Positioning and abnormality control device
US4757313A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 24, 1986 |
| Grant date | Jul 12, 1988 |
| Priority date | — |
| Expiry date | Jul 24, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05D3/12
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A positioning control device wherein an abnormality in a position detector is judged only by use of two position signals having differing phases emitted from the position detector for effecting position detection of a movable article without using the data of movement of the movable article to be controlled. For this purpose, direction determining means are provided which are responsive to the position signals to provide normal or reverse direction signals. A logical circuit for effecting abnormality judging of the position detector is provided in a controller for emitting a position control signal corresponding to the position signal to a control circuit for effecting position control of the movable article. When an abnormal condition occurs in the position detector, the signal aspect of the position signal emitted from the position detector is varied from that during the normal operation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.