Dynamic Models Of An Electromechanical Electric Drive System Of An Asynchronous Motor

Asynchronous motors require its study not only in stationary modes, but also in dynamic ones. At the same time, this makes it possible to formulate the corresponding requirements for automatic control devices of a regulated IM, the implementation of which will ensure the optimal course of transient processes in the electric drive system; it requires its study not only in stationary modes, but also in dynamic ones. This simultaneously makes it possible to formulate the corresponding requirements for automatic control devices of variable IM, the implementation of which will ensure the optimal course of transient processes in the electric drive system The study of electromechanical transient modes requires a joint consideration and solution of the equations of equilibrium of electrical quantities in the windings of the machine and the equations of motion of an electric drive.

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THEORETICAL AND PRACTICAL PERSPECTIVES OF DIESEL LOCOMOTIVE WITH DC TRACTION MOTORS WHEEL-SETS’ SLIPPING AND SLIDING CONTROL

Transport ◽

10.3846/16484142.2011.633339 ◽

2012 ◽

Vol 26 (4) ◽

pp. 335-343 ◽

Cited By ~ 2

Author(s):

Lionginas Liudvinavičius ◽

Gintautas Bureika

Keyword(s):

Automatic Control ◽

Electric Drive ◽

Drive System ◽

Diesel Locomotive ◽

New Methods ◽

Traction Motors ◽

Factors Influencing ◽

Electric Drive System ◽

Driving Wheel ◽

Main Factors

The causes of slipping and sliding of the locomotive's driving wheel-sets are analysed from theoretical and practical perspectives. The main factors influencing wheel-sets’ slipping are described, and their correlation is determined. The specific methods of stopping the slipping of the Diesel locomotives and having a conventional electric drive system are described in the paper. The process of wheel-sets’ slipping and its control are simulated and shown graphically. Structural diagrams demonstrating the control of the dynamic locomotive wheel-sets’ slipping and sliding, based on the evaluation of the influence of the speed-torque characteristics of DC traction motors on these processes, are presented. Major parameters of the DC/DC and AC/DC systems used in the automatic control of the dynamic slipping and sliding of the locomotive's wheel-sets are defined and new methods of controlling the dynamic slipping and sliding are suggested.

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

Ferrous Metallurgy Bulletin of Scientific Technical and Economic Information ◽

10.32339/0135-5910-2019-3-350-354 ◽

2019 ◽

Vol 75 (3) ◽

pp. 350-354 ◽

Cited By ~ 1

Author(s):

K. V. Litsin ◽

T. V. Koval’chuk

Keyword(s):

Vector Control ◽

Electric Drive ◽

Rolled Product ◽

Asynchronous Motor ◽

Drive System ◽

Automation System ◽

Nominal Data ◽

Electric Drive System ◽

Motor Problems ◽

Electric Equipment

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.

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