Electricity: magnetically operated switches – magnets – and electr – Electromagnetically actuated switches – Automatic circuit-interrupting devices
Patent
1997-08-22
1999-02-23
Donovan, Lincoln
Electricity: magnetically operated switches, magnets, and electr
Electromagnetically actuated switches
Automatic circuit-interrupting devices
335201, 218 1, 218 22, H01H 7500
Patent
active
058748733
ABSTRACT:
An electric motor control apparatus includes an electrical current control apparatus which is operable to limit current to an electric motor. When the electric motor is a three-phase motor, three current limiting switch assemblies are provided in the electric current control apparatus. A single stack of laminations concentrates magnetic fields emanating from conductors in all three current limiting switch assemblies. Each of the current limiting switch assemblies includes two movable contacts which are mounted on contact arms. The contact arms are movable in slots in the stack of laminations. A first series of splitter plates is disposed in an array along a path of movement of the contact on the first movable contact arm and a second series of splitter plates is disposed along a path of movement of the contact on the second contact arm for each of the current limiting switch assemblies. A short circuit splitter plate conducts electrical current between the two series of splitter plates. A bypass splitter plate is connected in a bypass circuit which conducts excessive current around a motor starter to protect the motor starter.
REFERENCES:
patent: 3815059 (1974-06-01), Spoelman
patent: 4810841 (1989-03-01), Wolf
patent: 5073764 (1991-12-01), Takahashi et al.
patent: 5495083 (1996-02-01), Aymami-Pala et al.
Eckroth Kurt V.
Hetzmannseder Engelbert
Moldovan Peter K.
Piber Earl T.
Theisen Peter J.
Donovan Lincoln
Eaton Corporation
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