(under subclass 720) Subject matter wherein the electric circuit has means to vary the rate of cyclic variations of the electrical energy supplied to the alternating current winding of the motor.
SEE OR SEARCH THIS CLASS, SUBCLASS:
110+, for plural diverse or diversely controlled electric motors having plural diverse or diversely controlled sources for armature circuits having different frequencies.
503, for armature circuit control of motors, generally, which includes controlling the frequency or pulsations of current supplied to the armature circuit.
700+, for synchronous motors having doubly fed circuits where synchronization or resynchronization is not involved.
704+, for synchronous motor synchronization systems.
807+, for induction motor primary circuit frequency control.
