ENERGY EFFICIENT VARIABLE SPEED DRIVE FOR ELEVATOR SYSTEMS

摘要

An improved system of variable speed drives that enhances the energyefficiency of an elevator system by enabling power transfer between thevariable speed drives of two or more elevators via a common DC bus. Anycombination of regenerative and non-regenerative variable speed drives may beused with the present invention. Energy storage devices may be connected tothe common DC bus further improve efficiency.