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...http://www.google.fr/patents/US6867512?utm_source=gb-gplus-shareBrevet US6867512 - Actuator having a permanent magnet
