(19)
(11) EP 1 049 114 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
21.11.2001 Bulletin 2001/47

(43) Date of publication A2:
02.11.2000 Bulletin 2000/44

(21) Application number: 00103929.6

(22) Date of filing: 25.02.2000
(51) International Patent Classification (IPC)7: H01F 7/18, F01L 9/04
(84) Designated Contracting States:
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
Designated Extension States:
AL LT LV MK RO SI

(30) Priority: 27.04.1999 US 300343

(71) Applicant: Siemens Automotive Corporation
Auburn Hills, Michigan 48326-2980 (US)

(72) Inventor:
  • Weber, Robert E.
    Newport News, VA 23608 (US)

(74) Representative: Allen, Derek 
Siemens Shared Services Limited, Intellectual Property Department, Siemens House, Oldbury
Bracknell, Berkshire RG12 8FZ
Bracknell, Berkshire RG12 8FZ (GB)

   


(54) A method for controlling an armature of a high speed electromagnetic actuator


(57) A method is provided to control velocity of an armature of an electromagnetic actuator as the armature moves from a first position towards a second position. The electromagnetic actuator includes an electromagnet having a coil and a stator core at the second position. The method includes permitting the armature to move towards the stator core. Magnetic flux in a magnetic circuit created by the armature and electromagnet is determined when the armature is moving toward the stator core. The determined magnetic flux is used as a feedback variable to control energy to the coil so as to control a velocity of the armature as the armature moves towards the stator core.






Search report