The Optimization of the Dynamic Regime of the Asynchronous Vectorial AC Motor in Flying Shear

Abstract

The high-performance length cutting lines of the strip use the Flying Shear, a mechanism that is moved by a vector controlled three-phase asynchronous motor. The operating principle of the cutting line involves a complex dynamic regime, continuous cutting of the strip in sheet at a maximum speed of 45 meters per minute (mpm), where the entire mechanism of the flying shear are moving backward and forward to perform the cut and return to zero point position. Due to the frequents reversing process, the objective of this paper is to optimize the dynamic regimes of the process in order to minimize the energy consumption. From the hierarchical control architecture, the induction motor control is performed at the First Level, where the PLC device sets the direction of movement and the speed value reference, and a Simotion Drives (D425) transforms the PLC's sets into electrical AC voltage signals settings that supply the motor. The complex dynamic operating mode of the motor is given by cutting sequence process: the normal cutting sequence at constant line speed, to which is added the continuous speed changes required by the human operator or the line speed deceleration regime in the event of stop or breakdown conditions.