Dynamo Lighting for Motor Cars (Classic Reprint) - Hardcover

Inhaltsangabe

Excerpt from Dynamo Lighting for Motor Cars

The Dynam0. - Considering firstly the dynamo. This consists of five essential parts: (a) the armature, a rotating cylindrical magnet wound round with wire in which the current is generated (é) the commutator, which is suitably connected to the armature windings and rotates with them (c) the brushes, which press on the commutator and collect the current from it, passing it out to the necessary wires of the system; the field magnet, which may be either a permanent or an electro-magnet or a combination of both, its function being to give a strong magnetic field for the arma ture to rotate in; (e) the bearings and other purely mechanical details of the machine.

It should be remembered that the output of the machine depends: (i) roughly on the strength of the field; (2) on the speed with which the armature rotates; and (3) on the number of turns of wire upon the armature, although there are other factors which limit the output, such as heating, dimensions, and efficiency.

Choice of Machine - In choosing a dynamo it is well to ascertain beyond the usual facts of design, output, and weight that the bearings and commutator are generously proportioned, as these are the two weak points of lighting dynamos owing to the restricted space at the disposal of the designer. A machine should also be chosen in preference which gives its maximum working output at a low speed, and also the speed which the dynamo cuts in, or begins to generate effectively, should receive attention.

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