Abstract
The thesis includes five small sections, the first chapter tells the story of the development of the elevator, its technical parameters and composition. The second chapter summarizes the working principle of VVVF elevator, which contains the elevator speed control system mode and system structure principle. Third chapter tracing elevator system design scheme, including the elevator drive system and control system. The fourth chapter is about progress on the elevator system. The last chapter is the summary of this paper.
Key words: elevator design; PLC; Electrical control