Rotation detecting device and bearing having rotation detecting device
US8803510B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Dec 22, 2009 |
| Grant date | Aug 12, 2014 |
| Priority date | — |
| Expiry date | Mar 2, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D5/2452
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Provided are a rotation detecting device that highly precisely detects absolute angle with low noise, as well as a bearing assembly with such a rotation detecting device. Such a rotation detecting device includes magnetic encoders arranged coaxially with different number of magnetic poles as well as magnetic sensors that detect magnetic fields of those encoders. Each of the magnetic sensors can detect the encoders within each magnetic pole, and includes sensor elements as well as a phase detector that determines the phase of the sensor element in reference to a detected magnetic field signal and then outputs an ABZ phase signal. Such a rotation detecting device further includes a phase difference detector that determines a phase difference of the magnetic field signals in reference to an output from the phase detectors and an angle calculator that calculates the absolute angle of the encoders based on the detected phase difference.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.