(under subclass 201) Subject matter wherein the controlling means comprises a dynamoelectric machine having a plurality of commutators or a plurality of sets of brushes or a plurality of sets of slip rings.
(1) Note. A dynamotor (a machine which combines both motor and generator action in one magnetic field, either with two armatures or with one armature having two separate windings) is an example of a dynamoelectric machine having plural
commutators.
SEE OR SEARCH CLASS
310, Electrical Generator or Motor Structure,
127, for plural collector type dynamoelectric machines.
322, Electricity: Single Generator Systems,
53, for single generator systems wherein the generator is of the third brush type; and subclass 92 for single generator systems wherein the generator is provided with at least two sets of brushes cooperating with a single commutator and one of the sets is short-circuited.
