On-Line Torque and Drawing Force Estimation in Wire Drawing Process from Electric Motor Variables

In this paper, an alternative on-line drawing force and torque estimation method for use in wire drawing processes is presented. The method considered here is based on a simple Luenberguer observer and uses only measured variables available from a motor drive system such as terminal voltages and currents and rotor velocity. The proposed algorithm permits to implement functions such as condition monitoring of die wear, workpiece fracture and lubricant analysis. The performance and some practical implementation features of the load torque estimator are analyzed. Theoretical development and simulation results are presented to support the use of such method on load torque and drawing force estimation.