(under subclass 727) Subject matter wherein the system to supply and or control connected to the motor includes an electric circuit connected to both the primary and to the secondary winding of the motor.
SEE OR SEARCH THIS CLASS, SUBCLASS:
493, for miscellaneous motor systems having combined armature or primary control and field or secondary control of the motor.
725, for repulsion motors having primary and secondary circuits.
731, for induction motors which have a primary circuit and a secondary circuit with a voltage source in addition to the secondary induced voltage.
739, for induction motor reversing circuits with a secondary speed control circuit.
757, for induction motor braking circuits having a primary and a secondary circuit.
