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An escalator is a type of vertical transportation device used to move people between different floors of a building. It consists of a continuously moving staircase driven by an electric motor, designed to carry passengers safely and efficiently from one level to another. Escalators are widely installed in public buildings such as shopping malls, airports, railway stations, hotels, hospitals, and commercial complexes where a large number of people need to move quickly between floors. Unlike elevators, which carry people in a closed cabin, escalators allow continuous passenger movement without waiting time, making them suitable for areas with heavy pedestrian traffic. Structurally, an escalator consists of several important components that work together to ensure smooth and safe operation. The main components include the truss, steps, step chain, drive motor, handrail system, landing platforms, and control system. The truss is the structural framework of the escalator and supports all the internal parts. It is usually made of steel and extends between the upper and lower landing platforms. The steps are the moving stair-like elements on which passengers stand. These steps are connected by a step chain that moves them in a continuous loop. The working principle of an escalator is based on a motor-driven chain system. An electric motor located ________ ____ ___ _________ __________ ______ _____ ____ ____.
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