High resolution one and two dimensional position indicating apparatus with plural windings having a common connection and separately energized by signals of different phase
US5072179A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 12, 1990 |
| Grant date | Dec 10, 1991 |
| Priority date | — |
| Expiry date | Jun 12, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D5/2013
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Position indicating apparatus that allows position detection with windings provided on only one of two members and an output signal in which the position of one of the members relative to the other member is directly encoded in the phase of the output signal. A first member has a plurality of spaced ferromagnetic protuberances. A second member, movable with respect to the first member, contains at least first, second and third poles located in proximity to the protuberances and spans 360 spatial degrees. Each pole contains a winding with one terminal of each winding connected to a common point. The windings are driven at a fundamental carrier frequency with individual signals of equal amplitude but different temporal phases that span 360 temporal degrees. Circuit means detect the phase of the resulting carrier signal at the common point, which phase is linearly representative of position. Embodiments are disclosed for dimensional linear, one dimensional rotary, two dimensional planar and two dimensional cylindrical motion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.