Demodulation circuit for AC motor current spectral analysis
US4978909A · kind A · utility
35Cited by
8References
18Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 31, 1989 |
| Grant date | Dec 18, 1990 |
| Priority date | — |
| Expiry date | Aug 31, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R23/16
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A motor current analysis method for the remote, noninvasive inspection of electric motor-operated systems. Synchronous amplitude demodulation and phase demodulation circuits are used singly and in combination along with a frequency analyzer to produce improved spectral analysis of load-induced frequencies present in the electric current flowing in a motor-driven system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.