Kone Corporation

Sievin Jalkine Oy

Markku Jokinen

Janne Mikkonen

Tarvo Viita-aho

Tapani Talonen

Matti Mustonen

Tapio Siironen

Ville Myyryläinen

Alessio Calcagno

A method for defining a tension of a belt of an automatic door includes exciting a resonant frequency of the belt to cause a vibration of the belt, obtaining motion data representing motion of an electric motor that moves the belt, defining vibration information representing the vibration of the belt based on the obtained motion data, and defining the tension of the belt based on the defined vibration in-formation and predefined characteristics of the belt. The method may be performed by a door drive unit and a computer program for defining a tension of a belt of an automatic door.

Method and a door drive unit for defining tension of a belt of an automatic door

The method includes loading and/or unloading the car, determining whether the car doors are fully closed or not fully open, measuring a total actual axial mass F&#x3a3;act hanging from the traction sheave, determining a stalling limit total minimum axial mass F&#x3a3;min, checking reopening of the car doors, whereby if the car doors are reopened, then return to beginning, else, continue, permitting starting of elevator, comparing the total actual axial mass with the stalling limit total minimum axial mass, whereby if the total actual axial mass is equal to or greater than the stalling limit total minimum axial mass, then permit normal run of the elevator car to the next landing, else, stop the elevator.

Method for controlling an elevator

Growing community of inventors

Helsinki, Finland

Markku Jokinen