Hall effect position sensor with flux limiter and magnetic dispersion pole piece
US5264792A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 12, 1992 |
| Grant date | Nov 23, 1993 |
| Priority date | — |
| Expiry date | Mar 12, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K17/9517
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A low cost Hall effect position sensor is disclosed which includes a Hall effect integrated circuit disposed in close proximity to a metallic target device. The Hall device is mounted on a flanged flux dispersion pole piece. The opposite end of the pole piece is attached to a rare earth or Alnico magnet. The flanged magnetic flux dispersion pole piece is designed to disperse a highly concentrated magnetic flux field from a magnet, typically an Alnico or rare earth magnet, into a low intensity magnetic flux field which is compatible with the Hall effect device as well as constant and evenly dispersed across the face of the flanged pole piece. The area of the dispersion flange face is designed so measured magnetic field in an air gap between the dispersion pole piece and a ferrous target is increased by a factor of 3 when compared to an open circuit field intensity field measurement at the surface of the dispersion pole piece. The open circuit field intensity of the sensor is below the release point of the Hall effect device. When a metallic body or ferrous target is near, the flux at the face of the dispersion pole piece is increased above the operate point of the Hall device and th…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.