Power supply for elevator systems having variable speed drives
January 30, 2024. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesAlternating current motor control system with emergency control responsive to failure of power supply Rotary elevator car door coupling Reserve power system Elevator power management system having power storage apparatus maintaining a particular charge in accordance with time of day Controller scheduling constant current charging of a rechargeable power source of an elevator system Elevator control apparatus controlling charging of a power source with regenerative power Power supply for ac elevator Super-capacitor energy storage unit for elevator installations Emergency power supply device for lift systems Patent #: 6938733 InventorsAssigneeApplicationNo. 10769527 filed on 01/30/2004US Classes:187/290, With auxiliary supply of electricity187/297Limited to power source (i.e., motor) utilizing D.C. powerExaminersPrimary: Salata, JonathanAttorney, Agent or FirmInternational ClassB66B 1/06AbstractAn improved system of variable speed drives that enhances the energy efficiency of an elevator system by enabling power transfer between the variable speed drives of two or more elevators via a common DC bus. Any combination of regenerative and non-regenerative variable speed drives may be used with the present invention. Energy storage devices may be connected to the common DC bus further improve efficiency. | |
