Research On Braking System's Performance When Reconstructing An AC Hoist

Considerable part of mine hoist is driven by wire-wound AC motor and its speed is changed through adding metal resistance to the motor's rotor. When Braking, using the manual operation to achieve the hoist's coordination control between the braking system and the drive system, In order to improve mine production level of automation and production efficiency, we must upgrade the old control system.Hoist system consists of mechanical transmission system, electrical drive system and the braking system. Based on the results of the previous studies and without changing the mechanical system and the electric drive system, this thesis does not change the mechanical transmission system and electrical drive system. It is conducting an analsis of the braking systems' automation reconstruction in the context of the project of " The Digital Transformation of a AC Hoist".After reconstructing, this paper sets up a lifting system dynamics model, electrical drive system model and the braking system model and the corresponding simulation model based on MATLAB. Then it designs the braking system's PID controller. Finally with the established of the system simulation model, the electric transmission system Simulation Model, braking system simulation model and the simulation model of the PID controller, it has established the entire lifting system simulation model, and conducted its analysis. The simulation results show that this reconstruction program can automatically achieve the hoist's braking system and drive system's coordination controls, and it can achieve a smooth slowdown, and it is an effective practicable program.