(under subclass 69) Subject matter wherein the armature or the field of the motor contains two windings differentially wound.
(1) Note. In most of the systems in this subclass the difference in the amount of energization of the differential windings determines the direction in which the motor operates and the speed with which it operates.
SEE OR SEARCH CLASS
318, Electricity: Motive Power Systems,
499, and the search notes thereunder for motor control by means of armature having plural opposed windings; subclass 525 and the search notes thereunder for motor control by plural opposed field windings.
