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不同种类的电梯有其一定的应用范围和最适宜的拖动方式及运行速度,以满足不同的使用要求。例如:速度为1米/秒的交流双速电梯,为了能够实现自动控制,规定了建筑物层高的最小值。考虑某种特殊需要在建筑物中会出现层高很小的情况,其范围可能在2.5米～0.5米,甚至更小。在上述范围内,对于速度为1米/秒的交流双速电梯要准确停靠、平层到目的层,过去较难实现自动控制,往往采用手动以检测速度进行、停靠、平层,但人工操作既麻烦又不可靠,而且运行效率低。我在生产实践
Different types of elevators have a certain range of application and the most suitable driving method and operating speed to meet different requirements for use. For example, an AC double-speed elevator with a speed of 1m/s stipulates the minimum height of a building in order to achieve automatic control. Considering a particular need, there will be a very small height in the building, which may range from 2.5 meters to 0.5 meters or even less. In the above range, for an AC double-speed elevator with a speed of 1 m/s, it is difficult to achieve automatic control in the past by accurately docking and leveling to the destination floor. Manually to detect speed, stop, and leveling are often used manually, but manual operation is performed. It is troublesome and unreliable, and it is inefficient in operation. I am in production practice