Speed or angular position electromagnetic transducer
US3942045A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 5, 1974 |
| Grant date | Mar 2, 1976 |
| Priority date | — |
| Expiry date | Jun 5, 1994 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01P3/488
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An electromagnetic angular speed or angular position transducer comprises a permanent magnet with closely spaced pole faces and a ferromagnetic core magnetically connected to the magnet and carrying a coil. The transducer cooperates with a toothed wheel the teeth of which are moved past the pole faces and the core in such a way that two magnetic circuits are completed by the teeth, one passing through the teeth and the two pole faces, and the other passing through the teeth and the core. The two magnetic circuits are in parallel with one another and the reluctance of each changes as the teeth move therepast. The circuit through the two pole faces ensures that the magnet is operated with a high leakage flux so that small changes in the reluctance cause relatively large flux changes and thus a relatively high electromotive force in the coil wound about the core.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.