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US 6,787,946 B2Granted
Actuator having a permanent magnet
AssigneeSiemens VDO Automotive Corporation
InventorsGilles Delaire, Frederic Gagnon
Life of this patent
Estimating the term…
Abstract
A solenoid for use in a valve such as an exhaust gas recirculation valve for a motor vehicle. The solenoid includes a housing having a coil for generating a first magnetic field. An armature is slidably mounted in the housing. The solenoid further includes a permanent magnet having a second magnetic field, wherein the magnet is located adjacent the armature. In addition, a stator is affixed in the housing for cooperation with the armature and the magnet to form a third magnetic field.
Claims8
A solenoid, comprising:
- a housing having a coil for generating a first magnetic field;
- an armature slidably mounted in said housing;
- a permanent magnet having a second magnetic field, wherein said magnet is located adjacent said armature;
- and
- a stator affixed in said housing for cooperation with said armature and said magnet to form a third magnetic field, wherein said stator has a frusto-conical configuration having a tip and said third magnetic field is concentrated around said tip.
2 more elements
A valve, comprising:
- a housing having first and second ports and a coil for generating a first magnetic field;
- an armature slidably mounted in said housing, said armature having a valve head for closing and opening said first port;
- a permanent magnet having a second magnetic field, wherein said magnet is located adjacent said armature;
- a stator affixed in said housing for cooperation with said armature and said magnet to form a third magnetic field around said stator, wherein said stator has a frusto-conical configuration having a tip and said third magnetic field is concentrated around said tip.
1 more element
Dependencies are inferred from the claim text.