MODEL ING OF THE CRANE ELECTRIC DRIVE CONTROL SYSTEM OPERTATION MODES, TAKING INTO ACCOUNT TIME CHANGES AT THE MOMENT OF INERTIA OF THE ROTATING MASSES

Abstract

The given paper contains the survey of the available publications, devoted to the   study of the processes, occurring  in the electromechanical systems of the cranes during   lifting/lowering of the load. The analysis of the research carried , showed that  the authors of these publications did  not take into consideration the change in time of the equivalent moment of inertia  of the electric drive system rotating masses, and it is not correct. As  in the process of lifting/lowering of the load the  moment of inertia  of the rotating masses and moment of loading  become the time functions it is necessary to perform the simulation of the operation modes  of the crane electric drive control system, taking  into consideration the varying  parameters, caused by  changes in the time of the  equivalent moment of inertia and loading moment of  tractive electric motor in the process of lifting/lowering of the load.

In the considered sections of the given study the operation modes of the  electric drive control  system of the crane are considered in details, simulation of the operation modes of the  electric drive control  system of the crane is performed, taking into account variable parameters, stipulated by the changes in time  of the equivalent moment of inertia  and loading moment of the traction electric motor in the process of lifting/lowering of the load. Using the obtained general equations of the dynamics and taking into consideration the given relations for the determination of the electric motors torques the simulation models for the  asynchronous electric motor of  КМ АИР250М type are constructed. The simulation models are constructed in the Matlab environment, using Simulink, it enables to perform further analysis with maximum efficiency and minimum expenses of time.

The results of the research are given, taking into account the parameters of the motor while acceleration, braking, maximum speed, idle motion and reverse of the electric traction drive. The comparative comprehensive  analysis of the results obtained is carried out.