(57) A rotary mechanism for operating switchgear has a fixed core (51), a rotary core
(52) rotatable within a rotation range limited by end positions corresponding to switchgear
open and closed positions, a spring unit for accumulating resilience when the rotary
core (52) is rotated to any one of the end positions, a permanent magnet (5) for generating
attraction greater than the resilience of the spring unit, to hold the rotary core
(52) at any one of the end positions, and an electromagnetic coil (4A,4B) for forming,
when the rotary core is at one of the end positions, a magnetic path to weaken the
attraction of the permanent magnet lower than the resilience of the spring unit so
that the rotary core (52) may be rotated to the other end position where the permanent
magnet (5) and electromagnetic coil form magnetic paths oriented in the same direction.
This rotary operating mechanism has a wide application range, a bistable characteristics,
a permanent magnet attraction switching function, and a long switching stroke.
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