(under subclass 140) Subject matter in which means are provided for controlling the field circuit of the generator.
(1) Note. Providing the generator with plural, diverse or diversely arranged, field windings, or providing means for varying the active length (such as by tapping) of the field winding are included in field circuit control, when such are such as to substantially modify the operation of the electric motor.
SEE OR SEARCH THIS CLASS, SUBCLASS:
154, for this subject matter where the system includes means for the combined control of the generator field and the motor field.
156, for motor circuits under subclass 140 having field circuit control combined with other control means for the generator.
SEE OR SEARCH CLASS
322, Electricity: Single Generator Systems, 59+, for generator field circuit control in general.