With respect to this feature, what names are sometimes given to the armature and field magnet?
The object of the field magnet is to produce an intense magnetic field within which the armature revolves.
The rotating coil is usually spoken of as the armature, and the large magnet as the field magnet.
This fact can be illustrated by means of Figs.13 and 14, both of which show the armature and the poles of the field magnet.
For this reason, the field magnet is usually an electromagnet.
The field magnet consists of a ring of wrought iron with 384 pole projections.
Only here we must have just a little residual magnetism in the field magnet to start the whole process.
The field magnet was made relatively small so as to adapt the machine for a constant current.
In this arrangement the current flowing through the disc and external circuit will have no appreciable effect on the field magnet.
In other words, the eddy currents circulating in the disc will energize the field magnet.
|field magnet |
A permanent magnet used to produce a base magnetic field against which other magnetized materials react, as in the operation of electrical devices such as motors, generators, and solenoids.