Rotational-angle detection device and electric power-steering device provided with rotational-angle detection device
US9475520B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 24, 2011 |
| Grant date | Oct 25, 2016 |
| Priority date | — |
| Expiry date | Nov 24, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D3/02
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
When a shaft misalignment detection part detects occurrence of a shaft misalignment that is a misalignment in a relative position in a radial direction of a rotary shaft between a magnet part and a sensor part, the shaft misalignment detection part outputs a shaft misalignment determination flag to a correction part and a control change instruction part. The correction part calculates a motor rotational angle so as to reduce a detection error caused by the shaft misalignment. The control change instruction part outputs instructions of changing calculation methods so that influence by the detection error decreases to an assist torque setting part and an assist current instruction part.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.