Version 1.0, August 31, 2001, Copyright, Hugh Jack 1993-2001
· These use a coil of wire to attract a ferrous core when actuated. When the coil is deenergized a spring will pull the core back out of the coil.
· These are particularly bad electrically. There is a large actuation current and when deenergized there will be a large inductive spike.
· A very popular application for solenoids is valves. These effectively use the solenoid to drive pistons that open/close ports on a cylinder.
