Electricity: magnetically operated switches – magnets – and electr – Magnets and electromagnets – Temperature-responsive type
Patent
1993-02-12
1993-11-23
Picard, Leo P.
Electricity: magnetically operated switches, magnets, and electr
Magnets and electromagnets
Temperature-responsive type
335229, H01F 4100, H01F 700, H01F 708
Patent
active
052648133
ABSTRACT:
A force motor having a cylindrical armature of ferromagnetic material is provided. An electromagnetic coil is disposed coaxially around the armature. First and second cylindrical plates are disposed on opposite ends of the armature in spaced proximity from the armature forming a respective gap having a predetermined length. A substantially tubular permanent magnet is disposed coaxially around the armature. The magnet is magnetized radially with respect to the longitudinal axis and provides a pair of oppositely directed magnetic flux paths. A current source energizes the electromagnetic coil, which produces an electromagnetic flux path directed through the gaps and the armature to cause the armature to move. Advantageously, temperature compensators are provided to differentially expand and contract, with respect to the cylindrical plates, in response to a varying temperature of the force motor. The differential expansion of the temperature compensators urges the cylindrical plates toward one another to reduce the predetermined length of the gaps.
REFERENCES:
patent: 3740594 (1973-06-01), Casey
patent: 3947794 (1976-03-01), Newcomb
patent: 4705219 (1987-11-01), Pagdin
patent: 4793372 (1988-12-01), Gauthier
Barrera Raymond
Caterpillar Inc.
Masterson David M.
Picard Leo P.
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