Electricity: magnetically operated switches – magnets – and electr – Electromagnetically actuated switches – Contact-actuating means
Patent
1976-12-22
1978-06-13
Broome, Harold
Electricity: magnetically operated switches, magnets, and electr
Electromagnetically actuated switches
Contact-actuating means
335194, H01H 360
Patent
active
040952002
ABSTRACT:
A DC contactor providing increased magnetic efficiency, reduced contact bounce, and shorter arc time has a movable contact carrier bar pivotally mounted relative to a clapper armature so as to prevent tilting about its longitudinal axis and eliminate rotational bounce; a pre-loaded contact pressure spring which resiliently urges the contact carrier bar against the armature; an armature retainer spring which resiliently urges the pivoted end of the armature backward and downward against the yoke so as to displace dirt accumulated in the pivot area and prevent jamming of the armature; a generally hyperbolic magnetic pull characteristic with the knee at approximately the one-half armature travel position and the magnetic pull at the two-thirds armature travel position being approximately twice the magnetic pull at the knee to thus provide relatively high magnetic pull per ampere in the region above the knee; the magnet gap between armature and core at the point of contact engagement being less than that at the knee of the characteristic so that the force of the pre-loaded contact pressure spring tending to reduce contact bounce can be greater than the magnetic pull at the knee and also several times greater than the force of the return spring at the contact touch point, and the total return spring and contact pressure spring forces can be increased to overcome residual mmf and accelerate the contacts to open position at a higher separation rate.
REFERENCES:
patent: 2932704 (1960-04-01), Dennison et al.
Allis-Chalmers Corporation
Broome Harold
Kaiser Lee H.
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