Development of electric drive system with vector control in the facility of inter-stand cooling of sheet rolled product

Abstract

Modernization of the pusher electric drive of inter-stand cooling facility of sheet rolled product is an actual way to increase efficiency of rolling production. The control by the existing electric drive is accomplished by a system, comprising an asynchronous motor. Problems of automation of the facility of inter-stand cooling of sheet rolled product of JSC “Ural steel” sheetrolling shop considered. Modernization of existing system by implementation of frequency convertor with vector control proposed. To restrict the pusher movement it proposed to use induction sensors and controller SIMATIC S7-300. Algorithm of the pusher operation with induction sensors application considered. The elaborated algorithm of the pusher operation realized on the base of SIMATIC S7-300 controller. Calculation and building of load diagram and the pusher drive tachometric diagram accomplished for one cycle of its operation. Taking into account nominal data of the pusher selected motor and requirements to electric equipment, a frequency convertor with vector control was selected. Implementation ofthe system “frequency convertor – asynchronous motor” with vector control justified. The vector control enables to provide a preset pace of the motor acceleration, its complete protection against over-loading that increases considerably service life of the electric drive system as a whole. Application of frequency controlled pusher drive together with SIMATIC S7-300 controller will enable to automatize the process of the pusher operation. Implementation of the developed automation system of the pusher electric drive operation is possible also at other steel-works.The payback period of the solutions proposed within the frame of the project will be 9 months.