The principle used in the working of universal motors is the electromagnetism. The stator is used as the electromagnet for the creation of the magnetic field. It is the commutated one series wound motor also referred as AC series motor. The field coils of the stator are connected in series manner with the windings of the rotor via commutator. The universal motors are constructed very similar to the DC series motor but a slight modification is done to operate it on AC power.