VERTICAL TRACTION SYSTEM FOR ELEVATORS, WITH BUILT-IN CONTROL, SAFETY AND EMERGENCY SYSTEM

摘要

The invention relates to a vertical traction system for lifting elevators, consisting of a motor comprising a low-slip, high-torque asynchronous stator (2) and rotor (1), a driving pulley (3) which is rigidly connected to the rotor (1), an electromechanical brake (7) and a movement-detector system comprising a digital encoder (8) which is used to analyse information relating to the angular speed of the rotor (1). The torque is transmitted directly to the elevator between the motor and the pulley, without the use of gears. The inventive system is characterised in that, in the absence of voltage, the motor can be powered with direct current from batteries by varying the frequency and voltage. Using the same model, power of between 2.2 kW and 20 kW can be obtained. In the event of a breakdown, when electric current is still available, the motor is actuated until the elevator reaches a floor and the doors are opened.