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An electrical generator that produces DC (Direct Current) with the use of a commutator is called a Dynamo. They were the first electrical generators that were capable of delivering power for industry, the foundation which other electric powered conversion devices were based upon - this includes the electric motor, the rotary converter and the alternating current alternator. These days the simpler alternator dominates large scale power generation for reliability, efficiency and cost elements.

Due to Faraday's law of induction, the motion of the wire within the magnetic field creates an electromotive force which in-turn pushes on the electrons in the metal, which then creating an electric current in the wire. On some smaller machines the constant magnetic field may be provided by one or more permanent magnets; larger machines have the constant magnetic field provided by one or more electromagnets, which are usually called field coils.

A dynamo has all the disadvantages of a mechanical commutator. Also, converting alternating to DC (Direct Current) using power rectification devices effective and usually economical.

The electric dynamo uses a series of rotating coils of wire and magnetic fields to convert mechanical rotation into a pulsing direct electric current. A dynamo machine consists of a stationary structure, called the stator, this then provides a constant magnetic field, and a set of rotating windings called the armature which then turns within that field.

At H Bowers we stock a vast range of Dynamos. If you require more hands-on advice when it comes to Dynamos speak to H Bowers on 01782 590 700 or email us at

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