Electromagnet drop time detection method
US4481473A · kind A · utility
4Cited by
3References
6Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 13, 1981 |
| Grant date | Nov 6, 1984 |
| Priority date | — |
| Expiry date | Nov 13, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R31/3278
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Electromagnetic actuator release characteristics are evaluated by sampling at high frequency the voltage waveform resulting when the magnet coil is deenergized. The samples are converted to a digitally coded form and stored in sequence. The stored values are then examined in reverse sequence to identify the first examined sampling interval in which the sample value exceeds a predetermined characteristic release level for the electromagnetic actuator. Finally, the release time is determined by calculating the time after energization corresponding to the sampling interval that has been identified as the release interval.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.