Rotation angle detection device and rotation angle detection method
US12203750B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 24, 2023 |
| Grant date | Jan 21, 2025 |
| Priority date | — |
| Expiry date | Jun 30, 2043 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D5/24476
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A rotation angle detection device includes a current meter that measures a current flowing in a direct current motor; a filter that extracts a ripple component from the current; a ripple detector that detects a ripple from a signal that has passed through the filter; and a rotation angle detector that detects a rotation angle of the direct current motor based on the number of ripples. The rotation angle detector measures an observation period based on consecutive ripples, calculates an estimation period between the consecutive ripples based on the observation period, determines whether the observation period is within a normal range based on the estimation period and the observation period, and in response to determining that the observation period is within the normal range and an immediately-previous observation period is outside the normal range, calculates a number of correction ripples CRN so as to correct the number of the ripples.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.