Hydraulic elevators on the presence of piston down the elevator cabins and there is a special oil bottom to raise and lower the elevator
The height of the oil and thus the height of the cab is controlled by an oil pump operated by three phase induction motor.
Usually the hydraulic elevator is used up to 11 m / s (low speed for the speed of the elevator with the rope you are used to)
In order to achieve economic benefit, the height of the elevator should not exceed 255 meters (also a very small height for the elevator with ropes up to 20 or more)
