Energy efficient elevator system
US7374020B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 27, 2004 |
| Grant date | May 20, 2008 |
| Priority date | — |
| Expiry date | Aug 8, 2025 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB66B1/28
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
The invention is directed to an apparatus and methods for enhancing the energy efficiency of a variable speed drive (VSD) used to control an elevator by disconnecting the VSD from the AC power supply grid when the elevator is idle and reconnecting the VSD when the elevator becomes active. One embodiment of the invention includes an alternating current power supply grid, one or more variable speed drives, contactors connected between the alternating current power supply grid and the variable speed drive(s) that are used to connect or disconnect the variable speed drive(s) from the alternating current power supply grid, and, a control system that controls the contactors. The contactors may include a coil which is powered by the control system to either connect or disconnect the VSDs and the AC power supply grid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.