Low cost servo operated digital positioning system
US4546299A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 20, 1983 |
| Grant date | Oct 8, 1985 |
| Priority date | — |
| Expiry date | Dec 20, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05B2219/37296
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A low cost servo operated digital positioning system which utilizes a phase shift control circuit in combination with an encoder and servo circuit for driving a moveable element. The encoder generates a pair of signals A which may be equivalent to a sine signal A and a cosine signal A. The phase shift circuit multiplies signals from the encoder by a sine of a demand signal B and by a cosine of the demand signal B and produces a sine (A+B) signal and a cosine (A+B) signal. These sine and cosine shift signals are introduced into a servo circuit for control of a moveable element. By phase shifting these signals it is possible to substantially increase the overall number of positions to which a moveable member may be moved and thereby substantially increase the overall accuracy of a positioning system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.