Research on strategy of elevator frequency control based on relative distance speed control

YU Lin1， LI Sheng2
（1. Zhejiang Institute of Mechanical & Electrical Engineering Co. Ltd.， Hangzhou 310002， China；
2. Department of Mechanical Engineering， Zhejiang University， Hangzhou 310027， China）

Abstract： Aiming at the traditional time elevator speed control method is of low efficiency and low comfort，the relative distance speed control method was used to control the elevator speed. In the research of elevator control strategy，the parabolic-straight line speed curve shape was chosen as a standard curve，and the speed curves of different distances were designed. In the hardware design，microcomputer was adopted to set up communications between the host and the motor inverter through serial interface. In software design，the ideal of parabolic speed curve was sectioned to keep speed value，and then the real-time speed value of elevator was gotten through the look-up tables in the operation. The results indicate that，comparing the traditional time speed control way，the relative distance speed control way can significantly reduce the crawl distance，and improve the efficiency and comfort of the elevator.
Key words： elevator；frequency control；speed curve