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An electric motor that uses a linear solenoid as the driving force. Can be configured like a steam engine or IC engine with the solenoid replacing the cylinder and piston of these engines.
A small micro-switch operated by a cam turns on the current to the coil at the appropriate time and this generates a magnetic field that pulls/pushes the armature.
There are many different ways of arranging the coil and the armature. The above engine has what looks like a piston sliding through the centre of the coil, in this case it has a small magnet in the piston.
More normally the coil has a laminated core and the armature is attracted to the end of the solenoid.
The finished engine.....