Rotation sensor
US7183761B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 16, 2005 |
| Grant date | Feb 27, 2007 |
| Priority date | — |
| Expiry date | Feb 16, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D2205/775
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In a rotation sensor including a rotor 10 mounted to a rotating shaft S and having a conductive sensing unit 12 whereof the width varies in the circumferential direction; and stationary cores 31, 32, 41, 42 each including an exciting coil for forming a magnetic circuit with respect to the sensing unit of the rotor by allowing AC exciting current to flow therein, and a core body formed of magnetic material and retaining the exciting coil, and being mounted to the fixed member and disposed so as to oppose to the sensing unit of the rotor at a distance in the axial direction of the shaft, the stationary cores are disposed at two positions each having a central angle with respect to the axis of the shaft other than substantially 180°, so that the rotation sensor which is superior in mountability, is low in cost, and is superior in detection accuracy over a wider range is provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.