Electricity: magnetically operated switches – magnets – and electr – Electromagnetically actuated switches – Retarded or delayed type
Patent
1975-03-14
1976-06-15
Stellar, George G.
Electricity: magnetically operated switches, magnets, and electr
Electromagnetically actuated switches
Retarded or delayed type
29594, 29605, 335250, H01F 502, H01F 4106, H04R 100
Patent
active
039638820
ABSTRACT:
An armature adapted for use in a voice coil or linear motor and having a conductor winding and at least one stiffening layer coaxial and coextensive with, either inside or outside, the conductor winding. The stiffening layer is formed of a multiplicity of turns of a high elastic modulus, non-magnetic fiber such as graphite. The fiber and conductor turns are all firmly bonded into a rigid, composite unitary cylinder by a substance such as epoxy impregnating the entire composite cylinder. In a preferred embodiment, the conductor turns are located between interior and exterior layers. In a preferred method for manufacturing such an armature, the composite cylinder is formed layer by layer on a rotating mandrel, impregnating each layer with epoxy resin premixed for self-hardening.
REFERENCES:
patent: 2207240 (1940-07-01), Cornwell
patent: 2713715 (1955-07-01), Jenner et al.
patent: 3160840 (1964-12-01), Liberman
patent: 3267968 (1966-08-01), Foll et al.
patent: 3792394 (1974-02-01), Bertagni
Control Data Corporation
Schwarz Edward L.
Stellar George G.
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