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The Field Magnet

المؤلف:  GEORGE A. HOADLEY

المصدر:  ESSENTIALS OF PHYSICS

الجزء والصفحة:  p-407

2025-12-14

425

There are several methods employed to produce the magnetic field, and these determine the classes to which dynamos belong.

The frame of a dynamo may take any one of a number of forms. In Fig. 2, which shows the frame of a two-pole machine, the poles of the electromagnet are marked N and S. C and C' are the cores upon which the magnetizing coils are wound, and Y is the yoke, which is of iron or steel, and forms a path for the lines of force between the magnet cores. The core of the armature is marked c, and the air gap in which the lines of force are cut by the conductors is in the space between the core, c, and the face of either pole.

Dynamos having more than one pair of poles are called multipolar. Those having two pairs are four-pole, those with three pairs are six-pole, and so on. The number of poles is regulated by the use to which the machine is put.