Control method
US6457457B1 · kind B1 · utility
Assignees
Inventor
Key dates
| Filing date | Sep 16, 1998 |
| Grant date | Oct 1, 2002 |
| Priority date | — |
| Expiry date | Sep 16, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F7/18
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A method of controlling an electromagnetically operated actuator for a valve arrangement. The valve arrangement is responsive to an actuator armature. The actuator has a winding and is preferably of the two-stage lift type. The method includes applying a first, low voltage to the actuator, using a first voltage source, to generate a relatively low rate of current increase through the actuator winding, thereby to impart a force to the armature to cause the armature to move relatively slowly from a rest position to a first intermediate position. The method also includes applying a second, higher voltage to the actuator, using a second voltage source coupled to the first voltage source through a regeneration path, to generate a relatively high rate of current increase through the actuator winding, thereby to impart a force to the armature to cause the armature to move relatively quickly from the first intermediate position to a second position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.