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They are started and operated in a manner similar to modern portable alternating current electric generators, which are not used with other generators on an electric grid.
SIEMENS GENERATOR IGNITION FAULT 12 SERIES
Self-excited direct current dynamos commonly have a combination of series and parallel (shunt) field windings, which are directly supplied power by the rotor through the commutator in a regenerative manner. This allowed the growth of a much more powerful field, thus far greater output power. An important development by Wilde and Siemens was the discovery (by 1866) that a dynamo could also bootstrap itself to be self-excited, using current generated by the dynamo itself. The field coils of the stator were originally separately excited by a separate, smaller, dynamo or magneto. These were called "dynamo-electric machines" or dynamos. However, researchers found that stronger magnetic fields - and thus more power - could be produced by using electromagnets (field coils) on the stator. These were referred to as "magneto-electric machines" or magnetos. The earliest dynamos used permanent magnets to create the magnetic field. On small 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. Due to Faraday's law of induction, the motion of the wire within the magnetic field creates an electromotive force, which pushes on the electrons in the metal, creating an electric current in the wire. 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.
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The electric 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. The discovery of the dynamo principle made industrial scale electric power generation technically and economically feasible.Īfter the invention of the alternator and that alternating current can be used as a power supply, the word dynamo became associated exclusively with the ' commutated direct current electric generator', while an AC electrical generator using either slip rings or rotor magnets would become known as an alternator.Ī 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, and are actually magnetos. The invention of the dynamo principle (self-induction) was a major technological leap over the old traditional permanent magnet based DC generators. The earlier DC generators which used permanent magnets were not considered "dynamo electric machines".
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The original "dynamo principle" of Werner von Siemens referred only to the direct current generators which use exclusively the self-excitation (self-induction) principle to generate DC power. The word was coined in 1831 by Michael Faraday, who utilized his invention toward making many discoveries in electricity (Faraday discovered electrical induction) and magnetism. The word 'dynamo' (from the Greek word dynamis (δύναμις), meaning force or power) was originally another name for an electrical generator, and still has some regional usage as a replacement for the word generator.