Dynamos were the first electrical generators capable of delivering power for industry, and the foundation upon which many other later electric-power conversion devices were based, including the electric motor, the alternating-current alternator, and the rotary converter. a small electrical generator built into the hub of a bicycle wheel to power lights is called a hub dynamo, although these are invariably ac devices. the dynamo uses rotating coils of wire and magnetic fields to convert mechanical rotation into a pulsing direct electric current through faraday's law of induction. a dynamo machine consists of a stationary structure, called the stator, which provides a constant magnetic field, and a set of rotating windings called the armature which turn within that field. our main objective is to power up the electric heavy vehicles with dynamos. the biggest problem is that when the vehicles get loses its full charge while driving in an area where the current could not be taken easily or there is no sort of current in that area then you can’t able to reach your place. the other problem is that the vehicle is draining out of fuel while driving.