Method for controlling elevator doors
US5587565A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 14, 1994 |
| Grant date | Dec 24, 1996 |
| Priority date | — |
| Expiry date | Apr 14, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05B2219/45242
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
An apparatus for controlling an elevator door includes a three phase AC motor that receives control signals from a controller. The signals are issued at control points along a speed versus distance profile map that represents the control points as a percentage of the total distance to be travelled by the elevator. The total distance of door travel in one direction is measured be counting the number of pulses generated by an incremental encoder during a training run wherein the door is moved between its extreme positions at a constant speed. The number of pulses counted is then normalized to represent 100% of the distance traveled. During operation, the pulses are counted whenever the elevator door is in motion and control signals are issued based upon the number of pulses counted.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.