Anti Swing Control using Variable Frequency Drive for Overhead Crane

Abstract

Overhead cranes are widely used in industry to lift and transport the heavy loads. Without using a controller, it is difficult to control swinging of load. In this case, to increase the productivity, it is necessary to move load as quickly as possible. Swinging of load increases the risk of any harm and also decreases the productivity. Previously, it was compulsory to use PLC system externally in order to control the overhead cranes, which requires more floor area. This compulsion of the PLC is due to under development of control strategies for controlling the crane structure. In this project, based on the analysis of mathematical model of overhead cranes, the payload swing is shown by the simulation in open loop. Further the load adaptation process used to calculate the mass of the load. Which is integrated in the controller it self. Anti-swing control of the load is achieved through Speed feedback and Torque feedback from the VFD. PID controller used to minimize the swinging of load. It can be seen from the results of the simulation, the anti-swing control is obtained. Assuming the gear ratio and radius the open loop simulation and close loop simulation has been done. Further, It is necessary to consider in the future, exact values of gear box ratio and effective radius with gear box to see the practical implementation.