DC solenoid actuator circuits
US4642725A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 3, 1985 |
| Grant date | Feb 10, 1987 |
| Priority date | — |
| Expiry date | Oct 3, 2005 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F7/1838
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
This invention relates to DC solenoid actuator circuits. A DC solenoid winding located to act on an armature, is connected across a rectifier connected to an AC supply. A capacitor is provided across the winding so that the initial voltage applied to the solenoid winding is greater than the average actuating voltage. One terminal of the rectifier is connected to the AC supply via a switch which can either include in that circuit a capacitor or shunt that capacitor. The switch is mechanically linked to the armature of the solenoid winding so that at a predetermined point during the stroke of the armature the switch is operated to include the capacitor in the circuit so as to lower the actuating voltage for the solenoid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.