In
this respect the machine therefore resembles a motor generator, and the
rotation is entirely automatic.
The armature coils are connected with a commutator in the usual way, and
the field may, of course, be excited either in shunt or in series. M.
Menges says that the residual magnetization is sufficient in his machine
to start the rotation by itself.
When the machine is to be used as a motor, it is evident that the
windings on the armature core need only be sufficient to supply current
to excite the field, or by the use of permanent magnets they may be
dispensed with altogether.
M. Menges has further designed a large number of variations on the
original type, varying the arrangement of the several parts, and
employing armatures and fields of many different types, such as are
already in use for dynamos.
In Fig. 4 a machine is represented in which the field is external to the
armature.
[Illustration: Fig. 4.]
In Fig. 5 we have a thermo-magnetic generator, which corresponds to the
disk machine in dynamos. Similar parts are indicated by the same letters
in each of these figures, so that no further detailed description is
necessary.
[Illustration: Fig. 5.]
In another modification M. Menges proposes to rotate the burners and
leave the armature and distributor at rest.
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