkage mechanism, which are the major configurable parts are presented with more details. A case study of six-bar servo press energy analysis using the proposed model is also presented. The proposed method can strengthen product model building and enhance the convenience of energy efficiency design of mechanical servo press.

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