Method to sense speed, direction and acceleration for a rotating shaft using a rotor with unequal tooth spacing
US5977764A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 5, 1997 |
| Grant date | Nov 2, 1999 |
| Priority date | — |
| Expiry date | Dec 5, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01P13/045
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method is provided for determining the speed and direction of a rotating shaft. A rotor is connected to the shaft. The rotor includes three circumferentially spaced teeth, the first of said teeth having a first center spacing, the second of said teeth having a second center spacing different than the center spacing of the first tooth, and the third of said teeth having a third center spacing different than the center spacing of the second tooth. The centers of each of said teeth is sensed and a signal is produced in response thereto. A first time period to reach the center of the first tooth, a second time period to reach the center of the second tooth and a third time period to reach the center of the third tooth are determined, then the speed and direction of rotation of the shaft are established.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.