I work in a hotel and ride elevators upwards of 50 times a day. Never once has the bottom of the elevator been even a fraction of an inch above or below the floor where the elevator begins. Assuming there is a minimal amount of slippage in the cabling, how do the elevators move the exact same distance every single time? Is there some sort of cable/feet math going on where each floor is x amount of motor turns?
In: Engineering
Yes and Sensors. The whole elevator shaft is filled with Sensors, push buttons, etc. They are not very fancy but get the job done.
Example : Elevator is moving from 1st floor up towards 7th floor. The onboard computer calculates the time it will take, the speed, the acceleration/deceleration curve. It will also use simple push buttons to see where the elevator has reached and then make corrections if needed as well.
Modern elevators have even more complex set of sensors and circuitry involved and can do more complex calculations like the power it should use to optimize itself according to weight currently, making the ride more pleasant. When the companies install the elevator they will do calibrations to make it works perfectly for that building. It is also the reason elevators need frequent maintenances. Anything off will be dangerous, like when elevators sometime stop just a few millimeters above or below instead of being level.
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