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电梯控制系统设计r
四正文引言r
电梯是随着高层建筑的兴建而发展起来的一种垂直运输工具多层厂房和多层仓库需要有货梯高层住宅需要有住宅梯百货大楼和宾馆需要有客梯自动扶梯……在现代社会电梯已像汽车轮船一样成为人类不可缺少的交通运输工具据统计美国每天乘电梯的人次多于乘载其它交通工具的人数当今世界电梯的使用量已成为衡量现代化程度的标志之一追溯电梯这种升降设备的历史据说它起源于公元前236年的古希腊当时有个叫阿基米德的人设计出人力驱动的卷筒式卷扬机1858年以蒸汽机为动力的客梯在美国出现继而有在英国出现水压梯1889年美国的奥梯斯电梯公司首先使用电动机作为电梯动力这才出现名副其实的电梯并使电梯趋于实用化1900年还出现了第一台自动扶梯1949年出现了群控电梯首批46台群控电梯在纽约的联合国大厦被使用1955年出现了小型计算机真空管控制电梯1962r