Method of estimating solenoid heat accumulation and compensating for solenoid force loss
US6687636B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jan 4, 2002 |
| Grant date | Feb 3, 2004 |
| Priority date | — |
| Expiry date | Jan 27, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10F1/02
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A method of estimating solenoid heat accumulation and providing output power compensation thereof. The method is particularly well suited for compensating the drive solenoids within a player piano mechanism, or similar. A heat value is maintained for each coil whose accumulated heat is of interest. A quantity of heat is periodically removed from each heat value which corresponds to the level of thermal dissipation for the solenoid during the period. Similarly, a quantity of heat is periodically added to the heat value to account for the power being applied to the active solenoids. A gain compensation value may then be calculated from the heat value and used to temperature compensate the power being applied to the solenoids wherein force roll-off is prevented in response to solenoid use.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.