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
Keywords:model, control system, electric motor, traversing mechanism
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.