High sensitivity magnetic circuit
US4926122A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 8, 1988 |
| Grant date | May 15, 1990 |
| Priority date | — |
| Expiry date | Aug 8, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D5/147
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
For increased sensitivity a position sensor includes a magnetic circuit in which the stationary portion includes a permanent magnet whose width is optimally 1.5 times the tooth pitch of the exciter portion of the sensor and the magnet face proximate the exciter includes a thin layer of ferromagnetic material over which is centered a narrow magnetic sensing element, such as a magnetoresistor. The sensing element has a width typically less than the tooth width which is between 0.17 and 0.37 the tooth pitch. The needed flux density is typically available simply by appropriate magnet thickness or choice of magnet material without the need of a flux guide.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.