Control and precision of leveling between cabin and floor

An extremely important aspect of elevator operation is the accuracy with which a given floor is reached and maintained during passenger transit. The leveling operation must be direct, i.e. the elevator must stop at a floor within the specified tolerances (+- 7mm). If a large increase in load is anticipated, the system will either reverse direction to return to the appropriate level or stop within a certain margin and begin leveling in advance.

Once the elevator has stopped and there is passenger or freight traffic , the elevator level must be maintained without any perceptible movement, and if there is any movement, it must always be towards the floor, never away. Appropriate measures must be taken in the movement control system to keep the elevator at the floor level under adverse conditions, including oscillations or an inclined path.

Micro-levelling is an optional component that fulfils this function, maintaining the level between the cabin and the floor even in adverse situations. It is a very useful component in high-end facilities (hotels), in hospital stretcher lifts, or in freight elevators and car lifts, among others. The micro-levelling function could also be carried out by the main motor-pump unit , but each time it acted it would consume a large amount of energy and cause unnecessary wear. On the other hand, micro-levelling has a very low consumption, and manages to avoid motor wear, thus increasing its durability .

Source: Elevators: Principles and Innovations. Author: A. Miravete, E. Larrodé

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