Elevator having regenerative voltage control
US8177032B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 14, 2007 |
| Grant date | May 15, 2012 |
| Priority date | — |
| Expiry date | Apr 17, 2028 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB66B1/302
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A car is suspended by suspension means and raised and lowered by a hoisting machine. Electric power supplied to a motor of the hoisting machine is controlled by an electric power converter. The electric power converter is controlled by a control apparatus. The control apparatus estimates a maximum value of a regenerative voltage at time of a regenerative operation of the hoisting machine when the car is running. When the estimated maximum value of the regenerative voltage reaches a predetermined voltage limit value, the control apparatus controls the electric power converter so as to stop an increase in estimated maximum value of the regenerative voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.