Analysis of energy consumption in fundamental motion of industrial machines and experimental verification

This paper considers consumed energy reduction in fundamental point to point feed motion of industrial machines. First, we present a method to predict the energy consumed in AC motors operated in an S-curve trajectory consisting of trapezoidal acceleration/deceleration periods and constant velocity period, which are widely used in industrial machines. Energy consumption in each period and a linear acceleration period that minimizes the energy consumption are derived analytically. The analytical result shows that the trapezoidal velocity trajectory provides less energy consumption than the S-curve trajectory. The validity of the analysis is verified experimentally by applying to an industrial machine tool system.