| Along with the development of frequency conversion and micro-electronics the capability of an elevator becomes more and more perfect. The control system set up by DSP and embedded chips can make an elevator run much more smoothly, rapidly and precisely. The technology of remote control and management has been applied in all kinds of group control systems. The elevator has been an indispensable equipment of the intelligent buildings. And now, modern ships have been equipped with ship elevators. So engineers on board have to get familiar with the ship elevator performance. The project is developed based on visual software, serial communication and supervision interface. A small lab equipment has been made to simulate the performance of the real elevator.The lab elevator consists of 6 floors and each is about half a meter high, on which offers very good hardware environment to make research. Meanwhile a kind of visual software VisualBasic 6.0 has been selected to be as the development tool in order to make teaching much more convenient. In this paper, logic control, motion control and faults diagnosis of an elevator system has been introduced in detail. The basic functions of an elevator such as calling among floors, control on start up and stop, emergency call, automation running, fire control running, examine and control running, driving running, security supervision, faults diagnosis have been realized.Firstly, the logic control system is the most basic loop of all elevator systems. The logic control software is developed according to the basic calling relationship among floors. And data transmission between computer and experiment equipment has been realized through a data-collecting card named PCL-722.Secondly, the motion control system is the most important loop of all systems. Running smoothly and rapidly indicates a good performance of elevator motion. So a very good elevator makes passengers no feel when it starts up and stops. And it can take passengers move up and down very quickly as well. So to select a good motion curve is very important. In the project a beeline-parabola movement curve has been selected because of its virtue. And a convertor has completed the speed control process, which is able to adjust frequency with a precision of 0.01 Hz. As a consequence the soft start-up and stop can be realized.Finally, the causes and the resolves of the elevator faults have been found according to the research on all sorts of elevators. A faults diagnosis program has been developed to convenient workers in order that they can know the spot of faults without going to the locale. And a faults examination program has also been developed in order to train the engineers on board.In conclusion, quite a lot of useful technologies such as data-collecting technology, serial communication and database technology have been studied in this project. Moreover the training conditions have been improved, and the teaching level becomes much higher.Cong Lin (control theory and control engineering) Directed by Zheng Huayao... |
PDF Full Text Request