Patent ID: 8622177
Filing Date: 2014-01-07
Classification: B66B

Abstract:
1. A control system for an elevator apparatus comprising a single car without counterweight, which is movable between a lower level or floor and an upper level or floor, and driven by an a.c. reversible electrical machine with the energy provided by a source, and controlled through a first inverter; the system comprising energy storage means coupled to said first inverter and controlled through a second inverter, and adapted to store energy generated by said electrical machine and energy coming from the source and optionally not used by said machine, as well as to deliver the stored energy towards said machine when the latter requires a power higher than a threshold; the system being arranged to automatically cause, during normal operation of the elevator apparatus, a lifting of the car up to the upper floor when preset conditions occur in a time interval of inactivity of the elevator apparatus.