Electricity: magnetically operated switches – magnets – and electr – Magnets and electromagnets – With magneto-mechanical motive device
Patent
1993-01-06
1996-11-26
Brown, Brian W.
Electricity: magnetically operated switches, magnets, and electr
Magnets and electromagnets
With magneto-mechanical motive device
H01F 710
Patent
active
055789790
ABSTRACT:
An improved electromagnetic apparatus includes a core and an armature which is movable relative to the core. A shading ring is connected with the core to provide magnetic flux which is out of phase with magnetic flux from the core. The shading ring includes a base formed a first metal and a layer of a second metal clad to the base. The first metal forming the base work hardens and has a greater resistance to fatigue failure induced by vibration than the second metal of the layer which is clad to the base. However, the second metal forming the clad layer has a greater electrical conductivity than the first metal of the base. The base may be formed of aluminum and the layer of metal clad to the base may be formed of copper. The layer of copper may be clad to the base by an extrusion process.
REFERENCES:
patent: 2053129 (1936-09-01), Chapman
patent: 3283275 (1966-11-01), Rider, Jr.
patent: 4030056 (1977-06-01), Patz
patent: 4525694 (1985-06-01), Dennison et al.
patent: 4760364 (1988-07-01), Ostby
CRC, Handbook of Chemistry & Physics, 1992, pp. 15-30, 31: Brazing Filler Metals (Solders).
Adams David M.
Hastings Jerome K.
Barrena Raymond
Brown Brian W.
Eaton Corporation
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