Electromagnetic polar relay

Details Electromagnetic polar relay Electromagnetic polar relay

1989-09-22

1992-09-22

Picard, Leo P.

Electricity: magnetically operated switches, magnets, and electr

Electromagnetically actuated switches

Polarity-responsive

335 78, 335230, H01H 5122

Patent

active

051500906

ABSTRACT:
An electromagnetic polar relay comprising a first yoke having a main portion and first and second ends positioned at respective angles to the main portion; a second yoke, positioned to face the first yoke, having a lower end positioned to face the main portion so that magnetic reluctance between the second yoke and the main portion is larger than a magnetic reluctance between the first end of the first yoke and the main portion; an armature having a first portion movably connected to the second end of the first yoke and having a second portion movable between the first yoke and the second yoke; a coil positioned about the armature; and a permanent magnet, positioned over the main portion, having a first pole magnetically connected to the first end of the first yoke and a second pole magnetically connected to the second yoke. The higher reluctance is due to, for example, an air gap provided by a tapered edge of the second yoke. The difference in magnetic reluctance between the first and second yokes assures that an undesirably large attractive force on the armature by the second yoke is reduced in comparison with previous relay.

REFERENCES:
patent: 4727344 (1988-02-01), Koga et al.

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