(19)
(11) EP 0 279 592 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
11.10.1989 Bulletin 1989/41

(43) Date of publication A2:
24.08.1988 Bulletin 1988/34

(21) Application number: 88301162.9

(22) Date of filing: 12.02.1988
(51) International Patent Classification (IPC)4: H01H 50/30
(84) Designated Contracting States:
DE FR GB IT SE

(30) Priority: 19.02.1987 US 16425

(71) Applicant: EATON CORPORATION
Cleveland Ohio 44114 (US)

(72) Inventor:
  • Bauer, James A.
    Asheville North Carolina 28803 (US)

(74) Representative: Charlton, Peter John et al
Elkington and Fife Prospect House 8 Pembroke Road
Sevenoaks, Kent TN13 1XR
Sevenoaks, Kent TN13 1XR (GB)


(56) References cited: : 
   
       


    (54) Electromagnetic contactor with energy balanced closing system


    (57) An electromagnetic contactor or motor controller (10) in which an energy efficient bounceless contact closing operation is utilized. The energy supplied to the armature (40) of the electromagnetic closing coil (31) is such that the armature attains a predetermined velocity during its closing operation which predetermined velocity is approximately sufficient to allow the armature to move to its final fixed closed disposition where the air gap (58) between it and a permanent magnet (86) is reduced to zero at a velocity of approximately zero. One field of use is in the motor starters. An advantage lies in the fact that the present system reduces the required contact closing energy to a minimal amount.






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