Reciprocating to rotary motion by electromagnetic and spring forces: an analytical investigation with differential equation

Abstract

The reciprocating motion of a typical piston is replicated using electromagnetic and spring forces. Electromagnets producing alternating magnetic fields are used to give a reciprocating sliding motion to a permanent magnet, the frequency of the AC current may be varied by modifying the oscillator used. A potentiometer is used to control the magnitude of the AC current, which varies the amplitude and speed of the reciprocating motion. A spring is used for providing an additional amount of force. The oscillatory motion of the piston in turn can be used to drive a crank mechanism and thus produce rotational motion.