Home Technology Stair Escalator Working Principle 3D Animation

Stair Escalator Working Principle 3D Animation

We use it all the time but most people have never actually seen the inner workings of an escalator! An escalator is just a simple variation on the conveyer belt. A pair of rotating chain loops pull a series of stairs in a cons­tant cycle, moving a lot of people a short distance at a good speed.

source/image: Jared Owen

Summary: I’ve animated the inside to give you a detailed look at the steps, step chain, gears, handrail, and the motor. My favorite part is how the steps always stay level when they’re on top. video by Jared Owen:

In this video we also take a look at how escalators layouts such as side by side or the criss-cross configuration. And yes they really do have spiral escalators! Escalators are powered by constant speed alternating current motors and move at approximately 0,5 m/s which is 2 km/h using about a 100 horsepower.


Stair sscalators are made up of a set of interlocking steps, powered by an electric motor. A pair of chains looped around two pairs of gears rotate to move the steps along while a larger metal structure called a truss encases the entire mechanism to connect the floors.Each step of the escalator has two sets of wheels, which rotate along two separate tracks.