Speed detector using resolver
US4358722A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 27, 1980 |
| Grant date | Nov 9, 1982 |
| Priority date | — |
| Expiry date | Jun 27, 2000 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P21/22
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
In a speed detector having a fixed frequency oscillator for producing two-phase sine waves to excite two-phase exciting windings of a resolver, first and second multipliers for multiplying the output of the detecting winding of the resolver by the two-phase sine waves respectively, and a position conversion circuit and speed conversion circuit, the speed conversion circuit comprises: a third multiplier for multiplying a signal of the first multiplier by a signal of a VFO; and a fourth multiplier for multiplying a signal of the second multiplier by a signal of the VFO, the outputs of the third and fourth multipliers being applied through a comparator to a proportional integration amplifier, the output of which is used as the rotation speed signal and applied to the VFO, thereby to eliminate the necessity for provision of a countermeasure against harmonics and harmonic noise involved in the use of an integration circuit required when a resolver is used as a detector.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.