Regarding the elevator door protection , the elevator industry has taken a long and steady course from touch boards , to pairs of magic eyes , then to edges 在电梯门保护方面，从触板到电眼，再到光幕，业界经历了漫长而坚定的历程。
Added turbolift wall made by foam board . to make it longer we ' ve added a section made of paper , can you tell which section 远方增加了一面新的墙和电梯门(由珍珠板构成) 。为了让走廊更长，制作了一段由纸做的走廊墙面(你看得出哪一面是纸做的吗? ) 。
The thesis is relative to elevator door drive device , which include permanent magnet brushless dc motor ( bldcm ) and msp430f149 mcu composing a high performance servo system 本文研究是关于电梯门机控制系统的设计与研制，该系统使用16位单片机msp430f149为核心，控制无刷直流电动机，组成一套高性能伺服系统。
On the basis of analyzing the dtc techniques all over the world , the gate - motor system of the elevator has been set up . the theoretical analysis and system constitute of the dtc have been carried out in this paper 本文在广泛深入了解国内外异步电动机直接转矩控制系统的研究状况的基础上，设计了适合于电梯门机的直接转矩控制系统。
Preparing for next working , simulation of the motor control system is done with software at the end of this paper , the reliability methods in design are introduced and reliability measures in elevator door drive system are described 还用软件仿真的方法对电机控制系统进行了仿真，为后续工作提供参考。在本文的最后介绍了电梯门机控制系统设计中采用的可靠性设计方法与所采用的可靠性措施。
Then the paper describes the developing process of elevator door drive system in which square wave bldcm is adopted . when presenting hardware and software of this system , in particular the paper narrates speed regulation means and torque ripple suppression strategy 本文然后详细介绍了采用方波无刷直流电机的电梯门机控制系统的研制过程，并在介绍系统的硬件和软件设计方案时，同时研究了所使用的电机的调速方法和转矩脉动抑制策略。
The gate - motor syste m of the elevator is also discussed in rough as the research background . this paper also does some work about the self - adaptation function in the dtc - system and brings forward self - adaptation - system on software according to the requests of the gate - motor system 本论文以电梯门机系统作为应用背景，对其作了大致的介绍；并按照门机系统的工作要求，对带有自学习功能的直接转矩控制系统作了探讨，并根据应用背景建立了相应的自适应系统。
Variable voltage and variable frequency ( vvvf ) inverter control technology applied by ford passenger lift extends the utilization from the elevators drive system to the door machine system , plus its matching none link lever synchronous belt type door machine structure , it results in the more smooth sensitive and secure door open and shut . the passengers feel the doubled warmth in entering into and exiting the elevators 福德乘客电梯所应用的变压变频（ vvvf ）逆变器控制技术，从电梯驱动系统延伸运用到了门机系统中，加上与之相匹配的无连杆同步带式门机结构，使电梯门的开启和关闭更加平稳、灵敏和安全，令进出电梯的乘客倍感亲切。
