Abstract: The presented paper is an electromagnetic piston that works on the basis of magnetic attraction and repulsion. The piston consists of an electromagnet placed between two permanent magnets of same polarity. The permanent magnets, being of same polarity, are held apart due to repulsive forces. When the electromagnet is energized, the magnets are attracted and hence move towards each other. When the excitation is removed, the electromagnet reverts to its original state, and hence the permanent magnets repel and move away from each other. When the electromagnet is energized and de-energized alternatively, the magnets move towards and away from each other, contributing to the reciprocating movement of the piston.

Keywords: Electromagnet, engine, piston, repulsion.