Modem harbour crane has been continuously seeking higher economical efficiency . the stevedoring gantry crane in modern harbours plays a critical role in loading and discharge production 现代港口的装卸型门机不断地追求更高的经济指标，在港口装卸生产中起着越来越重要的作用。
These internationally advanced digital and engineering control techniques make door controlmore reliable with less noise , more smooth and more reasonable in price 由于采用了国际先进的数控及工控技术，使得门机的控制更加可靠，运行过程中的噪音很小，运行更加顺畅，而且价格合理。
In contrast with other types of door mechanism , it is smooth and reliable in movement . the - driving gear is installed under the step plate , thus occupying no room inside the bus 它与其它内摆乘客门门机相比，具有密封性能好，运行平稳、可靠，驱动装置安装在踏步板下、不占车内空间等优点。
So the writer probed into the theory and the method of monitoring cranes " station that can apply in practice base on rupture mechanics , elastic mechanics , and science of computer 为此，本文作者以断裂力学、弹性力学、计算机科学为基础，探讨了能用于工程实践的港口门机状态监测的理论与方法。
Especially " residence friend " brand ordinary type , firing prevention type a door machine and more than 20 product types of many kinds of series which our company develops , trusted deeply by the masses of users 特别是我公司开发的“宅友”牌普通型防火型卷门机多种系列二十多个产品型号，深受广大用户信赖。
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。
The actual modeling and analysis therefor leads to the discovery of stress distribution under loading , which provides strong evidence for the cause of crack of the rotating platform 通过对装卸型门机转台筒体结构的实体建模与分析，发现了其在载荷作用下的应力分布情况，为转台筒体裂纹的产生原因提供了有力的证据。
Our company has developed pmsm , the new controller of three - phase asynchronous frequency conversion motor , pmsm matching with the new controller and small elevator door operator without encoder 公司已研发出能控制永磁同步电机；三相异步变频电机最新型的控制器，与此相匹配的门机永磁同步电机及无需编码器的小型化门机。
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。
The functions of the crane transformed have great improvement , and increase the real - time display of various parameters , the diagnosis of fault etc . the designing principles of the article are effectiveness , economical , safety and reliability 改造后的门机性能大大提高，而且增加了调速控制系统的状态监测、故障诊断等功能。本文的设计原则依据：安全性，可靠性，经济性和实用性。
