Electromagnetic valve actuation with series connected electromagnet coils
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United States of America Patent
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Nov 13, 2007
Grant Date -
Nov 10, 2005
app pub date -
May 4, 2004
filing date -
May 4, 2004
priority date (Note) -
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Abstract
Systems and methods for valve actuation use series-connected coils of upper and lower electromagnets acting as electromagnetic generators that attempt to maintain a constant magnetic flux, while their forces are essentially independent. A valve controller initiates valve actuation by reducing holding force of the holding electromagnet. As spring force begins to move an armature away from the holding electromagnet, the associated coil generates a voltage that attempts to maintain constant flux. This generated voltage causes a large increase in current that essentially transfers the flux to the other on-coming coil, which attracts and holds the armature against its associated spring force to open or close the valve. The internal voltage generated inside the two coils operates even if the coils are supplied with zero external voltage (shorted) to transfer stored energy directly between the coils. Energy may be transferred indirectly using an energy storage device.
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