Hello,
Could someone explain how a latching relay operates. I understand the a DC
type uses a positive pulse and a negitive pulse. I not sure how that would
work or how the wiring would look. I would also like to know how an AC type
would work. I assume that it works by applying current to the proper coil,
or the proper end of it. Is there just a single coil in both types or what?
Thanks
My understanding, as described to me by one of my former
acquaintances who was an aircraft electrical systems guy at Boeing...
What you refer to is also, sometimes, called a 'balanced force'
relay, and they are frequently used in aircraft and military
applications. They have two coils, and two small permanent magnets.
When at rest, the relay's armature is held in said resting
position by one of the permanent magnets. When current is applied to one
of the coils, the pull is enough to overcome the opposite permanent
magnet, and to bring the relay's armature to the opposite state.
The permanent magnets help to insure that exactly the same force
is applied to the relay armature no matter which coil is energized. They
also serve to reduce or eliminate contact bounce, thus allowing the
relay to operate reliably under high-vibration conditions.
What you describe (a single coil using differing polarities for
each direction) could probably be done (heck, already has been done I
think) as well.
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