Synchronously Running Control Method for Four Machines of Double-Side Shear

This paper mainly presents the asynchronous running control design and application for multiple electrical machines in steel industry production by an example-the double-side shear that includes four machines. In the steel producing line, the double-side shear has the task of trimming the plate fed to it by the pinch roll units on both length sides and chopping the edge scrap thus produced with the aid of the scrap shear. It performs this task in continuous operation. Four asynchronous motors are synchronously controlled by four separate inverters whose connections are realized by SIMOLINK (Siemens motion link) software. All control impulse signals are transferred to every inverter by PLC (programmable logic controller) with less than 0.001 s error. The shearing technology parameters for steel plate directly also influence the motor running status