Structure for and method of error compensation
US3974364A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 28, 1975 |
| Grant date | Aug 10, 1976 |
| Priority date | — |
| Expiry date | Feb 28, 1995 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01M7/022
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Structure for and method of compensating for a mechanical frequency response structure induced phase shift of an alternating electrical command signal in a closed loop control circuit so that magnitude errors independent of phase errors may be utilized in the control circuit. The structure includes a mechanical structure to be controlled having a mechanical frequency response to the cyclic command signal, an electronic frequency response circuit for producing a phase shift in the command signal substantially the same as that produced by the mechanical frequency response structure over the frequency range of the command signal, and structure for summing the error signal from the mechanical frequency response structure and from the electronic frequency response circuit to provide a magnitude error only signal, and means for providing an output signal when the selected error signal is outside of a permissible error signal range. The structure may also include switch means so that a combined magnitude and phase error signal may be substituted for the magnitude only error signal to again provide an output signal when the combined error signal is outside of a permissible error signal ran…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.