AC motors are increasingly replacing DC motors in electric vehicles. The big advantage of AC motors compared to DC motors is that no need to supply current to the rotating rotor, as it is excited by the rotating magnetic field. The magnetic field forces act on the armature and drive it to rotate due to the effect of the induced current. AC motors are categorized as asynchronous motors and synchronous motors, depending on whether the rotor rotates at a different speed or in synchrony with the rotating field of the stator.