(under subclass 727) Subject matter wherein the primary winding, secondary winding, or some other winding of the motor is energized through a rotary switch at least one contact of which is stationary with respect to the energized winding and another contact rotates relative thereto with some other part of the motor.
(1) Note. The rotary switch of this subclass type is usually a rotary electrical interconnection device which has a ring or disc of individual electrically insulated conducting sections around the periphery of the ring or disc and has brushes contacting the sections serially by the motion of the brushes or ring or disc.
SEE OR SEARCH THIS CLASS, SUBCLASS:
138, for space-discharge-device commutated motor systems.
244, for AC, current-commutating motor systems.
439, for motor commutation control systems generally.
725, for repulsion motor supply or control circuits.
728, for circuits to supply or control repulsion start-induction run motors and repulsion-induction motors. 733, for induction motor circuits having a commutator connected directly to the secondary winding of the motor which has a voltage source also connected to it.
734, for induction motor circuits whose secondary winding has slip rings directly connected thereto, a voltage supplied to
it, and has a separate dynamoelectric machine with a commutator forming part of the electrical system.
737, for self-cascaded double fed induction motor systems using a commutated auxiliary winding in the motor to supply a voltage to the induction motor secondary.
