Angle detection apparatus computing phase differences between first and second phase angles
US7123175B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Aug 17, 2005 |
| Grant date | Oct 17, 2006 |
| Priority date | — |
| Expiry date | Aug 17, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M1/485
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A resolver use angle detection IC subjected to a phase lock operation so as to follow not an angle θ(t) for detection, but a phase angle ωot±θ(t) having an offset of a frequency ωot in the phase lock units. For this reason, when the excitation frequency ωot is set sufficiently high with respect to the frequency of the angle θ(t), the phase angle ωot±θ to be followed in the phase lock units will not become zero. For this reason, an angle having a high precision can be found in real time regardless of the configuration not including the conventional apparatus in which the configuration is complex and the power consumption is large like a bipolar VCO and an up/down type counter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.