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现代大都市的高层建筑,需要有性能良好的电梯来维持上下之间的交通。然而,过高的建筑都给电梯的设计带来许多难题。目前使用的电梯靠升降井顶部装的感应电机牵引着钢丝缆绳,把车厢吊挂起来,沿着井壁的轨道运行。建筑物越高,缆绳越长,因此,其弹性系数越小。这样,电机启动后,哪怕产生很小的振动都会通过缆绳传递给车厢,造成车厢的垂直振动。
High-rise buildings in modern metropolises require well-functioning elevators to maintain traffic between the upper and lower levels. However, the excessively high buildings bring many difficulties to the design of the elevator. The elevators currently in use use the induction motor mounted on the top of the elevator shaft to pull the steel wire ropes, suspend the carriages and run along the track of the borehole wall. The higher the building, the longer the cable, so the smaller the elasticity coefficient. In this way, after the motor is started, even a small amount of vibration is transmitted to the carriage through the cable, causing vertical vibration of the carriage.